Publisher-subscriber protocols have become more and more attractive to automation infrastructures. Message Queuing Telemetry Transport (MQTT) is one of the most prominent candidates for a lot of reasons. By design, it is very lightweight, fulfills high security standards, and guarantees state awareness to all infrastructure members. All those characteristics are very important, as they simplify development and make the solutions built on the protocol both safe and reliable. QtMqtt is available as an add-on to Qt and is available is the Qt for Automation offering.
Learn more about Qt in Automation at https://www.qt.io/qt-in-automation/