Flutter : Unable to send Firebase push notifications

Question

I am trying to send firebase push notifications via Flutter. Below is the code

Future<Map<String, dynamic>> sendAndRetrieveMessage(String fcmToken, String title, String msg) async {

    await _firebaseMessaging.requestNotificationPermissions(
      const IosNotificationSettings(
          sound: true, badge: true, alert: true, provisional: false),
    );

    await http.post(
      'https://fcm.googleapis.com/fcm/send',
      headers: <String, String>{
        'Content-Type': 'application/json',
        'Authorization': 'key=$serverToken',
      },
      body: convert.jsonEncode(
        <String, dynamic>{
          'notification': <String, dynamic>{'body': msg, 'title': title},
          'priority': 'high',
          'data': <String, dynamic>{
            'click_action': 'FLUTTER_NOTIFICATION_CLICK',
            'id': '1',
            'status': 'done'
          },
          'to': fcmToken,
        },
      ),
    ).then((http.Response response){
      final int statusCode = response.statusCode;

        print("RESPONSE: " + response.body);
        print("STATUS CODE: " + statusCode.toString());

        if (statusCode < 200 || statusCode > 400 || response.body == null) {
          throw new Exception("Error while fetching data");
        }
    });
  }

Below is the error I get

RESPONSE: {"multicast_id":8498089791993785359,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"NotRegistered"}]}

Surprisingly, I can use the same FCM Token via the Firebase UI console to send messages. It simply works.

Update

for the to field, If I use the code await _firebaseMessaging.getToken() I dont get the error and it get passed.The above is for getting the FCM of the same user, which is a string.

I know my fcm token of other users are not incorrect, because when used in Firebase console, it works.

What is the issue here?

this is not using flutter but it may be the same issue for you please have a look https://stackoverflow.com/q/42241432/9142279 — HII, Apr 22 '20 at 18:06
@LoVe: I dont think that is the issue. I am using the server key — PeakGen, Apr 22 '20 at 18:08
ok sorry for too many redirections but did you check this also?it may contain steps that can solve your problem as they are getting your same error https://github.com/flutter/flutter/issues/30486 — HII, Apr 22 '20 at 18:13

score 0 · Answer 1 · answered Apr 24 '20 at 15:23

The error was a simple mistake, I figured it out. In the notification receiving application, I was registering my self with FCM at the register page as well as in the login page. I only save the token generated in the registration, so I simply don't have the new token generated a the login page.

Solution is to eliminate the FCM registration code in login page.

Flutter : Unable to send Firebase push notifications

1 Answers1