Unsure if this is helpful at all, but CocoaAsyncSocket has been very helpful. 
We have a TCP and UDP QC plugin using them here:

https://github.com/v002/v002-Network

Perhaps it may be of some help?

On Nov 5, 2012, at 12:00 PM, Christophe Leske <[email protected]> wrote:

>> you don't want to do this.  Copying the data that you already have is
>> fairly pointless (it just means you're going to use twice as much
>> memory, and probably blow out your L2 cache, with nothing to show for
>> it but a warmer CPU and/or louder fan)
> 
> Hi Christopher,
> 
> thanks for the hint.
> 
> I know about the padding bytes in the rows, thanks for the warning.
> 
> 
> I must know set up a TCP socket connection with another machine. I am usually 
> working on C#, which is why I am so stumped in Objective-C...
> 
> Can I potentially set up my tcp connection to the target machine somwhere in 
> startExection or enableExecution?
> 
> Ideally, the connection should be existing and working, so that I can toss 
> out packets of every frame...
> 
> Usually, TCP connection are handled asynchronsouly - how is it done and 
> handled in Objective-C, and, more specifically, in Quartz Composer? I 
> understand that this is a multithreaded application?
> 
> Thanks,
> --
> Christophe Leske
> multimedial.de
> 
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