[chrony-users] Help

[Munsif ALI]

Hi,

Problem : Chrony synchronization(connectivity) is lost after 10 to 15 minutes.

I have used for logging sensor data while not connected to the Internet.I want to use a GPS receiver<https://m.ipc2u.com/catalog/gps-721> for the time synchronization. I would like to use gpsd and chrony to achieve this.

here is my chrony.conf file

refclock SOCK /var/run/chrony.ttyS0.sock refid SOCK
keyfile /etc/chrony/chrony.keys
commandkey 1
driftfile /var/lib/chrony/chrony.drift
log tracking measurements statistics
logdir /var/log/chrony

# maxupdateskew 100.0

dumponexit

dumpdir /var/lib/chrony

# local stratum 10
allow

logchange 0.5

makestep 1 -1

# mailonchange ***@localhost 0.5

hwclockfile /etc/adjtime

rtcsync

When I run chronyc tracking and chronyc sources it looks like the my machine is connecting to GPS.

here my Chronyc tracking command output:


Reference ID : 116.122.250.120 (116.122.250.120)
Stratum : 1
Ref time (UTC) : wed sep 18 19:05:11 2018
System time : 0.000564536 seconds fast of NTP time
Last offset : +0.000280794 seconds
RMS offset : 0.000322653 seconds
Frequency : 19.616 ppm fast
Residual freq : +0.003 ppm
Skew : 0.053 ppm
Root delay : 0.039604 seconds
Root dispersion : 0.000406 seconds
Update interval : 1042.6 seconds
Leap status : Normal


***@munsif:/home/munsif# chronyc sources -v
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#* SOCK 0 4 7 10 -12us[ +561us] +/- 15us

When we start the GPS chronyc sources -v says chrony is synchronized the gps sock... here is the output of chronyc sources.
After 5 to 10 mints chronyc sources -v command says GPS in not synchronized

***@munsif:/home/munsif# chronyc sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? SOCK 0 4 0 436 +121ns[ +132ns] +/- 3511ns

Every thing is working fine for 5 to 10 mints and after that chrony is not sync with GPS.
when chrony is not sync I run following commands
systemctl restart chrony
systemctl restart gpsd
Now chrony is sync with GPS approx 5 to 10 mints and again after that connectivity is lost.

I have also put this question to stackoverflow and unix.exchange web.

Here this question link<https://stackoverflow.com/questions/52400105/chrony-connectivity-is-lost-after-10-to-15-minutes> and here is discussion link<https://chat.stackoverflow.com/rooms/180544/discussion-between-munsif-ali-and-user3788685>

Any help will be highly appreciated.

regrads.

Munsif Ali