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Re: [gpsd-dev] Possible Bug in libgpsd_core.c

From: Neustifter Andreas
Subject: Re: [gpsd-dev] Possible Bug in libgpsd_core.c
Date: Fri, 8 Mar 2019 08:23:14 +0000

Hi Gary,

I will test this on Monday when I back at the lab.


> From: gpsd-dev <address@hidden> On Behalf Of Gary E. Miller On Freitag, 08. 
> März 2019 03:56
> Yo Neustifter!
> Revisiting an old thread.  Not that I forgot, but because the solution was 
> time
> consuming to create.
> > > I can also see that the
> > > regression test are failing big time since the downgrade is actually
> > > reported to the clients. Most probably this has unintended
> > > consequences for the majority of GPSd users.
> You had proposed a small patch that fixed a u-blox issue, but broke a large
> number of NMEA regressions.  Luckily only NMEA 183.
> > The problem is many GPS report, in a single cycle, the fix quality in
> > different ways.  gpsd has to merge them into a final mode.  That is
> > hard to do.
> Yeah, hard.  I moved the late in the packet processing test for fix 
> downgrading
> back into the NMEA driver where it belonged.
> But that broke gpsd_error_model(), as well as a ton of regression tests.
> That led to not just a few compensating changes.  I could not figure any way 
> to
> change just a few things at a time.  So I ended up with a pretty large change 
> to
> the way driver_nmea0183 decides the current fix mode.  Also changes to the
> error modeling.
> Seems like a lot of the error modeling was just plain broken with NMEA, and
> likely some other drivers.
> The results just feels a lot better.
> The end result was just pushed to git head.
> Please test.
> ---------------------------------------------------------------------------
> 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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