anchor.diff:      return completer.future;
     }
   
  +  /// Read data send from the serial port
     Stream<List<int>> get onRead {
       StreamController<String> controller = new StreamController();
       _onReadControllers.add(controller);
  
positive.code:     return completer.future;
    }
  
    // TODO rename sendString ?
    Future<bool> writeString(String data){
      _checkOpen();
      final completer = new Completer<bool>();
  
negative.code:   /// Getter for file descriptor (just for debug)
    int get fd => _ttyFd;
  
    /// Close the connection.
    Future<bool> close(){
      _checkOpen();
      final completer = new Completer<bool>();
  