You may want to check http://salut-a-toi.org/ http://salut-a-toi.org/ then (I'm working on it), we have a similar architecture and it's a very active project, X

You may want to check http://salut-a-toi.org/ http://salut-a-toi.org/ then (I'm working on it), we have a similar architecture and it's a very active project, XMPP only though.