FCM Node.js topic notification doesn't reach Android app

[Whai Nooa]

I'm using a Node.js server to send topic notifications to Android devices using FCM. I tested the topic notifications from Firebase console and it did work, so the problem seems to be on the server side.

Here is my implementation:

**firebase/fb.js**

    const admin = require("firebase-admin");

    //Firestore Connect

    const DATABASE_NAME = "....";

    var serviceAccount = require('../config/.....json');

    

    module.exports = admin.initializeApp({

        credential: admin.credential.cert(serviceAccount),

        databaseURL: `https://${DATABASE_NAME}.firebaseio.com`

    });

**notifications.js**

    const router = express.Router();

    const fb = require('../firebase/fb');

    

    const db = fb.firestore();

    const fcm = fb.messaging();

    router.post('/send/topic/:topic', (req, res) => {

    

        var topic = `/topics/${req.params.topic.toString()}`;

    

        var currentTime = new Date().getTime();

    

        var payload = {

            notification: {

                title: req.body.title,

                body: req.body.body

            }

        };

    

        var options = {

            priority: "high",

            timeToLive: 60 * 60 * 24

        };

        

        fcm.sendToTopic(topic, payload, options)

            .then((response) => {

                

                res.send(200, req.body);

                // Response is a message ID string.

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

            })

            .catch((error) => {

                

                res.send(400, error);

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

            });

    });

When I execute this code I get the following response:

    Successfully sent message: { messageId: 7218165350026662000 }

The notification is not displayed on the Android phone. The device is registered to the specific topic.

I have also tried to use the `.send(message)` method but the result was the same. Moreover, I'm using quite the same algorithm to send to a specific device and that works.

What's wrong with my code?

[Kato Richardson]

Hi Whai,

Nothing springs to mind looking at that code. As a general rule, if the FCM service send a 200 response, then it was sent to the device and left Google's servers successfully. What happens from there is a tricky business and there are a host of reasons a specific device may fail--mostly related to device state and carrier issues.

Check out understanding message delivery and our troubleshooter.

☼, Kato

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