[aprssig] VARA modem replacing APRS tocall

[Heikki Hannikainen]

Hi,

I've just learned that the VARA HF modem is replacing the APRS destination 
callsign with "APVARA".

For example, if you use APRSIS32 with a VARA HF modem, APRSIS32 sets a 
tocall of APWW11 and sends the packet to VARA modem software, which 
replaces APWW11 with APVARA. This is apparently done to save a few bytes 
on the slow HF link.

If APRSIS32 is configured to also send the packet to the APRS-IS, there 
will be two different copies of the packet, both will be received by other 
APRS stations, and the original APRS software model cannot be detected any 
more.

https://github.com/aprsorg/aprs-deviceid/issues/123

Just thought this should be brought up for other APRS software developers 
to discuss, and for awareness of the side effects. I'm not particularly 
delighted by this implementation choice. Don't shoot the messenger.

   - Hessu