[aprssig] APRS-IS and metadata

Lynn W Deffenbaugh (Mr) KJ4ERJ at arrl.net
Sat Aug 19 11:04:55 EDT 2023

To understand the "server infrastructure", you need to read all of the 
pages at:


In there you will see:

> To make this as painless as possible to APRS software authors at the 
> time, it was decided to use simple, low-level TCP socket connections 
> and pass CR/LF delimited lines using the TNC2 monitor format 
> (SENDER>DEST,PATH:rest of packet).

And because the same format is used for client connections as for server 
connections, and the fact that there are a great many diverse clients 
and servers out there, some of which are no longer supported but still 
in wide-spread use (read: UI-View), the only thing that is expected 
and/or propagated along the APRS-IS connections are actual packets.   
There is no room in the existing specification for extension beyond that 
because clients are expecting every CR/LF delimited line to be a packet.

If you want to start something like "APRS 2.0", then you'll need to 
bring your own entire infrastructure to the table as well.   The 100s of 
existing APRS-IS servers and clients will likely not appreciate changes 
in their underlying packet and connection traffic formats.   (Ok, 100s 
is a slight exaggeration according to https://status.aprs2.net/)

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 8/19/2023 5:48 AM, Borja Marcos wrote:
>> On 18 Aug 2023, at 17:18, Lynn W Deffenbaugh (Mr)<KJ4ERJ at arrl.net>  wrote:
>> Please remember that the "APRS" has NO database!   Sites like findu.com and aprs.fi are run by individuals of their own free will on their not-so-free hardware and bandwidth.
> But there is a server infrastructure linking iGates together, or am I wrong?
> What I intend is to make all the data more useful.
> 73,
> Borja, EA2EKH
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> aprssig at lists.tapr.org
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