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[aprssig] APRS Messaging

Pete Loveall AE5PL Lists hamlists at ametx.com
Thu Jul 29 10:27:32 UTC 2010

> -----Original Message-----
> From Stephen H. Smith
> Sent: Thursday, July 29, 2010 2:16 AM
> 	On Wed, Jul 28, 2010 at 11:56 PM, Adi Linden <adil at adis.on.ca>
> <mailto:adil at adis.on.ca>  wrote:
> 		I've read the docs you've recommended. I suppose I am
> interested in a lot more detail. In order
> 		for a message to make it from IS to RF, does the iGate need
> to listen to the complete IS data
> 		stream? Or is there a mechanism that allows an iGate to
> forward the "heard" list to upstream
> 		server(s) to establish a path for messaging?
> 	The IS is smart. It knows which stations have been heard by which
> 	IGates.
> Actually the APRS-IS does NOT make these decisions.   The decision to gate

You both are correct.  The APRS-IS server does not make the decision to gate to RF.  But the servers that support filtered ports do maintain a "last heard" list for each filtered connection.  This allows for proper messaging while using a limited feed, thereby allowing your client to work without being under the load of a full feed.


Pete Loveall AE5PL
pete at ae5pl dot net

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