SerialPortReader re-subscription

[jpnurmi]

How can I substitute the stream in SerialPortReader after re-plug the USB and the stream observers don't have to re-subscript the stream again?

Originally posted by @fynxiu in #3 (comment)

[jpnurmi]

libserialport opens serial ports in exclusive mode, but does not disable the exlusive mode when closed. This means, you'll get an error "Device or resource busy" (EBUSY) when trying to re-open a serial port. I have proposed a patch to fix that a good while ago but unfortunately there's been zero activity there: sigrokproject/libserialport#5

[jpnurmi]

It's a bit clumsy, but technically, you could now pause & close on error, and then re-open & resume:

class MySerialPortReader {
  final SerialPortReader _reader;
  StreamSubscription<Uint8List> _subscription;

  MySerialPortReader(SerialPort port) : _reader = SerialPortReader(port) {
    _subscription = _reader.stream.listen(_receiveData, onError: _handleError);
  }

  void _receiveData(Uint8List data) {
    print('==> $data');
  }

  void _handleError(Object error) {
    print(error);
    _subscription.pause();
    _reader.port.close();
    _keepRetryingAsAnExample();
  }

  void _keepRetryingAsAnExample() {
    Timer.periodic(const Duration(seconds: 5), (timer) {
      if (_reader.port.openReadWrite()) {
        _subscription.resume();
        timer.cancel();
      }
    });
  }
}