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Re: gps feed from socat

From: Gary E. Miller
Subject: Re: gps feed from socat
Date: Tue, 26 Oct 2021 10:23:39 -0700

Yo Nick!

On Tue, 26 Oct 2021 13:47:16 +0100
Nick Taylor <> wrote:

> Doing some testing on the latest 3.23.2~dev and noticed that cgps 
> appears to glitch with altitude coming and going.

Yes, unavoidable with NMEA.

> Tried using a feed from socat calling gpspipe  as per docs and also 
> using kplex which provides a raw feed from my gps device


> The raw feed doesn't seem to glitch but the socat one does. Note that
> my gpsd on the server providing feed is v3.22 but I wouldn't expect
> that to cause glitch?

Not much I can say without data captures.

And remember, the scoat example is pusedo-NMEA, not NMEA, so it will not
match your NMEA exactly.

> Attaching 2 feed samples captured on dest machine using gpspipe -r in 
> case anyone can spot anything strange there...

No good, I need 'gpspipe -R" to see, I need the raw data, not the psuedo
NMEA after being processed a 2nd time as speudo NMEA.

Also helpful would be a descriont of the real GPS model and how it is

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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