[Xastir] Davis Weather APRS Data Streamer

[clayj at nwlink.com]

Realizing I'm going "where angels fear to tread"; I'll start taking a look
at wx_fill_data.   I have a bit of spare time now that I'm in my new job
and settling down.   But, it will probably still be a while before I have
anything useful to show.

I'm also gonna check w/Davis and see if they have a copy of that APRS
routine for the WMII.

Clay
N7QNM


> Thanks Tom, the patch worked, and the data is coming into Xastir as
> expected.  I appreciate the effort :)
>
> -Mike
>
> On Sat, May 16, 2009 at 12:25 AM, Tom Russo <russo at bogodyn.org> wrote:
>
>> 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/<http://www.swcp.com/%7Erusso/>
>> 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
>>
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>>
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