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 -- To unsubscribe email chrony-users-requ...@chrony.tuxfamily.org with "unsubscribe" in the subject. For help email chrony-users-requ...@chrony.tuxfamily.org with "help" in the subject. Trouble? Email listmas...@chrony.tuxfamily.org.
