In short, MQTT clients publish and/or subscribe to topics from an MQTT Broker, which is sometimes referred to as an MQTT Server: Image from While the RTA MQTT Gateway I'll be testing works with AWS and Azure as well as generic MQTT gateways, I chose the latter as the first two systems require a credit card to setup an account, as well as an open internet connection (which may not be available in all test applications.) After doing some research, it seemed like the most popular free, self-hosted MQTT Broker was Mosquitto, and that is the broker I'll use in this example. If you're new to MQTT, the below image from does a great job explaining how a system works. To demonstrate it in this week's episode of The Automation Show, I needed to setup my own test system, and today I'll share what I learned in the hopes that it will help you get your test system up and running quickly. Recently I received a sample of the brand new MQTT Gateway from the good folks over at Real Time Automation.
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June 2023
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