[Xastir] SHOW OF HANDS REQUESTED: Davis Weather Station users (Tom Russo)

Sat Aug 4 16:46:52 EDT 2012

On Sat, Aug 04, 2012 at 01:14:47PM -0700, we recorded a bogon-computron collision of the <aa9vi at yahoo.com> flavor, containing:
> It's still an issue with the since 24 hr and since midnight totals.? Tom has been great trying to help but the code is very overwhelming.? There might have to be significant work on it.? I frankly think like Tom does that the wx.c code needs to be overhauled.? The really unfortunate thing is that the Davis Weatherlink for APRS does an AWESOME job of formatting the APRS string for serial output into the linux box nearly exactly the way we'd like to see on an outgoing WX packet from Xastir.? But, Xastir doesn't even take the processed rain since midnight and rain in last 24 hrs from the weather station, instead it is taking the current rain and adding it up as it goes along, processing the output for rain since midnight and rain in last 24 hrs. wx.c is doing more work than it has to for Davis only because of the way it is structured for the other weather stations.? So, yeah, it'd be a pain in the but to restructure the whole thing to help Davis users
>  get accurate data.? ... that's unless some crafty case structure can be developed.

I have not worked on it at all since we last spoke, but I've thought on it
a bunch.  I've simply been too busy to do any coding.

What I'm thinking is that the Meteo (and LaCrosse) code should be modified
to emit the total rain (so Xastir can display total rain), but that 
Meteo/Lacrosse and Davis APRS Data Logger code should be modified so that 
Xastir uses th 24-hour, since-midnight, and 1-hour data the station provides
directly without overwriting it.  I don't even think it will be that much work,
just a matter of maintaining a flag that says "the data in these strings
should not be recomputed."

While a complete rewrite of the wx.c code is in order (it's an abomination),
it should not require that to get this working.  What it requires is a little
spare time, which is in short supply on this end right now.

> --- On Fri, 7/20/12, xastir-request at lists.xastir.org <xastir-request at lists.xastir.org> wrote:
> 
> From: xastir-request at lists.xastir.org <xastir-request at lists.xastir.org>
> Subject: Xastir Digest, Vol 80, Issue 5
> To: xastir at lists.xastir.org
> Date: Friday, July 20, 2012, 11:00 AM
> 
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> Today's Topics:
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> ???1. SHOW OF HANDS REQUESTED:? Davis Weather Station users (Tom Russo)
> ???2. Re: SHOW OF HANDS REQUESTED:? Davis Weather Station users
> ? ? ? (Curt, WE7U)
> ???3. Re: SHOW OF HANDS REQUESTED:? Davis Weather Station users
> ? ? ? (Tom Russo)
> ???4. Re: SHOW OF HANDS REQUESTED:? Davis Weather Station users
> ? ? ? (Curt, WE7U)
> ???5. Re: SHOW OF HANDS REQUESTED:? Davis Weather Station users
> ? ? ? (John Ronan)
> ???6. Re: SHOW OF HANDS REQUESTED:? Davis Weather Station users
> ? ? ? (Tom Russo)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 19 Jul 2012 14:26:40 -0600
> From: Tom Russo <russo at bogodyn.org>
> To: xastir at xastir.org
> Subject: [Xastir] SHOW OF HANDS REQUESTED:? Davis Weather Station
> ??? users
> Message-ID: <20120719202640.GA10923 at bogodyn.org>
> Content-Type: text/plain; charset=us-ascii
> 
> I've been working for a while with Mike Swiatkowski, AA9VI who reported some
> time ago that his Davis APRS Data Logger rain data was improperly handled by
> Xastir.
> 
> I seem to have found the issue, and gave Mike a patch that seems to have
> solved the problem for him.? But if it's correct, it means that all the Davis
> weather code has been wrong for a very, very long time.
> 
> Is there anyone here who's got a Davis weather unit, has been using it with
> Xastir, and who can work with me to test handling of rain data --- which 
> sorta implies you're in a rainy season right now?
> 
> The fix may also require changes to the Meteo and LaCrosse codes, because
> if I'm correct about what's wrong with the DataLogger, then these may have
> problems, too.
> 
> Mike was seeing odd resetting of rain data, and I believe this is because
> the Davis code is bypassing some record-keeping that is done by the code for
> other weather stations --- and the result is that Xastir's internal computation
> of 24 hour, 1-hour, and since-midnight rain are broken.? But to fix that,
> one has to assure that Xastir's being told the "total rain" in the right
> way, and that Xastir is calling its record-keeping routines even for Davis
> weather stations.
> 
> I'm not yet convinced that I have it all right, even though Mike reports his
> strange behavior has stopped with my patch.
> 
> I am unable to test anything rain-related here --- not only do I not have a 
> Davis unit (I have a LaCrosse), but I live in New Mexico.? We only get about 
> 7" of rain a year, and I'm invariably away from the computer on the day it 
> happens.
> 
> -- 
> Tom Russo? ? KM5VY???SAR502???DM64ux? ? ? ? ? http://www.swcp.com/~russo/
> Tijeras, NM? QRPL#1592 K2#398? SOC#236? ? ? ? http://kevan.org/brain.cgi?DDTNM
> "And, isn't sanity really just a one-trick pony anyway? I mean all you get is
>  one trick, rational thinking, but when you're good and crazy, oooh, oooh,
>  oooh, the sky is the limit!"? --- The Tick
> 
> 
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-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
 one trick, rational thinking, but when you're good and crazy, oooh, oooh,
 oooh, the sky is the limit!"  --- The Tick