| [chrony-users] inquiry | unable to sync. with no-pps gps via sock |
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Trying to understand why when using a GPS (without PPS support; less
than ideal) that the chronyd instance will not "synchronize"/talk when
using the `SOCK` reference clock type. Using a setup of chronyd and
gpsd, I can inspect that gpsd (via gpsmon) is receiving GPS
information; however, a call to `chronyc sources` shows that no
updates are getting through:
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? SOC0 0 4 0 - +0ns[ +0ns] +/- 0ns
This is with using the following minimal reference clock configuration:
refclock SOCK /run/chrony.ttyACM0.sock
If I switch to using a `SHM` type, such as follows:
refclock SHM 0
chrony appears to be reporting sample updates over time:
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? SHM0 0 4 3 14 +46ms[ +46ms] +/- 261us
To sanity check my state, I switched to a Garmin GPS device with PPS
support using the following configuration:
refclock SOCK /run/chrony.ttyUSB0.sock
And I can observe updates being tracked by chrony:
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? SOC0 0 4 1 22 -71ms[ -71ms] +/- 69us
Am I overlooking a possible setting that is needed for `SOCK` to
handle a pipe that will not get PPS updates? Or something else? Any
help is appreciated.
Other information:
- Confirming that in the usages of `SOCK` that chronyd is started
before gpsd is started.
- chrony version | 4.2 (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP
+SCFILTER +SIGND +ASYNCDNS +NTS +SECHASH +IPV6 -DEBUG)
- gpsd version | 3.23.1
- Tested GPS device without (an exposed) PPS support | USB dongle
using a "u-blox 7 - GPS/GNSS Receiver" chipset.
- Tested GPS device with PPS support | Garmin 16X
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