code: func (networkBus *NetworkBus) Start() error {
  	var err error
  	service := networkBus.service
  	clientService := networkBus.Client.service
  	serverService := networkBus.Server.service
  	if !service.started {
  		server := rpc.NewServer()
  		server.RegisterName("ServerService", serverService)
  		server.RegisterName("ClientService", clientService)
  		server.HandleHTTP(networkBus.path, "/debug"+networkBus.path)
  		l, e := net.Listen("tcp", networkBus.address)
  		if e != nil {
  			err = fmt.Errorf("listen error: %v", e)
  		}
  		service.wg.Add(1)
  		go http.Serve(l, nil)
  	} else {
  		err = errors.New("Server bus already started")
  	}
  	return err
  }
docs: // Start - helper method to serve a network bus service