The guys in the EU are usiing this board. THe firmware is automaticly compiled on our Github releases page.
https://www.olimex.com/Products/IoT/ESP32/ESP32-GATEWAY/open-source-hardware
You will need a 12v to 5v supply such as the UBEC to power the board.
https://www.adafruit.com/product/1385
OpenEVSE is planning to release a Ethernet/WiFI board in the near future.
Walter Starks