ref.:
- https://www.youtube.com/watch?v=_DO2wHI6JWQ
- https://learnembeddedsystems.co.uk/easy-raspberry-pi-iot-server
- https://github.com/SensorsIot/IOTstack
- https://www.tomshardware.com/how-to/send-and-receive-data-raspberry-pi-pico-w-mqtt
- https://www.hivemq.com/blog/iot-reading-sensor-data-raspberry-pi-pico-w-micropython-mqtt-node-red/
- https://www.raspberrypi.com/documentation/microcontrollers/micropython.html