[Xastir] Davis Weather APRS Data Streamer

[clayj at nwlink.com]

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?

Clay
N7QNM


> 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
>
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