Android Question [Solved] Firebase Messaging: No Data in Background and Log:"Missing Default Notification Channel metadata in AndroidManifest. Default value will ..

[Radiomodell]

Hallo all, I am converting an existing B4A App receiving and sending firebase notifications. This is due to discontinued Legacy HTTP Protokoll.
With HTTP v1 Api I can send "data style" messages. Recieving messages work with Firebasenotification Receiver as log as app is in foreground.
As soon as app is in background no data are received and log messages from Firebasenotification Receiver are no longer logged. Notifications are displaying "Title" and "Body" instead of received data. B4Ax Pages Main Page continues logging counter when in background.

Sub Process_Globals
    Private fm As FirebaseMessaging
    Dim BodyStr As String
    Dim myInt As Int
End Sub

'Called when an intent is received.
'Do not assume that anything else, including the starter service, has run before this method.
Private Sub Receiver_Receive (FirstTime As Boolean, StartingIntent As Intent)
    If FirstTime Then
        fm.Initialize("fm")
    End If
    fm.HandleIntent(StartingIntent)
End Sub

public Sub UnSubscribeFromTopics
    'fm.UnsubscribeFromTopic(ServGpsSms.FirebaseTopicName)
    fm.UnsubscribeFromTopic(B4XPages.MainPage.FirebaseTopicName)
End Sub

Public Sub SubscribeToTopics
    Log("FBM Subscribe to Topic: Topicname "& B4XPages.MainPage.FirebaseTopicName)
    fm.SubscribeToTopic(B4XPages.MainPage.FirebaseTopicName ) 'you can subscribe to more topics
End Sub


Sub fm_MessageArrived (Message As RemoteMessage)
    myInt= myInt +1
    Log(DateTime.Time( DateTime.Now)  &"------"& myInt &" -------->FBM Message arrived Title:"& Message.GetData.Get("dattitle"))
    'Log($"FBM Message data: ${Message.GetData}"$)
 
      
           If Message.GetData.Get("dattitle") = "ToDucato" Then
            BodyStr = Message.GetData.Get("datbody")
            Log("FBM BodyToDucato:"&BodyStr)
            CallSubDelayed2(B4XPages.MainPage,"ParseFirebaseMessage",BodyStr)
        End If
        CallSubDelayed2(B4XPages.MainPage,"ParseFBMTest",BodyStr)
 

        Dim n2 As Notification
        n2.Initialize2(n2.IMPORTANCE_HIGH)
        n2.Icon = "icon"
        n2.SetInfo(Message.GetData.Get("dattitle"),myInt, Main)
        n2.Notify(1)
    
End Sub

Logfile message when in background: Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.

18:37:07:182 SGPSSMS -----------FBAccesstoken: ya29.a0AfB...
 SGPSSMS T4Änderungsstring gesendet: 188;Fahrer...
Application backgrounded at: timestamp_millis: 1707241025203
18:37:07:492 SGPSSMS Job Success: Job.Getstring:
18:37:07:493SGPSSMS JobDone: ++++++++++++++++
Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.
18:37:08:186 Timer1 counter :15194
18:37:09:207 Timer1 counter :15195
18:37:10:210 Timer1 counter :15196
18:37:11:216 Timer1 counter :15197
SGPSSMS Bluetoothzähler: 0
SGPSSMS   TTTTTTTT VorAbfragesenden: Topic  Duc...
 SGPSSMS NachAbfragesenden
18:37:12:186 SGPSSMS xxxxxxxxxxJson String: {"message":{"topic":"Duc...
18:37:12:188 SGPSSMS -----------FBAccesstoken: ya29.a0AfB...
 SGPSSMS T4Änderungsstring gesendet: 188;Fahrer...
18:37:12:234 Timer1 counter :15198
18:37:12:556 SGPSSMS Job Success: Job.Getstring:
18:37:12:557SGPSSMS JobDone: ++++++++++++++++
Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.
18:37:13:254 Timer1 counter :15199
18:37:14:264 Timer1 counter :15200
18:37:15:273 Timer1 counter :15201
18:37:16:286 Timer1 counter :15202
SGPSSMS   TTTTTTTT VorAbfragesenden: Topic  Duc...
 SGPSSMS NachAbfragesenden
18:37:17:196 SGPSSMS xxxxxxxxxxJson String: {"message":{"topic":"Duc..
18:37:17:198 SGPSSMS -----------FBAccesstoken: ya29.a0AfB...
 SGPSSMS T4Änderungsstring gesendet: 188;Fahrer...
18:37:17:307 Timer1 counter :15203
18:37:17:596 SGPSSMS Job Success: Job.Getstring:
18:37:17:597SGPSSMS JobDone: ++++++++++++++++
Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.
18:37:18:324 Timer1 counter :15204
18:37:19:345 Timer1 counter :15205
Starter Timer6 Aufruf
18:37:20:360 Timer1 counter :15206
18:37:21:381 Timer1 counter :15207
SGPSSMS Bluetoothzähler: 0
SGPSSMS   TTTTTTTT VorAbfragesenden: Topic  Duc...
 SGPSSMS NachAbfragesenden
18:37:22:196 SGPSSMS xxxxxxxxxxJson String: {"message":{"topic":"Duc...
18:37:22:198 SGPSSMS -----------FBAccesstoken: ya29.a0AfB...
 SGPSSMS T4Änderungsstring gesendet: 188;Fahrer...
18:37:22:400 Timer1 counter :15208
Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.
18:37:22:558 SGPSSMS Job Success: Job.Getstring:
18:37:22:558SGPSSMS JobDone: ++++++++++++++++
18:37:23:408 Timer1 counter :15209
18:37:24:422 Timer1 counter :15210

