Non-APRS AX25 digipeater problem

[LU7WA]

Hi everybody, I'm trying to set up APRX to work as a digipeater, both for APRS and plain AX25 traffic. I've been doing some tests and I can't make it work (APRS traffic gets digipeated but regular ax25 doesn't get through).

This is the simplest config that I've tested:

# /etc/aprx.conf

#
# AX25 RF digipeater only configuration
#

mycall LU7WA-1

<logging>
   pidfile /var/run/aprx.pid
   rflog /var/log/aprx/aprx-rf.log
   aprxlog /var/log/aprx/aprx.log
</logging>

<interface>
   ax25-device   $mycall
   tx-ok        true   # transmitter enable defaults to false
</interface>

<beacon>
</beacon>

<digipeater>
    transmitter     $mycall
    <source>
       source        $mycall
       relay-type    digipeated
    </source>
</digipeater>

As you can see, I'm using kernel AX25 support for the radio interface, which is working fine (tested listen, axcall, beacon, etc..).

If anyone has found a working config for this it will be really appreciated.

Thanks in advance.

Gustavo - LU7WA

Patagonia

Argentina

[John Gorkos]

I’d need to go back and look, but I’m fairly certain APRX only deals with UI (unnumbered information) frames, whereas most “packet radio” applications use I (Information-Transfer) format packets.

 

If you’re using a KISS-style modem with linux, and have created an ax0 interface at the network level, you can have as many programs as you’d like attached to that interface, the same way you can have multiple processes using any other network interface (i.e. eth0).  The ax0 interface is promiscuous in the sense that everything heard on the channel is passed through to any process with an open socket.

 

I don’t know of any “plain AX25” digipeating software that runs on Linux right off the top of my head, but I’m sure it’s out there.  Bottom line is that you should use APRX for what it does (process APRS traffic) and another program to handle your AX25 digipeating needs.

 

As an aside, the idea of running APRS and standard packet over the same channel should be abhorrent.  I’m curious your use case…

 

John Gorkos

AB0OO

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[Gustavo Conrad]

Hi John, thanks for your comments. I'm aware of the possibilities of using kernel ax25 support in the way that provides a network interface for general use. The only software that I've used in the past to digipeat general AX25 traffic was digi_ned but it seems that is not supported anymore (even the web site is down).  Recently I've found a new reference to axdigi (very old) but I couldn't make it work in my system.

You are right, i didn't stated correctly in my post but UI (unproto) traffic does get repeated by APRX, not only aprs packets.  The problem is with "connected" packets only.

Regarding you comments about running standard packet and aprs on the same frequency, I have to say that I live in a very unpopulated area, there are just 4 or 5 stations running packet/aprs in range so the traffic is very low, 99% of the time only a couple of fixed stations/beacons and no mobiles. I think that being able to use one frequency for everything could help to attract more stations to these modes because not everyone has the chance to put 2 stations on the air simultaneously.  Add to that the fact that some folks are on 145.825 MHz 24x7 they would need 3 stations to cover it all....  Anyways we are working aprs and packet on separated frequencies. I just wanted to keep using aprx to handle all the "terrestrial" traffic.

Thank you very much John, I really appreciate your help.

Best.

Gustavo - LU7WA

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[David Ranch]

I have a working APRX digipeater configuration for connected-mode packet covered here:

   http://www.trinityos.com/HAM/CentosDigitalModes/hampacketizing-centos.html#19d.aprx

--David
KI6ZHD

[Gustavo Conrad]

Hi David, I've been checking your documentation and I think it's great!  I've followed your instructions pretty closely (i'm using Slackware) and I got the package built and installed. I also did a review of my aprx.conf file following your sample config and ultimately started a new config from scratch.  Still no luck in getting "connected" packets repeated by my system.  I'm sure I'm missing something.... I will check everything from the bottom up.

Thank you so much for your comments.

73

Gustavo - LU7WA

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