GPS problem with RAK2287 and raspberry Pi 5

LPWAN Developer Gateways / Concentrators
1

I have a RAK2287 hat running with a Pi 5.
There was an early problem with the GPIO configuration, but it then worked fine.
I have recently upgraded the pi software version and the GPS has stopped being able to get a fix. It gets the time OK.
If I stop the LORA packet forwarder service and look at the output from the GPS on /dev/ttyAMA0 you can see the (empty) NMEA sentences but there are also a lot of error message about invalid input to the GPS device. Researching this on the UBlox forum suggests that the output from the GPS may be being echoed back to it.

Any idea how to diagnose the problem?

Thanks
Alan

2

I have found the problem.
An update to raspberry pi OS has changed the GPIO pin used from 4 back to 0.
So I modified /opt/ttn-gateway/packet_forwarder/lora_pkt_fwd/start.sh and the GPS now works OK.

Alan

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