iOS Question [Solved] Problem with silent push and firebase

[schimanski]

I have changed my ios-app to firebase-push service and I'm using silent push and fetch download. I understood the silent-push, that the

Sub Application_RemoteNotification (Message As Map, CompletionHandler As CompletionHandler)

is also raised, when the app is in the background and not killed from the user over the taskmanager.

But I have now mentioned, that my app doesn't receive silent-push messages, when it is in the background. For some times (not always), it is possible to send a push for max one minute after the app was set to background, but after that, the app is again not reachable. The app is always in the user-list.

After activating the app, every push-message arrives, so that no message is lost.

Im using the

#PlistExtra: <key>UIBackgroundModes</key><array><string>fetch</string><string>remote-notification</string></array>

and the newest main-file from fetch-download.

Is it possible, that apple changed something in the last updates?

I have also checked it with the releaselogger, but no result...

Edit: If i call fm.fcmdisconnected in application_background, no push will arrive, if the app is in the background. If i don't use fcmdisconnect, i will receive push for a few seconds, i think as long, as the os kills the app. It seems, that with killing the app by os, the fm is disconnected and the firebase-push doesn't launch the app. Under apn, it was no problem...

 

[Erel]

Have you compiled your app in release mode?

 

[schimanski]

Yes....

 

[Erel]

Seems like the certificates are not configured properly and you only receive messages through FCM and not through APN. It is worth testing it with regular notifications and see whether they arrive.

My guess is that you are using the wrong certificate with your app.

 

[schimanski]

I only use FCM. Do i have to use both? FCM and APN? I thought, that fcm could replace apn...

 

[Erel]

You only need to use FCM. However under the hood FCM works with APN.

Are you calling:

 App.RegisterUserNotifications(True, True, True)
 App.RegisterForRemoteNotifications

 

[schimanski]

Thank you, I try it with a new certificate...

 

[schimanski]

It is worth testing it with regular notifications and see whether they arrive.

I have tested it with regular notifications and it works normal, the alerts arrived all time.

Before I try to renew all certificates, perhaps someone could take a look at my servercode. Perhaps, i made a mistake:

Public Sub SendMessageTo(Devices As List, msg As Map)
    Try
        Dim sb As StringBuilder
        sb.Initialize
        For Each t As String In Devices
         sb.Append($"'${t}' in topics ||"$)
        Next
        sb.Remove(sb.Length-3, sb.Length) 'will fail if topics is empty
        Dim m As Map = CreateMap("condition": sb.ToString)
       
        Dim Job As HttpJob
        Job.Initialize("fcm", Me)
        Dim m As Map = CreateMap("condition": sb.ToString)
       
        Dim data As Map = CreateMap("content-available": 1, "steuerbefehl": msg.Get("steuerbefehl"), "konferenz": msg.Get("konferenz"), "absender": msg.Get("absender"), "sender": msg.Get("sender"), "filename": msg.Get("filename"), "daten": msg.Get("daten"), "zeitstempel": msg.Get("zeitstempel"), "groesse": msg.Get("groesse"))

        m.Put("data", data)

        Dim jg As JSONGenerator
        jg.Initialize(m)
        Job.PostString("https://fcm.googleapis.com/fcm/send", jg.ToString)
        Job.GetRequest.SetContentType("application/json;charset=UTF-8")
        Job.GetRequest.SetHeader("Authorization", "key=" & Main.FirebasePushApiKey)
    Catch
        Main.Logger.logsFATAL(LastException.Message)
    End Try
End Sub

 

[Erel]

1. Try it with:

m.Put("data", data)
m.Put("content_available", True)

2. If it doesn't work then try to disable the fetch feature and remove the modified main file.

 

[Erel]

Are you using a local builder? If so, which version of Xcode?

 

[schimanski]

Are you using a local builder? If so, which version of Xcode?

No, I'm using host builder. I have tried

m.Put("content_available", True)

,

m.Put("content-available", True)

,

removing fetch, removing fetch with

m.Put("content-available", 1)

, but always the same problem. The client is not reachable after a short time...

 

[Erel]

Implement this sub and see whether there are any errors:

Sub Application_PushToken (Success As Boolean, Token() As Byte)
Log($"PushToken: ${Success}"$)
Log(LastException)
End Sub

 

[schimanski]

Sorry for the late reply, but I was short of time.
It works! With the help of Erel and mystic and in succession of the following thread

https://www.b4x.com/android/forum/threads/no-firebase_notifications-while-in-background.72228/
https://www.b4x.com/android/forum/threads/no-firebase_notifications-while-in-background.72228/
i got the firebase-push at work in the background. After renewing all the certs and provision-files from the beginning and with the syntax

m.put("content_available", True)

("content-available", 1 doesn't work),

silent-firbase-push works in the background.

Thanks for your efforts!