https://www.eclipse.org/paho/index.php?page=clients/python/index.php
https://randomnerdtutorials.com/esp-now-many-to-one-esp32/
https://circuits4you.com/2017/12/31/nodemcu-pinout/
https://randomnerdtutorials.com/esp8266-deep-sleep-with-arduino-ide/
https://www.electronicshub.org/esp8266-deep-sleep-mode/