content: //import 'dart:convert';
  
  import 'package:flutter_reactive_ble/flutter_reactive_ble.dart';
  import 'package:permission_handler/permission_handler.dart';
  
  Future<String> sendInstruction() async {
  
      final flutterReactiveBle = FlutterReactiveBle();
  
      //final _serviceUuid = Uuid.parse("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
      //final characteristicUuid = Uuid.parse("beb5483e-36e1-4688-b7f5-ea07361b26a8"); 
      //var deviceId;
  
      String devices = "";
  
      var status = await Permission.location.request();
  
      if (status.isGranted) {
  
          flutterReactiveBle.scanForDevices(withServices: [], requireLocationServicesEnabled: false ).listen((device) {
                  devices += device.id;
                  }, onError: (e) {
                  print("👋 " + e.toString());
                  return e.toString();
  
                  });
  
      }
  
      return devices;
      //flutterReactiveBle.connectToDevice(id: deviceId);
  
  
      //final characteristic = QualifiedCharacteristic(
      //        serviceId: serviceUuid,
      //        characteristicId: characteristicUuid,
      //        deviceId: deviceId,
      //        );
  
      //flutterReactiveBle.writeCharacteristicWithoutResponse(characteristic, value: Utf8Encoder().convert("LEFT"));
  
  }
  
  