[aprssig] IGate Registering for ANSRVR (Messaging failures)

Steve Dimse steve at dimse.com
Fri Jul 15 12:01:34 EDT 2016

> On Jul 15, 2016, at 11:12 AM, Lynn W. Deffenbaugh (Mr) via aprssig <aprssig at tapr.org> wrote:
> PS.  If anyone can speak authoritatively on what criteria the other IGate software uses for gating messages from the APRS-IS to RF, I'd be all ears... er eyes and would love to be corrected or confirmed in my recollection that one of them can consider distance rather than used hops.
The intent very definitely was as Bob stated, it should be based on what the IGate hears as local, local being defined as heard in n or fewer hops in the last y minutes. n was to be adjusted to match the number of hops the outgoing message would be sent with. e.g if the TNC sends via WIDE,WIDE, n should be 2; if it uses VIA WIDE then n=1. y should be a few times greater than the longest beacon interval, say 120 minutes but this is not that critical.

I do not recall ever hearing about someone defining local as a distance, and if I had I would think I would remember. This is a bad idea. A hop may be 20 miles as in the Florida Keys, or 100 miles or more for a mountaintop digi. And if it is a wide coverage it is very likely not omnidirectional, so even with thought you could not program a single realistic distance to call local. 

I don't think I'd go as far as Bob to say this ruins the utility of messaging, but it does make it less reliable while adding no improvement that I can think of. Anyone doing this in their code should reconsider. 

Steve K4HG

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