Add (partial) support for IoT XEPs

That is XEP-0323, -0324, -0325, and -0347.

SMACK-727.

documentation/developer/integrationtest.md

@@ -55,6 +55,8 @@ debug=true
 | accountOnePassword   | Password of the first XMPP account        |
 | accountTwoUsername   | Username of the second XMPP account       |
 | accountTwoPassword   | Password of the second XMPP account       |
+| accountThreeUsername | Username of the third XMPP account        |
+| accountThreePassword | Password of the third XMPP account        |
 | debug                | 'true' to enable debug output             |
 | enabledTests         | List of enabled tests                     |
 | disabledTests        | List of disabled tests                    |

documentation/extensions/index.md

@@ -1,4 +1,4 @@
-Smack Extensions User Manual
+smackSmack Extensions User Manual
 ============================
 
 The XMPP protocol includes a base protocol and many optional extensions
@@ -77,8 +77,12 @@ Experimental Smack Extensions and currently supported XEPs of smack-experimental
 | Name                                        | XEP                                                      | Description |
 |---------------------------------------------|----------------------------------------------------------|----------------------------------------------------------------------------------------------------------|
 | Message Carbons                             | [XEP-0280](http://xmpp.org/extensions/xep-0280.html) | Keep all IM clients for a user engaged in a conversation, by carbon-copy outbound messages to all interested resources.
-| [HTTP over XMPP transport](hoxt.md)       | [XEP-0332](http://xmpp.org/extensions/xep-0332.html) | Allows to transport HTTP communication over XMPP peer-to-peer networks. |
+| [Internet of Things - Sensor Data](iot.md)  | [XEP-0323](http://xmpp.org/extensions/xep-0323.html) | Sensor data interchange over XMPP. |
+| [Internet of Things - Provisioning](iot.md) | [XEP-0324](http://xmpp.org/extensions/xep-0324.html) | Provisioning, access rights and user priviliges for the Internet of Things. |
+| [Internet of Things - Control](iot.md)      | [XEP-0325](http://xmpp.org/extensions/xep-0325.html) | Describes how to control devices or actuators in an XMPP-based sensor netowrk. |
+| [HTTP over XMPP transport](hoxt.md)         | [XEP-0332](http://xmpp.org/extensions/xep-0332.html) | Allows to transport HTTP communication over XMPP peer-to-peer networks. |
 | JSON Containers                             | [XEP-0335](http://xmpp.org/extensions/xep-0335.html) | Encapsulation of JSON data within XMPP Stanzas. |
+| [Internet of Things - Discovery](iot.md)    | [XEP-0347](http://xmpp.org/extensions/xep-0347.html) | Describes how Things can be installed and discovered by their owners. |
 | Google GCM JSON payload                     | n/a                                                  | Semantically the same as XEP-0335: JSON Containers |
 | Client State Indication                     | [XEP-0352](http://xmpp.org/extensions/xep-0352.html) | A way for the client to indicate its active/inactive state. |
 

documentation/extensions/iot.md

@@ -0,0 +1,116 @@
+Internet of Things (XEP-0323, -0324, -0325, -0347)
+==================================================
+
+The Internet of Things (IoT) XEPs are an experimental open standard how XMPP can be used for IoT. They currently consists of
+- XEP-0323 Sensor Data
+- XEP-0324 Provisioning
+- XEP-0325 Control
+- XEP-0326 Concentrators
+- XEP-0347 Discovery
+
+Smack only supports a subset of the functionality described by the XEPs!
+
+Thing Builder
+-------------
+
+The `org.jivesoftware.smackx.iot.Thing` class acts as basic entity representing a single "Thing" which can used to retrieve data from or to send control commands to. `Things` are constructed using a builder API.
+
+
+Reading data from things
+------------------------
+
+For example, we can build a Thing which provides the current temperature with
+
+```java
+Thing dataThing = Thing.builder().setKey(key).setSerialNumber(sn).setMomentaryReadOutRequestHandler(new ThingMomentaryReadOutRequest() {
+    @Override
+    public void momentaryReadOutRequest(ThingMomentaryReadOutResult callback) {
+        int temp = getCurrentTemperature();
+        IoTDataField.IntField field = new IntField("temperature", temp);
+        callback.momentaryReadOut(Collections.singletonList(field));
+    }
+}).build();
+```
+
+While not strictly required, most things are identified via a key and serial number. We also build the thing with a "momentary read out request handler" which when triggered, retrieved the current temperature and reports it back to the requestor.
+
+After the `Thing` is build, it needs to be made available so that other entities within the federated XMPP network can use it. Right now, we only intall the Thing in the `IoTDataManager`, which means the thing will act on read out requests but not be managed by a provisioning server.
+
+```java
+IoTDataManager iotDataManager = IoTDataManager.getInstanceFor(connection);
+iotDataManager.installThing(thing);
+```
+
+The data can be read out also by using the `IoTDataManager`:
+
+```java
+FullJid jid = …
+List<IoTFieldsExtension> values = iotDataManager.requestMomentaryValuesReadOut(jid);
+```
+
+Now you have to unwrap the `IoTDataField` instances from the `IoTFieldsExtension`. Note that Smack currently only supports a subset of the specified data types.
+
+Controlling a thing
+-------------------
+
+Things can also be controlled, e.g. to turn on a light. Let's create thing which can be used to turn the light on and off.
+
+```java
+Thing controlThing = Thing.builder().setKey(key).setSerialNumber(sn).setControlRequestHandler(new ThingControlRequest() {
+    @Override
+    public void processRequest(Jid from, Collection<SetData> setData) throws XMPPErrorException {
+        for (final SetData data : setData) {
+            if (!data.getName().equals("light")) continue;
+            if (!(data instanceof SetBoolData)) continue;
+            SetBoolData boolData = (SetBoolData) data;
+            setLight(boolData.getBooleanValue());
+        }
+    }
+}).build();
+```
+
+No we have to install this thing into the `IoTControlManager`:
+
+```java
+IoTControlManager iotControlManager = IoTControlManager.getInstanceFor(connection);
+iotControlManager.installThing(thing);
+```
+
+The `IoTControlManager` can also be used to control a thing:
+
+```java
+FullJid jid = …
+SetData setData = new SetBoolData("light", true);
+iotControlManager.setUsingIq(jid, setData);
+```
+
+Smack currently only supports a subset of the possible data types for set data.
+
+Discovery
+---------
+
+You may wondered how a full JIDs of things can be determined. One approach is using the discovery mechanisms specified in XEP-0347. Smack provides the `IoTDiscoveryManager` as API for this.
+
+For example, instead of just installing the previous things in the `IoTDataManager` and/or `IoTControlManager`, we could also use the `IoTDiscoveryManger` to register the thing with a registry. Doing thing also installs the thing in the `IoTDataManager` and the `IoTControlManager`.
+
+```java
+IoTDiscoveryManager iotDiscoveryManager = IoTDiscoveryManager.getInstanceFor(connection);
+iotDiscovyerManager.registerThing(thing);
+```
+
+The registry will now make the thing known to a broader audience, and available for a potential owner.
+
+The `IoTDiscoveryManager` can also be used to claim, disown, remove and unregister a thing.
+
+Provisioning
+------------
+
+Things can usually only be used by other things if they are friends. Since a thing normally can't decide on its own if an incoming friendship request should be granted or not, we can delegate this decission to a provisioning service. Smack provides the `IoTProvisinoManager` to deal with friendship and provisioning.
+
+For example, if you want to befriend another thing:
+
+```java
+BareJid jid = …
+IoTProvisioningManager iotProvisioningManager = IoTProvisioningManager.getInstanceFor(connection);
+iotProvisioningManager.sendFriendshipRequest(jid);
+```

smack-core/src/main/java/org/jivesoftware/smack/ReconnectionManager.java

@@ -238,7 +238,11 @@ public final class ReconnectionManager {
                     // Makes a reconnection attempt
                     try {
                         if (isReconnectionPossible(connection)) {
-                            connection.connect();
+                            try {
+                                connection.connect();
+                            } catch (SmackException.AlreadyConnectedException e) {
+                                LOGGER.log(Level.FINER, "Connection was already connected on reconnection attempt", e);
+                            }
                         }
                         // TODO Starting with Smack 4.2, connect() will no
                         // longer login automatically. So change this and the

smack-core/src/main/java/org/jivesoftware/smack/packet/EmptyResultIQ.java

@@ -25,13 +25,7 @@ public class EmptyResultIQ extends IQ {
 
     public EmptyResultIQ(IQ request) {
         this();
-        if (!(request.getType() == Type.get || request.getType() == Type.set)) {
+        initialzeAsResultFor(request);
-            throw new IllegalArgumentException(
-                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML());
-        }
-        setStanzaId(request.getStanzaId());
-        setFrom(request.getTo());
-        setTo(request.getFrom());
     }
 
     @Override

smack-core/src/main/java/org/jivesoftware/smack/packet/IQ.java

@@ -215,6 +215,17 @@ public abstract class IQ extends Stanza {
      */
     protected abstract IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml);
 
+    protected final void initialzeAsResultFor(IQ request) {
+        if (!(request.getType() == Type.get || request.getType() == Type.set)) {
+            throw new IllegalArgumentException(
+                    "IQ must be of type 'set' or 'get'. Original IQ: " + request.toXML());
+        }
+        setStanzaId(request.getStanzaId());
+        setFrom(request.getTo());
+        setTo(request.getFrom());
+        setType(Type.result);
+    }
+
     /**
      * Convenience method to create a new empty {@link Type#result IQ.Type.result}
      * IQ based on a {@link Type#get IQ.Type.get} or {@link Type#set IQ.Type.set}
@@ -289,9 +300,7 @@ public abstract class IQ extends Stanza {
      * @throws IllegalArgumentException if the IQ stanza(/packet) does not have a type of
      *      {@link Type#get IQ.Type.get} or {@link Type#set IQ.Type.set}.
      * @return a new {@link Type#error IQ.Type.error} IQ based on the originating IQ.
-     * @deprecated use {@link #createErrorResponse(IQ, org.jivesoftware.smack.packet.XMPPError.Builder)} instead.
      */
-    @Deprecated
     public static ErrorIQ createErrorResponse(final IQ request, final XMPPError error) {
         return createErrorResponse(request, XMPPError.getBuilder(error));
     }

smack-core/src/main/java/org/jivesoftware/smack/packet/Presence.java

@@ -73,6 +73,8 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
      * @param type the type.
      */
     public Presence(Type type) {
+        // Ensure that the stanza ID is set by calling super().
+        super();
         setType(type);
     }
 
@@ -85,6 +87,8 @@ public final class Presence extends Stanza implements TypedCloneable<Presence> {
      * @param mode the mode type for this presence update.
      */
     public Presence(Type type, String status, int priority, Mode mode) {
+        // Ensure that the stanza ID is set by calling super().
+        super();
         setType(type);
         setStatus(status);
         setPriority(priority);

smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java

@@ -23,6 +23,7 @@ import java.text.ParseException;
 import java.util.Date;
 import java.util.Locale;
 
+import org.jivesoftware.smack.SmackException;
 import org.jxmpp.jid.EntityBareJid;
 import org.jxmpp.jid.Jid;
 import org.jxmpp.jid.impl.JidCreate;
@@ -122,6 +123,14 @@ public class ParserUtils {
         }
     }
 
+    public static int getIntegerAttributeOrThrow(XmlPullParser parser, String name, String throwMessage) throws SmackException {
+        Integer res = getIntegerAttribute(parser, name);
+        if (res == null) {
+            throw new SmackException(throwMessage);
+        }
+        return res;
+    }
+
     public static Integer getIntegerAttribute(XmlPullParser parser, String name) {
         String valueString = parser.getAttributeValue("", name);
         if (valueString == null)

smack-core/src/main/java/org/jivesoftware/smack/util/XmlStringBuilder.java

@@ -238,6 +238,10 @@ public class XmlStringBuilder implements Appendable, CharSequence {
         return this;
     }
 
+    public XmlStringBuilder attribute(String name, boolean bool) {
+        return attribute(name, Boolean.toString(bool));
+    }
+
     /**
      * Add a new attribute to this builder, with the {@link java.util.Date} instance as its value,
      * which will get formated with {@link XmppDateTime#formatXEP0082Date(Date)}.

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/IoTException.java

@@ -0,0 +1,28 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot;
+
+import org.jivesoftware.smack.SmackException;
+
+public class IoTException extends SmackException {
+
+    /**
+     * 
+     */
+    private static final long serialVersionUID = 1L;
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/IoTManager.java

@@ -0,0 +1,42 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot;
+
+import java.util.Map;
+import java.util.WeakHashMap;
+
+import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.XMPPConnection;
+
+public final class IoTManager extends Manager {
+
+    private static final Map<XMPPConnection, IoTManager> INSTANCES = new WeakHashMap<>();
+
+    public static synchronized IoTManager getInstanceFor(XMPPConnection connection) {
+        IoTManager manager = INSTANCES.get(connection);
+        if (manager == null) {
+            manager = new IoTManager(connection);
+            INSTANCES.put(connection, manager);
+        }
+        return manager;
+    }
+
+    private IoTManager(XMPPConnection connection) {
+        super(connection);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/Thing.java

