Re: gpsd losing connection to ublox

[Gary E. Miller]

Yo Niall!

On Wed, 10 Nov 2021 21:04:55 -0800
Niall Parker <stuff@npengineering.ca> wrote:

> On 2021-11-10 2:07 p.m., Gary E. Miller wrote:
> > Can you be more specific on "latest"?  Latest is:
> >
> > # gpsd -V
> > gpsd: 3.23.2~dev (revision release-3.23.1-122-g3d860d8d1)  
> 
> I didn't recognize gpsd was so active !

Sctually, been a slow month.

> ... must pull more often, now 
> trying release-3.23.1-124-g17aa9ebce

Whatever works for you, but for bug reporting best to know the bug
not already fixed.

> > gpsmon is not a tool to debug NTP.  What does ntpshmmon show?  

It shows the output from gpsd that is going into ntpd.  It is
the only way gpsd talks to ntpd.

> ntpshmmon: version 3.23.2~dev
> #      Name  Seen@                 Clock Real                 L Prc
> sample NTP2  1636605083.112353126  1636605083.000066187 
> 1636605083.000000000 0 -20
> sample NTP0  1636605083.147133927  1636605083.146458406 
> 1636605083.000116578 0  -1

And it shows gpsd is sending on NTP0 and NTP2, which is odd considering
what I though was you configuration.

How exactly are you running gpsd?  Put another way, what is
the output of this, run as root:

# pstree -paul | fgrep gpsd

> ... this gave me the clue it wasn't NTP1 I needed but rather NTP2, 
> adjusting that in ntp.conf and finally it was able to reach the PPS
> signal.

Good, but fishy.  What is you full ntp.conf now?

> Found a note in https://gpsd.io/gpsd-time-service-howto.html this
> might be the case for some GPS HATs, should have read it more
> carefully ! ;)

But that is not what I would expect from MAGIC_HAT option.

> Now that PPS is getting through I can follow the tuning procedure in
> the howto, give it some time get some stats.

Patience, and ntpviz, are required to tune it.  Ad tuning depends on
what you want to optimize.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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

pgpU8EljJ_asi.pgp
Description: OpenPGP digital signature