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Re: [gpsd-users] GL* strings and gpspipe

From: John Klug
Subject: Re: [gpsd-users] GL* strings and gpspipe
Date: Mon, 14 Jan 2019 22:33:32 +0000

We want to use the u-blox gpsd driver so our patch for leap second will work.

So if gpspipe is to put out NMEA strings (or maybe both u-blox and nmea), 
should we use gpsctl to configure the u-blox for both u-blox and nmea combined? 
 I believe it is possible for it to write both.  Then we could use gpspipe -r, 
and get both?  Or would that cause gpsd to fail, or would gpsd clear out the 
settings by gpsctl to use both NMEA and u-blox proprietary?

John Klug
Senior Software Engineer

From: gpsd-users <address@hidden> on behalf of Gary E. Miller <address@hidden>
Sent: Monday, January 14, 2019 12:20:47 PM
To: address@hidden
Subject: Re: [gpsd-users] GL* strings and gpspipe

Yo John!

On Mon, 14 Jan 2019 17:34:33 +0000
John Klug <address@hidden> wrote:

> Recently we tried to use gpsd with gpspipe with an application, and
> we were wondering if it were possible to have gpspipe dump $GLL
> strings with GPSD using the U-Blox driver?

"gpspipe -r" dumps whatever the U-blox is sending to gpsd.  No filtering.

So you problem is not in gpsd or gpspipe, but it how you setup your u-blox.

> Previously this particular application did not use gpsd, and was
> looking at the NMEA TTY output of the U-Blox directly, and in that
> case there are $GLL strings.  We would like to use gpspipe instead.

Unless you tell gpsd otherwise, it tries to put the GPS in u-blow binary
mode.  So then you only get a few of the binary sentences converted to
pseudo-NMEA.  If you want NMEA, then put the unit in NMEA mode: gpsctl -n.

But the JSON from "gpspipe -w" is much more flexible and informative, try
to use that instead.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  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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