@@ -0,0 +1,161 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+
+import org.jivesoftware.smackx.iot.control.ThingControlRequest;
+import org.jivesoftware.smackx.iot.data.ThingMomentaryReadOutRequest;
+import org.jivesoftware.smackx.iot.discovery.element.Tag;
+import org.jivesoftware.smackx.iot.discovery.element.Tag.Type;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public final class Thing {
+
+    private final HashMap<String, Tag> metaTags;
+    private final boolean selfOwned;
+    private final NodeInfo nodeInfo;
+
+    private final ThingMomentaryReadOutRequest momentaryReadOutRequestHandler;
+    private final ThingControlRequest controlRequestHandler;
+
+    private Thing(Builder builder) {
+        this.metaTags = builder.metaTags;
+        this.selfOwned = builder.selfOwned;
+
+        this.nodeInfo = builder.nodeInfo;
+
+        this.momentaryReadOutRequestHandler = builder.momentaryReadOutRequest;
+        this.controlRequestHandler = builder.controlRequest;
+    }
+
+    public Collection<Tag> getMetaTags() {
+        return metaTags.values();
+    }
+
+    public boolean isSelfOwened() {
+        return selfOwned;
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    public String getNodeId() {
+        return nodeInfo.getNodeId();
+    }
+
+    public String getSourceId() {
+        return nodeInfo.getSourceId();
+    }
+
+    public String getCacheType() {
+        return nodeInfo.getCacheType();
+    }
+
+    public ThingMomentaryReadOutRequest getMomentaryReadOutRequestHandler() {
+        return momentaryReadOutRequestHandler;
+    }
+
+    public ThingControlRequest getControlRequestHandler() {
+        return controlRequestHandler;
+    }
+
+    private String toStringCache;
+
+    @Override
+    public String toString() {
+        if (toStringCache == null) {
+            StringBuilder sb = new StringBuilder();
+            sb.append( "Thing " + nodeInfo + " [");
+            Iterator<Tag> it = metaTags.values().iterator();
+            while (it.hasNext()) {
+                Tag tag = it.next();
+                sb.append(tag);
+                if (it.hasNext()) {
+                    sb.append(' ');
+                }
+            }
+            sb.append(']');
+            toStringCache = sb.toString();
+        }
+        return toStringCache;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+        private HashMap<String, Tag> metaTags = new HashMap<>();
+        private boolean selfOwned;
+        private NodeInfo nodeInfo = NodeInfo.EMPTY;
+        private ThingMomentaryReadOutRequest momentaryReadOutRequest;
+        private ThingControlRequest controlRequest;
+
+        public Builder setSerialNumber(String sn) {
+            final String name = "SN";
+            Tag tag = new Tag(name, Type.str, sn);
+            metaTags.put(name, tag);
+            return this;
+        }
+
+        public Builder setKey(String key) {
+            final String name = "KEY";
+            Tag tag = new Tag(name, Type.str, key);
+            metaTags.put(name, tag);
+            return this;
+        }
+
+        public Builder setManufacturer(String manufacturer) {
+            final String name = "MAN";
+            Tag tag = new Tag(name, Type.str, manufacturer);
+            metaTags.put(name, tag);
+            return this;
+        }
+
+        public Builder setModel(String model) {
+            final String name = "MODEL";
+            Tag tag = new Tag(name, Type.str, model);
+            metaTags.put(name, tag);
+            return this;
+        }
+
+        public Builder setVersion(String version) {
+            final String name = "V";
+            Tag tag = new Tag(name, Type.num, version);
+            metaTags.put(name, tag);
+            return this;
+        }
+
+        public Builder setMomentaryReadOutRequestHandler(ThingMomentaryReadOutRequest momentaryReadOutRequestHandler) {
+            this.momentaryReadOutRequest = momentaryReadOutRequestHandler;
+            return this;
+        }
+
+        public Builder setControlRequestHandler(ThingControlRequest controlRequest) {
+            this.controlRequest = controlRequest;
+            return this;
+        }
+
+        public Thing build() {
+            return new Thing(this);
+        }
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/IoTControlManager.java

@@ -0,0 +1,149 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.WeakHashMap;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.SmackException.NoResponseException;
+import org.jivesoftware.smack.SmackException.NotConnectedException;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
+import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.Thing;
+import org.jivesoftware.smackx.iot.control.element.IoTSetRequest;
+import org.jivesoftware.smackx.iot.control.element.IoTSetResponse;
+import org.jivesoftware.smackx.iot.control.element.SetData;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.FullJid;
+
+/**
+ * A manger for XEP-0325: Internet of Things - Control.
+ * 
+ * @author Florian Schmaus {@literal <flo@geekplace.eu>}
+ * @see <a href="http://xmpp.org/extensions/xep-0325.html">XEP-0323: Internet of Things - Control</a>
+ */
+public final class IoTControlManager extends Manager {
+
+    private static final Map<XMPPConnection, IoTControlManager> INSTANCES = new WeakHashMap<>();
+
+    /**
+     * Get the manger instance responsible for the given connection.
+     *
+     * @param connection the XMPP connection.
+     * @return a manager instance.
+     */
+    public static synchronized IoTControlManager getInstanceFor(XMPPConnection connection) {
+        IoTControlManager manager = INSTANCES.get(connection);
+        if (manager == null) {
+            manager = new IoTControlManager(connection);
+            INSTANCES.put(connection, manager);
+        }
+        return manager;
+    }
+
+    private final Map<NodeInfo, Thing> things = new ConcurrentHashMap<>();
+
+    private IoTControlManager(XMPPConnection connection) {
+        super(connection);
+        connection.registerIQRequestHandler(new AbstractIqRequestHandler(IoTSetRequest.ELEMENT, IoTSetRequest.NAMESPACE, IQ.Type.set, Mode.async) {
+            @Override
+            public IQ handleIQRequest(IQ iqRequest) {
+                // TODO Lookup thing and provide data.
+                IoTSetRequest iotSetRequest = (IoTSetRequest) iqRequest;
+
+                // TODO Add support for multiple things(/NodeInfos).
+                final Thing thing = things.get(NodeInfo.EMPTY);
+                if (thing == null) {
+                    // TODO return error if not at least one thing registered.
+                    return null;
+                }
+
+                ThingControlRequest controlRequest = thing.getControlRequestHandler();
+                if (controlRequest == null) {
+                    // TODO return error if no request handler for things.
+                    return null;
+                }
+
+                try {
+                    controlRequest.processRequest(iotSetRequest.getFrom(), iotSetRequest.getSetData());
+                } catch (XMPPErrorException e) {
+                    return IQ.createErrorResponse(iotSetRequest, e.getXMPPError());
+                }
+
+                return new IoTSetResponse(iotSetRequest);
+            }
+        });
+    }
+
+    /**
+     * Control a thing by sending a collection of {@link SetData} instructions.
+     *
+     * @param jid
+     * @param data
+     * @return
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     * @see #setUsingIq(FullJid, Collection)
+     */
+    public IoTSetResponse setUsingIq(FullJid jid, SetData data) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        return setUsingIq(jid, Collections.singleton(data));
+    }
+
+    /**
+     * Control a thing by sending a collection of {@link SetData} instructions.
+     *
+     * @param jid the thing to control.
+     * @param data a collection of {@link SetData} instructions.
+     * @return the {@link IoTSetResponse} if successful.
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     */
+    public IoTSetResponse setUsingIq(FullJid jid, Collection<SetData> data) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        IoTSetRequest request = new IoTSetRequest(data);
+        request.setTo(jid);
+        IoTSetResponse response = connection().createPacketCollectorAndSend(request).nextResultOrThrow();
+        return response;
+    }
+
+    /**
+     * Install a thing in the manager. Activates control functionality (if provided by the thing).
+     *
+     * @param thing the thing to install.
+     */
+    public void installThing(Thing thing) {
+        things.put(thing.getNodeInfo(), thing);
+    }
+
+    public Thing uninstallThing(Thing thing) {
+        return uninstallThing(thing.getNodeInfo());
+    }
+
+    public Thing uninstallThing(NodeInfo nodeInfo) {
+        return things.remove(nodeInfo);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/ThingControlRequest.java

@@ -0,0 +1,29 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control;
+
+import java.util.Collection;
+
+import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smackx.iot.control.element.SetData;
+import org.jxmpp.jid.Jid;
+
+public interface ThingControlRequest {
+
+    public void processRequest(Jid from, Collection<SetData> setData) throws XMPPErrorException;
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/Constants.java

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+public class Constants {
+
+    public static final String IOT_CONTROL_NAMESPACE = "urn:xmpp:iot:control";
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java

@@ -0,0 +1,48 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import org.jivesoftware.smack.packet.IQ;
+
+public class IoTSetRequest extends IQ {
+
+    public static final String ELEMENT = "set";
+    public static final String NAMESPACE = Constants.IOT_CONTROL_NAMESPACE;
+
+    private final Collection<SetData> setData;
+
+    public IoTSetRequest(Collection<SetData> setData) {
+        super(ELEMENT, NAMESPACE);
+        setType(Type.set);
+        this.setData = Collections.unmodifiableCollection(setData);
+    }
+
+    public Collection<SetData> getSetData() {
+        return setData;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.rightAngleBracket();
+        xml.append(setData);
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetResponse.java

@@ -0,0 +1,41 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+import org.jivesoftware.smack.packet.IQ;
+
+public class IoTSetResponse extends IQ {
+
+    public static final String ELEMENT = "setResponse";
+    public static final String NAMESPACE = Constants.IOT_CONTROL_NAMESPACE;
+
+    public IoTSetResponse() {
+        super(ELEMENT, NAMESPACE);
+    }
+
+    public IoTSetResponse(IoTSetRequest iotSetRequest) {
+        this();
+        initialzeAsResultFor(iotSetRequest);
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetBoolData.java

@@ -0,0 +1,38 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+public class SetBoolData extends SetData {
+
+    public SetBoolData(String name, boolean value) {
+        this(name, Boolean.toString(value));
+        booleanCache = value;
+    }
+
+    protected SetBoolData(String name, String value) {
+        super(name, Type.BOOL, value);
+    }
+
+    private Boolean booleanCache;
+
+    public Boolean getBooleanValue() {
+        if (booleanCache != null) {
+            booleanCache = Boolean.valueOf(getValue());
+        }
+        return booleanCache;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetData.java

@@ -0,0 +1,92 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+import java.util.Locale;
+
+import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+public abstract class SetData implements NamedElement {
+
+    public enum Type {
+        BOOL,
+        INT,
+        LONG,
+        DOUBLE,
+        ;
+
+        private String toStringCache;
+
+        private Type() {
+            toStringCache = this.name().toLowerCase(Locale.US);
+        }
+
+        @Override
+        public String toString() {
+            return toStringCache;
+        }
+    }
+
+    protected SetData(String name, Type type, String value) {
+        this.name = name;
+        this.type = type;
+        this.value = value;
+    }
+
+    private final String name;
+
+    private final Type type;
+
+    private final String value;
+
+    public final String getName() {
+        return name;
+    }
+
+    public final String getValue() {
+        return value;
+    }
+
+    public final Type getType() {
+        return type;
+    }
+
+    /**
+     * Returns the root element name.
+     *
+     * @return the element name.
+     */
+    @Override
+    public final String getElementName() {
+        return getType().toString();
+    }
+
+    /**
+     * Returns the XML representation of this Element.
+     *
+     * @return the stanza(/packet) extension as XML.
+     */
+    @Override
+    public final XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("name", name);
+        xml.attribute("value", value);
+        xml.closeEmptyElement();
+        return xml;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetDoubleData.java

@@ -0,0 +1,38 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+public class SetDoubleData extends SetData {
+
+    public SetDoubleData(String name, double value) {
+        this(name, Double.toString(value));
+        doubleCache = value;
+    }
+
+    protected SetDoubleData(String name, String value) {
+        super(name, Type.DOUBLE, value);
+    }
+
+    private Double doubleCache;
+
+    public Double getDoubleValue() {
+        if (doubleCache != null) {
+            doubleCache = Double.valueOf(getValue());
+        }
+        return doubleCache;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetIntData.java

@@ -0,0 +1,38 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+public class SetIntData extends SetData {
+
+    public SetIntData(String name, int value) {
+        this(name, Integer.toString(value));
+        integerCache = value;
+    }
+
+    protected SetIntData(String name, String value) {
+        super(name, Type.INT, value);
+    }
+
+    private Integer integerCache;
+
+    public Integer getIntegerValue() {
+        if (integerCache != null) {
+            integerCache = Integer.valueOf(getValue());
+        }
+        return integerCache;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/SetLongData.java

@@ -0,0 +1,38 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.element;
+
+public class SetLongData extends SetData {
+
+    public SetLongData(String name, long value) {
+        this(name, Long.toString(value));
+        longCache = value;
+    }
+
+    protected SetLongData(String name, String value) {
+        super(name, Type.LONG, value);
+    }
+
+    private Long longCache;
+
+    public Long getLongValue() {
+        if (longCache != null) {
+            longCache = Long.valueOf(getValue());
+        }
+        return longCache;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.control.element;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.control;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/provider/IoTSetRequestProvider.java

@@ -0,0 +1,82 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.provider;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smackx.iot.control.element.IoTSetRequest;
+import org.jivesoftware.smackx.iot.control.element.SetBoolData;
+import org.jivesoftware.smackx.iot.control.element.SetData;
+import org.jivesoftware.smackx.iot.control.element.SetDoubleData;
+import org.jivesoftware.smackx.iot.control.element.SetIntData;
+import org.jivesoftware.smackx.iot.control.element.SetLongData;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTSetRequestProvider extends IQProvider<IoTSetRequest> {
+
+    @Override
+    public IoTSetRequest parse(XmlPullParser parser, int initialDepth) throws Exception {
+        List<SetData> data = new ArrayList<>(4);
+        outerloop: while (true) {
+            final int eventType = parser.next();
+            final String name = parser.getName();
+            switch (eventType) {
+            case XmlPullParser.START_TAG:
+                switch (name) {
+                case "bool": {
+                    String valueName = parser.getAttributeValue(null, "name");
+                    String valueString = parser.getAttributeValue(null, "value");
+                    boolean value = Boolean.parseBoolean(valueString);
+                    data.add(new SetBoolData(valueName, value));
+                }
+                    break;
+                case "double": {
+                    String valueName = parser.getAttributeValue(null, "name");
+                    String valueString = parser.getAttributeValue(null, "value");
+                    double value = Double.parseDouble(valueString);
+                    data.add(new SetDoubleData(valueName, value));
+                }
+                    break;
+                case "int": {
+                    String valueName = parser.getAttributeValue(null, "name");
+                    String valueString = parser.getAttributeValue(null, "value");
+                    int value = Integer.parseInt(valueString);
+                    data.add(new SetIntData(valueName, value));
+                }
+                    break;
+                case "long": {
+                    String valueName = parser.getAttributeValue(null, "name");
+                    String valueString = parser.getAttributeValue(null, "value");
+                    long value = Long.parseLong(valueString);
+                    data.add(new SetLongData(valueName, value));
+                }
+                    break;
+                }
+                break;
+            case XmlPullParser.END_TAG:
+                if (parser.getDepth() == initialDepth) {
+                    break outerloop;
+                }
+                break;
+            }
+        }
+        return new IoTSetRequest(data);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/provider/IoTSetResponseProvider.java

@@ -0,0 +1,30 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.control.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smackx.iot.control.element.IoTSetResponse;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTSetResponseProvider extends IQProvider<IoTSetResponse> {
+
+    @Override
+    public IoTSetResponse parse(XmlPullParser parser, int initialDepth) throws Exception {
+        return new IoTSetResponse();
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/provider/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.control.provider;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/IoTDataManager.java

