Apparently there is an #XMPPIoT
protocol? http://internetofthingsagenda.techtarget.com/feature/XMPP-IoT-protocol-winner-or-second-place-to-MQTT > XMPP is already the underlying IM protocol for Google Hangouts, WhatsApp Messenger [ . . . ]
Also: There's an XMPP newsletter yay! (that's the first issue)
I had a look at http://www.xmpp-iot.org/
and it's not immediately clear whether there is an actual slimmed-down version of XMPP, or if it's just an information resource for people wanting to use XMPP in IoT.