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[aprssig] APRX aprs-is filtering

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Fri Aug 6 21:58:15 UTC 2010

Does javAPRSSrvr adhere to the spec statement about ignoring -SSIDs when 
receiving and displaying messages for a base callsign?  In other words, 
if an IGate has recently gated packets from KJ4ERJ-9, will messages for 
KJ4ERJ-12 be sent back out through that IGate for transmission?  I was 
going to provide a page reference from aprs101.pdf, but I don't see it 
there, but somewhere it describes that ALL stations with the base 
callsign should display received messages, but only the station with the 
matching -SSID should ack that message.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

Pete Loveall AE5PL Lists wrote:
> A quick clarification:
> The javAPRSSrvr sysops (aprs.net core servers and aprs2.net servers) use port 14580 as a user-defined filter port (no default filter).  If no filter is applied by the client, it functions properly for IGates (maintains a last-heard list for the client and performs proper message and related posit passing in addition to any messages and related posits for the logged in client).  A filter is not needed for proper IGate operation and will make your IGate software use much less resources than a full feed simply because there will be very few packets your IGate will have to process.
> Adding filters is best suited for GUI clients because you want to see more than just what you might see on RF.  Standalone and non-GUI IGates are best used on a user-defined port as you describe (port 14580) with no filter specified.  This will provide proper IGate operation while minimizing impact on your system and your bandwidth to the Internet.
> Hope this helps.
> 73,
> Pete Loveall AE5PL
> pete at ae5pl dot net
>> -----Original Message-----
>> From: Keith VE7GDH
>> Sent: Friday, August 06, 2010 12:30 PM
>> Some servers apply a default filter. Others will send you nothing if you
>> ask for nothing. I would really recommend that you read FILTER.TXT
>> and not just hope that the server that you connect to applies a default
>> filter, especially as you say that you are using rotate.aprs2.net:14580.
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