[MMO - Everquest] How to connect Unity to a non-unity Server?

Question

I'm stuck on MMO-Multiplayer networking for my Project in Unity3d Webplayer.

I have the complete server-side done, and a Unity build with all the assets. The problem is that I need the two to communicate with eachother, probably through UDP Sockets, but have no idea where to start.

The server is an opcode + struct based network stack, each 'opcode' does a different option in the game. the protocol itself has different opcodes and the network stack is entirely UDP.

Server Source - https://github.com/EQEmu/Server

Client Source - https://github.com/eqbrowser/eqbrowser

Live Build - http://eqbrowser.com/