Delay when receiving FCM

[FortySL]

Hello Flutters,
I am developing an app with realtime chat function. I prepare to use Cloud Firestore and Firebase Message for pushing notifications when new messages coming. However, there is a 5 mins - 10 mins delay when receiving FCM on my app. Is there any help I can get from here?

Best Regards.

Here is flutter doctor -v

`[✓] Flutter (Channel stable, 3.0.1, on macOS 12.4 21F79 darwin-arm, locale en-AU)
• Flutter version 3.0.1 at /Applications/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision fb57da5f94 (3 months ago), 2022-05-19 15:50:29 -0700
• Engine revision caaafc5604
• Dart version 2.17.1
• DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Users/bpc/Library/Android/sdk
• Platform android-31, build-tools 31.0.0
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.3

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

[✓] Android Studio (version 2020.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
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• Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.69.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.46.0

[✓] Connected device (4 available)
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• iPhone 13 Pro Max (mobile) • BD1C4B50-56F6-4165-8D80-75219A7C91D9 • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-2 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 12.4 21F79 darwin-arm
• Chrome (web) • chrome • web-javascript • Google Chrome 104.0.5112.79
! Error: LeiOvO is busy: Fetching debug symbols for LeiOvO. Xcode will continue when LeiOvO is finished. (code -10)

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Here is LocalNotificationService

class LocalNotificationService {
  static final FlutterLocalNotificationsPlugin _notificationsPlugin =
      FlutterLocalNotificationsPlugin();

  static void initialize(BuildContext context) {
    final InitializationSettings initializationSettings =
        InitializationSettings(
            android: AndroidInitializationSettings("@mipmap/app_icon"),
            iOS: IOSInitializationSettings(
              requestSoundPermission: false,
              requestBadgePermission: false,
              requestAlertPermission: false,
            ));

    _notificationsPlugin.initialize(initializationSettings,
        onSelectNotification: (String? payload) async {
      if (payload != null) {
        log('payload is $payload');
        Navigator.of(context).pushNamed(payload);
      }
    });
  }

  static void requestIOSPermissions() {
    _notificationsPlugin
        .resolvePlatformSpecificImplementation<
            IOSFlutterLocalNotificationsPlugin>()
        ?.requestPermissions(
          alert: true,
          badge: true,
          sound: true,
        );
  }

  static void display(RemoteMessage message) async {
    try {
      final id = DateTime.now().millisecondsSinceEpoch ~/ 1000;

      final NotificationDetails notificationDetails = NotificationDetails(
        android: AndroidNotificationDetails(
          "notification_channel_id",
          "channel",
          channelDescription: "notification channel",
          importance: Importance.max,
          priority: Priority.max,
          color: Colors.red,
        ),
        iOS: IOSNotificationDetails(),
      );

      await _notificationsPlugin.show(
        id,
        message.notification!.title,
        message.notification!.body,
        notificationDetails,
        //pass to top
        payload: message.data["route"],
      );
    } on Exception catch (e) {
      print(e);
    }
  }
}

Here is initState() in MyApp

` LocalNotificationService.initialize(context);

FirebaseMessaging.instance.getInitialMessage().then((message) {
  log('I am init');

  if (message != null) {
    final routeFromMessage = message.data["route"];

    Navigator.of(context).pushNamed(routeFromMessage);
  }
});


//for foreground cloud message
FirebaseMessaging.onMessage.listen((message) {
  log('I am on');
  if (message.notification != null) {
    log(message.notification!.body!);
    log(message.notification!.title!);
  }
  LocalNotificationService.display(message);
});

//app is in the background but still in open status (stop status)
FirebaseMessaging.onMessageOpenedApp.listen((message) {
  log('I am init');
  final routeFromMessage = message.data['route'];
  log(routeFromMessage);
  LocalNotificationService.display(message);
  //Navigator.of(context).pushNamed(routeFromMessage);
});

// gives you the message on which user taps
// and it opened the app form terminated state

//ios part permission
FirebaseMessaging.instance.requestPermission().then((value) {
  log('Setting: $value');
});
FirebaseMessaging.instance.getToken().then((token) {
  log('Token: $token');
});
FirebaseMessaging.instance.getAPNSToken().then((APNStoken) {
  log('APNStoken:$APNStoken');
});`

[FortySL]

This situation did not exist before when I was implementing another function. However, all FCM receiving have delays in my app now. I am wondering whether it is because my app gets larger and there are several stream listeners?🤔

[FortySL]

Those messages are current sent from Firebase Console.