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<div class="moz-cite-prefix">There have been periodic discussions
about "smart" or "reverse path" routing for messages, but it all
come down to the fact that just because your IGate heard a packet
via a given path doesn't mean that the reverse of that path will
get back to the station. You are better off relying on the
digipeater infrastructure to deliver packets than to try to thread
a packet's way back through a specific digipeater path, especially
when you consider congestion and packet collisions.<br>
<br>
Also, just because the most recent packet you received from a
station came from a certain set of digipeaters does not mean that
the station is actually still in that same path some time later
when a message may be addressed to him/her.<br>
<br>
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and
Win32<br>
<br>
On 3/6/2017 3:01 PM, Jess Haas wrote:<br>
</div>
<blockquote
cite="mid:CAHN_RKMnmfJKLDxwF9TR1a-39iLpDMdh=JoxS0BV-iF2q3L4Fw@mail.gmail.com"
type="cite">
<div dir="ltr">Maybe it is a stupid idea but I do think we could
do a bit better than a wide path. If we know a more specific
path can't we decrease channel congestion and QRM while
increasing range without needing any modification to the
digipeater infrastructure?
<div><br>
</div>
<div>Wouldn't the target station be more likely to receive the
message if it is only hearing it from the closest digipeater
instead of a bunch of them transmitting at the same time
creating QRM?<br>
</div>
<div><br>
</div>
<div>When a mobile station is right next to an igate and they
can hear each other directly why should we spam the whole
region with the traffic via digipeaters?</div>
<div><br>
</div>
<div><span style="font-size:12.8px">Also it allows for using
other stations not just digipeaters to extend your range for
receiving messages not just transmitting. So if im in a
valley and cant hit/hear a digipeater I can set the first
hop in my path to another station i can hit and then when an
igate tries to get a message back to me it will route it
through that station.</span></div>
<div><span style="font-size:12.8px"><br>
</span></div>
<div><span style="font-size:12.8px">-Jess</span></div>
<div><span style="font-size:12.8px"><br>
</span></div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Mar 6, 2017 at 10:11 AM,
Robert Bruninga <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:bruninga@usna.edu"
target="_blank">bruninga@usna.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="#0563C1" vlink="#954F72" lang="EN-US">
<div class="m_-6392113998207421724WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">APRS
by design will be digipeated by EVERY digipeater
that hears it. So if the one farther south hears
it, it is already going to digipeat it anyway.
Nothing you need to do to make that happen… </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">And
in SoCal, there are so many digis, that your path
should be just one hop and it will still hit every
digi that hears it that first hop.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Bob</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
aprssig [mailto:<a moz-do-not-send="true"
href="mailto:aprssig-bounces@tapr.org"
target="_blank">aprssig-bounces@tapr.<wbr>org</a>]
<b>On Behalf Of </b>Jess Haas<br>
<b>Sent:</b> Monday, March 06, 2017 1:08 PM<br>
<b>To:</b> TAPR APRS Mailing List<br>
<b>Subject:</b> [aprssig] Smart TX igate message
routing?</span></p>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Where I am located in Southern
California I can hit many digipeaters. For home
station beaconing setting a single one of them as
my route seems to be the way to go but for tx
message igating I was thinking it may make more
sense if the outgoing path was the one that the
station was last heard on. Has anyone implemented
anything like this?</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">For example the digipeater I
have the strongest path to may not be able to
get a message to a station farther south but I
can hear and hit a digipeater rather far south
that the station can hear easily. Also if I have
heard a station directly recently than I should
have no problem getting a message to them
directly even if they have moved some with my
basestation antenna and possibly higher power so
digipeating to the whole area may be
unnecessary.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Another advantage of this
would be that a station that is in an RF hole
such as a valley that can't hear or hit a
digipeater but has a path to another station
that can could set that station as a path and
messages would automatically be routed back to
them.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Thoughts?</p>
</div>
<div>
<p class="MsoNormal"> Jess</p>
</div>
</div>
</div>
</div>
<br>
______________________________<wbr>_________________<br>
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href="http://www.tapr.org/mailman/listinfo/aprssig"
rel="noreferrer" target="_blank">http://www.tapr.org/mailman/<wbr>listinfo/aprssig</a><br>
<br>
</blockquote>
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