I'm running Mosquitto as the central messaging broker on an embedded Linux product right now. It's super lightweight. Running the broker on the target has bee

I'm running Mosquitto as the central messaging broker on an embedded Linux product right now. It's super lightweight. Running the broker on the target has been a really great thing during development. I can run validation systems on other machines and inject messages over the wire, or I can actually run the UI on my dev machine and let the backend respond from a live target. I also have a development team in Asia that can't get to the newest hardware, so I fire up a system here and open a port they can access. They love it. That said, the bandwidth in MQTT is lightweight but you still need a TCP/IP stack on your system. That's typically more substantial of a footprint than Mosquitto will be at the end of the day.