@@ -0,0 +1,210 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.WeakHashMap;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.PacketCollector;
+import org.jivesoftware.smack.SmackException.NoResponseException;
+import org.jivesoftware.smack.SmackException.NotConnectedException;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPConnectionRegistry;
+import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.filter.StanzaFilter;
+import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
+import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smackx.iot.Thing;
+import org.jivesoftware.smackx.iot.data.element.IoTDataField;
+import org.jivesoftware.smackx.iot.data.element.IoTDataReadOutAccepted;
+import org.jivesoftware.smackx.iot.data.element.IoTDataRequest;
+import org.jivesoftware.smackx.iot.data.element.IoTFieldsExtension;
+import org.jivesoftware.smackx.iot.data.filter.IoTFieldsExtensionFilter;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.EntityFullJid;
+
+/**
+ * A manager for XEP-0323: Internet of Things - Sensor Data.
+ * 
+ * @author Florian Schmaus {@literal <flo@geekplace.eu>}
+ * @see <a href="http://xmpp.org/extensions/xep-0323.html">XEP-0323: Internet of Things - Sensor Data</a>
+ */
+public final class IoTDataManager extends Manager {
+
+    private static final Logger LOGGER = Logger.getLogger(IoTDataManager.class.getName());
+
+    private static final Map<XMPPConnection, IoTDataManager> INSTANCES = new WeakHashMap<>();
+
+    // Ensure a IoTDataManager exists for every connection.
+    static {
+        XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            public void connectionCreated(XMPPConnection connection) {
+                getInstanceFor(connection);
+            }
+        });
+    }
+
+    /**
+     * Get the manger instance responsible for the given connection.
+     *
+     * @param connection the XMPP connection.
+     * @return a manager instance.
+     */
+    public static synchronized IoTDataManager getInstanceFor(XMPPConnection connection) {
+        IoTDataManager manager = INSTANCES.get(connection);
+        if (manager == null) {
+            manager = new IoTDataManager(connection);
+            INSTANCES.put(connection, manager);
+        }
+        return manager;
+    }
+
+    private final AtomicInteger nextSeqNr = new AtomicInteger();
+
+    private final Map<NodeInfo, Thing> things = new ConcurrentHashMap<>();
+
+    private IoTDataManager(XMPPConnection connection) {
+        super(connection);
+
+        connection.registerIQRequestHandler(new AbstractIqRequestHandler(IoTDataRequest.ELEMENT,
+                        IoTDataRequest.NAMESPACE, IQ.Type.get, Mode.async) {
+            @Override
+            public IQ handleIQRequest(IQ iqRequest) {
+                // TODO Verify that iqRequest.from is friend?
+
+                final IoTDataRequest dataRequest = (IoTDataRequest) iqRequest;
+
+                if (!dataRequest.isMomentary()) {
+                    // TODO return error IQ that non momentary requests are not implemented yet.
+                    return null;
+                }
+
+                // TODO Add support for multiple things(/NodeInfos).
+                final Thing thing = things.get(NodeInfo.EMPTY);
+                if (thing == null) {
+                    // TODO return error if not at least one thing registered.
+                    return null;
+                }
+
+                ThingMomentaryReadOutRequest readOutRequest = thing.getMomentaryReadOutRequestHandler();
+                if (readOutRequest == null) {
+                    // TODO Thing does not provide momentary read-out
+                    return null;
+                }
+
+                // Callback hell begins here. :) XEP-0323 decouples the read-out results from the IQ result. I'm not
+                // sure if I would have made the same design decision but the reasons where likely being able to get a
+                // fast read-out acknowledgement back to the requester even with sensors that take "a long time" to
+                // read-out their values. I had designed that as special case and made the "results in IQ response" the
+                // normal case.
+                readOutRequest.momentaryReadOutRequest(new ThingMomentaryReadOutResult() {
+                    @Override
+                    public void momentaryReadOut(List<? extends IoTDataField> results) {
+                        IoTFieldsExtension iotFieldsExtension = IoTFieldsExtension.buildFor(dataRequest.getSequenceNr(), true, thing.getNodeInfo(), results);
+                        Message message = new Message(dataRequest.getFrom());
+                        message.addExtension(iotFieldsExtension);
+                        try {
+                            connection().sendStanza(message);
+                        }
+                        catch (NotConnectedException | InterruptedException e) {
+                            LOGGER.log(Level.SEVERE, "Could not send read-out response " + message, e);
+                        }
+                    }
+                });
+
+                return new IoTDataReadOutAccepted(dataRequest);
+            }
+        });
+    }
+
+    /**
+     * Install a thing in the manager. Activates data read out functionality (if provided by the
+     * thing).
+     *
+     * @param thing the thing to install.
+     */
+    public void installThing(Thing thing) {
+        things.put(thing.getNodeInfo(), thing);
+    }
+
+    public Thing uninstallThing(Thing thing) {
+        return uninstallThing(thing.getNodeInfo());
+    }
+
+    public Thing uninstallThing(NodeInfo nodeInfo) {
+        return things.remove(nodeInfo);
+    }
+
+    /**
+     * Try to read out a things momentary values.
+     *
+     * @param jid the full JID of the thing to read data from.
+     * @return a list with the read out data.
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     */
+    public List<IoTFieldsExtension> requestMomentaryValuesReadOut(EntityFullJid jid)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        final XMPPConnection connection = connection();
+        final int seqNr = nextSeqNr.incrementAndGet();
+        IoTDataRequest iotDataRequest = new IoTDataRequest(seqNr, true);
+        iotDataRequest.setTo(jid);
+
+        StanzaFilter doneFilter = new IoTFieldsExtensionFilter(seqNr, true);
+        StanzaFilter dataFilter = new IoTFieldsExtensionFilter(seqNr, false);
+
+        // Setup the IoTFieldsExtension message collectors before sending the IQ to avoid a data race.
+        PacketCollector doneCollector = connection.createPacketCollector(doneFilter);
+
+        PacketCollector.Configuration dataCollectorConfiguration = PacketCollector.newConfiguration().setStanzaFilter(
+                        dataFilter).setCollectorToReset(doneCollector);
+        PacketCollector dataCollector = connection.createPacketCollector(dataCollectorConfiguration);
+
+        try {
+            connection.createPacketCollectorAndSend(iotDataRequest).nextResultOrThrow();
+            // Wait until a message with an IoTFieldsExtension and the done flag comes in.
+            doneCollector.nextResult();
+        }
+        finally {
+            // Ensure that the two collectors are canceled in any case.
+            dataCollector.cancel();
+            doneCollector.cancel();
+        }
+
+        int collectedCount = dataCollector.getCollectedCount();
+        List<IoTFieldsExtension> res = new ArrayList<>(collectedCount);
+        for (int i = 0; i < collectedCount; i++) {
+            Message message = dataCollector.pollResult();
+            IoTFieldsExtension iotFieldsExtension = IoTFieldsExtension.from(message);
+            res.add(iotFieldsExtension);
+        }
+
+        return res;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/ThingMomentaryReadOutRequest.java

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data;
+
+public interface ThingMomentaryReadOutRequest {
+
+    public void momentaryReadOutRequest(ThingMomentaryReadOutResult callback);
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/ThingMomentaryReadOutResult.java

@@ -0,0 +1,27 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data;
+
+import java.util.List;
+
+import org.jivesoftware.smackx.iot.data.element.IoTDataField;
+
+public interface ThingMomentaryReadOutResult {
+
+    public void momentaryReadOut(List<? extends IoTDataField> results);
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/Constants.java

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+public class Constants {
+
+    public static final String IOT_SENSORDATA_NAMESPACE = "urn:xmpp:iot:data";
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTDataField.java

@@ -0,0 +1,111 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+public abstract class IoTDataField implements NamedElement {
+
+    enum Type {
+        integer("int"),
+        bool("boolean"),
+        ;
+
+        Type(String stringRepresentation) {
+            this.stringRepresentation = stringRepresentation;
+        }
+
+        private final String stringRepresentation;
+    }
+
+    private final Type type;
+
+    private final String name;
+
+    protected IoTDataField(Type type, String name) {
+        this.type = type;
+        this.name = name;
+    }
+
+    public final String getName() {
+        return name;
+    }
+
+    @Override
+    public final String getElementName() {
+        return type.stringRepresentation;
+    }
+
+    @Override
+    public final XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("name", name).attribute("value", getValueString());
+        // TODO handle 'unit' attribute as special case if <numeric/> is implemented.
+        xml.closeEmptyElement();
+        return xml;
+    }
+
+    private String valueString;
+
+    public final String getValueString() {
+        if (valueString == null) {
+            valueString = getValueInternal();
+        }
+        return valueString;
+    }
+
+    protected abstract String getValueInternal();
+
+    public static class IntField extends IoTDataField {
+
+        private final int value;
+
+        public IntField(String name, int value) {
+            super(Type.integer, name);
+            this.value = value;
+        }
+
+        @Override
+        protected String getValueInternal() {
+            return Integer.toString(value);
+        }
+
+        public int getValue() {
+            return value;
+        }
+    }
+
+    public static class BooleanField extends IoTDataField {
+
+        private final boolean value;
+
+        public BooleanField(String name, boolean value) {
+            super(Type.bool, name);
+            this.value = value;
+        }
+
+        @Override
+        protected String getValueInternal() {
+            return Boolean.toString(value);
+        }
+
+        public boolean getValue() {
+            return value;
+        }
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTDataReadOutAccepted.java

@@ -0,0 +1,54 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import org.jivesoftware.smack.packet.IQ;
+
+public class IoTDataReadOutAccepted extends IQ {
+
+    public static final String ELEMENT = "accepted";
+    public static final String NAMESPACE = Constants.IOT_SENSORDATA_NAMESPACE;
+
+    /**
+     * The sequence number. According to XEP-0323 an xs:int.
+     */
+    private final int seqNr;
+
+    private final boolean queued;
+
+    public IoTDataReadOutAccepted(int seqNr, boolean queued) {
+        super(ELEMENT, NAMESPACE);
+        this.seqNr = seqNr;
+        this.queued = queued;
+        setType(Type.result);
+    }
+
+    public IoTDataReadOutAccepted(IoTDataRequest dataRequest) {
+        this(dataRequest.getSequenceNr(), false);
+        setStanzaId(dataRequest.getStanzaId());
+        setTo(dataRequest.getFrom());
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("seqnr", seqNr);
+        xml.optBooleanAttribute("queued", queued);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTDataRequest.java

@@ -0,0 +1,54 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import org.jivesoftware.smack.packet.IQ;
+
+public class IoTDataRequest extends IQ {
+
+    public static final String ELEMENT = "req";
+    public static final String NAMESPACE = Constants.IOT_SENSORDATA_NAMESPACE;
+
+    /**
+     * The sequence nummber. According to XEP-0323 an xs:int.
+     */
+    private final int seqNr;
+
+    private final boolean momentary;
+
+    public IoTDataRequest(int seqNr, boolean momentary) {
+        super(ELEMENT, NAMESPACE);
+        this.seqNr = seqNr;
+        this.momentary = momentary;
+    }
+
+    public int getSequenceNr() {
+        return seqNr;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("seqnr", seqNr);
+        xml.optBooleanAttribute("momentary", momentary);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+    public boolean isMomentary() {
+        return momentary;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/IoTFieldsExtension.java

@@ -0,0 +1,92 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+
+import org.jivesoftware.smack.packet.ExtensionElement;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class IoTFieldsExtension implements ExtensionElement {
+
+    public static final String ELEMENT = "fields";
+    public static final String NAMESPACE = Constants.IOT_SENSORDATA_NAMESPACE;
+
+    private final int seqNr;
+    private final boolean done;
+    private final List<NodeElement> nodes;
+
+    public IoTFieldsExtension(int seqNr, boolean done, NodeElement node) {
+        this(seqNr, done, Collections.singletonList(node));
+    }
+
+    public IoTFieldsExtension(int seqNr, boolean done, List<NodeElement> nodes) {
+        this.seqNr = seqNr;
+        this.done = done;
+        this.nodes = Collections.unmodifiableList(nodes);
+    }
+
+    public int getSequenceNr() {
+        return seqNr;
+    }
+
+    public boolean isDone() {
+        return done;
+    }
+
+    public List<NodeElement> getNodes() {
+        return nodes;
+    }
+
+    @Override
+    public String getElementName() {
+        return ELEMENT;
+    }
+
+    @Override
+    public String getNamespace() {
+        return NAMESPACE;
+    }
+
+    @Override
+    public XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("seqnr", Integer.toString(seqNr));
+        xml.attribute("done", done);
+        xml.rightAngleBracket();
+
+        xml.append(nodes);
+
+        xml.closeElement(this);
+        return xml;
+    }
+
+    public static IoTFieldsExtension buildFor(int seqNr, boolean done, NodeInfo nodeInfo,
+                    List<? extends IoTDataField> data) {
+        TimestampElement timestampElement = new TimestampElement(new Date(), data);
+        NodeElement nodeElement = new NodeElement(nodeInfo, timestampElement);
+        return new IoTFieldsExtension(seqNr, done, nodeElement);
+    }
+
+    public static IoTFieldsExtension from(Message message) {
+        return message.getExtension(ELEMENT, NAMESPACE);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/NodeElement.java

@@ -0,0 +1,63 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class NodeElement implements NamedElement {
+
+    public static final String ELEMENT = "node";
+
+    private final NodeInfo nodeInfo;
+    private final List<TimestampElement> timestampElements;
+
+    public NodeElement(NodeInfo nodeInfo, TimestampElement timestampElement) {
+        this(nodeInfo, Collections.singletonList(timestampElement));
+    }
+
+    public NodeElement(NodeInfo nodeInfo, List<TimestampElement> timestampElements) {
+        this.nodeInfo = nodeInfo;
+        this.timestampElements = Collections.unmodifiableList(timestampElements);
+    }
+
+    public List<TimestampElement> getTimestampElements() {
+        return timestampElements;
+    }
+
+    @Override
+    public String getElementName() {
+        return ELEMENT;
+    }
+
+    @Override
+    public XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        nodeInfo.appendTo(xml);
+        xml.rightAngleBracket();
+
+        xml.append(timestampElements);
+
+        xml.closeElement(this);
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/TimestampElement.java

