[aprssig] IGate duplicate packet filtering (please don't)

Heikki Hannikainen hessu at hes.iki.fi
Mon Jul 18 03:47:01 CDT 2016


On Sat, 16 Jul 2016, SARTrack Admin via aprssig wrote:

> I have not looked at my SARTrack code in this area for years, but SARTrack 
> will simply send all incoming data from RF to the APRS-IS network, after 
> checking for duplicate packets.

Hi,

It should not be necessary to remove duplicate packets at the igate, since 
the APRS-IS servers will in any case do it for you.

It might be better that the APRS-IS servers do it instead, so that there 
will be a smaller amount of slightly different implementations of the 
duplicate filtering algorithm.

The APRS-IS servers also then have the option of learning information 
about the duplicates you hear via different paths, and do something smart 
about them in the future, maybe.

   - Hessu, AF5QT



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