I flashed a POW R2 with your firmware and had no issue to add it to Smartthings with your connect app.
I’m however not getting any V, W or A readings in Smartthings. (All readings are 0).
I don’t see any errors in the IDE log:
The web interface also shows no readings:
(The switch is connected to a pool pump rated at 1500W.)
I’ve tried obvious thinks like rebooting but that made no difference. Unfortunately I flashed the firmware on receipt, not checking if the device report any readings, so it could be that the device is faulty.
Have you perhaps encountered this and do you have any suggestions?