[aprssig] Weird Behavior on the APRS-IS

Heikki Hannikainen hessu at hes.iki.fi
Tue Feb 18 00:20:29 CST 2014


On Mon, 17 Feb 2014, Stephen H. Smith wrote:

> I then noticed that KJ4ERJ's ISS object originates with  fourth.aprs.net.  I 
> then thought maybe I could cut out some delays and latency by logging into 
> fourth and getting as close to the source as possible.     When I connected 
> to fourth, I got NOTHING !

I investigated this one just now. aprsc's APRS object decoder has a silly 
little bug, it doesn't handle objects having HHMMSSh timestamp - only 
DDHHMMz. The ISS object has a HHMMSSh timestamp and aprsc doesn't take 
that as a valid object, so the object filter won't pass it on.

The bug is simple, and the fix is simple too, I'll release a new version 
soon.

   - Hessu



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