SOCK on RedHat-8 gpsd-3.19-4.el8.1

[David Cottle]



Hey Gary and All,

Has anybody got SOCK running on RedHat-8 / CentOS-8?

I’m using an old Motorola in binary mode with PPS over serial.

Configured /etc/sysconfig/gpsd it’s ttyS0, etc.

Set options in chrony.conf.

# SHM0 from gpsd is the NMEA data at 4800bps, so is not very accurate

refclock SHM 0 refid GPS precision 1e-1 offset 0.9999

#

# PPS is from the /dev/pps0 device.  Note that

# chronyd creates the /var/run/chrony.ttyS1.sock device, but

# gpsd creates the /dev/pps0 device

# openrc rules start gpsd /after/ chronyd, so /dev/pps0 

#   is not created until after chronyd is started

#   If you want to use pps0, either edit the openrc rules

#   or add this source after gpsd is started

#

refclock PPS /dev/pps0 refid PPS precision 1e-7

#

# SOCK protocol also includes PPS data and 

# it also provides time within a few ns

refclock SOCK /var/run/chrony.ttyS0.sock delay 0.0 refid SOCK

Result I’m seeing:

MS Name/IP address         Stratum Poll Reach LastRx Last sample

===============================================================================

#x GPS                           0   4   377    22   -922ms[ -922ms] +/-  100ms

#x PPS                           0   4   377    20   +203ms[ +203ms] +/-   34us

#? SOCK                          0   4     0     -     +0ns[   +0ns] +/-    0ns

^+ time-d-b.nist.gov             1  10   377  1102   +450us[ -168us] +/-   39ms

^- clock.isc.org                 3  10   377   662  -4362us[-4362us] +/-  115ms

^+ clock.nyc.he.net              1  10   377   515   -239us[ -239us] +/-   41ms

^- tick.eoni.com                 3  10   377   142   +200us[ +200us] +/-  176ms

-cut-

I’ve disabled firewalld and tried selinux permissive. Can’t get the SOCK time.

I’m hoping someone’s had the issue.

Cheers,

David 

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