[Xastir] Okay, so it only transmits when the GPS interface isstarted?

[BobDonnell at arkalmus.com]

It's my recollection that this was a conscious design choice, since
typical immobile stations do not need to know where they are, i.e. have
a GPS connected and running on Xastir.  The idea here was that if GPS
was active, that there was a reason for having it active, and that the
program would consider an active GPS port to be an indication of having
a mobile station - and that if GPS data failed, that we didn't want to
have invalid position reports being transmitted.  Having GPS active for
other reasons, like time setting, etc. would normally be handled by a
different application.


73, Bob, KD7NM

>-----Original Message-----
>From: xastir-bounces at xastir.org [mailto:xastir-bounces at xastir.org]On
>Behalf Of Curt Mills, WE7U
>Sent: Wednesday, March 05, 2003 4:10 PM
>To: Jeff Laughlin
>Cc: xastir at xastir.org
>Subject: Re: [Xastir] Okay, so it only transmits when the GPS interface
>isstarted?
>
>
>On Wed, 5 Mar 2003, Jeff Laughlin wrote:
>
>> I was fooling around some more trying to figure out how to 
>make XASTIR
>> transmit my position. I realized that XASTIR WILL transmit 
>my position, if
>> it is receiving GPS data. This leads me to the conclusion 
>that XASTIR will
>> ONLY transmit my position if I am receiving GPS data. This 
>doesn't seem
>> like the correct behavior to me. What if I were entering my positions
>> manually? Even fixed stations beacon their position and status.
>
>I suspect it might be because you defined a GPS port.  If you don't,
>Xastir happily sends posits at the rate you specify.
>
>
>> I see, if I remove the GPS interface entirely, then XASTER 
>DOES transmit my
>> position. So current XASTIR behavior is:
>>
>> if ( gps interface exists )
>> 	if ( gps interface is recieving data )
>> 		beacon;
>> else
>> 	beacon;
>>
>> The CORRECT behavior IMO would be:
>>
>> if ( gps interface exists )
>> 	if ( gps interface is UP )
>> 		if ( gps interface is receiving data )
>> 			beacon;
>> 	else
>> 		beacon;
>> else
>> 	beacon;
>>
>> Because you may bring down the GPS interface but still wish 
>to transmit
>> your position. Like I did.
>
>Yep.  I concur with the "correct" algorithm.
>
>
>> I guess this would be more appropriate for the devel list. 
>But the docs
>> should probably reflect the fact that just having a GPS interface in
>> existence, whether it's up or down, causes XASTIR to NOT 
>beacon unless GPS
>> data is being received.
>
>Very nice debugging Jeff!  That's the sort of info that makes it
>much easier for the developers to find/fix problems.  I'll look into
>this one.
>
>-- 
>Curt Mills, WE7U                    hacker_NO_SPAM_ at tc.fluke.com
>Senior Methods Engineer/SysAdmin
>"Lotto:    A tax on people who are bad at math!"
>"Windows:  Microsoft's tax on computer illiterates!" -- WE7U
>"The world DOES revolve around me:  I picked the coordinate system!"
>
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