I have used a commercial stack for 8 bit microcontrollers (Micronet CMX) and as 
is, it would be a bad choice for timing because of the time it spends 
processing  packets before deciding if they are for itself or not. It could be 
modified but you need a developer license to get the source code, and it starts 
at $15,000. I believe.

Didier

Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: Bob Camp <li...@rtty.us>
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Fri, 28 Dec 2012 11:36 AM
Subject: Re: [time-nuts] clock-block any need ?

Hi

It's still an encapsulated stack that just coughs up the information after it's 
done this and that to it. How long the this and that takes is dependent on how 
busy the network is. It's going to watch packets on the net first and push data 
to the Arduino second. 

I'm beating on a similar part between posts. It *really* lags out as the 
traffic goes from near nothing to just a bit more than nothing. I'm not far 
enough into it to be able to put numbers on either measure. Looks like the 
units are in the thousands of bits per second range though. 

Bob

On Dec 28, 2012, at 11:18 AM, Jim Lux <jim...@earthlink.net> wrote:

> On 12/28/12 7:56 AM, Bob Camp wrote:
>> Hi
>> 
>> Everything I've seen on the Adruino are "single chip wonders". They 
>> encapsulate the entire TCP/IP stack on the external chip. That will make 
>> getting at anything pretty tough.
>> 
> 
> 
> Well, they also do UDP..(at least the Wiznet 5100 does)..
> I was wondering if the timing from "UDP datagram received" to "some signal 
> that Arduino sees" was deterministic at a useful level...
> 
> The Arduino code I've looked at seems to be at a "sockets" kind of interface 
> and there is an interrupt from the hardware when something arrives.
> 
> 
> 
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