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While I had heard the abbreviation MQTT many times, I never had a closer look at what MQTT is. Here are a few quick notes about using MQTT as Pub/Sub bus in a home IOT network. Motivation Once you have a few IOT devices, an obvious question is how to network them. If all your devices are from the same vendor, the vendor takes care of it. In my home, I have many different vendors/devices, such as (incomplete list): Nuki Opener Smart Intercom Sonoff S26 Smart Plug (WiFi-controlled socket outlet) ...