If you’re looking at a microcontroller with Ethernet support though, say, an ESP32 or some STM, or the Pine64’s Ox64, it’s way more likely to just have a MAC, so you will have to add a ...

or omitting it entirely in favor of Ethernet. As far as getting a lot out of a tiny microcontroller, though, leveraging MQTT really helps the ESP32 go a long way. These chips have come along way ...