List devices = await SerialportFlutter.listDevices();

  List devices = await SerialportFlutter.listDevicesPath();

bool openResult = await SerialportFlutter.open('/your/device/path', baudrate, dataBits, parity, stopBits);
bool closeResult = await SerialportFlutter.close();

await SerialportFlutter.write(Uint8List.fromList("Write some data".codeUnits));

await SerialportFlutter.runAsRoot("chmod 666 /your/device/path");