[aprssig] X-APRS: a new protocol in APRSdroid

Greg Trasuk trasukg at trasuk.com
Sat Apr 1 09:23:39 EDT 2017

At first I confess, I looked at the XML packet format and thought, “Are you F-ing serious?”.

And then I looked at the calendar.  You got me.


> On Apr 1, 2017, at 3:32 AM, Georg Lukas <georg at op-co.de> wrote:
> Hi all,
> in the past I've often realized that APRS-IS does not work well with
> mobile TCP/IP - latency on 2G or 3G causes delays that skew the position
> reports; interruptions in the data connection are almost impossible to
> detect at application level, and thus cause packet drops, etc.
> On the other hand, with my other project (yaxim, a mobile client for the
> Extensible Messaging and Presence Protocol / XMPP), all of these
> problems have been solved years ago. Now I have come to the conclusion
> that APRS and XMPP have many things in common:
> - They are both network protocols to send real-time GPS and message
>  packets.
> - They are mainly parsed by computers and displayed in a processed form.
> - Both have a vast network of distributed servers to distribute data.
> - For both, there are sophisticated web interfaces available.
> - etc.
> Therefore, I decided to bring together the best of both worlds and
> created X-APRS: a revival of APRS based on the XMPP protocol.
> You can find the protocol specification with color-coded examples here:
> https://aprsdroid.org/xaprs/
> Starting with the upcoming version 1.4, APRSdroid will only support
> X-APRS over TCP/IP and HamNet, and legacy ARPS will be slowly phased
> out.
> However, this should not be a problem, as the new protocol will also be
> supported by aprs2net and aprs.fi (expect separate announcements soon).
> Client and server developers are encouraged to jump in and implement the
> protocol, using one of the many available XMPP libraries.
> You can have a peek at the data stream by issuing one of the following
> commands:
> 	telnet xaprs.aprsdroid.org 20482
> 	telnet 20482
> 73 from Germany,
> Georg DO1GL
> -- 
> APRSdroid - Open Source APRS Client for Android | http://aprsdroid.org/m
> https://play.google.com/store/apps/details?id=org.aprsdroid.app | @APRSdroid
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