refresh method

Implementation

Future<void> refresh() async {
  if (!available) {
    error = 'The ESP32 bridge is available in desktop builds only.';
    _notify();
    return;
  }

  loading = true;
  error = null;
  _notify();
  try {
    final List<Esp32Device> found = await _api.listDevices();
    devices = found;
    if (found.isEmpty) {
      selectedPath = null;
    } else if (!found.any((Esp32Device d) => d.path == selectedPath)) {
      // Prefer the board over an unrelated adapter when both are plugged in.
      selectedPath = found
          .firstWhere(
            (Esp32Device d) => d.espressif,
            orElse: () => found.first,
          )
          .path;
    }
  } catch (e) {
    error = 'Could not list serial ports: $e';
  } finally {
    loading = false;
    _notify();
  }
}