<div dir="auto">Please review this treatise on packet lengths inside APRS:<div dir="auto"><a href="http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/2016-November/046312.html">http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/2016-November/046312.html</a><br></div><div dir="auto"><br></div><div dir="auto">255 is better than "the best" you can do...</div><div dir="auto"><br></div><div dir="auto">de AB0OO</div><div dir="auto">John Gorkos</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 7, 2020, 1:36 PM Rafał Antas <<a href="mailto:antas.rafal@gmail.com">antas.rafal@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Guys,<div><br></div><div>Yea UDP package is working fine thanks for that! but it has some stupid limitation. ESPEasy GUI I think is not allowing more than 255 characters .. </div><div>if you want to send telemetry or more that that it is not allowing :(</div><div><br></div><div><br clear="all"><div><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Pozdrawiam,</div><div>Rafał Antas</div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">sob., 7 mar 2020 o 21:04 Nick VA3NNW <<a href="mailto:tapr@noseynick.com" target="_blank" rel="noreferrer">tapr@noseynick.com</a>> napisał(a):<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>John Gorkos wrote:<br>
</div>
<blockquote type="cite">
<div><span style="color:black">Instead of
using HTTP submit, use UDP packets, on port 8080.<u></u><u></u></span>
<p class="MsoNormal"><span style="color:black">The format is<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">user CALL pass
00000<linefeed><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black"><properly
formatted “on-air” packet><linefeed><u></u><u></u></span></p>
</div>
</blockquote>
<p>You're probably aware, but worth noting: UDP has no confirmation,
no ACKs, no retries, no reliability at all. It's certainly VERY
lightweight, your one over-the-air packet is creating exactly one
over-the-internet packet as well, but you're sending the packet
out, and have no idea whether it was received at the far end...</p>
<p>... on the other hand, the same can probably be said of all ham
radio, and APRS in particular, so if it already went over-the-air
unreliably, the UDP might be the least of your worries :-)<br>
</p>
<blockquote type="cite">
<div><span style="color:black">[...] A little
bit of solder and some wire, plus about 10 minutes of
programming will get you an internet enabled (or
APRS-over-TCPIP enabled) environmental sensor for under $7 a
piece.</span></div>
</blockquote>
<p>Very cool! I may have missed, have you shared all this online,
like on a github or anywhere? Would love to hack around with it
myself.<br>
</p>
<p>I've often referred to APRS as "IoT a quarter-century ahead of
its time" :-)<br>
</p>
Nick VA3NNW<br>
<pre cols="72">--
"Nosey" Nick Waterman, VA3NNW/G7RZQ, K2 #5209.
use Std::Disclaimer; <a href="mailto:sig@noseynick.net" target="_blank" rel="noreferrer">sig@noseynick.net</a>
Hacking's just another word for nothing left to kludge.
</pre>
</div>
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