flutter + firebase adminsdk c# simple messaging

[Issam Boughanmi]

Hi,
i have some troubles to get a simple push notification on a flutter mobile application using the firebase C# admin sdk :
my c# code look like :

private async Task SendPushNotification3Async(string val)



{

    FirebaseApp.Create(new AppOptions()

    {

        Credential = GoogleCredential.FromFile(@"e:\firebase-adminsdk.json"),

    });

    var condition = "'SQL' in topics";

    var message = new FirebaseAdmin.Messaging.Message()

    {




        Notification = new FirebaseAdmin.Messaging.Notification()

        {

            Title = "simple title",

            Body = "simple message",

        },

        Condition = condition

    };







    var response = await FirebaseMessaging.DefaultInstance.SendAsync(message);




}



and on the flutter side :


import 'package:flutter/material.dart';



import 'package:sqlnotifapp/widget/messaging_widget.dart';







void main() => runApp(MyApp());




class MyApp extends StatelessWidget {

  final String appTitle = 'Simple Notifications';

  @override

  Widget build(BuildContext context) => MaterialApp(

        title: appTitle,

        home: MainPage(appTitle: appTitle),

      );

}




class MainPage extends StatelessWidget {

  final String appTitle;




  const MainPage({this.appTitle});




  @override

  Widget build(BuildContext context) => Scaffold(

        appBar: AppBar(

          title: Text(appTitle),

        ),

        body: MessagingWidget(),

      );

}


the messaging widget :

import 'package:firebase_messaging/firebase_messaging.dart';



import 'package:flutter/material.dart';

import 'package:sqlnotifapp/model/message.dart';







class MessagingWidget extends StatefulWidget {

  @override

  _MessagingWidgetState createState() => _MessagingWidgetState();

}




class _MessagingWidgetState extends State<MessagingWidget> {

   final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();










  final List<Message> messages = [];




  @override

  void initState() {

    super.initState();

    _firebaseMessaging.configure(




      onMessage: (Map<String, dynamic> message) async {

        print("onMessage: $message");

        final notification = message['notification'];

        setState(() {

          messages.add(Message(

              title: notification['title'], body: notification['body']));

        });

      },




      onLaunch: (Map<String, dynamic> message) async {

        print("onLaunch: $message");

_firebaseMessaging.subscribeToTopic('SQL');

        final notification = message['data'];

        setState(() {

          messages.add(Message(

            title: '${notification['title']}',

            body: '${notification['body']}',

          ));

        });

      },

      onResume: (Map<String, dynamic> message) async {

        print("onResume: $message");

      },

    );

    _firebaseMessaging.requestNotificationPermissions(

        const IosNotificationSettings(sound: true, badge: true, alert: true));

  }







  @override

  Widget build(BuildContext context) => ListView(

        children: messages.map(buildMessage).toList(),

      );




  Widget buildMessage(Message message) => ListTile(

        title: Text(message.title),

        subtitle: Text(message.body),

      );



}



please not the line

_firebaseMessaging.subscribeToTopic('SQL'); 

 when running this code there is no exception but there is also no push notifications :/

 please note that i can get the push notifications from the firebase console to the mobile device without a problem .but not from the .net api .

 what i am missing here ? 

is there a way to send a message through the api to an android application using it's application ID, a topic or anything ?

any help or idea is welcome , 

thanks .