Invalid gps time reference

[Cornmeister]

Hi All,

I've just installed my ic88a-gateway, raspberry pi 2 (raspbian bullseye) and a USB UBlox-7 GPS receiver.
When I do a cat /dev/ttyACM0, I do see GPS data, even with correct lat/long etc.
When I start gpsd, I can also see a 3d fix with cgps.

When I take a look at the gateway logs, It says the GPS is not working.

*** Poly Packet Forwarder for Lora Gateway ***
Version: 2.1.0
*** Lora concentrator HAL library version info ***
Version: 3.1.0; Options: native;
***
=====
INFO: GPS serial port path is configured to "/dev/ttyACM0"
INFO: GPS is enabled
INFO: Using real GPS if available.
INFO: Reference latitude is configured to xxxxxx deg
INFO: Reference longitude is configured to xxxxx deg
INFO: Reference altitude is configured to 3 meters
INFO: [main] TTY port /dev/ttyACM0 open for GPS synchronization
INFO: GPS thread activated.
=====
### [GPS] ###
# Invalid gps time reference (age: 1648667237 sec)
# no valid GPS coordinates available yet

and this keeps on going, not syncing at all.

any idea how to fix the gps time sync ?