@@ -0,0 +1,59 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.element;
+
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+
+import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+public class TimestampElement implements NamedElement {
+
+    public static final String ELEMENT = "timestamp";
+
+    private final Date date;
+    private final List<? extends IoTDataField> fields;
+
+    public TimestampElement(Date date, List<? extends IoTDataField> fields) {
+        this.date = date;
+        this.fields = Collections.unmodifiableList(fields);
+    }
+
+    public List<? extends IoTDataField> getDataFields() {
+        return fields;
+    }
+
+    @Override
+    public String getElementName() {
+        return ELEMENT;
+    }
+
+    @Override
+    public XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("value", date);
+        xml.rightAngleBracket();
+
+        xml.append(fields);
+
+        xml.closeElement(this);
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/element/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.data.element;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/filter/IoTFieldsExtensionFilter.java

@@ -0,0 +1,48 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.filter;
+
+import org.jivesoftware.smack.filter.FlexibleStanzaTypeFilter;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smackx.iot.data.element.IoTFieldsExtension;
+
+public class IoTFieldsExtensionFilter extends FlexibleStanzaTypeFilter<Message> {
+
+    private final int seqNr;
+    private final boolean onlyDone;
+
+    public IoTFieldsExtensionFilter(int seqNr, boolean onlyDone) {
+        this.seqNr = seqNr;
+        this.onlyDone = onlyDone;
+    }
+
+    @Override
+    protected boolean acceptSpecific(Message message) {
+        IoTFieldsExtension iotFieldsExtension = IoTFieldsExtension.from(message);
+        if (iotFieldsExtension == null) {
+            return false;
+        }
+        if (iotFieldsExtension.getSequenceNr() != seqNr) {
+            return false;
+        }
+        if (onlyDone && !iotFieldsExtension.isDone()) {
+            return false;
+        }
+        return true;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/filter/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.data.filter;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.data;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/provider/IoTDataReadOutAcceptedProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.data.element.IoTDataReadOutAccepted;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTDataReadOutAcceptedProvider extends IQProvider<IoTDataReadOutAccepted> {
+
+    @Override
+    public IoTDataReadOutAccepted parse(XmlPullParser parser, int initialDepth) throws Exception {
+        int seqNr = ParserUtils.getIntegerAttributeOrThrow(parser, "seqnr", "IoT data request <accepted/> without sequence number");
+        boolean queued = ParserUtils.getBooleanAttribute(parser, "queued", false);
+        return new IoTDataReadOutAccepted(seqNr, queued);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/provider/IoTDataRequestProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.data.element.IoTDataRequest;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTDataRequestProvider extends IQProvider<IoTDataRequest> {
+
+    @Override
+    public IoTDataRequest parse(XmlPullParser parser, int initialDepth) throws Exception {
+        int seqNr = ParserUtils.getIntegerAttributeOrThrow(parser, "seqnr", "IoT data request without sequence number");
+        boolean momentary = ParserUtils.getBooleanAttribute(parser, "momentary", false);
+        return new IoTDataRequest(seqNr, momentary);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/provider/IoTFieldsExtensionProvider.java

@@ -0,0 +1,136 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.data.provider;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.provider.ExtensionElementProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.data.element.IoTDataField;
+import org.jivesoftware.smackx.iot.data.element.IoTFieldsExtension;
+import org.jivesoftware.smackx.iot.data.element.NodeElement;
+import org.jivesoftware.smackx.iot.data.element.TimestampElement;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.jxmpp.util.XmppDateTime;
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+public class IoTFieldsExtensionProvider extends ExtensionElementProvider<IoTFieldsExtension> {
+
+    private static final Logger LOGGER = Logger.getLogger(IoTFieldsExtensionProvider.class.getName());
+
+    @Override
+    public IoTFieldsExtension parse(XmlPullParser parser, int initialDepth) throws Exception {
+        int seqNr = ParserUtils.getIntegerAttributeOrThrow(parser, "seqnr", "IoT data request <accepted/> without sequence number");
+        boolean done = ParserUtils.getBooleanAttribute(parser, "done", false);
+        List<NodeElement> nodes = new ArrayList<>();
+        outerloop: while (true) {
+            final int eventType = parser.next();
+            final String name = parser.getName();
+            switch (eventType) {
+            case XmlPullParser.START_TAG:
+                switch (name) {
+                case NodeElement.ELEMENT:
+                    NodeElement node = parseNode(parser);
+                    nodes.add(node);
+                    break;
+                }
+                break;
+            case XmlPullParser.END_TAG:
+                if (parser.getDepth() == initialDepth) {
+                    break outerloop;
+                }
+                break;
+            }
+        }
+        return new IoTFieldsExtension(seqNr, done, nodes);
+    }
+
+    public NodeElement parseNode(XmlPullParser parser) throws XmlPullParserException, IOException, ParseException {
+        final int initialDepth = parser.getDepth();
+        final NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        List<TimestampElement> timestampElements = new ArrayList<>();
+        outerloop: while (true) {
+            final int eventType = parser.next();
+            final String name = parser.getName();
+            switch (eventType) {
+            case XmlPullParser.START_TAG:
+                switch (name){
+                case TimestampElement.ELEMENT:
+                    TimestampElement timestampElement = parseTimestampElement(parser);
+                    timestampElements.add(timestampElement);
+                    break;
+                }
+                break;
+            case XmlPullParser.END_TAG:
+                if (parser.getDepth() == initialDepth) {
+                    break outerloop;
+                }
+                break;
+            }
+        }
+        return new NodeElement(nodeInfo, timestampElements);
+    }
+
+    public TimestampElement parseTimestampElement(XmlPullParser parser) throws ParseException, XmlPullParserException, IOException {
+        final int initialDepth = parser.getDepth();
+        final String dateString = parser.getAttributeValue(null, "value");
+        final Date date = XmppDateTime.parseDate(dateString);
+        List<IoTDataField> fields = new ArrayList<>();
+        outerloop: while (true) {
+            final int eventType = parser.next();
+            final String name = parser.getName();
+            switch (eventType) {
+            case XmlPullParser.START_TAG:
+                IoTDataField field = null;
+                final String fieldName = parser.getAttributeValue(null, "name");
+                final String fieldValue = parser.getAttributeValue(null, "value");
+                switch (name) {
+                case "int": {
+                    int value = Integer.parseInt(fieldValue);
+                    field = new IoTDataField.IntField(fieldName, value);
+                    }
+                    break;
+                case "boolean": {
+                    boolean value = Boolean.parseBoolean(fieldValue);
+                    field = new IoTDataField.BooleanField(fieldName, value);
+                    }
+                    break;
+                default:
+                    LOGGER.warning("IoT Data field type '" + name + "' not implement yet. Ignoring.");
+                    break;
+                }
+                if (field != null) {
+                    fields.add(field);
+                }
+                break;
+            case XmlPullParser.END_TAG:
+                if (parser.getDepth() == initialDepth) {
+                    break outerloop;
+                }
+                break;
+            }
+        }
+        return new TimestampElement(date, fields);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/data/provider/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.data.provider;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/AbstractThingStateChangeListener.java

@@ -0,0 +1,27 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery;
+
+import org.jxmpp.jid.BareJid;
+
+public abstract class AbstractThingStateChangeListener implements ThingStateChangeListener {
+
+    @Override
+    public void owned(BareJid owner) {
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/IoTClaimedException.java

@@ -0,0 +1,38 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery;
+
+import org.jivesoftware.smackx.iot.IoTException;
+import org.jivesoftware.smackx.iot.discovery.element.IoTClaimed;
+
+public class IoTClaimedException extends IoTException {
+
+    /**
+     * 
+     */
+    private static final long serialVersionUID = 1L;
+
+    private final IoTClaimed iotClaimed;
+
+    public IoTClaimedException(IoTClaimed iotClaimed) {
+        this.iotClaimed = iotClaimed;
+    }
+
+    public IoTClaimed getIoTClaimed() {
+        return iotClaimed;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/IoTDiscoveryManager.java

