characteristic.monitor().listen error while writeCharacteristic WithoutResponse as. my device is Notifiable

[philos3]

characteristic.monitor().listen throw an exception

my device is writewithoutresponse and is notifible ────────────────────────────────────────────────────────── flutter: dataCharacteristic: flutter: uuid: XXXXXXXXXXX(as example) flutter: isReadable: false flutter: isWritableWithoutResponse: true flutter: isWritableWithResponse: false flutter: isIndicatable: false flutter: isNotifiable: true ──────────────────────────────────────────────────────────

as i set true to peripheral.writeCharacteristic( , , , true, ), there is no error on Android but ios got an error while writeCharacteristic if i set false to peripheral.writeCharacteristic( , , , false, ), both android and ios got an error while monitor what is the correct way to monitor and writeCharacteristic?

here is the error message #####################

Unhandled error happened: Connection error has occured: - subscription called from:

characteristic.monitor().listen onError =====error:BleError (Error code: 201, ATT error code: null, iOS error code: null, Android error code: null, reason: Unknown error., internal message: null, device ID: CECAF6DD-73C5-B04C-EDE0-20B401AEF08B, service UUID: null, characteristic UUID: null, descriptor UUID: null)

here is my code ######################################## streamSubscription = characteristic.monitor().listen((readValue) { ///.... },onError: (error) { LogUtil.e("characteristic.monitor().listen onError =====error:${error.toString()}===============================",tag: getClassName()); catchCharacteristicError(error, null); } );

peripheral .writeCharacteristic( YsBleUuids.uuidService, YsBleUuids.clientCharacteristicWithNotifyAndWrite, Uint8List.fromList(value), false,///while my dataCharacteristic. isWritableWithoutResponse: true. so withResponse is false // transactionId:transactionId )

######################################## (base) philos:flutter_beauty zby0520$ flutter doctor -v [✓] Flutter (Channel stable, 2.2.3, on macOS 11.3 20E232 darwin-x64, locale zh-Hans-CN) • Flutter version 2.2.3 at /Users/zby0520/flutter/flutter • Framework revision f4abaa0735 (5 weeks ago), 2021-07-01 12:46:11 -0700 • Engine revision 241c87ad80 • Dart version 2.13.4 • Pub download mirror https://pub.flutter-io.cn • Flutter download mirror https://storage.flutter-io.cn

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) • Android SDK at /Users/zby0520/Library/Android/sdk • Platform android-30, build-tools 30.0.2 • ANDROID_SDK_ROOT = /Users/zby0520/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264) • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 12.4, Build version 12D4e • CocoaPods version 1.10.1

[✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Ultimate Edition (version 2020.1.3) • IntelliJ at /Applications/IntelliJ IDEA.app • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] Connected device (2 available) • XXXXX (mobile) • XXXXXX• ios • iOS 14.4 • Chrome (web) • chrome • web-javascript • Google Chrome 91.0.4472.114

• No issues found!

[sh3rlock97]

Hi

Were you able to fix your error? I'm also getting a 201-Error when listening to a Characteristic:

if (characteristic.isNotifiable) {
    print("Notifiable: ${characteristic.uuid}");
    characteristic.monitor().listen(
        (event) {
          print("listend and heared ${event}");
        },
        onError: (e) => print("Error monitoring disconnect $e"),
        onDone: () {
          print("Disconnect!");
          peripheral.disconnectOrCancelConnection();
        },
        cancelOnError: true);
  }