[Xastir] Davis Weather APRS Data Streamer

[Tom Russo]

On Sat, May 16, 2009 at 03:42:56PM -0700, we recorded a bogon-computron collision of the <clayj at nwlink.com> flavor, containing:
> Tom -- did you also fix the code that looks for a specific string at the
> end of the APRS data to determine what kind of station it is?

Looking at the documentation for the data logger, 
http://www.davisnet.com/product_documents/weather/manuals/07395-219_Adendm_06540.pdf,
it says that ".DsVP" is present at the end of all the strings from the 
logger.  Since that's what my patch looks for to determine that we're dealing
with that unit, I think it's OK.

What exactly are you asking?

I'm going to give Mike a few more days to beta test before I commit the thing.
If anyone else has one of these units, I'll provide the patch for them, too.

> > On Fri, May 15, 2009 at 10:31:05PM -0600, we recorded a bogon-computron
> > collision of the <russo at bogodyn.org> flavor, containing:
> >> On Fri, May 15, 2009 at 10:41:31AM -0600, we recorded a bogon-computron
> >> collision of the <k5mts.xastir at gmail.com> flavor, containing:
> >> > Hello all,
> >> >
> >> > I'm new to Xastir and love the software, and I have a question.
> >> >
> >> > With the new APRS Data logger for the Davis weather stations it is no
> >> longer
> >> > necessary to poll the station for data.  Additionally the unit can
> >> stream
> >> > data in APRS packet format as fast as every minute.  The data is
> >> formatted
> >> > as such:
> >> >
> >> > @151632z3500.03N/10620.88W_267/002g007t070r000p016P000h17b10219.DsVP
> >> >
> >> > Is there any chance of implementing this in Xastir?  It would
> >> certainly take
> >> > the headache out of trying to interface my station with MySql and the
> >> like.
> >> > Thanks in advance,
> >>
> >> Hmmmm.  I've been looking at this, and think that it would actually be
> >> even easier than I thought.
> >>
> > [...]
> >>
> >> Mike:  I can hack the code, but since I don't have such a unit I can't
> >> test it.
> >> But what I can do is try to hack it into my copy, make sure the hack
> >> compiles,
> >> and then shoot you a "patch" file and instructions for applying it.
> >> Then you
> >> can test it out and let me know if it works.  If it does, I'll commit
> >> it, and
> >> we can iterate if it *doesn't*.
> >
> > Patch sent.  Tested by sending Mike's example string (and several
> > variations
> > on it) to a little perl script that feeds data to a PTY and connecting
> > Xastir
> > to that PTY as if it were a Serial WX unit.  It was, in fact, very simple.
> >
> > If it works for Mike then I will commit it and wait for the bug reports to
> > come in.
> >
> > In doing this hackage, I notice that the WX decoding stuff is extremely
> > variable from one device to another.  In some blocks, the code attempts to
> > calculate wind chill and heat index using formulas --- but does so in
> > duplicated code for some device types and not others.  So the Davis/Meteo
> > code
> > computes wind chill from formulas, but not the heat index.  The RSWX200
> > code
> > gets wind chill from the unit, but computes the heat index.  The Peet
> > Ultimeter in "Complete" mode does exactly the same thing.  Every other
> > device
> > type simply doesn't fill in the heat index at all.  I hacked the
> > Davis/APRS
> > Datalogger code so it does both, but by copying the code in other blocks,
> > compounding the mess.
> >
> > This enormous "wx_fill_data" routine could use a serious refactor so it
> > can
> > reuse code instead of duplicating it.
> >
> > --
> > Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
> > Tijeras, NM  QRPL#1592 K2#398  SOC#236
> > http://kevan.org/brain.cgi?DDTNM
> >   In some cultures what I do would be considered normal.
> >                                   -- Ineffective daily affirmation
> >
> > _______________________________________________
> > Xastir mailing list
> > Xastir at lists.xastir.org
> > http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
> >
> >
> 

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
  In some cultures what I do would be considered normal. 
                                  -- Ineffective daily affirmation