@@ -0,0 +1,420 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.WeakHashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.SmackException.NoResponseException;
+import org.jivesoftware.smack.SmackException.NotConnectedException;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPConnectionRegistry;
+import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
+import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
+import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
+import org.jivesoftware.smackx.iot.Thing;
+import org.jivesoftware.smackx.iot.control.IoTControlManager;
+import org.jivesoftware.smackx.iot.data.IoTDataManager;
+import org.jivesoftware.smackx.iot.discovery.element.Constants;
+import org.jivesoftware.smackx.iot.discovery.element.IoTClaimed;
+import org.jivesoftware.smackx.iot.discovery.element.IoTDisown;
+import org.jivesoftware.smackx.iot.discovery.element.IoTDisowned;
+import org.jivesoftware.smackx.iot.discovery.element.IoTMine;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRegister;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRemove;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRemoved;
+import org.jivesoftware.smackx.iot.discovery.element.IoTUnregister;
+import org.jivesoftware.smackx.iot.discovery.element.Tag;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.provisioning.IoTProvisioningManager;
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.Jid;
+
+/**
+ * A manager for XEP-0347: Internet of Things - Discovery. Used to register and discover things.
+ *
+ * @author Florian Schmaus {@literal <flo@geekplace.eu>}
+ * @see <a href="http://xmpp.org/extensions/xep-0347.html">XEP-0347: Internet of Things - Discovery</a>
+ *
+ */
+public final class IoTDiscoveryManager extends Manager {
+
+    private static final Logger LOGGER = Logger.getLogger(IoTDiscoveryManager.class.getName());
+
+    private static final Map<XMPPConnection, IoTDiscoveryManager> INSTANCES = new WeakHashMap<>();
+
+    // Ensure a IoTProvisioningManager exists for every connection.
+    static {
+        XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            public void connectionCreated(XMPPConnection connection) {
+                getInstanceFor(connection);
+            }
+        });
+    }
+
+    /**
+     * Get the manger instance responsible for the given connection.
+     *
+     * @param connection the XMPP connection.
+     * @return a manager instance.
+     */
+    public static synchronized IoTDiscoveryManager getInstanceFor(XMPPConnection connection) {
+        IoTDiscoveryManager manager = INSTANCES.get(connection);
+        if (manager == null) {
+            manager = new IoTDiscoveryManager(connection);
+            INSTANCES.put(connection, manager);
+        }
+        return manager;
+    }
+
+    private Jid preconfiguredRegistry;
+
+    /**
+     * A set of all registries we have interacted so far. {@link #isRegistry(BareJid)} uses this to
+     * determine if the jid is a registry. Note that we currently do not record which thing
+     * interacted with which registry. This allows any registry we have interacted so far with, to
+     * send registry control stanzas about any other thing, and we would process them.
+     */
+    private final Set<Jid> usedRegistries = new HashSet<>();
+
+    /**
+     * Internal state of the things. Uses <code>null</code> for the single thing without node info attached.
+     */
+    private final Map<NodeInfo, ThingState> things = new HashMap<>();
+
+    private IoTDiscoveryManager(XMPPConnection connection) {
+        super(connection);
+
+        connection.registerIQRequestHandler(
+                        new AbstractIqRequestHandler(IoTClaimed.ELEMENT, IoTClaimed.NAMESPACE, IQ.Type.set, Mode.sync) {
+                            @Override
+                            public IQ handleIQRequest(IQ iqRequest) {
+                                if (!isRegistry(iqRequest.getFrom())) {
+                                    LOGGER.log(Level.SEVERE, "Received control stanza from non-registry entity: " + iqRequest);
+                                    return null;
+                                }
+
+                                IoTClaimed iotClaimed = (IoTClaimed) iqRequest;
+                                Jid owner = iotClaimed.getJid();
+                                NodeInfo nodeInfo = iotClaimed.getNodeInfo();
+                                // Update the state.
+                                ThingState state = getStateFor(nodeInfo);
+                                state.setOwner(owner.asBareJid());
+                                LOGGER.info("Our thing got claimed by " + owner + ". " + iotClaimed);
+
+                                IoTProvisioningManager iotProvisioningManager = IoTProvisioningManager.getInstanceFor(
+                                                connection());
+                                try {
+                                    iotProvisioningManager.sendFriendshipRequest(owner.asBareJid());
+                                }
+                                catch (NotConnectedException | InterruptedException e) {
+                                    LOGGER.log(Level.WARNING, "Could not friendship owner", e);
+                                }
+
+                                return IQ.createResultIQ(iqRequest);
+                            }
+                        });
+
+        connection.registerIQRequestHandler(new AbstractIqRequestHandler(IoTDisowned.ELEMENT, IoTDisowned.NAMESPACE,
+                        IQ.Type.set, Mode.sync) {
+            @Override
+            public IQ handleIQRequest(IQ iqRequest) {
+                if (!isRegistry(iqRequest.getFrom())) {
+                    LOGGER.log(Level.SEVERE, "Received control stanza from non-registry entity: " + iqRequest);
+                    return null;
+                }
+
+                IoTDisowned iotDisowned = (IoTDisowned) iqRequest;
+                Jid from = iqRequest.getFrom();
+
+                NodeInfo nodeInfo = iotDisowned.getNodeInfo();
+                ThingState state = getStateFor(nodeInfo);
+                if (!from.equals(state.getRegistry())) {
+                    LOGGER.severe("Received <disowned/> for " + nodeInfo + " from " + from
+                                    + " but this is not the registry " + state.getRegistry() + " of the thing.");
+                    return null;
+                }
+
+                if (state.isOwned()) {
+                    state.setUnowned();
+                } else {
+                    LOGGER.fine("Received <disowned/> for " + nodeInfo + " but thing was not owned.");
+                }
+
+                return IQ.createResultIQ(iqRequest);
+            }
+        });
+
+        // XEP-0347 § 3.9 (ex28-29): <removed/>
+        connection.registerIQRequestHandler(new AbstractIqRequestHandler(IoTRemoved.ELEMENT, IoTRemoved.NAMESPACE, IQ.Type.set, Mode.async) {
+            @Override
+            public IQ handleIQRequest(IQ iqRequest) {
+                if (!isRegistry(iqRequest.getFrom())) {
+                    LOGGER.log(Level.SEVERE, "Received control stanza from non-registry entity: " + iqRequest);
+                    return null;
+                }
+
+                IoTRemoved iotRemoved = (IoTRemoved) iqRequest;
+
+                ThingState state = getStateFor(iotRemoved.getNodeInfo());
+                state.setRemoved();
+
+                // Unfriend registry. "It does this, so the Thing can remove the friendship and stop any
+                // meta data updates to the Registry."
+                try {
+                    IoTProvisioningManager.getInstanceFor(connection()).unfriend(iotRemoved.getFrom());
+                }
+                catch (NotConnectedException | InterruptedException e) {
+                    LOGGER.log(Level.SEVERE, "Could not unfriend registry after <removed/>", e);
+                }
+
+                return IQ.createResultIQ(iqRequest);
+            }
+        });
+    }
+
+    /**
+     * Try to find an XMPP IoT registry.
+     *
+     * @return the JID of a Thing Registry if one could be found.
+     * @throws InterruptedException
+     * @throws NotConnectedException
+     * @throws XMPPErrorException
+     * @throws NoResponseException
+     * @see <a href="http://xmpp.org/extensions/xep-0347.html#findingregistry">XEP-0347 § 3.5 Finding Thing Registry</a>
+     */
+    public Jid findRegistry()
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        if (preconfiguredRegistry != null) {
+            return preconfiguredRegistry;
+        }
+
+        final XMPPConnection connection = connection();
+        ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
+        List<DiscoverInfo> discoverInfos = sdm.findServicesDiscoverInfo(Constants.IOT_DISCOVERY_NAMESPACE, true, true);
+        if (!discoverInfos.isEmpty()) {
+            return discoverInfos.get(0).getFrom();
+        }
+
+        return null;
+    }
+
+    // Thing Registration - XEP-0347 § 3.6 - 3.8
+
+    public ThingState registerThing(Thing thing)
+                    throws NotConnectedException, InterruptedException, NoResponseException, XMPPErrorException, IoTClaimedException {
+        Jid registry = findRegistry();
+        return registerThing(registry, thing);
+    }
+
+    public ThingState registerThing(Jid registry, Thing thing)
+                    throws NotConnectedException, InterruptedException, NoResponseException, XMPPErrorException, IoTClaimedException {
+        final XMPPConnection connection = connection();
+        IoTRegister iotRegister = new IoTRegister(thing.getMetaTags(), thing.getNodeInfo(), thing.isSelfOwened());
+        iotRegister.setTo(registry);
+        IQ result = connection.createPacketCollectorAndSend(iotRegister).nextResultOrThrow();
+        if (result instanceof IoTClaimed) {
+            IoTClaimed iotClaimedResult = (IoTClaimed) result;
+            throw new IoTClaimedException(iotClaimedResult);
+        }
+
+        ThingState state = getStateFor(thing.getNodeInfo());
+        state.setRegistry(registry.asBareJid());
+
+        interactWithRegistry(registry);
+
+        IoTDataManager.getInstanceFor(connection).installThing(thing);
+        IoTControlManager.getInstanceFor(connection).installThing(thing);
+
+        return state;
+    }
+
+    // Thing Claiming - XEP-0347 § 3.9
+
+    public IoTClaimed claimThing(Collection<Tag> metaTags) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        return claimThing(metaTags, true);
+    }
+
+    public IoTClaimed claimThing(Collection<Tag> metaTags, boolean publicThing) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        Jid registry = findRegistry();
+        return claimThing(registry, metaTags, publicThing);
+    }
+
+    /**
+     * Claim a thing by providing a collection of meta tags. If the claim was successful, then a {@link IoTClaimed}
+     * instance will be returned, which contains the XMPP address of the thing. Use {@link IoTClaimed#getJid()} to
+     * retrieve this address.
+     *
+     * @param registry the registry use to claim the thing.
+     * @param metaTags a collection of meta tags used to identify the thing.
+     * @param publicThing if this is a public thing.
+     * @return a {@link IoTClaimed} if successful.
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     */
+    public IoTClaimed claimThing(Jid registry, Collection<Tag> metaTags, boolean publicThing) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        interactWithRegistry(registry);
+
+        IoTMine iotMine = new IoTMine(metaTags, publicThing);
+        iotMine.setTo(registry);
+        IoTClaimed iotClaimed = connection().createPacketCollectorAndSend(iotMine).nextResultOrThrow();
+
+        // The 'jid' attribute of the <claimed/> response now represents the XMPP address of the thing we just successfully claimed.
+        Jid thing = iotClaimed.getJid();
+
+        IoTProvisioningManager.getInstanceFor(connection()).sendFriendshipRequest(thing.asBareJid());
+
+        return iotClaimed;
+    }
+
+    // Thing Removal - XEP-0347 § 3.10
+
+    public void removeThing(BareJid thing)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        removeThing(thing, NodeInfo.EMPTY);
+    }
+
+    public void removeThing(BareJid thing, NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        Jid registry = findRegistry();
+        removeThing(registry, thing, nodeInfo);
+    }
+
+    public void removeThing(Jid registry, BareJid thing, NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        interactWithRegistry(registry);
+
+        IoTRemove iotRemove = new IoTRemove(thing, nodeInfo);
+        iotRemove.setTo(registry);
+        connection().createPacketCollectorAndSend(iotRemove).nextResultOrThrow();
+
+        // We no not update the ThingState here, as this is done in the <removed/> IQ handler above.;
+    }
+
+    // Thing Unregistering - XEP-0347 § 3.16
+
+    public void unregister()
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        unregister(NodeInfo.EMPTY);
+    }
+
+    public void unregister(NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        Jid registry = findRegistry();
+        unregister(registry, nodeInfo);
+    }
+
+    public void unregister(Jid registry, NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        interactWithRegistry(registry);
+
+        IoTUnregister iotUnregister = new IoTUnregister(nodeInfo);
+        iotUnregister.setTo(registry);
+        connection().createPacketCollectorAndSend(iotUnregister).nextResultOrThrow();
+
+        ThingState state = getStateFor(nodeInfo);
+        state.setUnregistered();
+
+        final XMPPConnection connection = connection();
+        IoTDataManager.getInstanceFor(connection).uninstallThing(nodeInfo);
+        IoTControlManager.getInstanceFor(connection).uninstallThing(nodeInfo);
+    }
+
+    // Thing Disowning - XEP-0347 § 3.17
+
+    public void disownThing(Jid thing)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        disownThing(thing, NodeInfo.EMPTY);
+    }
+
+    public void disownThing(Jid thing, NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        Jid registry = findRegistry();
+        disownThing(registry, thing, nodeInfo);
+    }
+
+    public void disownThing(Jid registry, Jid thing, NodeInfo nodeInfo)
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        interactWithRegistry(registry);
+
+        IoTDisown iotDisown = new IoTDisown(thing, nodeInfo);
+        iotDisown.setTo(registry);
+        connection().createPacketCollectorAndSend(iotDisown).nextResultOrThrow();
+    }
+
+    // Registry utility methods
+
+    public boolean isRegistry(BareJid jid) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        // At some point 'usedRegistries' will also contain the registry returned by findRegistry(), but since this is
+        // not the case from the beginning, we perform findRegistry().equals(jid) too.
+        if (findRegistry().equals(jid)) {
+            return true;
+        }
+        if (usedRegistries.contains(jid)) {
+            return true;
+        }
+        return false;
+    }
+
+    public boolean isRegistry(Jid jid) {
+        try {
+            return isRegistry(jid.asBareJid());
+        }
+        catch (NoResponseException | XMPPErrorException | NotConnectedException
+                        | InterruptedException e) {
+            LOGGER.log(Level.WARNING, "Could not determine if " + jid + " is a registry", e);
+            return false;
+        }
+    }
+
+    private void interactWithRegistry(Jid registry) throws NotConnectedException, InterruptedException {
+        boolean isNew = usedRegistries.add(registry);
+        if (!isNew) {
+            return;
+        }
+        IoTProvisioningManager iotProvisioningManager = IoTProvisioningManager.getInstanceFor(connection());
+        iotProvisioningManager.sendFriendshipRequestIfRequired(registry.asBareJid());
+    }
+
+    public ThingState getStateFor(Thing thing) {
+        return things.get(thing.getNodeInfo());
+    }
+
+    private ThingState getStateFor(NodeInfo nodeInfo) {
+        ThingState state = things.get(nodeInfo);
+        if (state == null) {
+            state = new ThingState(nodeInfo);
+            things.put(nodeInfo, state);
+        }
+        return state;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/ThingState.java

@@ -0,0 +1,95 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+import org.jivesoftware.smack.util.Async;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.BareJid;
+
+public class ThingState {
+
+    private final NodeInfo nodeInfo;
+
+    private BareJid registry;
+    private BareJid owner;
+    private boolean removed;
+
+    private final List<ThingStateChangeListener> listeners = new CopyOnWriteArrayList<>();
+
+    ThingState(NodeInfo nodeInfo) {
+        this.nodeInfo = nodeInfo;
+    }
+
+    void setRegistry(BareJid registry) {
+        this.registry = registry;
+    }
+
+    void setUnregistered() {
+        this.registry = null;
+    }
+
+    void setOwner(final BareJid owner) {
+        this.owner = owner;
+        Async.go(new Runnable() {
+            @Override
+            public void run() {
+                for (ThingStateChangeListener thingStateChangeListener : listeners) {
+                    thingStateChangeListener.owned(owner);
+                }
+            }
+        });
+    }
+
+    void setUnowned() {
+        this.owner = null;
+    }
+
+    void setRemoved() {
+        removed = true;
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    public BareJid getRegistry() {
+        return registry;
+    }
+
+    public BareJid getOwner() {
+        return owner;
+    }
+
+    public boolean isOwned() {
+        return owner != null;
+    }
+
+    public boolean isRemoved() {
+        return removed;
+    }
+
+    public boolean setThingStateChangeListener(ThingStateChangeListener thingStateChangeListener) {
+        return listeners.add(thingStateChangeListener);
+    }
+
+    public boolean removeThingStateChangeListener(ThingStateChangeListener thingStateChangeListener) {
+        return listeners.remove(thingStateChangeListener);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/ThingStateChangeListener.java

@@ -0,0 +1,25 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery;
+
+import org.jxmpp.jid.BareJid;
+
+public interface ThingStateChangeListener {
+
+    public void owned(BareJid owner);
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/Constants.java

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+public class Constants {
+
+    public static final String IOT_DISCOVERY_NAMESPACE = "urn:xmpp:iot:discovery";
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTClaimed.java

@@ -0,0 +1,66 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.Jid;
+
+public class IoTClaimed extends IQ {
+
+    public static final String ELEMENT = "claimed";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final Jid jid;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTClaimed(Jid jid) {
+        this(jid, NodeInfo.EMPTY);
+    }
+
+    public IoTClaimed(Jid jid, NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.jid = jid;
+        this.nodeInfo = nodeInfo;
+    }
+
+    public Jid getJid() {
+        return jid;
+    }
+
+    public String getNodeId() {
+        return nodeInfo.getNodeId();
+    }
+
+    public String getSourceId() {
+        return nodeInfo.getSourceId();
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("jid", jid);
+        nodeInfo.appendTo(xml);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTDisown.java

@@ -0,0 +1,62 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.Jid;
+
+public class IoTDisown extends IQ {
+
+    public static final String ELEMENT = "disown";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final Jid jid;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTDisown(Jid jid) {
+        this(jid, NodeInfo.EMPTY);
+    }
+
+    public IoTDisown(Jid jid, NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.jid = jid;
+        this.nodeInfo = nodeInfo;
+    }
+
+    public Jid getJid() {
+        return jid;
+    }
+
+    public String getNodeId() {
+        return nodeInfo != null ? nodeInfo.getNodeId() : null;
+    }
+
+    public String getSourceId() {
+        return nodeInfo != null ? nodeInfo.getSourceId() : null;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("jid", jid);
+        nodeInfo.appendTo(xml);
+        xml.rightAngleBracket();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTDisowned.java

@@ -0,0 +1,53 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class IoTDisowned extends IQ {
+
+    public static final String ELEMENT = "disown";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTDisowned(NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.nodeInfo = nodeInfo;
+    }
+
+    public String getNodeId() {
+        return nodeInfo.getNodeId();
+    }
+
+    public String getSourceId() {
+        return nodeInfo.getSourceId();
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        nodeInfo.appendTo(xml);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTMine.java

@@ -0,0 +1,52 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.jivesoftware.smack.packet.IQ;
+
+public class IoTMine extends IQ {
+
+    public static final String ELEMENT = "mine";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final List<Tag> metaTags;
+    private final boolean publicThing;
+
+    public IoTMine(Collection<Tag> metaTags, boolean publicThing) {
+        this(new ArrayList<>(metaTags), publicThing);
+    }
+
+    public IoTMine(List<Tag> metaTags, boolean publicThing) {
+        super(ELEMENT, NAMESPACE);
+        this.metaTags = metaTags;
+        this.publicThing = publicThing;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.optBooleanAttributeDefaultTrue("public", publicThing);
+        xml.rightAngleBracket();
+        xml.append(metaTags);
+
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTRegister.java

@@ -0,0 +1,54 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import java.util.Collection;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class IoTRegister extends IQ {
+
+    public static final String ELEMENT = "register";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final Collection<Tag> tags;
+    private final NodeInfo nodeInfo;
+    private final boolean selfOwned;
+
+    public IoTRegister(Collection<Tag> tags, NodeInfo nodeInfo, boolean selfOwned) {
+        super(ELEMENT, NAMESPACE);
+        if (tags.isEmpty()) {
+            throw new IllegalArgumentException();
+        }
+        this.tags = tags;
+        this.nodeInfo = nodeInfo;
+        this.selfOwned = selfOwned;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        nodeInfo.appendTo(xml);
+        xml.optBooleanAttribute("selfOwned", selfOwned);
+        xml.rightAngleBracket();
+
+        xml.append(tags);
+
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTRemove.java

@@ -0,0 +1,67 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.Jid;
+
+public class IoTRemove extends IQ {
+
+    public static final String ELEMENT = "remove";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    /**
+     * The XMPP address of the Thing to be removed from the registry. According to XEP-0347 § 3.10 the
+     * "resource-less JID of the Thing" has to be used, therefore we use {@link BareJid} here.
+     */
+    private final BareJid jid;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTRemove(BareJid jid) {
+        this(jid, NodeInfo.EMPTY);
+    }
+
+    public IoTRemove(BareJid jid, NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.jid = jid;
+        this.nodeInfo = nodeInfo;
+    }
+
+    public Jid getJid() {
+        return jid;
+    }
+
+    public String getNodeId() {
+        return nodeInfo != null ? nodeInfo.getNodeId() : null;
+    }
+
+    public String getSourceId() {
+        return nodeInfo != null ? nodeInfo.getSourceId() : null;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("jid", jid);
+        nodeInfo.appendTo(xml);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTRemoved.java

