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.

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

Andy Piper notes

more-lightweight than XMPP

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