I am getting error Unhandled Exception: MissingPluginException(No implementation found for method startScan on channel flutter_bluetooth_basic/methods)

[rohit0713]

I am not able to scan the bluetooth due to error

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method stopScan on channel flutter_bluetooth_basic/methods)
E/flutter ( 4507): #0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:332:7)
E/flutter ( 4507):
E/flutter ( 4507): #1 BluetoothManager.stopScan (package:flutter_bluetooth_basic/src/bluetooth_manager.dart:122:5)
E/flutter ( 4507):
E/flutter ( 4507): #2 PrinterBluetoothManager.stopScan (package:esc_pos_bluetooth/src/printer_bluetooth_manager.dart:67:5)
E/flutter ( 4507):
E/flutter ( 4507):
I/flutter ( 4507): Error starting scan.
E/flutter ( 4507): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method startScan on channel flutter_bluetooth_basic/methods)
E/flutter ( 4507): #0 BluetoothManager.scan (package:flutter_bluetooth_basic/src/bluetooth_manager.dart:85:7)
E/flutter ( 4507):
E/flutter ( 4507): #1 _nullDataHandler (dart:async/stream_impl.dart:517:1)
E/flutter ( 4507):
E/flutter ( 4507):

[rohit0713]

@andrey-ushakov Please help to fix the issue.

[singgihmardianto]

Hi there, can you give more context on this one? Maybe some code snippets?

Basically before you scan a bluetooth, please make sure:

1. You have list the permission in AndroidManifest.xml
2. Request the user permission

Remember that you will need to run on a real device instead of an emulator.

[rohit0713]

@singgihmardianto
Manifest Permissions:
android:name="android.permission.ACCESS_FINE_LOCATION"
android:name="android.permission.ACCESS_COARSE_LOCATION"
android:name="android.permission.WAKE_LOCK"
android:name="android.permission.BLUETOOTH"
android:name="android.permission.BLUETOOTH_ADMIN"
android:name="android.permission.BLUETOOTH_SCAN"
android:name="android.permission.BLUETOOTH_CONNECT"
android:name="android.permission.FOREGROUND_SERVICE"

Code:
Future scanDevices() async {
var status = await Permission.bluetoothConnect.status;
if (status.isDenied || status.isPermanentlyDenied) {
status = await Permission.bluetoothConnect.request();
if (!status.isGranted) {
Fluttertoast.showToast(msg: 'Bluetooth connect permission denied');
return false;
}
}
var res = await BluetoothEnable.enableBluetooth;
if (res == 'false') {
Fluttertoast.showToast(msg: 'Bluetooth permission denied');
return false;
}

status = await Permission.bluetoothScan.status;
if (status.isDenied || status.isPermanentlyDenied) {
  status = await Permission.bluetoothScan.request();
  if (!status.isGranted) {
    Fluttertoast.showToast(msg: 'Bluetooth scan permission denied');
    return false;
  }
}

status = await Permission.locationWhenInUse.status;
if (status.isDenied || status.isPermanentlyDenied) {
  status = await Permission.locationWhenInUse.request();
  if (!status.isGranted) {
    Fluttertoast.showToast(msg: 'Location permission denied');
    return false;
  }
}

_discoveredDevices.clear();
notifyListeners();
try {
  printerManager.scanResults.listen((results) async {
    _discoveredDevices = results;
    await Future.forEach(results, (element) {
      if (element.name == _selectedDevice?.name) {
        _selectedDevice = element;
      }
    });
    notifyListeners();
  });
  printerManager.startScan(const Duration(seconds: 4));

  printerManager.stopScan();
  notifyListeners();
  return true;
} catch (e) {
  print("Error scanning for devices: $e");
  return false;
}

}

And it was working last week but suddenly it started throwing exception while scanning the bluetooth

[rohit0713]

@singgihmardianto Actually I am getting error while scanning the bluetooth

[rohit0713]

@singgihmardianto It was working properly last week but suddenly it stopped working and throwing exception

[singgihmardianto]

@rohit0713 all seems good.. what version are you using? I am using esc_pos_bluetooth: ^0.4.1 and works well on my end. Have you tried to run flutter clean and flutter pub get?

