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[aprssig] APRS-XO proposal

Scott Miller scott at opentrac.org
Thu Jan 10 16:06:35 UTC 2008


If anyone's going to write a transmit-only tracker application, can it 
PLEASE use UDP?  If it's not kept open all the time, a TCP connection is 
going to require 3 packets to connect, 1 packet for data, and 3 packets 
to disconnect.  And keeping it open all the time probably isn't a good 
idea for a device that might be moving from one network to another all 
the time.  You probably don't want old positions stuck in buffers, either.

With UDP, you just throw a single packet on the wire and it either gets 
where it's going or it doesn't.  There's no state to track, no 
continuing memory usage, and no connection overhead.

Scott
N1VG

Robert Bruninga wrote:
>> Now Bob's asking someone to write a dumb 
>> internet-transmit-only tracker!
>> The XO isn't the only platform for such 
>> a  beast...
> 
> Yes, it makes the laptop APRS application so trivial for any
> laptop that has wireless access.  Doesn't need any of the
> receive, decode, display, maps or anything.  Just get that live
> from FINDU.COM. or APRSworld or any of the others.  Done!
> 
> Should be only a few K of code.  Its only display is a set-up
> dialog box, and a text message window.   wow...
> so who is going to write it?
> 
> See the proposal on
> http://www.ew.usna.edu/~bruninga/APRS-OLPC.html
> 
> I have updated the suggested set-up dialog box so that the
> format is a little more standardized to include name and the
> type of station (home, work, etc).  It will also allow any APRS
> symbol to be used if this is run on any laptop or PC, but if it
> is run on the XO laptop, then we want it forced to be the APRS
> symbol for the XO laptop only.
> 
> Bob, Wb4APR
> 
> 
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