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Re: [gpsd-dev] Missing TPV when there is no fix


From: Gary E. Miller
Subject: Re: [gpsd-dev] Missing TPV when there is no fix
Date: Tue, 19 Sep 2017 14:03:06 -0700

Yo Piotr!

On Tue, 19 Sep 2017 08:27:20 +0200
Piotr Figiel <address@hidden> wrote:

> Hi Gary,
> 
> >>  on recent gpsd [1] I stumbled on an issue similar to one reported
> >> already in the past [2] that TPV with mode = 1 (MODE_NO_FIX) is not
> >> being sent by the gpsd when the fix is lost. Instead no TPV at all
> >> was received by the clients by the time there was no fix. This
> >> affects use case when it's expected to detect fix loss on libgps
> >> client.  
> > This is by design.  No data in to gpsd, then no data out.  
> 
> The data does come in to gpsd, I attached log. You can see RMC with
> invalid fix there (Status field = 'V'). Information about missing fix
> is still information (valuable one in this use case). Actually the
> existing code seems to attempt to register that but fails to report it
> outside of gpsd.

Yes, since the data is invalid, there is nothing to pass on.

Once again, this is by design.

RGDS
GARY
---------------------------------------------------------------------------
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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