MQTT Communication Driver

MQTT (MQTT stands for Message Queuing Telemetry Transport) is an IoT-based driver, but the communication principle – from the point of view of Reliance – is different from that of IoT Communication Driver (IoT stands for Internet of Things).

In the MQTT protocol, the data transfer format and algorithms are defined precisely.

Supported Reliance versions

The communication driver is supported in both Reliance 5 and Reliance 4.

Starting up the driver

The communication driver is a DLL loaded into memory by the Reliance 4 Driver Server program, which can be launched either as a Windows service at Windows startup or as a standard application at the start of a visualization project. Information required to make a connection with devices is read from the visualization project. After reading this information, communication to all connected devices is activated.

Data reception

The communication driver acts as a client and connects to the server, the so-called MQTT broker. All clients communicate with each other through this broker.