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Re: No PPS from gpsd

From: Gary E. Miller
Subject: Re: No PPS from gpsd
Date: Thu, 29 Jul 2021 12:49:42 -0700

Yo Jim!

On Thu, 29 Jul 2021 18:21:46 +0000 (UTC)
Jim Pennino <> wrote:

>     On Thursday, July 29, 2021, 10:51:19 AM PDT, Gary E. Miller
> <> wrote: 
> > Using Ubuntu 20.04.2 and gpsd 3.20.  
> 3,20 is a tad old, and has a fatal bug appearing on October 23, 2021
> That is the current Ubuntu release.

Still bad.  And it will break in October 2021.

> > I replaced the long running USB GPS with a RS-232 device,
> > reconfigured and rebooted.  
> Would be nice to know how you reconfigured.  The devil is in the
> details.
> USBAUTO="false"
> DEVICES="/dev/ttyS4 "
> GPSD_OPTIONS="-n -b -s9600 "
> GPSD_SOCKET=/var/run/gpsd.socket

Better, still have no idea why you use the Bluetooth option, but unrelated.

> > NMEA data is just fine and ppscheck works but gpsd is not processing
> > the PPS signal on CTS.  
> Did you use "-D 4" with gpsd?  That is the best way to debug PPS.
> As gpsd only logs to syslog, I did not do that as setting syslog to
> debug will fill with messages from everything on the system. IMHO
> gpsd should have an option to set the logging facility to something
> quieter such as usr1.

Where it logs too is configurable by your logging system.  I only need
a minutes worth.

> > ppstest and ppswatch fail  
> Fail how?
> ppstest /dev/pps0
> trying PPS source "/dev/pps0"
> found PPS source "/dev/pps0"
> ok, found 1 source(s), now start fetching data...
> time_pps_fetch() error -1 (Connection timed out)

That sure looks like a broken pps.  As root or not root?

> ^C
> ppswatch /dev/pps0
> trying PPS source "/dev/pps0"
> found PPS source "/dev/pps0"
> time_pps_fetch() error -1 (Connection timed out)
> time_pps_fetch() error -1 (Connection timed out)
> ^C

That sure looks like a broken pps.  As root or not root?

> Verify by runnng gpsdebuginfo from here:
> Will do that later; send the output to who exactly?

Send it to the list here.  It is not long.  Without it we'll play
20-questions for the rest of the week.

> > # Other options you want to pass to gpsd
> > GPSD_OPTIONS="-n -b -s9600 "  
> Why -b?  You are not running on bluetooth.
> Because the gpsd documentation says it is read-only mode, not that it
> is read-only mode only for USB and bluetooth.

Actually, the doc says:
        "Broken-device-safety mode, "

Is your receiver broken?  Otherwise, bad idea.

> > Now I have no clue where to go next...  
> Shoot systemd(umber) in the head.
> Who is going to pay me to rewrite Ubuntu?

Devuan already did.  Many alternatives to Ubuntu that do not use

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can't measure it, you can't improve it." - Lord Kelvin

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