@@ -0,0 +1,57 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class IoTRemoved extends IQ {
+
+    public static final String ELEMENT = "removed";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTRemoved() {
+        this(NodeInfo.EMPTY);
+    }
+
+    public IoTRemoved(NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.nodeInfo = nodeInfo;
+    }
+
+    public String getNodeId() {
+        return nodeInfo.getNodeId();
+    }
+
+    public String getSourceId() {
+        return nodeInfo.getSourceId();
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        nodeInfo.appendTo(xml);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/IoTUnregister.java

@@ -0,0 +1,41 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+
+public class IoTUnregister extends IQ {
+
+    public static final String ELEMENT = "unregister";
+    public static final String NAMESPACE = Constants.IOT_DISCOVERY_NAMESPACE;
+
+    private final NodeInfo nodeInfo;
+
+    public IoTUnregister(NodeInfo nodeInfo) {
+        super(ELEMENT, NAMESPACE);
+        this.nodeInfo = nodeInfo;
+        setType(Type.set);
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        nodeInfo.appendTo(xml);
+        xml.rightAngleBracket();
+        return xml;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/Tag.java

@@ -0,0 +1,78 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;
+
+import org.jivesoftware.smack.packet.NamedElement;
+import org.jivesoftware.smack.util.Objects;
+import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+public class Tag implements NamedElement {
+
+    public enum Type {
+        str,
+        num;
+    }
+
+    private final String name;
+    private final Type type;
+    private final String value;
+
+    public Tag(String name, Type type, String value) {
+        // TODO According to XEP-0347 § 5.2 names are case insensitive. Uppercase them all?
+        this.name = StringUtils.requireNotNullOrEmpty(name, "name must not be null or empty");
+        this.type = Objects.requireNonNull(type);
+        this.value =  StringUtils.requireNotNullOrEmpty(value, "value must not be null or empty");
+        if (this.name.length() > 32) {
+            throw new IllegalArgumentException("Meta Tag names must not be longer then 32 characters (XEP-0347 § 5.2");
+        }
+        if (this.type == Type.str && this.value.length() > 128) {
+            throw new IllegalArgumentException("Meta Tag string values must not be longer then 128 characters (XEP-0347 § 5.2");
+        }
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("name", name);
+        xml.attribute("value", value);
+        xml.closeEmptyElement();
+        return xml;
+    }
+
+    @Override
+    public String getElementName() {
+        return getType().toString();
+    }
+
+    @Override
+    public String toString() {
+        return name + '(' + type + "):" + value;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/element/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.discovery.element;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT XEP-0347 Discovery. See {@link org.jivesoftware.smackx.iot.discovery.IoTDiscoveryManager}.
+ */
+package org.jivesoftware.smackx.iot.discovery;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTClaimedProvider.java

@@ -0,0 +1,36 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.discovery.element.IoTClaimed;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.jxmpp.jid.Jid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTClaimedProvider extends IQProvider<IoTClaimed> {
+
+    @Override
+    public IoTClaimed parse(XmlPullParser parser, int initialDepth) throws Exception {
+        Jid jid = ParserUtils.getJidAttribute(parser);
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTClaimed(jid, nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTDisownProvider.java

@@ -0,0 +1,36 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.discovery.element.IoTDisown;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.jxmpp.jid.Jid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTDisownProvider extends IQProvider<IoTDisown> {
+
+    @Override
+    public IoTDisown parse(XmlPullParser parser, int initialDepth) throws Exception {
+        Jid jid = ParserUtils.getJidAttribute(parser);
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTDisown(jid, nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTDisownedProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smackx.iot.discovery.element.IoTDisowned;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTDisownedProvider extends IQProvider<IoTDisowned> {
+
+    @Override
+    public IoTDisowned parse(XmlPullParser parser, int initialDepth) throws Exception {
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTDisowned(nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTRegisterProvider.java

@@ -0,0 +1,62 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRegister;
+import org.jivesoftware.smackx.iot.discovery.element.Tag;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTRegisterProvider extends IQProvider<IoTRegister> {
+
+    @Override
+    public IoTRegister parse(XmlPullParser parser, int initialDepth) throws Exception {
+        boolean selfOwned = ParserUtils.getBooleanAttribute(parser, "selfOwned", false);
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        List<Tag> tags = new ArrayList<>();
+        while (parser.getDepth() != initialDepth) {
+            int event = parser.next();
+            if (event != XmlPullParser.START_TAG) {
+                continue;
+            }
+            final String element = parser.getName();
+            Tag.Type type = null;
+            switch (element) {
+            case "str":
+                type = Tag.Type.str;
+                break;
+            case "num":
+                type = Tag.Type.num;
+                break;
+            }
+            if (type == null) {
+                continue;
+            }
+            String name = parser.getAttributeValue(null, "name");
+            String value = parser.getAttributeValue(null, "value");
+            tags.add(new Tag(name, type, value));
+        }
+        return new IoTRegister(tags, nodeInfo, selfOwned);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTRemoveProvider.java

@@ -0,0 +1,42 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.SmackException;
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRemove;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.Jid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTRemoveProvider extends IQProvider<IoTRemove> {
+
+    @Override
+    public IoTRemove parse(XmlPullParser parser, int initialDepth) throws Exception {
+        Jid jid = ParserUtils.getJidAttribute(parser);
+        if (jid.hasResource()) {
+            throw new SmackException("JID must be without resourcepart");
+        }
+        BareJid bareJid = jid.asBareJid();
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTRemove(bareJid, nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTRemovedProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smackx.iot.discovery.element.IoTRemoved;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTRemovedProvider extends IQProvider<IoTRemoved> {
+
+    @Override
+    public IoTRemoved parse(XmlPullParser parser, int initialDepth) throws Exception {
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTRemoved(nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/IoTUnregisterProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smackx.iot.discovery.element.IoTUnregister;
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.jivesoftware.smackx.iot.parser.NodeInfoParser;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTUnregisterProvider extends IQProvider<IoTUnregister> {
+
+    @Override
+    public IoTUnregister parse(XmlPullParser parser, int initialDepth) throws Exception {
+        NodeInfo nodeInfo = NodeInfoParser.parse(parser);
+        return new IoTUnregister(nodeInfo);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/discovery/provider/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.discovery.provider;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/element/NodeInfo.java

@@ -0,0 +1,105 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.element;
+
+import org.jivesoftware.smack.util.StringUtils;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+
+public final class NodeInfo {
+
+    public static final NodeInfo EMPTY = new NodeInfo();
+
+    private final String nodeId;
+    private final String sourceId;
+    private final String cacheType;
+
+    /**
+     * The internal constructor for the {@link EMPTY} node info marker class.
+     */
+    private NodeInfo() {
+        this.nodeId = null;
+        this.sourceId = null;
+        this.cacheType = null;
+    }
+
+    public NodeInfo(String nodeId, String sourceId, String cacheType) {
+        this.nodeId = StringUtils.requireNotNullOrEmpty(nodeId, "Node ID must not be null or empty");
+        this.sourceId = sourceId;
+        this.cacheType = cacheType;
+    }
+
+    public String getNodeId() {
+        return nodeId;
+    }
+
+    public String getSourceId() {
+        return sourceId;
+    }
+
+    public String getCacheType() {
+        return cacheType;
+    }
+
+    public void appendTo(XmlStringBuilder xml) {
+        if (nodeId == null) {
+            return;
+        }
+        xml.attribute("nodeId", nodeId).optAttribute("sourceId", sourceId).optAttribute("cacheType", cacheType);
+    }
+
+    @Override
+    public int hashCode() {
+        if (this == EMPTY) {
+            return 0;
+        }
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + nodeId.hashCode();
+        result = prime * result + ((sourceId == null) ? 0 : sourceId.hashCode());
+        result = prime * result + ((cacheType == null) ? 0 : cacheType.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+        if (other == null) {
+            return false;
+        }
+        if (!(other instanceof NodeInfo)) {
+            return false;
+        }
+        NodeInfo otherNodeInfo = (NodeInfo) other;
+        if (!nodeId.equals(otherNodeInfo.nodeId)) {
+            return false;
+        }
+        if (StringUtils.nullSafeCharSequenceEquals(sourceId, otherNodeInfo.sourceId)
+                        && StringUtils.nullSafeCharSequenceEquals(cacheType, otherNodeInfo.cacheType)) {
+            return true;
+        }
+        return false;
+    }
+
+//    public static void eventuallyAppend(NodeInfo nodeInfo, XmlStringBuilder xml) {
+//        if (nodeInfo == null)
+//            return;
+//
+//        nodeInfo.appendTo(xml);
+//    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/element/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.element;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/parser/NodeInfoParser.java

@@ -0,0 +1,35 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.parser;
+
+import org.jivesoftware.smackx.iot.element.NodeInfo;
+import org.xmlpull.v1.XmlPullParser;
+
+import static org.jivesoftware.smack.util.StringUtils.isNullOrEmpty;
+
+public class NodeInfoParser {
+
+    public static NodeInfo parse(XmlPullParser parser) {
+        String nodeId = parser.getAttributeValue(null, "nodeId");
+        String sourceId = parser.getAttributeValue(null, "sourceId");
+        String cacheType = parser.getAttributeValue(null, "cacheType");
+        if (isNullOrEmpty(nodeId) && isNullOrEmpty(sourceId) && isNullOrEmpty(cacheType)) {
+            return NodeInfo.EMPTY;
+        }
+        return new NodeInfo(nodeId, sourceId, cacheType);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/parser/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.parser;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/IoTProvisioningManager.java

