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[aprssig] AX.25 RR bit test - Holy Grail?

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Fri Nov 30 19:16:31 UTC 2012


On 11/30/2012 2:10 PM, Heikki Hannikainen wrote:
> On Fri, 30 Nov 2012, Jason KG4WSV wrote:
>
>> IMO, it's a mistake to shove layer 3+ data into layer 2 (data link) 
>> fields, both for specific reasons
>> like Andrew points out, and just on general principle.
>
> Second that. It would be *wrong* to do that, and it would not work 
> with existing software some of which would either ignore the bits 
> (loosing information), or ignore the packets having those set (even 
> worse).
>
> Also, there is no construct in the APRS-IS packet format to embed the 
> values of those bits in the APRS-IS stream.
>
> It's better to put APRS extensions in the APRS protocol, instead of 
> reusing bits in the AX.25 protocol.

Wholeheartedly support that opinion!  There's just WAY too many things 
using the TNC2 humanly readable packet format, not just the APRS-IS, 
that would need/benefit from access to this information.

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




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