This one seems to be linked to
I had a zoom session with peter and have the gps module working. We have also verified that ttn is sending packets back to the gateway with correct time to transmit and frequency.
So we are at the point to verify they are sent from the gateway and work out why the node did not get it.
My current thought is the node rx window delay needs to be tweaked to 5 and 6 seconds as i think its 1 and 2 by default and the ttn is seting 5 seconds.
He is away this week, so may be slow responding.