Android Question [Resolved] FCM - Android to send the push messages

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Private Sub SendMessage(Topic As String, Title As String, Body As String)
    Dim Job As HttpJob
    Job.Initialize("fcm", Me)
    Dim m As Map = CreateMap("to": $"/topics/${Topic}"$)
    Dim data As Map = CreateMap("title": Title, "body": Body)
    If Topic.StartsWith("ios_") Then
        Dim iosalert As Map =  CreateMap("title": Title, "body": Body, "sound": "default")
        m.Put("notification", iosalert)
        m.Put("priority", 10)
    End If
    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=" & API_KEY)
End Sub


Sub btn_invia_Click

    'Se ho modificatola notifica faccio l'update
    If ft_notifica.Text.Length > 0   Then
        SendMessage("general", "NameApp", ft_notifica.Text)
    Else
        Msgbox("INSERIRE IL MESSAGGIO DA INVIARE","MESSAGGIO")
        ft_notifica.RequestFocusAndShowKeyboard
    End If
  
End Sub