You can take a look at the protocol by installing a protocol analyzer like
http://www.ethereal.com/

However, the hard part with writing a bot player is not network related. The bot needs to maintain the game state somehow, and given that the protocol is not a true distributed simulation protocol, but rather a command distribution protocol, you would need a write a virtially identical state machine as RTW. Pretty hard without using the source ;)

Much easier to just write an RTW clone and you'll have full freedom of choice for AI and network algorithms :)