query jabber:iq:private org.jivesoftware.smackx.PrivateDataManager$PrivateDataIQProvider query jabber:iq:time org.jivesoftware.smackx.packet.Time x jabber:x:roster org.jivesoftware.smackx.provider.RosterExchangeProvider x jabber:x:event org.jivesoftware.smackx.provider.MessageEventProvider