Re: [chrony-users] Not getting time from gpsd

Nothing in /dev/shm. I added the log entries to chrony.conf but there is no /var/log/chrony/refclocks file.

here is the latest chrony.conf.

#server 0.us.pool.ntp.org
#server 1.us.pool.ntp.org
#server 2.us.pool.ntp.org
#server 3.us.pool.ntp.org

driftfile /var/lib/chrony/drift

allow

# set larger delay to allow the NMEA source to overlap with
# the other sources and avoid the falseticker status
refclock SHM 0 refid GPS precision 1e-1 offset 0.9999 delay 0.2
#refclock SHM 1 refid PPS precision 1e-9
refclock SOCK /var/run/chrony.ttyACM0.sock refid GPSS

makestep 1 -1

logdir /var/log/chrony
log refclocks

after making the mods I restarted chrony. here is the chronyc sources output

210 Number of sources = 2
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
#? GPS 0 4 0 10y +0ns[ +0ns] +/- 0ns
#? GPSS 0 4 0 10y +0ns[ +0ns] +/- 0ns

ps -ef |grep gpsd |grep -v grep
gpsd 31426 1 0 13:36 ? 00:00:00 /usr/sbin/gpsd -N -F /var/run/chrony.ttyACM0.sock /dev/ttyACM0

On Sat, Aug 6, 2016 at 11:48 AM, Steve Horton <stevejhorton@xxxxxxxxx> wrote:

Agreed. Shms live in /dev along with the real time clocks /dev/rtc0. Your kernel config dictates what's there. Look around in dev and see what shms are there and mod your chrony configuration to point to one of them and check tracking. I'd also comment out all server lines until you get it syncing with the GPS device.

On Aug 6, 2016 11:18 AM, "Bill Unruh" <unruh@xxxxxxxxxxxxxx> wrote:
shm should also work. Question is if they are reading the same shm location.

William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/

On Sat, 6 Aug 2016, Steve Horton wrote:

Not really Chris. I don't see a sock option in your configuration file. Gpsd should write time out to a device
file some where and chrony can read the time from that device file via a Unix domain socket. Like I said..look
into the sock option and how it relates to gpsd.

On Aug 6, 2016 10:10 AM, "Chris Greenman" <chris.m.greenman@xxxxxxxxx> wrote:

Same thing. Already tried it.

On Aug 6, 2016 6:35 AM, "Steve Horton" <stevejhorton@xxxxxxxxx> wrote:

I'd look closer at the SOCK option under the refclock section.
https://chrony.tuxfamily.org/manual.html#refclock-directive

On Aug 6, 2016 12:00 AM, "Chris Greenman" <chris.m.greenman@xxxxxxxxx> wrote:
>
> Hello,
> I'm having an issue with getting time from gpsd.
>
> My setup is:
> Raspberry Pi 3 running Jessie Lite
> USB U-Blox gps
>
> gpsd is receiving NMEA from the GPS, cgps also shows time and position properly.
>
> My chrony.conf is:
>>
>> server 0.us.pool.ntp.org
>> server 1.us.pool.ntp.org
>> server 2.us.pool.ntp.org
>> server 3.us.pool.ntp.org
>> driftfile /var/lib/chrony/drift
>> allow
>> refclock SHM 0 refid GPS precision 1e-1 offset 0.9999 delay 0.2
>> makestep 1 -1
>>
> Chronyc sources shows this:
>>
>> $ chronyc sources
>> 210 Number of sources = 5
>> MS Name/IP address Stratum Poll Reach LastRx Last sample
>> ===============================================================================
>> #? GPS 0 4 0 10y +0ns[ +0ns] +/- 0ns
>> ^+ time-c.nist.gov 1 9 375 110 -23ms[ -22ms] +/- 47ms
>> ^* pool-96-248-122-64.cmdnnj 1 10 377 56 +9749us[ +11ms] +/- 18ms
>> ^- 104.156.99.226 2 9 377 367 +15ms[ +17ms] +/- 107ms
>> ^- 4.53.160.75
>>
> This system is going to be used on a boat and might not have internet. I can tell
that both programs are accessing the shared memory using ipcs -m:
>
>> ------ Shared Memory Segments --------
>> key shmid owner perms bytes nattch status
>> 0x4e545030 0 root 600 80 2
>> 0x4e545031 32769 root 600 80 1
>>
> Any idea why chrony isn't getting time from the GPS?
>
> Thanks