Start method starts the transport. Your implementation should connect to remote peer, and call Connected notification upon successful completion. If there were problems with the connection, it should call Disconnected notification.

Whenever state changes in your transport engine, you should fire StateChanged notification as well.

Typically, you can use Role argument to define if your peer will Listen and accept, or Initiate connections. Since you define transport implementation, you decide how will Role argument affect each peer in your implementation.