@@ -0,0 +1,319 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning;
+
+import java.util.List;
+import java.util.Map;
+import java.util.WeakHashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.Manager;
+import org.jivesoftware.smack.SmackException.NoResponseException;
+import org.jivesoftware.smack.SmackException.NotConnectedException;
+import org.jivesoftware.smack.StanzaListener;
+import org.jivesoftware.smack.XMPPConnection;
+import org.jivesoftware.smack.XMPPConnectionRegistry;
+import org.jivesoftware.smack.XMPPException.XMPPErrorException;
+import org.jivesoftware.smack.filter.AndFilter;
+import org.jivesoftware.smack.filter.StanzaExtensionFilter;
+import org.jivesoftware.smack.filter.StanzaFilter;
+import org.jivesoftware.smack.filter.StanzaTypeFilter;
+import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
+import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
+import org.jivesoftware.smack.packet.IQ;
+import org.jivesoftware.smack.packet.IQ.Type;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.packet.Presence;
+import org.jivesoftware.smack.packet.Stanza;
+import org.jivesoftware.smack.roster.Roster;
+import org.jivesoftware.smack.roster.RosterEntry;
+import org.jivesoftware.smack.roster.SubscribeListener;
+import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
+import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
+import org.jivesoftware.smackx.iot.discovery.IoTDiscoveryManager;
+import org.jivesoftware.smackx.iot.provisioning.element.ClearCache;
+import org.jivesoftware.smackx.iot.provisioning.element.ClearCacheResponse;
+import org.jivesoftware.smackx.iot.provisioning.element.Constants;
+import org.jivesoftware.smackx.iot.provisioning.element.IoTIsFriend;
+import org.jivesoftware.smackx.iot.provisioning.element.IoTIsFriendResponse;
+import org.jivesoftware.smackx.iot.provisioning.element.Unfriend;
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.DomainBareJid;
+import org.jxmpp.jid.Jid;
+import org.jxmpp.util.cache.LruCache;
+
+/**
+ * A manager for XEP-0324: Internet of Things - Provisioning.
+ *
+ * @author Florian Schmaus {@literal <flo@geekplace.eu>}
+ * @see <a href="http://xmpp.org/extensions/xep-0324.html">XEP-0324: Internet of Things - Provisioning</a>
+ */
+public final class IoTProvisioningManager extends Manager {
+
+    private static final Logger LOGGER = Logger.getLogger(IoTProvisioningManager.class.getName());
+
+    private static final StanzaFilter UNFRIEND_MESSAGE = new AndFilter(StanzaTypeFilter.MESSAGE,
+                    new StanzaExtensionFilter(Unfriend.ELEMENT, Unfriend.NAMESPACE));
+
+    private static final Map<XMPPConnection, IoTProvisioningManager> INSTANCES = new WeakHashMap<>();
+
+    // Ensure a IoTProvisioningManager exists for every connection.
+    static {
+        XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
+            public void connectionCreated(XMPPConnection connection) {
+                getInstanceFor(connection);
+            }
+        });
+    }
+
+    /**
+     * Get the manger instance responsible for the given connection.
+     *
+     * @param connection the XMPP connection.
+     * @return a manager instance.
+     */
+    public static synchronized IoTProvisioningManager getInstanceFor(XMPPConnection connection) {
+        IoTProvisioningManager manager = INSTANCES.get(connection);
+        if (manager == null) {
+            manager = new IoTProvisioningManager(connection);
+            INSTANCES.put(connection, manager);
+        }
+        return manager;
+    }
+
+    private final Roster roster;
+    private final LruCache<Jid, LruCache<BareJid, Void>> negativeFriendshipRequestCache = new LruCache<>(8);
+
+    private Jid configuredProvisioningServer;
+
+    private IoTProvisioningManager(XMPPConnection connection) {
+        super(connection);
+
+        // Stanza listener for XEP-0324 § 3.2.3.
+        connection.addAsyncStanzaListener(new StanzaListener() {
+            @Override
+            public void processPacket(Stanza stanza) throws NotConnectedException, InterruptedException {
+                if (!isFromProvisioningService(stanza)) {
+                    return;
+                }
+
+                Message message = (Message) stanza;
+                Unfriend unfriend = Unfriend.from(message);
+                BareJid unfriendJid = unfriend.getJid();
+                final XMPPConnection connection = connection();
+                Roster roster = Roster.getInstanceFor(connection);
+                if (!roster.isSubscribedToMyPresence(unfriendJid)) {
+                    LOGGER.warning("Ignoring <unfriend/> request '" + stanza + "' because " + unfriendJid
+                                    + " is already not subscribed to our presence.");
+                    return;
+                }
+                Presence unsubscribed = new Presence(Presence.Type.unsubscribed);
+                unsubscribed.setTo(unfriendJid);
+                connection.sendStanza(unsubscribed);
+            }
+        }, UNFRIEND_MESSAGE);
+
+        connection.registerIQRequestHandler(
+                        new AbstractIqRequestHandler(ClearCache.ELEMENT, ClearCache.NAMESPACE, Type.set, Mode.async) {
+                            @Override
+                            public IQ handleIQRequest(IQ iqRequest) {
+                                if (!isFromProvisioningService(iqRequest)) {
+                                    return null;
+                                }
+
+                                ClearCache clearCache = (ClearCache) iqRequest;
+
+                                // Handle <clearCache/> request.
+                                Jid from = iqRequest.getFrom();
+                                LruCache<BareJid, Void> cache = negativeFriendshipRequestCache.get(from);
+                                if (cache != null) {
+                                    cache.clear();
+                                }
+
+                                return new ClearCacheResponse(clearCache);
+                            }
+                        });
+
+        roster = Roster.getInstanceFor(connection);
+        roster.setSubscribeListener(new SubscribeListener() {
+            @Override
+            public SubscribeAnswer processSubscribe(Jid from, Presence subscribeRequest) {
+                // First check if the subscription request comes from a known registry and accept the request if so.
+                try {
+                    if (IoTDiscoveryManager.getInstanceFor(connection()).isRegistry(from.asBareJid())) {
+                        return SubscribeAnswer.Approve;
+                    }
+                }
+                catch (NoResponseException | XMPPErrorException | NotConnectedException | InterruptedException e) {
+                    LOGGER.log(Level.WARNING, "Could not determine if " + from + " is a registry", e);
+                }
+
+                Jid provisioningServer = null;
+                try {
+                    provisioningServer = getConfiguredProvisioningServer();
+                }
+                catch (NoResponseException | XMPPErrorException | NotConnectedException | InterruptedException e) {
+                    LOGGER.log(Level.WARNING,
+                                    "Could not determine privisioning server. Ignoring friend request from " + from, e);
+                }
+                if (provisioningServer == null) {
+                    return null;
+                }
+
+                boolean isFriend;
+                try {
+                    isFriend = isFriend(provisioningServer, from.asBareJid());
+                }
+                catch (NoResponseException | XMPPErrorException | NotConnectedException | InterruptedException e) {
+                    LOGGER.log(Level.WARNING, "Could not determine if " + from + " is a friend.", e);
+                    return null;
+                }
+
+                if (isFriend) {
+                    return SubscribeAnswer.Approve;
+                }
+                else {
+                    return SubscribeAnswer.Deny;
+                }
+            }
+        });
+    }
+
+    /**
+     * Set the configured provisioning server. Use <code>null</code> as provisioningServer to use
+     * automatic discovery of the provisioning server (the default behavior).
+     * 
+     * @param provisioningServer
+     */
+    public void setConfiguredProvisioningServer(Jid provisioningServer) {
+        this.configuredProvisioningServer = provisioningServer;
+    }
+
+    public Jid getConfiguredProvisioningServer()
+                    throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        if (configuredProvisioningServer == null) {
+            configuredProvisioningServer = findProvisioningServerComponent();
+        }
+        return configuredProvisioningServer;
+    }
+
+    /**
+     * Try to find a provisioning server component.
+     * 
+     * @return the XMPP address of the provisioning server component if one was found.
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     * @see <a href="http://xmpp.org/extensions/xep-0324.html#servercomponent">XEP-0324 § 3.1.2 Provisioning Server as a server component</a>
+     */
+    public DomainBareJid findProvisioningServerComponent() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        final XMPPConnection connection = connection();
+        ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
+        List<DiscoverInfo> discoverInfos = sdm.findServicesDiscoverInfo(Constants.IOT_PROVISIONING_NAMESPACE, true, true);
+        if (discoverInfos.isEmpty()) {
+            return null;
+        }
+        Jid jid = discoverInfos.get(0).getFrom();
+        assert (jid.isDomainBareJid());
+        return jid.asDomainBareJid();
+    }
+
+    /**
+     * As the given provisioning server is the given JID is a friend.
+     *
+     * @param provisioningServer the provisioning server to ask.
+     * @param friendInQuestion the JID to ask about.
+     * @return <code>true</code> if the JID is a friend, <code>false</code> otherwise.
+     * @throws NoResponseException
+     * @throws XMPPErrorException
+     * @throws NotConnectedException
+     * @throws InterruptedException
+     */
+    public boolean isFriend(Jid provisioningServer, BareJid friendInQuestion) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+        LruCache<BareJid, Void> cache = negativeFriendshipRequestCache.get(provisioningServer);
+        if (cache != null && cache.containsKey(friendInQuestion)) {
+            // We hit a cached negative isFriend response for this provisioning server.
+            return false;
+        }
+
+        IoTIsFriend iotIsFriend = new IoTIsFriend(friendInQuestion);
+        iotIsFriend.setTo(provisioningServer);
+        IoTIsFriendResponse response = connection().createPacketCollectorAndSend(iotIsFriend).nextResultOrThrow();
+        assert (response.getJid().equals(friendInQuestion));
+        boolean isFriend = response.getIsFriendResult();
+        if (!isFriend) {
+            // Cache the negative is friend response.
+            if (cache == null) {
+                cache = new LruCache<>(1024);
+                negativeFriendshipRequestCache.put(provisioningServer, cache);
+            }
+            cache.put(friendInQuestion, null);
+        }
+        return isFriend;
+    }
+
+    public void sendFriendshipRequest(BareJid bareJid) throws NotConnectedException, InterruptedException {
+        Presence presence = new Presence(Presence.Type.subscribe);
+        presence.setTo(bareJid);
+        connection().sendStanza(presence);
+    }
+
+    public void sendFriendshipRequestIfRequired(BareJid jid) throws NotConnectedException, InterruptedException {
+        RosterEntry entry = roster.getEntry(jid);
+        if (entry != null && entry.canSeeHisPresence()) {
+            return;
+        }
+        sendFriendshipRequest(jid);
+    }
+
+    public boolean isBefriended(Jid friendInQuestion) {
+        return roster.isSubscribedToMyPresence(friendInQuestion);
+    }
+
+    public void unfriend(Jid friend) throws NotConnectedException, InterruptedException {
+        if (isBefriended(friend)) {
+            Presence presence = new Presence(Presence.Type.unsubscribed);
+            presence.setTo(friend);
+            connection().sendStanza(presence);
+        }
+    }
+
+    private boolean isFromProvisioningService(Stanza stanza) {
+        Jid provisioningServer;
+        try {
+            provisioningServer = getConfiguredProvisioningServer();
+        }
+        catch (NotConnectedException | InterruptedException | NoResponseException | XMPPErrorException e) {
+            LOGGER.log(Level.WARNING, "Could determine provisioning server", e);
+            return false;
+        }
+        if (provisioningServer == null) {
+            LOGGER.warning("Ignoring request '" + stanza
+                            + "' because no provisioning server configured.");
+            return false;
+        }
+        if (!provisioningServer.equals(stanza.getFrom())) {
+            LOGGER.warning("Ignoring  request '" + stanza + "' because not from provising server '"
+                            + provisioningServer + "'.");
+            return false;
+        }
+        return true;
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/ClearCache.java

@@ -0,0 +1,32 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+import org.jivesoftware.smack.packet.SimpleIQ;
+
+public class ClearCache extends SimpleIQ {
+
+    public static final String ELEMENT = "clearCache";
+    public static final String NAMESPACE = Constants.IOT_PROVISIONING_NAMESPACE;
+
+    public ClearCache() {
+        super(ELEMENT, NAMESPACE);
+        // <clearCache/> IQs are always of type 'get' (XEP-0324 § 3.5.1, see also the XEPs history remarks)
+        setType(Type.get);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/ClearCacheResponse.java

@@ -0,0 +1,37 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+import org.jivesoftware.smack.packet.SimpleIQ;
+
+public class ClearCacheResponse extends SimpleIQ {
+
+    public static final String ELEMENT = "clearCacheResponse";
+    public static final String NAMESPACE = Constants.IOT_PROVISIONING_NAMESPACE;
+
+    public ClearCacheResponse() {
+        super(ELEMENT, NAMESPACE);
+        // <clearCacheResponse/> IQs are always of type 'result' (XEP-0324 § 3.5.1, see also the XEPs history remarks)
+        setType(Type.result);
+    }
+
+    public ClearCacheResponse(ClearCache clearCacheRequest) {
+        this();
+        setStanzaId(clearCacheRequest.getStanzaId());
+        setTo(clearCacheRequest.getFrom());
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/Constants.java

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+public class Constants {
+
+    public static final String IOT_PROVISIONING_NAMESPACE = "urn:xmpp:iot:provisioning";
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/IoTIsFriend.java

@@ -0,0 +1,41 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jxmpp.jid.Jid;
+
+public class IoTIsFriend extends IQ {
+
+    public static final String ELEMENT = "isFriend";
+    public static final String NAMESPACE = Constants.IOT_PROVISIONING_NAMESPACE;
+
+    private final Jid jid;
+
+    public IoTIsFriend(Jid jid) {
+        super(ELEMENT, NAMESPACE);
+        this.jid = jid;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("jid", jid);
+        xml.setEmptyElement();
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/IoTIsFriendResponse.java

@@ -0,0 +1,52 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+import org.jivesoftware.smack.packet.IQ;
+import org.jxmpp.jid.BareJid;
+
+public class IoTIsFriendResponse extends IQ {
+
+    public static final String ELEMENT = "isFriend";
+    public static final String NAMESPACE = Constants.IOT_PROVISIONING_NAMESPACE;
+
+    private final BareJid jid;
+
+    private final boolean result;
+
+    public IoTIsFriendResponse(BareJid jid, boolean result) {
+        super(ELEMENT, NAMESPACE);
+        this.jid = jid;
+        this.result = result;
+    }
+
+    public BareJid getJid() {
+        return jid;
+    }
+
+    public boolean getIsFriendResult() {
+        return result;
+    }
+
+    @Override
+    protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
+        xml.attribute("jid", jid);
+        xml.attribute("result", result);
+        return xml;
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/Unfriend.java

@@ -0,0 +1,59 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;
+
+import org.jivesoftware.smack.packet.ExtensionElement;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.util.XmlStringBuilder;
+import org.jxmpp.jid.BareJid;
+
+public class Unfriend implements ExtensionElement {
+    public static final String ELEMENT = "UNFRIEND";
+    public static final String NAMESPACE = Constants.IOT_PROVISIONING_NAMESPACE;
+
+    private final BareJid jid;
+
+    public Unfriend(BareJid jid) {
+        this.jid = jid;
+    }
+
+    public BareJid getJid() {
+        return jid;
+    }
+
+    @Override
+    public String getElementName() {
+        return ELEMENT;
+    }
+
+    @Override
+    public String getNamespace() {
+        return NAMESPACE;
+    }
+
+    @Override
+    public XmlStringBuilder toXML() {
+        XmlStringBuilder xml = new XmlStringBuilder(this);
+        xml.attribute("jid", jid);
+        xml.closeEmptyElement();
+        return xml;
+    }
+
+    public static Unfriend from(Message message) {
+        return message.getExtension(ELEMENT, NAMESPACE);
+    }
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/element/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.provisioning.element;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.provisioning;

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/ClearCacheProvider.java

@@ -0,0 +1,31 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+
+import org.jivesoftware.smackx.iot.provisioning.element.ClearCache;
+import org.xmlpull.v1.XmlPullParser;
+
+public class ClearCacheProvider extends IQProvider<ClearCache> {
+
+    @Override
+    public ClearCache parse(XmlPullParser parser, int initialDepth) throws Exception {
+        return new ClearCache();
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/ClearCacheResponseProvider.java

@@ -0,0 +1,31 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+
+import org.jivesoftware.smackx.iot.provisioning.element.ClearCacheResponse;
+import org.xmlpull.v1.XmlPullParser;
+
+public class ClearCacheResponseProvider extends IQProvider<ClearCacheResponse> {
+
+    @Override
+    public ClearCacheResponse parse(XmlPullParser parser, int initialDepth) throws Exception {
+        return new ClearCacheResponse();
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/IoTIsFriendProvider.java

@@ -0,0 +1,34 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.provisioning.element.IoTIsFriend;
+import org.jxmpp.jid.Jid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTIsFriendProvider extends IQProvider<IoTIsFriend> {
+
+    @Override
+    public IoTIsFriend parse(XmlPullParser parser, int initialDepth) throws Exception {
+        Jid jid = ParserUtils.getJidAttribute(parser);
+        return new IoTIsFriend(jid);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/IoTIsFriendResponseProvider.java

@@ -0,0 +1,37 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;
+
+import org.jivesoftware.smack.provider.IQProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.provisioning.element.IoTIsFriendResponse;
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.Jid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class IoTIsFriendResponseProvider extends IQProvider<IoTIsFriendResponse> {
+
+    @Override
+    public IoTIsFriendResponse parse(XmlPullParser parser, int initialDepth) throws Exception {
+        Jid jid = ParserUtils.getJidAttribute(parser);
+        BareJid bareJid = jid.asBareJid();
+        boolean result = ParserUtils.getBooleanAttribute(parser, "result");
+
+        return new IoTIsFriendResponse(bareJid, result);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/UnfriendProvider.java

@@ -0,0 +1,33 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;
+
+import org.jivesoftware.smack.provider.ExtensionElementProvider;
+import org.jivesoftware.smack.util.ParserUtils;
+import org.jivesoftware.smackx.iot.provisioning.element.Unfriend;
+import org.jxmpp.jid.BareJid;
+import org.xmlpull.v1.XmlPullParser;
+
+public class UnfriendProvider extends ExtensionElementProvider<Unfriend> {
+
+    @Override
+    public Unfriend parse(XmlPullParser parser, int initialDepth) throws Exception {
+        BareJid jid = ParserUtils.getBareJidAttribute(parser);
+        return new Unfriend(jid);
+    }
+
+}

smack-experimental/src/main/java/org/jivesoftware/smackx/iot/provisioning/provider/package-info.java

@@ -0,0 +1,21 @@
+/**
+ *
+ * Copyright © 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Smack's API for XMPP IoT.
+ */
+package org.jivesoftware.smackx.iot.provisioning.provider;

smack-experimental/src/main/resources/org.jivesoftware.smack.experimental/experimental.providers

@@ -52,4 +52,97 @@
         <className>org.jivesoftware.smackx.gcm.provider.GcmExtensionProvider</className>
     </extensionProvider>
 
