[aprssig] APRS-IS Duplicate Packets

[Tapio Sokura]

On 3.5.2010 13:48, Pete Loveall AE5PL Lists wrote:
> content (there is some attempt by javAPRSSrvr to reduce these
> duplicates, but if the trimmed packet shows up first, as in this
> case, there is not much that can be done).  If your packets do not

Why can't the filtering work both ways? Currently when deciding what is 
a duplicate I consider the sender callsign-ssid, target callsign and the 
body of the packet. The body is considered up to the first cr or lf 
encountered, not including the cr or lf itself. Also all white space 
immediately preceding the cr or lf is dropped from the duplicate 
checksum calculation. This seems to catch most duplicates, except those 
packets that have passed through igates or digis that drop or replace 
certain byte values (0-31 or above 127 usually) from the body.

   Tapio