"iOS users have reported that notifications from Firebase have mysteriously ceased to

Question

"iOS users have reported that notifications from Firebase have mysteriously ceased to

Yesterday evening, I was experimenting with Push Notifications from Firebase on my iOS application and everything was functioning correctly.

I successfully sent a notification from a Cloud Function to a specific FCM token. However, this morning, notifications are not being received using the same process.

Cloud Function

Below is the function I am using to send the notification:

function sendNotification(title: string, body: string, token: string): Promise<void> {
    const message: admin.messaging.Message = {
        apns: {
            headers: {
                'apns-priority': '10'
            },
            payload: {
                aps: {
                    alert: {
                        title: title,
                        body: body,
                    },
                    sound: "default"
                }
            }
        },
        token: token
    }
    return admin.messaging().send(message).then(response => { console.log(`Notification response ${response}`) }).then(justVoid)
}

The `token` mentioned above is the token obtained from the InstanceId in the iOS app. After triggering this function, the Cloud Function log in the Firebase web console shows the following message:

Notification response projects/project-name/messages/0:1571998931167276%0f7d46fcf9fd7ecd

This appears to be a success message. However, despite this, the notification does not appear on the device.

iOS App

I have followed this troubleshooting guide and confirmed that the setup is correct: https://firebase.google.com/docs/cloud-messaging/ios/first-message?authuser=0

In an attempt to resolve the issue, I re-installed the app on the testing device and ensured that the following steps were completed after re-installation:

Call:

UNUserNotificationCenter.current().requestAuthorization(options:, completionHandler:)

Call:

UIApplication.shared.registerForRemoteNotifications()

Listen for updated FCM token by implementing:

func messaging(_ messaging:, didReceiveRegistrationToken fcmToken:)

Call:

InstanceID.instanceID().instanceID(handler:)

Double check that notifications are allowed for my application in the iOS settings app.

Test Notification from Console

I attempted to send a Test Notification from the Notification Composer, using the most recent FCM token for the test device. Unfortunately, this notification also failed to appear, and there was no visible feedback indicating whether it was successfully sent or not.

What could be causing this issue?

Any recommendations on how to troubleshoot and debug this problem?

ios typescript firebase firebase-cloud-messaging google-cloud-functions

Answer 1

Answer №1

It can be quite challenging to troubleshoot issues when dealing with Push Notifications.

In my own experience, it seems that there is nothing wrong with your typescript or iOS code since it was functioning correctly before. The issue with push notifications not working could potentially be related to the APNS certificate.

Here are some possible reasons why push notifications may not be working:

Ensure you have uploaded the correct APNS profile to the Firebase console for both development and release modes.
Verify that notifications are enabled in capabilities settings.

Your Project -> capabilities -> turn on Push Notifications
Make sure the correct GoogleService-Info.plist file has been added to the project.
Check that the APNS Certificate has not expired.
Ensure you are using the latest version of Firebase.
Set your device time to automatic, not manual.

If you still suspect a code-related issue and the above solutions do not work, you can try using the following wrapper class of HSAPNSHelper, which I have created and confirmed to work for iOS 10 and later.

import Foundation
import UserNotifications
import Firebase

class HSAPNSHelper: NSObject {

    static let shared = HSAPNSHelper()
    let local_fcm_token = "local_fcm_token"

    var notificationID = ""

    func registerForPushNotification(application:UIApplication){

        FirebaseApp.configure()

        self.getFCMToken()
        UNUserNotificationCenter.current().delegate = self
        UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .alert, .sound]) { (granted, error) in
            DispatchQueue.main.async {
                self.getFCMToken()
            }
        }
        application.registerForRemoteNotifications()
    }
}


extension HSAPNSHelper:UNUserNotificationCenterDelegate {

    fileprivate func getFCMToken() {
        InstanceID.instanceID().instanceID(handler: { (result, error) in
            if error == nil, let fcmToken = result?.token{
                print("FCM Token HS: \(fcmToken)")
                UserDefaults.standard.set(fcmToken, forKey: self.local_fcm_token)
            }
        })
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("didFailToRegisterForRemoteNotificationsWithError : \(error)")
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

        var token = ""
        for i in 0..<deviceToken.count {
            token = token + String(format: "%02.2hhx", arguments: [deviceToken[i]])
        }
        Messaging.messaging().apnsToken = deviceToken
        getFCMToken()
    }

