[Xastir] NMEA GPS data duplication

[James Ewen]

That's where the problem lies with all of these suggested solutions.
As far as I know, the KPC line will not duplicate the GPS data out the
TNC serial port. I have never seen a way to do that, but I'd love to
be proven wrong.

The APRS data can be found on the serial connector that allows the TNC
to talk to the computer bidirectionally. The GPS data is picked up an
a psuedo serial port that was hacked into the unit when APRS started
wanting to grab GPS data while also tied into a computer.

I don't think you're going to be able to get at that GPS data without
some code added to the KPC firmware. Chances of that happening are
pretty low.

James
VE6SRV


On 7/1/09, Lee R. Burton <lburton at mrow.org> wrote:
> Well I am using a KPC3+ not a D7 or D700, but anyway, I could do any number
> of the below things.. upon looking at the code it wouldn't actually be hard
> to get the data and send it out via a pipe or socket, but if it's incomplete
> (only the one sentence) that would be disappointing... I don't have it in
> front of me now, so I will have to see what the KPC3+ does when I get in the
> car/home.
> Thanks,
> Lee Burton
> lburton at mrow.org
> 301 910 0246
>
> ----- Original Message -----
> From: Tom Russo <russo at bogodyn.org>
> To: Fred Hillhouse <fmhillhouse at comcast.net>
> Cc: 'Xastir - APRS client software discussion' <xastir at lists.xastir.org>
> Sent: Wed, 1 Jul 2009 16:57:03 -0400 (EDT)
> Subject: Re: [Xastir] NMEA GPS data duplication
>
> On Wed, Jul 01, 2009 at 04:44:44PM -0400, we recorded a bogon-computron
> collision of the <fmhillhouse at comcast.net> flavor, containing:
>>
>> > The ideal would be if the D700 passed *all* NMEA strings
>> > without being told which one to select from the GPS stream.
>> > But it doesn't.  And at this point, Xastir has no way of
>> > doing periodic commands to the TNC to change the type.
>>
>> Interesting! The other day I was playing with a D7 (borrowed) and when I
>> turned on GPSMON and set GPSTEXT to GPRMC it sent all the sentences
>> anyway.
>> The manual mentions the GPMC string is used only for the LTEXT command.
>
>> Of course the D7 is not the D700.
>
> Could be an important difference.  The D700 startup script we have for
> Xastir
> doesn't actually have GPSMON in it, and I know it never passes anything but
> the one sentence that's set in GPSTEXT.
>
> Just looked at the D700 manual, and GPSMON is not listed in the TNC
> commands.
> It does mention something about LTEXT, but it is in fact the case that
> GPSTEXT
> limits what NMEA sentences are passed to Xastir.  And if you watch the
> packet
> monitor, you can see that the APRS firmware is clearly sending GPSTEXT
> commands
> periodically, as the pmon shows "GPSTEXT was GPGGA" and "GPSTEXT was GPRMC"
> all
> the time.
>
> Guess the D7 has a different TNC command set.  Or GPSMON is undocumented in
> the
> D700.  But if that were the case, one would expect that the APRS firmware
> would
> make use of it instead of issuing all those GPSTEXT commands.
>
> --
> 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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