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MQTT stands for MQ Telemetry Transport. It
is a publish/subscribe, extremely simple and lightweight messaging protocol,
designed for constrained devices and low-bandwidth, high-latency or unreliable
networks. The design principles are to minimise network bandwidth and device
resource requirements whilst also attempting to ensure reliability and some
degree of assurance of delivery. These principles also turn out to make the
protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of
Things” world of connected devices, and for mobile applications where bandwidth
and battery power are at a premium.