    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

        let userInfo = notification.request.content.userInfo as! [String: Any]
        print(userInfo)
        completionHandler([.alert, .badge, .sound])
    }

    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        print(userInfo)
        self.notificationRedirection()
    }

    private func notificationRedirection(){

    }

    func fcmToken() -> String{
        return UserDefaults.standard.string(forKey:local_fcm_token) ?? ""
    }
}

How to implement?

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        //For implementing Push Notification
        HSAPNSHelper.shared.registerForPushNotification(application: application)
        return true;
    }

Use fcmToken() to retrieve the current FCM token.

Answer 2

It can be quite challenging to troubleshoot issues when dealing with Push Notifications.

In my own experience, it seems that there is nothing wrong with your typescript or iOS code since it was functioning correctly before. The issue with push notifications not working could potentially be related to the APNS certificate.

Here are some possible reasons why push notifications may not be working:

Ensure you have uploaded the correct APNS profile to the Firebase console for both development and release modes.
Verify that notifications are enabled in capabilities settings.

Your Project -> capabilities -> turn on Push Notifications
Make sure the correct GoogleService-Info.plist file has been added to the project.
Check that the APNS Certificate has not expired.
Ensure you are using the latest version of Firebase.
Set your device time to automatic, not manual.

If you still suspect a code-related issue and the above solutions do not work, you can try using the following wrapper class of HSAPNSHelper, which I have created and confirmed to work for iOS 10 and later.

import Foundation
import UserNotifications
import Firebase

class HSAPNSHelper: NSObject {

    static let shared = HSAPNSHelper()
    let local_fcm_token = "local_fcm_token"

    var notificationID = ""

    func registerForPushNotification(application:UIApplication){

        FirebaseApp.configure()

        self.getFCMToken()
        UNUserNotificationCenter.current().delegate = self
        UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .alert, .sound]) { (granted, error) in
            DispatchQueue.main.async {
                self.getFCMToken()
            }
        }
        application.registerForRemoteNotifications()
    }
}


extension HSAPNSHelper:UNUserNotificationCenterDelegate {

    fileprivate func getFCMToken() {
        InstanceID.instanceID().instanceID(handler: { (result, error) in
            if error == nil, let fcmToken = result?.token{
                print("FCM Token HS: \(fcmToken)")
                UserDefaults.standard.set(fcmToken, forKey: self.local_fcm_token)
            }
        })
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("didFailToRegisterForRemoteNotificationsWithError : \(error)")
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

        var token = ""
        for i in 0..<deviceToken.count {
            token = token + String(format: "%02.2hhx", arguments: [deviceToken[i]])
        }
        Messaging.messaging().apnsToken = deviceToken
        getFCMToken()
    }

    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

        let userInfo = notification.request.content.userInfo as! [String: Any]
        print(userInfo)
        completionHandler([.alert, .badge, .sound])
    }

    @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        print(userInfo)
        self.notificationRedirection()
    }

    private func notificationRedirection(){

    }

    func fcmToken() -> String{
        return UserDefaults.standard.string(forKey:local_fcm_token) ?? ""
    }
}

How to implement?

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        //For implementing Push Notification
        HSAPNSHelper.shared.registerForPushNotification(application: application)
        return true;
    }

Use fcmToken() to retrieve the current FCM token.

"iOS users have reported that notifications from Firebase have mysteriously ceased to

Answer №1

How to implement?

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