MQTT

Message Queue Telemetry Transport (MQTT) is an open message protocol for M2M (machine-to-machine) communications that enables the transfer of telemetry-style data in the form of messages from pervasive devices, along high latency or constrained networks, to a server or small Message Broker. Pervasive devices may range from Sensor-s and actuators, to Mobile phones, embedded systems on vehicles, or laptops and full scale computers. http://en.wikipedia.org/wiki/MQ_Telemetry_Transport

Also used in Facebook Messenger: 2011-01-15-BelugaGroupMessaging

Andy Piper notes http://andypiper.co.uk/tag/mqtt/

• http://andypiper.co.uk/2011/11/04/mqtt-goes-free-a-personal-qa/

more-lightweight than XMPP http://stackoverflow.com/questions/7129821/mqtt-vs-xmpp-which-should-i-choose