A WM1302 gateway has been installed on a Raspberry Pi using a WM1302 PI Hat. After the Lorawan software installation all seems to be working except the GPS (did direct the GPS to a clear sky south - but don’t believe that was the issue). I checked the (GPS) UART pin 8 (RxD) and pin 10 (TxD) on the interface with an oscilloscope.
The TxD seems to have a signal and a decoder can make sense out of it. However there seems to be no (proper) signal on the RxD.
Anybody any suggestion on what might be the root cause? Any driver issue or something with the hardware?