[Xastir-Dev] question regarding my track

[Curt Mills, WE7U]

On Fri, 21 Feb 2003, Chris Bell wrote:

> The fundamental issue seems to be that track points generated by
> moving my station (by whatever means, in the usual case GPS, either
> local/tnc/gpsd) are treated differently than the a point received from
> an echo (digipeat).  Should they?

I don't think they should be any different.  I believe what you are
seeing is that until the packets go through the decode routines in
db.c, they aren't seen by Xastir.

The code should send out packet _and_ fling a packet into the decode
routines as well (kind of like a local loopback interface).  Perhaps
these locally flung packets aren't getting flung?  Also perhaps
they're not getting flung fast enough.


> Operational example:   I have a GPS on the radio port of my kpc-3+.
> Fire up xastir, drive down the road.  My icon (which track-me turned
> on, but does not seem to make a difference)

It does make a difference as you get close to the map edge.  If it's
not on, you won't flip to the next map view.


> hops along down the road
> with each GPS poll.  I have no colored track though.  Once I finally
> get an echo back from a digi, I suddenly start drawing a trail,
> following the gps updates.

Seems to be that our local loopback is broken?


> Things get even stranger with DR turned on.  My icon gets
> dead-reconned, but the DR ghost is drawn with the current speed and
> heading, starting from the current icon position (which are all tracking
> the GPS).  Only after a successful digi echo does the DR track get
> reset to 0.  [so even though the ghost position has no meaning at all
> in a DR context, it did show me how long "ago" I had a good echo.

We should probably disable DR for our own station.


> I first noticed this testing some gpsd related issues, if I was not
> connected to the TNC (or net) I never drew a track.  I could fix it by
> connecting to something and getting a digipeat.  Another way to fix it
> was to load a log, either from disk or findu that had my station
> moving around.  Then the gps track would follow me around.

I might take a look at this sometime this weekend as well.  Putting
a Garmin in simulator mode and driving myself around the map is a
pretty good way to do it.  Let me know if you find something so that
we don't duplicate efforts.  I'll do the same.

-- 
Curt Mills, WE7U                    hacker_NO_SPAM_ at tc.fluke.com
Senior Methods Engineer/SysAdmin
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