Cool idea!  This could be extended to include geo-fencing.  A message gets sent 
to any station, or a specific station, that reports from within a specified 
area.  You could define "warning areas" and "danger zones" for flooding or 
other hazards.

Or send a message to someone else if a specific call sign enters or leaves a 
defined area or crosses a boundary.  If a rider has gone outside the race 
boundary for example.

Or run a script on a call sign entering or leaving an area; e.g. a 
home-automation script that starts the coffee maker because you're almost home.

Time schedules and limits could be defined for any of the above.

Gee, we could go crazy with this!  :-)

Craig
n6yxk

On Dec 3, 2009, at 7:15 PM, Chip G. wrote:

> I'm not up for attempting to code this right now, but just thought I'd 
> mention it in case any one was interested. One of the many functions/features 
> of Xastir and APRS is the ability to send messages to other APRS users. But 
> often the station you'd like to send a message to is not there at the time. 
> Xastir has a good decay routine for resends, but the delay between attempts 
> can get quite long. What if there was the ability to send a delayed message. 
> And because APRS has the ability to know when a station "checks-in," why not 
> link the message send to the receipt of a new position (or other) packed from 
> the desired station.
> 
> So for example, if I want to send to my wife's car (N1MLG-4), but she hasn't 
> left work yet. I would bring up the delayed message window. I would enter in 
> her callsign & SSID and then the message and click send. Xastir would begin 
> to monitor and as soon as the next packet was received it would send the 
> message back by either the default path, by the return path, or by a path I 
> specify. A fancy variation would include an abort option (if not sent within 
> the specified time it aborts lets the user know).
> 
> Thanks for considering the idea,
> 
> 
> 73,
> --de Chip (N1MIE) FN41bn
> 
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