Comment by baby_souffle

Nordic nrf series of chips are ubiquitous, cheap, really well documented and have very good support for the Bluetooth side of things in embassy.

If you don't need any of the wireless radio stuff, I think the raspberry pi microcontroller family is also ridiculously well supported in rust and it's possible to get one of the newer raspberry pi microcontroller is complete with ethernet and several megs of flash for not even 10 bucks.