[Xastir] Position data from Xastir not accepted by Yaesu FTM-400 or Direwolf
    Jason KG4WSV 
    kg4wsv at gmail.com
       
    Tue Oct 23 13:17:11 PDT 2018
    
    
  
On Tue, Oct 23, 2018 at 2:44 PM Tom Henderson <Tom at henderson4.us> wrote:
> Can you explain what you mean by "third party packet?"
Short answer, it's packet that's embedded in another packet. Usually
(only?) seen on-air when an Igate takes a packet from the network and
transmits over RF.
from  http://www.aprs.org/APRS-docs/PROTOCOL.TXT :
THIRD PARTY FORMAT:  One special format character } allows any APRS
packet to be carried or transmitted by any other station.  This is
what allows the both the ZIPLAN and IGATE messaging capability!  On
receipt of a 3rd party packet, the original header is dropped and the
packet is recursively parsed again, beginning at the {.  To show that
it has been carried by another station, the call of that station is
extracted from the as-received header and inserted  as a pseudo digi*
in the digi path.   Example:
    W3XYZ>APRS,DIGI*:}W4ABC>APRS,WIDE:>121234zStatus
will be processed as  W4ABC>APRS,WIDE,W3XYZ,DIGI*:>121234zStatus
Notice how the "carrying station" W3XYZ is inserted as if it had been
a digi in the path
also see
http://www.aprs-is.net/IGating.aspx
http://www.aprs-is.net/IGateDetails.aspx
-Jason
kg4wsv
    
    
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