What is the current capacity of the +5V output pin on the Gateway?
Pin #20 of CON1 is only input. It is meant for powering ESP32-GATEWAY board if micro USB powering is unavailable for our setup. Refer to the schematic here - search for +5V_USB signal: https://github.com/OLIMEX/ESP32-GATEWAY/blob/master/HARDWARE/Hardware%20revision%20B/ESP32-GATEWAY_Rev_B_color.pdf