inspired by https://randomnerdtutorials.com/tca9548a-i2c-multiplexer-esp32-esp8266-arduino/ used also info from:
- https://randomnerdtutorials.com/esp32-esp8266-i2c-lcd-arduino-ide/
- https://nicuflorica.blogspot.com/2022/12/ceas-ntp-pe-afisaj-oled-de-096-128x64.html
