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Re: gpsd + chrony + pps

From: Dan Williams
Subject: Re: gpsd + chrony + pps
Date: Fri, 12 Jun 2020 08:54:57 -0400

that .sock file is not the same as the /var/run/chrony.yyACM0.sock  file.

(And no, I don't think the documentation is very clear on this part.)

For time synchronization, I recommend ensuring gpsd is called with the `-n` flag, and systemd starts it on startup.  (This requires modifying the systemd file for this, which includes removing the chrony.ttyXX.sock file, and the dependencies on it.... )   Although the list might have a better way.

For reference:
1. What OS brand & version are you using? 
2. Are you running this on a RPi, or a x86 computer?

I just set this up last week with a serial/pps line + intel computer + gpsd- (3.20 / master) + chrony (2.11).   So, it definitely _CAN_ be done, but the setup can be finicky.

Daniel Williams  |  Software Engineer

On Fri, Jun 12, 2020 at 6:03 AM Stéphane Péneau <> wrote:

I've made many tests to use the timepulse output on my U-blox ZED-F9P
with gpsd and chrony to get an accurate time.

I've never had a working solution if I try to use a socket like

But if I replace 'ttyXX' with my 'pps', it works.

refclock SOCK /var/run/chrony.pps0.sock refid PPS2 lock GNSS <== OK

refclock SOCK /var/run/chrony.ttyACM0.sock refid PPS2 lock GNSS <== NOK

Is there a mistake in the documentation ?


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