What is an MQTT Broker?

A MQTT Broker is the software for the central Data Hub in an MQTT Network. The broker receives data from one of its MQTT clients and files it into topics from an information tree. From there the data is routed (“published”) to all clients that subscribed to this particular topic. MQTT Brokers are often found in the lowest levels of an Automation Pyramid to ensure local delivery of time critical data. They can also be used in large scale installations where unreliable connections guarantee the latest known status of a topic being available to subscribers. Also, subscribers from higher levels in the Automation Pyramid use the data to generate up-to-date status reports and issue commands to the underlying infrastructure.

Where is an MQTT broker used?

They can also be used in large installations where unreliable connections guarantee that the last known status of a topic is available to subscribers. In addition, subscribers at higher levels in the automation pyramid use the data to generate up-to-date status reports and issue commands to the underlying infrastructure.