NodeMCU read measurements from BME680 and send to flask SocketIO using MicroPython

1. BME680 sensor readings using https://github.com/robmarkcole/bme680-mqtt-micropython
2. SocketIO communication with Flask web server using https://github.com/danni/uwebsockets, with small changes needed for NodeMCU.

Don't forget to set your SSID credentials in boot.py. You also need to use mpy-cross in order to compile the *.py files (otherwise you get MemoryError: memory allocation failed).

I also wrote a more detailed blog post https://www.popsblog.me/post/23.