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Author Topic: Non-Positional Messages through Port 7879  (Read 3111 times)

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rob_milton

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Non-Positional Messages through Port 7879
« on: March 26, 2008, 09:58:45 pm »
I am attempting to write software to log (and reformat for another purpose) messages from Port 7879.  However, it appears that only messages containing lat/lon positional information are sent to this port.  Is this correct?  If so, is there any way for me to get messages that don't contain lat/lon positional information through Port 7879?

I also expermented with the message on Port 30003.  I have written software to log SBS-1 messages, and it seems to work on the RadarBox Port 30003 messages.  But I read in the forums that the format of these messages has not been standardized and may change.

Thanks for your help,
Rob Milton

Allocator

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Re: Non-Positional Messages through Port 7879
« Reply #1 on: March 26, 2008, 10:13:58 pm »
Rob,

The plan is for the Port 30003 output is for it to be compatible with the SBS-1 add-ons that use the data out from the SBS-1. However, as the add-on programs have been written by different people, they use different bits of information.

The port 30003 output from RadarBox will almost certainly change at some point, but not immediately.  Depending on how difficult it would be for you to change your program, it would be really interesting to see what you have produced.

Maybe go with a beta, but be prepared to change it?

The port 7879 output is an AirNav standard, so this is unlikely to change.  All the messages do contain lat/lon, but not only lat/lon, there is all the other relevant information too.

Here are 3 lines of data I've captured from port 7879 - although the data comes out as one long stream rather than separated like this.

<MODESMESSAGE><DATETIME>20080321142534</DATETIME><MODES>4006E6</MODES><CALLSIGN>CFE96C</CALLSIGN><ALTITUDE>28025</ALTITUDE><GROUNDSPEED>341</GROUNDSPEED><TRACK>330</TRACK><VRATE>0</VRATE><LATITUDE>52.9320</LATITUDE><LONGITUDE>-1.2899</LONGITUDE></MODESMESSAGE>

<MODESMESSAGE><DATETIME>20080321142534</DATETIME><MODES>4CA555</MODES><CALLSIGN>BCY500F</CALLSIGN><ALTITUDE>32000</ALTITUDE><GROUNDSPEED>336</GROUNDSPEED><TRACK>308</TRACK><VRATE>0</VRATE><LATITUDE>52.2806</LATITUDE><LONGITUDE>-3.8336</LONGITUDE></MODESMESSAGE>

<MODESMESSAGE><DATETIME>20080321142538</DATETIME><MODES>400B26</MODES><CALLSIGN>EXS897Q</CALLSIGN><ALTITUDE>07975</ALTITUDE><GROUNDSPEED>249</GROUNDSPEED><TRACK>079</TRACK><VRATE>3008</VRATE><LATITUDE>53.3793</LATITUDE><LONGITUDE>-2.3146</LONGITUDE></MODESMESSAGE>

Hope this helps

Allocator

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Re: Non-Positional Messages through Port 7879
« Reply #2 on: March 26, 2008, 10:18:37 pm »
This guy did some work with the port 7879 output from RadarBox, but I've tried emailing him and the address is not recognised.  The program has't been updated since Jul 2007. It does work, but sometimes crashes with an error message.

http://modesiceman.no.sapo.pt/

rob_milton

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Re: Non-Positional Messages through Port 7879
« Reply #3 on: March 27, 2008, 01:39:52 pm »
All the messages do contain lat/lon, but not only lat/lon, there is all the other relevant information too.

Allocator,

Thank you for the quick response...

I have been successful in getting the messages you described.  But I wasn't clear about what I'm looking for...

I am wondering if there is a way to get Mode-S messages through Port 7879 that DO NOT contain the lat/lon positional data.  ADS-B messages can contain lat/lon positional data.  Older Mode-S equipped planes transmit Mode-S data which does not contain lat/lon positional data.  And I would like to get these messages as well...

Is the data on Port 7879 limited to only messages that contain lat/lon positional data?

Thanks again for your help,
Rob

Allocator

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Re: Non-Positional Messages through Port 7879
« Reply #4 on: March 27, 2008, 01:49:38 pm »
Ahhh, right, I see what you mean now Rob.

I don't know if the non-positional messages come out on port 7879 - I'll do some capture and have a look.

Edit: In fact I can't do this at the moment, as the version of RB that I'm testing doesn't ouput anything to port 7879 at the moment.

However, looking at a couple of my port 7879 files, I don't think that there is any non-positional information there.  Non-positional data does come out of port 30003 though - the format is slightly non-standard at the moment and my change at some point in the future.

See this thread reference port 30003:

http://www.airnavsystems.com/forum/index.php?topic=679.0
« Last Edit: March 27, 2008, 02:17:42 pm by Allocator »

YARM.Armidale

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Re: Non-Positional Messages through Port 7879
« Reply #5 on: September 03, 2017, 10:53:40 am »
Hi Mr Allocator,
Any update on what port is now being used?
I'd like to feed my RB and RBPi to VRS (personal comparison use - not to feed some other place)
Regards,
yarm.armidale