🐛 [firebase_messaging] Silent Notifications not working on iOS if app is terminated

[iosephmagno]

Hello,
We already discussed silent notifications on ios in foreground and background mode and I shared our working solution in #8277.

Now above thread is closed, so I’m forced to open this other one.

Situation is:

Android: silent notifications work in all scenarios: app in foreground, background and killed.

ios: silent notifications work in foreground and background mode, but dont work when app is killed IF app is not the last one opened.

[iosephmagno]

Hi @russellwheatley maybe you have more of a clue than me on that?

[iosephmagno]

I can add more details. After upgrading to 12.0.1 from 11.4.1, silent notifications on iOS work also when app is killed.
Unfortunately, notifications stop working as soon as we open a different app.
If we open our app back and kill it, notifications start working, and they stop working as soon as a different app is opened.

Setup is:
iphone 13
iOS 15.5
Flutter 3.0.3

Video below:
App is closed and messages are triggered. We open Rest app while keep sending messages, and notifications stop working.

IMG_1483.MOV

[iosephmagno]

Hello @darshankawar, any idea about this?

[DennisKragekjaer]

Its simply not ok. It seems like silent push is not working at all. They arrives when opening the app

[darshankawar]

@iosephmagno
For silent notifications + terminated state combination, according to this documentation section, the data notification in this case will be handled in onBackgroundMessage state, and, the function should be outside the main method to parse it.
Also, see this link for your reference and check if it helps.

[iosephmagno]

Hello @darshankawar
Yea our code is fine, in fact notifications work in all states: foreground, background and terminate.
We noticed that in terminate mode, notifications stop being fired as soon as we open another app after we killed ours, see here #9300 (comment)

Basically, in above video we kill our app and start sending messages to demonstrate that we do receive and show incoming silent notifications when app is terminated. But at some point we open another app (Rest app) and this causes our terminated app not being able to show incoming silent notifications anymore.

This is why we think it might be a bug of firebase_messaging. Can you please try to reproduce the issue on your side?

---

Here is our setup:

firebase_messaging: 12.0.1
iphone 13
iOS: 15.5 and 15.6
Flutter: 3.0.3

Notification Sample Payload:

{
admin.messaging().send({
token: "device token",
data: {

"title": "Silent Notification",

"body": "Hello World!",
},
// Set Android priority to "high"
android: {
priority: "high",
},
// Add APNS (Apple) config
apns: {
payload: {
aps: {
contentAvailable: true,
},
},
headers: {
"apns-push-type": "background",
"apns-priority": "5", // Must be 5 when contentAvailable is set to true.
"apns-topic": "com.******.presence", // bundle identifier
},
},
});

ios/runner/AppDelegate.swift

import UIKit
import Flutter
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
if #available(iOS 10.0, *) {
UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
}
GeneratedPluginRegistrant.register(with: self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
}

ios/runner/Info.plist

<key*>FirebaseAppDelegateProxyEnabled</key*>
<string*>NO</string*>
<key*>UIBackgroundModes</key*>
<array*>
<string*>remote-notification</string*>
</array*>