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Re: Ublox and GPSD 3.22

From: Gary E. Miller
Subject: Re: Ublox and GPSD 3.22
Date: Thu, 30 Jun 2022 15:53:50 -0700

Yo Jeff!

On Thu, 30 Jun 2022 18:38:06 -0400
Jeff Curtis <> wrote:

>       How did you set u-blox binary mode?  How did you look at the
> I start GPSD with this command gpsd -G -n -F /var/run/gpsd.sock
> /dev/serial0 /dev/pps0, GPSD auto configures the device to Ublox
> mode.

Uh, you said you used the -p option to gpsd, that turns off the 
auto configuration.

> For the JSON I am using gps3 python  script and looking at the
> TPV messages.

We already know your program is broken in many ways.  See below for
more info.

> In Ublox mode the lat/lon/alt will not change but the
> ECEF values are.

I already pointed out many problems with yout program, please use
cgps, xgps, or gpspipe to confirm that.  More info below.

> > I am still trying to build the
> > latest, to see if that will fix the problem I am having, but I am
> > running into some other issues.  
>       We can't debug what we can't see.  Send here the FULL build
> log.  Did you follow the build instructions in build.adoc?
> Agree —my issues, I built it from source before without problems,
> haven’t had time to really look into it.  Will hopefully build it
> correctly this weekend.  No questions regarding this, I just ran into
> some configurations problems on my end with some packages.  

Which means you did not read build.adoc...

> > Has anyone seen anything similar? Why
> > would gpsmon see the information update but not cgps/xgps? Thanks
> > Jeff  
>       gpsmon has its own, broken, decoder for u-blox raw.
>       If you send us the raw data you see then someone can look at
> it: gpspipe -R -x 20 > log.raw
>       Then send here log.raw.  As well as how you configured the
> device.
> Attached is the raw capture

You might have mentioned that sooner.  I see the lat/lon/alt in there
just fine:

$ gpsdecode < log.raw

So your program is not decoding the data properly, but I already told
you that.  See my previous comments on your code errors.  Then try the

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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