<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body>The easy solution is: don't set _any_ filters. Filters to the APRS-IS specify additional extra traffic for your station to receive from the Internet, over and above the minimal traffic sent under the assumption you are running a Tx I-gate. Note there is no way to turn off that minimum traffic, as the APRS-IS assumes every client is a Tx I-gate.
<div><br></div><div>If you don't want extra traffic, don't ask for it. :-)</div><div><br></div><div>Andrew, KA2DDO</div><div>author of YAAC (a client program that can ask for additional APRS-IS traffic by default if set up for it)</div><br><br>-------- Original message --------<br>From: Wojtek SP9WPN <sp9wpn@gmail.com> <br>Date: 7/13/20 17:56 (GMT-05:00) <br>To: aprssig@lists.tapr.org <br>Subject: [aprssig] APRS-IS: frames bypassing server filter <br><br>Hello everybody,<br><br>I'm running a simple APRS-IS receiver (using direwolf). It uses a <br>metered GSM connection, so I try to control costs by reducing amount of <br>unnecessary or redundant data.<br><br>As I have no possibility to Tx from this location, it is an obvious step <br>to stop any frames being sent from APRS-IS server to my client (they <br>will never be forwarded to RF). But here the problem appears: I've tried <br>setting different server-side filters without any success. It seems that <br>some frames always reach me despite applied filtering (mostly these are <br>same stations all the time). I've tried different tier2 servers, both <br>aprsc and javAPRS - no difference. This is short sample what I get in logs:<br><br>[ig>tx] SR9KFZ-2>APRX29,TCPIP*,qAC,T2POLAND:;SQ9RHX <br>*111111z5108.47N/01701.74E-PHG3360 Damian<br>[ig>tx] <br>SR7NSI>BEACON,TCPIP*,qAC,T2POLAND:;438.825-S*121515z5135.96N/01841.68ErC077 <br>-760 SR7SI op SQ7PGP<br>[ig>tx] <br>SR7NSI>APNW01,TCPIP*,qAC,T2POLAND:@121515z5135.60N/01844.02E#432,500MHz <br>op SQ7PGP KZK TEAM<br>[ig>tx] SQ9NKH-9>APK101,SR9POD*,WIDE1*,W2-1,qAR,SR9NSK::SQ7LQU-9 :73!{Q<br>[ig>tx] SQ9NKH-9>PP0PP0,SR9POD*,WIDE1*,W2-1,qAR,SR9NSK:'vX<0x1c>l <br><0x1c>>/]"3r}op.Lukasz 73!<br>[ig>tx] OK8UOF>APMI06,TCPIP*,qAC,T2LONDON::OK8UOF <br>:PARM.Vin,Rx1h,EffTot,Eff1h,Temp,O1,O2,O3,O4,I1,I2,I3,I4<br><br>I know that my station is supposed to transmit messages to any station <br>which was heard previously, but these are not messages - mostly <br>telemetry and beacons. I can't find any common factor in these frames, <br>but there are not completely random (most of the are from SP, OK, OL, <br>but occasionally some from I or S5 appear, so there's some geographical <br>connection). I've tried to find the reason or rule which causes them to <br>be sent, but no luck. Even on Polish APRS forum people are surprised I'm <br>getting lots of frames having set eg. b/SP9WPN-1 filter.<br><br>Could somebody with extent knowledge of APRS-IS shed some light on this? <br>Even if I can't ultimately block those frames, it would be great to <br>understand why they are forwarded from server to my station. Right now <br>it's a mystery for me.<br><br>Best Regards,<br><br>Wojtek<br><br>-- <br>73!<br>Wojtek SP9WPN<br><br><br>_______________________________________________<br>aprssig mailing list<br>aprssig@lists.tapr.org<br>http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org<br></body></html>