MQTT MQTT is a subscription protocol, as opposed to HTTP, which is a request based protocol. If you want to send information/commands over HTTP, you would make a request, and an HTTP server would respond with the information. In an MQTT environment, information is published to the MQTT broker and a client has to keep a constant connection… Read More » (https://www.androidbuffet.com/2018/01/31/episode-381-mqtt-pi/)

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