MCUs are ideal MQTT clients because the protocol is lightweight and designed for low-bandwidth, low-RAM environments.
We are always amused that we can run emulations or virtual copies of yesterday’s computers on our modern computers. In fact, there is so much power at your command now that you can run, say, ...
Available for pre-order at the time of writing, these take the form of the Badger, Tufty, and Blinky. These are E-Ink, IPS, ...