Yeah, I assumed you'd be using the Ethernet connection, not the 232 - but to my knowledge, the 3rd party interface behavior would be the same. I'd stick with the ethernet interface and not even bother with the 232 (although the lan bridge may be capable of that? But I don't think it is... I think the TCP multiplexing feature only works on the ethernet interface).
Here is a link to the device if you haven't seen it. http://www.commandfusion.com/wiki2/s...t-multiplexing
There may be other solutions, including ones you could build yourself. I understand the 3rd party interface to RA2 very well, and I can't see any reason why a multiplexed connection wouldn't work, assuming that the client software is simply sending commands and reacting to monitoring data. I guess there is a small chance that the client software could be making a synchronous socket connection to the repeater - and this would be problematic as the multiplexed clients could then interfere with each other - but I would not expect that to be the case. Now, there are some things in the Home+ software that I'm not familiar with - like the scene editing functions. It is possible that this functionality does depend on having an individualized connection to the repeater. I don't think this part of the interface is published in the integration guide, so I don't know how that works under the hood. It might be worth wiresharking that, and seeing how it works. It might simply be editing the XML file on the repeater - in which case it'd be a non-issue as it'd be using the web port for those communications. Not sure... hopefully someone from Lutron can chime in on this and explain how Home+ does the download, uses synchronous or asynchronous socket, and the mechanism to edit scenes on the repeater.
I think maybe the next thing to do is find some software that will do this multiplexing and then test out multiple clients through that multiplexed connection. If that works, then getting a hardware solution in place (or leaving the software running if you are ok with that) is a good path forward. I found one project on the internet for this, but it's just C source code. I didn't find anything else. http://sourceforge.net/projects/tcpm...?source=navbar
Good luck!