RE: An Ethernet question

[Broadfoot, Kieran J]

Its worth bearing in mind that both TCP and UDP talk over IP. IP does the
routing of messages across a network hence addressing is handled at this
level. UDP and TCP can both do point to point and broadcast but differ in
that TCP is an acknowledged protocol which requires more overhead. Given
the nature of xAP UDP makes more sense and it should be simpler to
implement
in smaller devices.

see <a href="http://tunnel.mrq3.com/explain/node2.html";>http://tunnel.mrq3.com/explain/node2.html</a>
for further details

kieran


-----Original Message-----
From: Ian Bird [mailto:<a
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Sent: Thursday, September 11, 2003 9:53 AM
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Subject: [xAP_developer] An Ethernet question


Hi all

I have been looking into writing my own Ethernet receive etc.
routines on my AVR to go with the Wiznet hardware. Anyway, since xAP
is a broadcast thingy does this mean it uses UDP all the time. From
what I gather UDP means the IP (source I assume) and message as well
as some other stuff is passed to the micro on the end whereas using
TCP/IP only information for the target IP (assigned to the micro)
gets through.

I think this means that TCP/IP is a connection based medium and UDP
is broadcast? Is that correct?

If so, when writing a PC based application do you somehow specify the
method used to send a xAP message in the program?

Sorry, no PC experience on this stuff

Thanks

Ian



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