MQTT – Message Queuing Telemetry Transport

MQTT is specified in ISO/IEC 20922 and offers a simple protocol for distributed data sources. It is often selected for IoT applications thanks to its simple and flexible use. Data packets with any content, a size of up to 64 kB and a readable identifier (topic) can be exchanged  between distributed devices and a central broker. This enables the distributed devices to be fully independent and only require a communication relation to the broker, so that very flexible networks can be created easily.