Subscriber: Receives messages through the broker.Broker: Forwards messages to registered subscribers.In detail, the transfer consists of three different components: More accessories and complicated wiring is not necessary! This makes it possible to send the data via the local network or the Internet. The big advantage is that the built-in wifi adapters (for example in the Raspberry Pi or in the ESP8266) are used for the internet connection. It is therefore a standardized network protocol with which short messages / commands can be transmitted. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. It was designed as an extremely lightweight publish/subscribe messaging transport. MQTT is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol.
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