Topic (MQTT JSON Schema A)

With the MQTT protocol, the information that is transmitted in messages is organized into a hierarchy of topics.

A client publishes message data to one or more brokers. Each broker then transmits that data to whichever clients are connected to the broker and have subscribed to the topics with which the data is associated.

In the Geo SCADA Expert database, you use an MQTT JSON Schema A Device item to reference both the broker from which Geo SCADA Expert retrieves data, and the topic with which that data is associated.