As soon as app is in foreground messages arrive correct and notifications display data again.

Public Sub SendMessage(Topic As String, Title As String, Body As String)
    Log("SGPSSMS   TTTTTTTT VorAbfragesenden: Topic  "& Topic & " :" & FirebaseSenden & "  : " & SendFirebaseMessages & " : " &   FBAccessToken )
    If  FirebaseSenden And SendFirebaseMessages Then
        
        Log(" SGPSSMS NachAbfragesenden")
        Dim Job As HttpJob
        Job.Initialize("fcm", Me)
        
        Dim data3 As Map = CreateMap("priority": "high")
        Dim data2 As Map = CreateMap("dattitle": Title, "datbody": Body)
        Dim data1 As Map = CreateMap("title": "Title", "body": "Body")
        Dim data0 As Map = CreateMap("topic": Topic,"notification":data1,"data":data2,"android":data3)
        
        'generate JSON
        Dim data As Map
        data.Initialize
        data.Put("message",data0)
            
        Dim JG As JSONGenerator
        JG.Initialize(data)
        
        Log(DateTime.Time( DateTime.Now)  &" SGPSSMS xxxxxxxxxxJson String: " & JG.ToString)
        Job.PostString("https://fcm.googleapis.com/v1/projects/gps2smsv1/messages:send", JG.ToString)
        Job.GetRequest.SetContentType("application/json;charset=UTF-8")
        Job.GetRequest.SetHeader("Authorization", "Bearer " &   FBAccessToken)''' auth=<ID_TOKEN>"  https://firebase.google.com/docs/database/rest/auth
        Log(DateTime.Time( DateTime.Now)  &" SGPSSMS -----------FBAccesstoken: " &   FBAccessToken)
    End If
End Sub

Sub JobDone(job As HttpJob)
    
    If job.Success Then
        Log(DateTime.Time( DateTime.Now)  &" SGPSSMS Job Success: Job.Getstring:") '  &job.GetString)
        Log(DateTime.Time( DateTime.Now)  &"SGPSSMS JobDone: ++++++++++++++++ ")  '"&job)
    Else
        Log(DateTime.Time( DateTime.Now)  &"SGPSSMS JobDone: ---------------------- ")
    End If
    job.Release
    'StopMessageLoop '<-- non ui app only
End Sub

Erels Push Example shows same behavior: Messages including data when App is in foreground, no messages when App is in Background.

Tested App on Xiaomi Poco X3, Android 11 and Huawei P20, Android 9
B4A Version 12.80, Firebasenotifications Library Version 3.1

What am I doin wrong? Any ideas?

 

[Erel]

Are you sending the messages with the B4J tool?

 

[Radiomodell]

No. Messages are send by another mobile device using Sendmessage Sub shown above. That works well when App is in Forground.Did not use B4J til now.
My impression is that messages arrive even when app is in Background because Notifications were raised.

 

[Radiomodell]

I got it working. Notifications send by B4J tool my app arrived also when in background.
Now I use code from B4J sub Sendmessage with success.

@ Erel: Thanks for getting me to the trail again.

 

[wes58]

I got it working. Notifications send by B4J tool my app arrived also when in background.
Now I use code from B4J sub Sendmessage with success.

@ Erel: Thanks for getting me to the trail again.

According to Google: https://firebase.google.com/docs/cloud-messaging/concept-options

Notification messages with optional data payload​

Both programmatically or via the Firebase console, you can send notification messages that contain an optional payload of custom key-value pairs. In the Notifications composer, use the Custom data fields in Advanced options.


App behavior when receiving messages that include both notification and data payloads depends on whether the app is in the background or the foreground—essentially, whether or not it is active at the time of receipt.

• When in the background, apps receive the notification payload in the notification tray, and only handle the data payload when the user taps on the notification.
• When in the foreground, your app receives a message object with both payloads available.