Metaserver is at orpgmeta.appspot.com
For 'standard'. Check out the Traipse Metaserver: http://traipsemeta.madmathlabs.info/
I gave it a front end, and restored the room list functionality.
Server list is in a happily obvious XML format via HTTP
Port is always 6774 at the moment (though could potentially change in the future)
For 'standard'. With Traipse you can set the port in your server_ini.xml file.
Actual messages between client and server consist of a 32-bit binary message length, followed by message data in XML or some close variant thereof
The entire data is sent as a binary message. It is packed and then unpacked. The length is sent first so the receiver knows how much is there to unpack. Once unpacked it is string data and contains XML data (as a string)
To explain what I have in mind, I'm currently evaluating the feasibility of writing a web-based client that would do for OpenRPG gaming what Mibbit does for IRC gaming, that is, to solve problems like "game on tonight, but the only machine I can access at the moment belongs to the college lab/Internet cafe/my sister and I don't have permission to go installing software" or "erg, my install of the client software ain't working at the moment and I'd rather play now and fix it later than miss the game while I'm troubleshooting".
What protocol changes do you have in mind for Traipse? I'm looking forward to seeing the new version, but it seems it would be a pity to break backward compatibility and the current felicitous state of affairs where some people in a group can upgrade to the new client program even if others do not?
I would really like to talk to you further about this off the boards if that is possible. A friend of mine is looking into something much the same and we are having a small hurdle of finding team members. Find me on skype (?) as profebral and we can chat at length.