MQTT is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. MQTT(formerly MQ Telemetry Transport) is an ISO standard publish-subscribe based "light weight" messaging protocol for use on top of the TCP/IP protocol. It 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. It is also ideal for mobile applications because of its small size, low power usage, minimised data packets, and efficient distribution of information to one or many receivers.
Links:
https://www.youtube.com/watch?v=exMm-fmU5ck
https://www.youtube.com/watch?v=1GbYkCrbChw
https://www.youtube.com/watch?v=r6HEQVhgnP8
http://www.penninkhof.com/2015/05/linking-the-esp8266-a-raspberry-pi-through-mqtt/
https://www.youtube.com/watch?v=vVRy-WxNkes
https://www.youtube.com/watch?v=ae1QfoXPGQ8
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