Hello,
we have created a mini client/server version of CoAP targeting microcontrollers running MicroPython. Its main difference compared to the established Python implementations aiocoap and CoAPthon is its size and complexity since this library will be used on microcontrollers that support MicroPython such as: Pycom devices, ESP32, ESP8266.
link: https://github.com/insighio/microCoAPy
Kind regards.