function TcpConnection(socketId) {
    this.socketId = socketId;
    this.socketInfo = null;

    // Callback functions.
    this.callbacks = {
      disconnect: null, // Called when socket is disconnected.
      recv: null,       // Called when client receives data from server.
      sent: null        // Called when client sends data to server.
    };

    log('Established client connection. Listening...');

  }
Holds a connection to a client

@param {number} socketId The ID of the server<->client socket