https://www.openhab.org/docs/installation/openhabian.html#hardware
https://www.youtube.com/watch?v=08_GBROKQH0
https://templates.blakadder.com/sensors.html
NodeMCU PyFlasher
https://github.com/marcelstoer/nodemcu-pyflasher
* worked on RPI Zero: https://www.instructables.com/Raspberry-Pi-DS3231/
https://maker.pro/raspberry-pi/tutorial/how-to-add-an-rtc-module-to-raspberry-pi
https://learn.adafruit.com/adding-a-real-time-clock-to-raspberry-pi/set-rtc-time
* power on - PowerOnState - https://tasmota.github.io/docs/PowerOnState/
# https://tasmota.github.io/docs/Commands/ - 1 = disable SetOption63 1 # Always on PowerOnState 1