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This feature of the 14580 port allows IGates to run with no
specified filter and still be informed of stations that may have
been heard via RF, but are also beaconing directly via APRS-IS.
Such stations should not have their messages gated from -IS to RF
per number 4 at <a class="moz-txt-link-freetext" href="http://www.aprs-is.net/IGateDetails.aspx">http://www.aprs-is.net/IGateDetails.aspx</a><br>
<br>
<blockquote type="cite">
<p> Gate message packets and associated posits to RF if all of the
following are true:</p>
<ol>
<li>the receiving station has been heard within range within a
predefined time period (range defined as digi hops, distance,
or both). </li>
<li>the sending station has not been heard via RF within a
predefined time period (packets gated from the Internet by
other stations are excluded from this test). </li>
<li>the sending station does not have TCPXX, NOGATE, or RFONLY
in the header. </li>
<li>the receiving station has not been heard via the Internet
within a predefined time period.<br>
A station is said to be heard via the Internet if packets from
the station contain TCPIP* or TCPXX* in the header or if gated
(3rd-party) packets are seen on RF gated by the station and
containing TCPIP or TCPXX in the 3rd-party header (in other
words, the station is seen on RF as being an IGate). </li>
</ol>
</blockquote>
<br>
Without this feature from the APRS-IS server, there is no reasonable
way for an IGate to become aware of the dual-nature of other
stations.<br>
<br>
Your desire to show a map with only RF receptions is why APRSISCE/32
has the View / RF / All display filter. It provides a way for the
map to show ONLY those stations heard recently via RF and will not
show any residual stations that may have been updated from the -IS.
(View / RF / Local restricts to just recently local stations and
View / RF / Direct shows only those recently received with no hops
used).<br>
<br>
Lynn (D) - KJ4ERJ -Author of APRSISCE for Windows Mobile and Win32<br>
<br>
<br>
On 7/8/2012 1:49 PM, Pete Loveall AE5PL Lists wrote:
<blockquote
cite="mid:D2C9DA88A9F52C408B211291D2B6BB9B010F8D35EEFF@APPSRVR.colloc.ametx.local"
type="cite">
<pre wrap="">This is correct operation, not a bug. Port 14580 is an IGATE port. It maintains a last-heard list of stations you have gated to APRS-IS and will present those stations back to you if they are heard directly on APRS-IS or if there is a message routed to that station and associated posits.
Remember, when you create a filter, you are saying "I want these things in addition to what is normally served up on this port". Exception filters do not override the port's native functions. An IGate port always passes to the client all message packets (and associated posits) addressed to that client or addressed to a station that has been recently gated to APRS-IS by the client. It also passes to the client all packets from a station that was recently gated to APRS-IS by the client where those packets indicate they were directly injected into APRS-IS. The reason for this last part is so an IGate can determine if as station heard on RF also has a direct APRS-IS connection and, therefore, the IGate does not need to gate to RF messages for that APRS-IS connected station.
73,
Pete Loveall AE5PL
pete at ae5pl dot net
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: Stephen H. Smith
Sent: Sunday, July 08, 2012 11:58 AM
The only common thread I can see is that stations I once heard on RF and
igated
*TO* the APRS-IS later come back *FROM* the IS if: either their station is
beaconing on both RF and Internet, or if they beacon with an identical
callsign/SSID on VHF and enter the APRS-IS from another igate. This
happens
sometimes hours after HF propagation has caused the station to fade out on
HF.
It's not obvious this is happening when you just look at the map, but is
very obvious when you look at the station details and see "Q" constructs and
TCPIP components in the path.
</pre>
</blockquote>
<pre wrap="">_______________________________________________
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</pre>
</blockquote>
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