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MQTT (MQ Telemetry Transport or Message Queue Telemetry Transport) is an ISO standard (ISO/IEC PRF 20922) publish-subscribe-based 'lightweight' messaging protocol for use on top of the TCP/IP protocol.

MQTT is designed for connections with remote locations where a 'small code footprint' is required or the network bandwidth is limited, the publish-subscribe messaging pattern requires a message broker.

The broker is responsible for distributing messages to interested clients based on the topic of a message.

Andy Stanford-Clark and Arlen Nipper of Cirrus Link authored the first version of the protocol in 1999.

In 2013, IBM submitted MQTT v3.1 to the OASIS specification body with a charter that ensured only minor changes to the specification could be accepted.

MQTT-SN is a variation of the main protocol aimed at embedded devices on non-TCP/IP networks, such as ZigBee.

Historically, the 'MQ' in 'MQTT' came from IBM's MQ Series message queuing product line.

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