XMPP

XMPP is based on Extensible Markup Language (XML) and is an open technology for real-time communications. It evolved from the Jabber Instant Messaging (IM) protocol. Refer to http://www.ibm.com/developerworks/library/x-xmppintro/.

XMPP supports the transmission of XML messages over TCP transport, allowing IoT developers to efficiently implement service discovery and service advertisements.

XMPP-IoT is a tailored version of XMPP. Similar to human-to-human communication scenarios, XMPP-IoT communications begin with friend requests. For more information, see http://www.xmpp-iot.org/basics/being-friends/.

Upon confirmation of a friend request, the two IoT devices are able to communicate with each other, regardless of their domains. There also exist parent-child device relationships. Parent nodes within XMPP-IoT support configuration of trust policies that dictate what devices can connect with. Communication between IoT devices cannot proceed without a confirmed friend request between them.