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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.

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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