Don't ask me why, but now it works. I changed nothing! Went to my girl over the weekend, coming back, the node was registred. Maybe a jammer went away?
@Mizar03 sorry for the late response. getStream() only works for firmware transfers. I'd suggest getString(), this should also work for all types of payloads, as they are normaly ASCII and not binary data.
Hi OSD, thanks for your input.
Those are the 4 relays on IO-MCU. I buzzed out the circuit and found that I had an open circuit on the 12v line to the relays.
Furthermore 2 of the relays indicator LEDs were illuminating, 2 were not.
I suspect, when I first juiced up the circuit on this MCU, the 2 relays fired, but I'd made the trace too thin for the required current. I wired up some jumper wire on the reverse of the PCB and the 2 relays started working.
The 2 that remain inoperable?
https://forum.arduino.cc/t/using-pins-a6-a7-on-pro-mini-compatible/118050
A6 and A7 can only be analogue inputs, cannot be digitally written to..... - so this part of my PCB is now redundant.
However, all in all, some good fault finding, found the two issues, and I'm now going away to re-think my PCB trace widths and reading the datasheets more accurately
Thanks