Xtras my reading list

Real Time Clocks and Arduino

https://www.circuitbasics.com/how-to-use-a-real-time-clock-module-with-the-arduino/

EEPROMs on I2C

https://www.instructables.com/The-Most-Comprehensive-Guide-to-Programming-the-AT/

On SDL programming

https://stackoverflow.com/questions/57672568/sdl2-on-raspberry-pi-without-x/

On plotting

http://members.chello.at/~easyfilter/bresenham.c

Networking on ESP

https://github.com/arduino-libraries/Ethernet/blob/master/examples/AdvancedChatServer/AdvancedChatServer.ino