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[aprssig] APRS Message Idea

Jason Winningham jdw at eng.uah.edu
Thu Mar 3 14:52:05 UTC 2005


On Mar 3, 2005, at 8:21 AM, Robert Bruninga wrote:

> It should have been in all code.

I just took a look at the spec (1.0.1 was the latest I found at 
tapr.org) and googled for "aprs message decay algorithm" and found 
nothing that would be useful for me if I were implementing a client.  
If it's not in the spec, you can't blame clients for not implementing 
it.

> But then it decays down to one retry every 30
> minutes until the station eventually comes on the air.

What I was looking for was the maximum number of times a message would 
be sent (assuming the message wasn't ACKed).  I assume there is some 
maximum number of times a message will be transmitted, otherwise the 
entire network would have degraded into nothing but messages and 
collisions.

> With APRSdos the message will always eventually get
> delivered.

Does this mean it retries forever?

-Jason
kg4wsv





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