+    <!-- XEP-0347: Internet of Things - Discovery -->
+    <iqProvider>
+      <elementName>register</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTRegisterProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>claimed</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTClaimedProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>disown</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTDisownProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>disowned</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTDisownedProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>remove</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTRemoveProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>disown</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTRemovedProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>unregister</elementName>
+      <namespace>urn:xmpp:iot:discovery</namespace>
+      <className>org.jivesoftware.smackx.iot.discovery.provider.IoTUnregisterProvider</className>
+    </iqProvider>
+
+    <!-- XEP-0324: Internet of Things - Provisioning -->
+   <iqProvider>
+      <elementName>isFriend</elementName>
+      <namespace>urn:xmpp:iot:provisioning</namespace>
+      <className>org.jivesoftware.smackx.iot.provisioning.provider.IoTIsFriendProvider</className>
+    </iqProvider>
+   <iqProvider>
+      <elementName>isFriendResponse</elementName>
+      <namespace>urn:xmpp:iot:provisioning</namespace>
+      <className>org.jivesoftware.smackx.iot.provisioning.provider.IoTIsFriendResponseProvider</className>
+    </iqProvider>
+   <iqProvider>
+      <elementName>clearCache</elementName>
+      <namespace>urn:xmpp:iot:provisioning</namespace>
+      <className>org.jivesoftware.smackx.iot.provisioning.provider.ClearCacheProvider</className>
+    </iqProvider>
+   <iqProvider>
+      <elementName>clearCacheResponse</elementName>
+      <namespace>urn:xmpp:iot:provisioning</namespace>
+      <className>org.jivesoftware.smackx.iot.provisioning.provider.ClearCacheResponseProvider</className>
+    </iqProvider>
+    <extensionProvider>
+        <elementName>unfriend</elementName>
+        <namespace>urn:xmpp:iot:provisioning</namespace>
+        <className>org.jivesoftware.smackx.iot.provisioning.provider.UnfriendProvider</className>
+    </extensionProvider>
+
+    <!-- XEP-0323: Internet of Things - Data -->
+    <iqProvider>
+      <elementName>req</elementName>
+      <namespace>urn:xmpp:iot:data</namespace>
+      <className>org.jivesoftware.smackx.iot.data.provider.IoTDataRequestProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>accepted</elementName>
+      <namespace>urn:xmpp:iot:data</namespace>
+      <className>org.jivesoftware.smackx.iot.data.provider.IoTDataReadOutAcceptedProvider</className>
+    </iqProvider>
+    <extensionProvider>
+      <elementName>fields</elementName>
+      <namespace>urn:xmpp:iot:data</namespace>
+      <className>org.jivesoftware.smackx.iot.data.provider.IoTFieldsExtensionProvider</className>
+    </extensionProvider>
+
+    <!-- XEP-0325: Internet of Things - Control -->
+    <iqProvider>
+      <elementName>set</elementName>
+      <namespace>urn:xmpp:iot:control</namespace>
+      <className>org.jivesoftware.smackx.iot.control.provider.IoTSetRequestProvider</className>
+    </iqProvider>
+    <iqProvider>
+      <elementName>setResponse</elementName>
+      <namespace>urn:xmpp:iot:control</namespace>
+      <className>org.jivesoftware.smackx.iot.control.provider.IoTSetResponseProvider</className>
+    </iqProvider>
+
 </smackProviders>

smack-experimental/src/main/resources/org.jivesoftware.smack.experimental/experimental.xml

@@ -1,5 +1,8 @@
 <smack>
     <startupClasses>
         <className>org.jivesoftware.smackx.hoxt.HOXTManager</className>
+        <className>org.jivesoftware.smackx.iot.data.IoTDataManager</className>
+        <className>org.jivesoftware.smackx.iot.discovery.IoTDiscoveryManager</className>
+        <className>org.jivesoftware.smackx.iot.provisioning.IoTProvisioningManager</className>
     </startupClasses>
-</smack>
+</smack>

smack-im/src/main/java/org/jivesoftware/smack/roster/Roster.java

@@ -1074,13 +1074,7 @@ public final class Roster extends Manager {
         if (entry == null) {
             return false;
         }
-        switch (entry.getType()) {
+        return entry.canSeeMyPresence();
-        case from:
-        case both:
-            return true;
-        default:
-            return false;
-        }
     }
 
     /**

smack-im/src/main/java/org/jivesoftware/smack/roster/RosterEntry.java

@@ -176,6 +176,39 @@ public final class RosterEntry extends Manager {
         return item.isSubscriptionPending();
     }
 
+    /**
+     * Check if the contact is subscribed to "my" presence. This allows the contact to see the presence information.
+     *
+     * @return true if the contact has a presence subscription.
+     * @since 4.2
+     */
+    public boolean canSeeMyPresence() {
+        switch (getType()) {
+        case from:
+        case both:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    /**
+     * Check if we are subscribed to the contact's presence. If <code>true</code> then the contact has allowed us to
+     * receive presence information.
+     *
+     * @return true if we are subscribed to the contact's presence.
+     * @since 4.2
+     */
+    public boolean canSeeHisPresence() {
+        switch (getType()) {
+        case to:
+        case both:
+            return true;
+        default:
+            return false;
+        }
+    }
+
     public String toString() {
         StringBuilder buf = new StringBuilder();
         if (getName() != null) {

smack-im/src/main/java/org/jivesoftware/smack/roster/RosterUtil.java

@@ -0,0 +1,83 @@
+/**
+ *
+ * Copyright 2016 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.roster;
+
+import java.util.Collection;
+import java.util.Date;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.jxmpp.jid.BareJid;
+import org.jxmpp.jid.Jid;
+
+public class RosterUtil {
+
+    public static void waitUntilOtherEntityIsSubscribed(Roster roster, BareJid otherEntity, long timeoutMillis)
+                    throws InterruptedException, TimeoutException {
+        Date deadline = new Date(System.currentTimeMillis() + timeoutMillis);
+        waitUntilOtherEntityIsSubscribed(roster, otherEntity, deadline);
+    }
+
+    public static void waitUntilOtherEntityIsSubscribed(Roster roster, final BareJid otherEntity, Date deadline)
+                    throws InterruptedException, TimeoutException {
+        final Lock lock = new ReentrantLock();
+        final Condition maybeSubscribed = lock.newCondition();
+        RosterListener rosterListener = new AbstractRosterListener() {
+            private void signal() {
+                lock.lock();
+                try {
+                    // No need to use signalAll() here.
+                    maybeSubscribed.signal();
+                }
+                finally {
+                    lock.unlock();
+                }
+            }
+
+            @Override
+            public void entriesAdded(Collection<Jid> addresses) {
+                signal();
+            }
+
+            @Override
+            public void entriesUpdated(Collection<Jid> addresses) {
+                signal();
+            }
+        };
+
+        roster.addRosterListener(rosterListener);
+
+        boolean stillWaiting = true;
+        // Using the example code pattern from Condition.awaitUntil(Date) javadoc.
+        lock.lock();
+        try {
+            while (!roster.isSubscribedToMyPresence(otherEntity)) {
+                if (!stillWaiting) {
+                    throw new TimeoutException();
+                }
+                stillWaiting = maybeSubscribed.awaitUntil(deadline);
+            }
+        }
+        finally {
+            lock.unlock();
+            // Make sure the listener is removed, so we don't leak it.
+            roster.removeRosterListener(rosterListener);
+        }
+    }
+}

smack-integration-test/build.gradle

@@ -10,6 +10,7 @@ dependencies {
 	compile project(':smack-java7')
 	compile project(':smack-tcp')
 	compile project(':smack-extensions')
+	compile project(':smack-experimental')
 	compile 'org.reflections:reflections:0.9.9-RC1'
 	compile 'eu.geekplace.javapinning:java-pinning-java7:1.1.0-alpha1'
 	compile "junit:junit:$junitVersion"

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/AbstractSmackIntTest.java

@@ -16,10 +16,13 @@
  */
 package org.igniterealtime.smack.inttest;
 
+import java.util.Random;
 import java.util.logging.Logger;
 
 public abstract class AbstractSmackIntTest {
 
     protected static final Logger LOGGER = Logger.getLogger(AbstractSmackIntTest.class.getName());
 
+    protected static final Random INSECURE_RANDOM = new Random();
+
 }

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/AbstractSmackIntegrationTest.java

@@ -30,6 +30,11 @@ public abstract class AbstractSmackIntegrationTest extends AbstractSmackIntTest
      */
     protected final XMPPConnection conTwo;
 
+    /**
+     * The third connection.
+     */
+    protected final XMPPConnection conThree;
+
     /**
      * An alias for the first connection {@link #conOne}.
      */
@@ -42,6 +47,7 @@ public abstract class AbstractSmackIntegrationTest extends AbstractSmackIntTest
     public AbstractSmackIntegrationTest(SmackIntegrationTestEnvironment environment) {
         this.connection = this.conOne = environment.conOne;
         this.conTwo = environment.conTwo;
+        this.conThree = environment.conThree;
         if (environment.configuration.replyTimeout > 0) {
             this.defaultTimeout = environment.configuration.replyTimeout;
         } else {

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/Configuration.java

@@ -53,6 +53,10 @@ public final class Configuration {
 
     public final String accountTwoPassword;
 
+    public final String accountThreeUsername;
+
+    public final String accountThreePassword;
+
     public final boolean debug;
 
     public final Set<String> enabledTests;
@@ -63,7 +67,7 @@ public final class Configuration {
 
     private Configuration(DomainBareJid service, String serviceTlsPin, SecurityMode securityMode, int replyTimeout,
                     boolean debug, String accountOneUsername, String accountOnePassword, String accountTwoUsername,
-                    String accountTwoPassword, Set<String> enabledTests, Set<String> disabledTests,
+                    String accountTwoPassword, String accountThreeUsername, String accountThreePassword, Set<String> enabledTests, Set<String> disabledTests,
                     Set<String> testPackages) {
         this.service = Objects.requireNonNull(service,
                         "'service' must be set. Either via 'properties' files or via system property 'sinttest.service'.");
@@ -83,6 +87,8 @@ public final class Configuration {
         this.accountOnePassword = accountOnePassword;
         this.accountTwoUsername = accountTwoUsername;
         this.accountTwoPassword = accountTwoPassword;
+        this.accountThreeUsername = accountThreeUsername;
+        this.accountThreePassword = accountThreePassword;
         this.enabledTests = enabledTests;
         this.disabledTests = disabledTests;
         this.testPackages = testPackages;
@@ -110,6 +116,10 @@ public final class Configuration {
 
         private String accountTwoPassword;
 
+        public String accountThreeUsername;
+
+        public String accountThreePassword;
+
         private boolean debug;
 
         private Set<String> enabledTests;
@@ -153,11 +163,13 @@ public final class Configuration {
         }
 
         public Builder setUsernamesAndPassword(String accountOneUsername, String accountOnePassword,
-                        String accountTwoUsername, String accountTwoPassword) {
+                        String accountTwoUsername, String accountTwoPassword, String accountThreeUsername, String accountThreePassword) {
-            this.accountOneUsername = accountOneUsername;
+            this.accountOneUsername = StringUtils.requireNotNullOrEmpty(accountOneUsername, "accountOneUsername must not be null or empty");
-            this.accountOnePassword = accountOnePassword;
+            this.accountOnePassword = StringUtils.requireNotNullOrEmpty(accountOnePassword, "accountOnePassword must not be null or empty");
-            this.accountTwoUsername = accountTwoUsername;
+            this.accountTwoUsername = StringUtils.requireNotNullOrEmpty(accountTwoUsername, "accountTwoUsername must not be null or empty");
-            this.accountTwoPassword = accountTwoPassword;
+            this.accountTwoPassword = StringUtils.requireNotNullOrEmpty(accountTwoPassword, "accountTwoPasswordmust not be null or empty");
+            this.accountThreeUsername = StringUtils.requireNotNullOrEmpty(accountThreeUsername, "accountThreeUsername must not be null or empty");
+            this.accountThreePassword = StringUtils.requireNotNullOrEmpty(accountThreePassword, "accountThreePassword must not be null or empty");
             return this;
         }
 
@@ -213,7 +225,7 @@ public final class Configuration {
 
         public Configuration build() {
             return new Configuration(service, serviceTlsPin, securityMode, replyTimeout, debug, accountOneUsername,
-                            accountOnePassword, accountTwoUsername, accountTwoPassword, enabledTests, disabledTests,
+                            accountOnePassword, accountTwoUsername, accountTwoPassword, accountThreeUsername, accountThreePassword, enabledTests, disabledTests,
                             testPackages);
         }
     }
@@ -252,7 +264,9 @@ public final class Configuration {
         String accountOnePassword = properties.getProperty("accountOnePassword");
         String accountTwoUsername = properties.getProperty("accountTwoUsername");
         String accountTwoPassword = properties.getProperty("accountTwoPassword");
-        builder.setUsernamesAndPassword(accountOneUsername, accountOnePassword, accountTwoUsername, accountTwoPassword);
+        String accountThreeUsername = properties.getProperty("accountThreeUsername");
+        String accountThreePassword = properties.getProperty("accountThreePassword");
+        builder.setUsernamesAndPassword(accountOneUsername, accountOnePassword, accountTwoUsername, accountTwoPassword, accountThreeUsername, accountThreePassword);
 
         builder.setDebug(properties.getProperty("debug"));
         builder.setEnabledTests(properties.getProperty("enabledTests"));
@@ -262,7 +276,7 @@ public final class Configuration {
         return builder.build();
     }
 
-    private static File findPropertiesFile() throws IOException {
+    private static File findPropertiesFile() {
         List<String> possibleLocations = new LinkedList<>();
         possibleLocations.add("properties");
         String userHome = System.getProperty("user.home");

smack-integration-test/src/main/java/org/igniterealtime/smack/inttest/SmackIntegrationTestEnvironment.java

@@ -24,14 +24,17 @@ public class SmackIntegrationTestEnvironment {
 
     public final XMPPTCPConnection conTwo;
 
+    public final XMPPTCPConnection conThree;
+
     public final String testRunId;
 
     public final Configuration configuration;
 
-    SmackIntegrationTestEnvironment(XMPPTCPConnection conOne, XMPPTCPConnection conTwo, String testRunId,
+    SmackIntegrationTestEnvironment(XMPPTCPConnection conOne, XMPPTCPConnection conTwo, XMPPTCPConnection conThree, String testRunId,
                     Configuration configuration) {
         this.conOne = conOne;
         this.conTwo = conTwo;
+        this.conThree = conThree;
         this.testRunId = testRunId;
         this.configuration = configuration;
     }