[Discuss-gnuradio] GPS query get_mboard_sensors("gps_locked") fails sometimes

Hi All

On USRP N210, UHD 3.2.1
GPS does lock, because it gets the right time (not the 01/01/2006 set at
init)
using get_mboard_sensors("gps_locked") fails sometimes

1.
It may print on console :

UHD Error:
get_nmea(): unsupported GPS or no GPS detected

while at the start of the code, it always prints :

Found a Jackson Labs GPS

At this pont, I have to reboot the USRP. I have seen this error twice on
20 to 25 runs

2. Or :

UHD Error:
get_token: too few tokens in reply $GPGGA, [etc... then there are
more or less args after that, randomly)
GPS lock status: locked

This second error occurs 1% of the time, but following
get_mboard_sensors("gps_locked") succeed (no need to restart USRP)

3. Which leads me to :
How do you check if a get_mboard_sensors(...) fails or not ?
Because even when it fails, the value returned seems ok. And there is no
error field.
Or should this not happen ?

Thanks and Regards
Bastien

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