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

<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>