Ytukyg

I'm trying to integrate Firebase FCM into my app but i'm receiving messages
multiple times.

I send the messages trough a cloud function that triggers whenever a notice is added to the database like this:

import { DataSnapshot } from "firebase-functions/lib/providers/database";

import { EventContext } from "firebase-functions";

import * as admin from 'firebase-admin'

import { ResolvePromise } from "./misc";



export function doSendNoticeFCM(snapshot: DataSnapshot, context?: EventContext) {

const uid = context.params.uid;

const noticeid = String(context.params.noticeid);



const notice = snapshot.val();



return admin.database().ref('device-tokens').child(uid).child('0')

    .on('value', (data) => {

        const token = data.val();



        if (token === null) {

            return ResolvePromise();

        }



        const title = String(notice['Title']);

        const body = String(notice['Body']);



        console.log("Title: " + title);

        console.log("Body: " + body);



        const payload: admin.messaging.Message = {

            data: {

                notice_id: noticeid,

                title: title,

                body: body

            },

            android: {

                ttl: 0

            },

            token: token

        };



        return admin.messaging().send(payload)

            .then((response) => {

                // Response is a message ID string.

                console.log('Successfully sent message:', response);

            })

            .catch((error) => {

                console.log('Error sending message:', error);

            });



    });

}

This works fine i retrieve the device token, send the message and i receive it in my app in my messaging service.

using System;

using Android.App;

using Android.Support.V4.App;

using Firebase.Messaging;

using Android.Util;

using Doshi.Xamarin.Abstractions.StaticData;

using Android.Content;

using System.Collections.Generic;

using System.Text;

using Newtonsoft.Json;

using Android;

using Xamarin.Forms;

using Plugin.CurrentActivity;

using Acr.UserDialogs;

using Doshi.Xamarin.Core.Helpers;

using Doshi.Xamarin.Abstractions.Misc;

using Doshi.Xamarin.Android.Logic.Interfaces;

using Doshi.Xamarin.Android.Logic.Implementations;



namespace Doshi.Droid

{

    [Service(Name = "com.doshi.droid.DoshiMessagingService")]

    [IntentFilter(new {"com.google.firebase.MESSAGING_EVENT"})]

    public class DoshiMessagingService : FirebaseMessagingService

    {

        INoticePresenter _noticePresenter = new DoshiNoticePresenter();



        public override void OnMessageReceived(RemoteMessage message)

        {

            HandleNotice(message);

        }



        private void HandleNotice(RemoteMessage message)

        {

            int id = DateTime.Now.Millisecond;

            //Create the hardware notice.

            _noticePresenter.PresentNotice(this, message, id, Xamarin.Droid.Resource.Drawable.ic_logo, typeof(MainActivity));

        }

    }

The problem occurs when i log out of my app and then login again the same notices i received earlier are received again. I use google authentication with firebase in my app and i remove the device token from the database when i log out and add the current token when i login again. Could this be the problem?

from what i can see in the firebase logs the cloud function is only executed once for each message so i'm guessing somethings wrong on the client side. I read on a other stackoverflow post that setting ttl to 0 would resolve this issue but it's not effecting anything what i can see.

Has anybody else run into this issue or have any idea of what i'm doing wrong?
I'm using the latest "stable" version of the Xamarin.Firebase.* nugets.

Found my issue. I should use "once" instead of "on" in my firebase function which explains why it was sent multiple times as my listener was triggered when i add/removed device tokens