At first a I used a Raspberry Pi as an infrared sending device so I could control my air conditioner and lights remotely. Now I've built that functionality into

At first a I used a Raspberry Pi as an infrared sending device so I could control my air conditioner and lights remotely. Now I've built that functionality into its own PCB, but as I'm developing that product I need an MQTT broker to connect to. So the Pi now functions as a local MQTT broker until I have a hosted one I'm satisfied with. Next thing I want to do with it is run a little web app that displays local train and bus times, garbage collection days, weather forecasts, and that sort of thing. They're great for prototyping hardware ideas and running various one-off web services locally!