Re: [gpsd-dev] ✘GPSD_API

[Eric S. Raymond]

Gary E. Miller <address@hidden>:
> Yo Eric!
> 
> On Thu, 14 Apr 2016 04:00:31 -0400
> "Eric S. Raymond" <address@hidden> wrote:
> 
> > > I also have some other changes that likely need to go in gpsdata_t.
> > > For example, there are two distinct types of satellites_used and
> > > satellites_visible.  One type is the number reported by the GPS and
> > > the other is a could of sats seen so far in sucessive GPGSA dn
> > > GPGSV.  But gpsdata_t has place for only one type and they keep
> > > over-wrting each other...  
> > 
> > Fixing that will be not just incompatible but a significant design
> > change that we need to discuss carefully.
> 
> Well, let the discussion begin.  My short term fix was to just stop NMEA
> from over-writing the _used and _visible with direct GPS data, and fill
> them in when the GSA/GSV where done.  That was last week, no complaints
> yet.  Skyview working MUCH better.
> 
> I have been digging into the change, and found that _used and _visible
> are not even used by the gpsd clients!  Instead those numbers are
> recreated in the json client by counting up objects in the sats array.
> 
> I like that strategy, you know the actual counts will always match
> the totals.  Carrying core data, and derived data, often leads to
> discrepancies.
> 
> I'm not done with digging in all the corners, so please tell me if I
> missed anything.

Not that I can see.  I think you're on the right track.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

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