[singgihmardianto]

@vishnudasRapidor what's your targetSdkVersion and compiledSdkVersion?

[rohit0713]

@singgihmardianto @vishnudasRapidor The issue is with the latest flutter version. It is not supporting in current flutter version.
I think dependency should update according to the latest flutter version.

[rohit0713]

@vishnudasRapidor In your project Use flutter 3.19.5 Version then it will work perfectly.

[singgihmardianto]

@vishnudasRapidor @rohit0713 yeah I think so. The only different with my machine is the flutter and dart version. Mine:
flutter 3.19.3
dart 3.3.1

I think the best solution right now is to downgrade the version and waiting support for the latest flutter version.

[ekarobyanto]

I'm experiencing this too and second if downgrade isn't an option for us

[delizondo]

I'm having the same problem, and downgrading Flutter is not an option for us

[delizondo]

Update: Migrated to esc_pos_bluetooth_updated and I can confirm the problem is not present. Just update the imports and thats it

[pennadl]

Update: Migrated to esc_pos_bluetooth_updated and I can confirm the problem is not present. Just update the imports and thats it

Running into this problem

Launching lib/main.dart on iPad (10th generation) in debug mode...
CocoaPods' output:
↳
      Preparing

    Analyzing dependencies

    Inspecting targets to integrate
      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
      Using `ARCHS` setting to build architectures of target `Pods-RunnerTests`: (``)

    Fetching external sources
    -> Fetching podspec for `Flutter` from `Flutter`
    -> Fetching podspec for `app_links` from `.symlinks/plugins/app_links/ios`
    -> Fetching podspec for `audio_session` from `.symlinks/plugins/audio_session/ios`
    -> Fetching podspec for `connectivity_plus` from `.symlinks/plugins/connectivity_plus/darwin`
    -> Fetching podspec for `device_info_plus` from `.symlinks/plugins/device_info_plus/ios`
    -> Fetching podspec for `flutter_bluetooth_basic_updated` from `.symlinks/plugins/flutter_bluetooth_basic_updated/ios`
    [!] No podspec found for `flutter_bluetooth_basic_updated` in `.symlinks/plugins/flutter_bluetooth_basic_updated/ios`

    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/external_sources/path_source.rb:14:in `block in fetch'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/user_interface.rb:64:in `section'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/external_sources/path_source.rb:11:in `fetch'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:997:in `fetch_external_source'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:976:in `block (2 levels) in fetch_external_sources'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:975:in `each'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:975:in `block in fetch_external_sources'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/user_interface.rb:64:in `section'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:974:in `fetch_external_sources'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer/analyzer.rb:118:in `analyze'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:422:in `analyze'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:244:in `block in resolve_dependencies'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/user_interface.rb:64:in `section'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:243:in `resolve_dependencies'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:162:in `install!'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/command/install.rb:52:in `run'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/claide-1.1.0/lib/claide/command.rb:334:in `run'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/lib/cocoapods/command.rb:52:in `run'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/gems/cocoapods-1.15.2/bin/pod:55:in `<top (required)>'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/bin/pod:25:in `load'
    /opt/homebrew/Cellar/cocoapods/1.15.2_1/libexec/bin/pod:25:in `<main>'

Error output from CocoaPods:
↳

    [!] Automatically assigning platform `iOS` with version `12.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.

Error running pod install
Error launching application on iPad (10th generation).

I tried everything here https://stackoverflow.com/questions/66236115/no-podspec-found-for-geolocator-web-in-symlinks-plugins-geolocator-web-ios

This is the output of

% arch -x86_64 pod install       

Analyzing dependencies
[!] No podspec found for `flutter_bluetooth_basic_updated` in `.symlinks/plugins/flutter_bluetooth_basic_updated/ios`