What do you do when you’ve deployed a project on-site and want to make sure it’s still running? Or perhaps check up on its performance, up time, or any other number of important components? Maybe you’re just looking to receive information from an internet-connected sensor for your project? Network-based messaging protocols are often a great option for these sorts of situations. MQTT is a commonly used messaging protocol for this purpose in the interactive and immersive field, and in this post we’re going to take a look at some of the protocol’s fundamentals, as well as setting up our own extremely simple MQTT server to receive messages from TouchDesigner.