For this entry I got a little side tracked I created a simple firmware for the ESP32. When wired up correctly it will turn on/off the ES-200 from a remote app on a smart phone called RemoteXY. For this all the wires are connected up as per the original instructions. The exception being the enable wire (i.e. the blue wire, I believe.) Which should be connected to pin 13 LED_BUILTIN on the ESP32. It helps that its the led line to see that its working.