gpsd losing connection to ublox

[Niall Parker]

Hello,

I've setup gpsd and ntpsec as per the GPSD Time Service HOWTO, using a 
locally compiled gpsd v 3.23.1 instead of distribution version (Nvidia 
Jetson with Ubuntu 18.04). Managed to get PPS working after sorting the 
device tree and the system seems to work as expected initially.

After running for a short period of time though, gpsd seems to lose 
connection to the GPS (a ublox module connected to /dev/ttyTHS1). It 
will get a few updates then nothing for a minute or more, then maybe a 
couple more updates and another delay. Often cgps will fail with a timeout.

I've confirmed no delays or lost packets when just looking at serial 
output from GPS without gpsd running. I don't think power management is 
the issue, the board is moderately busy running 30-40% CPU most of the 
time. Could it be too busy for gpsd ???

Any hints on how to trace the loss of connection would be appreciated, 
thanks.

            ...Niall