Thank you, Bob & Paul. ?There's just so much to learn about JMRI (and then all the other bits of software it can interact with...)
Like much of Europe & the US at the moment, a heatwave here means I'm spending most time outside rather than at the computer, so it'll take me a little while to try the 2 suggestions out. ?But just a couple of comments:
Bob: ?At present, my iMac, Arduino & motor shield are in my office. ?A 5m USB cable currently runs from the motor shield there to the rails outside. ?The USB connection on the ESP32 (driving the servos) is taken up by the power supply from the 5v "Phone charging" battery. ?I could try using a different 5v source for the ESP32 connected directly to a voltage in on the ESP32 and so free up its USB connection to take input from motor shield as you suggest.
Paul: ?Yes, the ESP32 outside is on the house wifi - as are the iMac running JMRI and the iPhone running the WiThrottle app. ?Your suggestion looks feasible and I will try it in due course, but, if possible, I'd prefer not to have to introduce even more s/w elements to the system or interfaces between them, like MQTT and mosquito. ?We'll see...
Best regards,
Les
