Message Queuing Telemetry Transport (MQTT) is a simple lightweight protocol for transmitting data between machines. It has become one of the most important protocols in the internet of things (IoT) and now plays a major role for many companies. However, this protocol has already existed since 1999 and was developed by IBM. In 2014, it was approved as a standard by the Organization for the Advancement of Structured Information Standard (OASIS).