Ethernet for ESP32 and switch

[TimGremalm]

• [ ] Evaluate ESP342 devboard with ethernet.
• [ ] Look for 3 port ethernet switch
• [ ] Look for RJ45 connector with built in magnetics
• [ ] Move UI south to give place på 3x RJ45

Switch referense design:

• https://github.com/msadowski/SwitchBlox
• https://raw.githubusercontent.com/msadowski/SwitchBlox/master/Hardware/Reference%20Images/SwitchBlox%20Schematic.pdf

ESP32 ethernet reference design:

• https://github.com/OLIMEX/ESP32-GATEWAY
• https://raw.githubusercontent.com/OLIMEX/ESP32-GATEWAY/master/HARDWARE/Hardware%20revision%20G/ESP32-GATEWAY_Rev_G.pdf

ESP32 PoE ethernet reference design:

• https://github.com/OLIMEX/ESP32-POE
• https://raw.githubusercontent.com/OLIMEX/ESP32-POE/master/HARDWARE/ESP32-PoE-hardware-revision-E/ESP32-PoE_Rev_E.pdf