Develop Reference

How to test Google Play Real Time Notifications for Subscriptions?

I'm trying to implement in-app subscriptions in my app. So ,first I set upped the real time notifications. But the problem is that I can't test them for in-app subscriptions. Can anyone help me with this? Let me describe what I have.
I created the topic
Created the subscription in that topic
Added the endpoint in the subscription
Added topic name in the play.google.com in the Services and APIs section
Added the endpoint on my server, so I can receive the requests
When I hit the SEND TEST NOTIFICATION button, I can successfully receive the request, but the problem is that the request has no any values, as described here.
https://developer.android.com/google/play/billing/realtime_developer_notifications
According to link,
Each publish made to a Pub/Sub topic contains a single base64-encoded DeveloperNotification with the following fields:
{
"version": string,
"packageName": string
"eventTimeMillis": long
"oneTimeProductNotification": OneTimeProductNotification
"subscriptionNotification": SubscriptionNotification
"testNotification": TestNotification
}
and
A TestNotification contains the following fields:
{
"version": string
}
So my question is , how can test this Json? I mean why the request has no values ?
Thanks.

Sorry Guys.
I found the problem.
I was trying to get the fields in the wrong way. As my server technology is PHP,I was trying to get from $_POST array, but the right way is
$result = file_get_contents("php://input");

How to change Firebase topic for some users in specified time?

We have an Android education app and we use FCM Topic Messaging for sending specific notifications to each user. We categorized each user according to academic year.
Now, we have one problem for topic messaging, in the specified time, these students goes to one level higher and if we don't change the topic in Firebase for new academic year, it gives the last year notification.
How can we do this? Does Firebase have a solution for this problem? Thanks <3

This can be done through your App Server by using the InstanceID API.
You can batchAdd the corresponding tokens to the new topic (i.e. academicy year) you need, then batchRemove them from the old topic (i.e. last year).
From the link above:
Manage relationship maps for multiple app instances
Using the Instance ID service's batch methods, you can perform batch management of app instances. For example, you can perform bulk addition or removal of app instances to an FCM or GCM topic. To manage app instances, call the Instance ID service at this endpoint, providing the app instance tokens in the JSON body:
https://iid.googleapis.com/iid/v1:batchAdd
https://iid.googleapis.com/iid/v1:batchRemove
Parameters
Authorization: key=YOUR_API_KEY. Set this parameter in the header.
to : The topic name.
registration_tokens : The array of IID tokens for the app instances you want to add or remove.
Results
On success the call returns HTTP status 200. Empty results indicate successful subscription for the token. For failed subscriptions, the result contains one of these error codes:
NOT_FOUND — The registration token has been deleted or the app has been uninstalled.
INVALID_ARGUMENT — The registration token provided is not valid for the Sender ID.
INTERNAL — The backend server failed for unknown reasons. Retry the request.
TOO_MANY_TOPICS — Excessive number of topics per app instance.
Example POST request
https://iid.googleapis.com/iid/v1:batchAdd
Content-Type:application/json
Authorization:key=API_KEY
{
"to": "/topics/movies",
"registration_tokens": ["nKctODamlM4:CKrh_PC8kIb7O...", "1uoasi24:9jsjwuw...", "798aywu:cba420..."],
}
Example result
HTTP 200 OK
{
"results":[
{},
{"error":"NOT_FOUND"},
{},
]
}

How to check the delivery status of Firebase message sent to an Android application? [duplicate]

This question already has answers here:
Firebase notification records/log API
(2 answers)
Closed 4 years ago.
I am testing the Firebase JSON to check the delivery receipts of the notification sent to the news app. I can successfully send the message to the Android app without any issues and I receive the message on my Android app. However, I want to know how and where can I check if the notification was successfully delivered to the Android app?
How do I use the message_id and/or multicast_id that is given back to get the delivery status of the notification? I can't find working code examples of checking for delivery status with Firebase. Does anyone have working JSON code to query the delivery status of a Firebase message via the message_id and/or multicast_id or another way? The Firebase documentation does not give examples on how to do this (or maybe I missed the example).
Please see the Firebase JSON below used to send the notification to the Firebase news app. Anyone's help is highly appreciated.
In the header I set authorization key=firebase_server_key
and content type is set to application/json
{
"to" : "token received from firebase",
"notification" : {
"body" : "test",
"title" : "Alert",
"icon" : "myicon",
"delivery_receipt_requested": true
}
}
Output from postman:
{"multicast_id":7845213569874521,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:4853214789631%31bd1c9631bd1c96"}]}

Update:
The Diagnostics Tool has been removed since Nov. 30, 2017:
You can no longer access FCM diagnostics data in the Play Console.
Confirming what #user7410521 said in the comments section. There is currently no available API to make use of the message_ids/multicast_ids to retrieve the details of the delivery status of the message sent, other than using the FCM Diagnostics Page. Do also keep in mind that the Diagnostics page is only usable when the app is already published (for Alpha testing or later).
I noticed that you included the delivery_receipt_requested parameter in your payload. Receiving the a message confirmation should be enough to determine that the device received the message.

Though there is no API so far also I could find out. I have tried a workarond. From the server side PHP I am sending an FCM message. Let me present how I have handled this in PHP.
$fcm_return = fcm_message_send($message);
$fcm_return_JSON = json_decode($fcm_return, true);
echo $$fcm_return_JSON['success'];
As I am sending a message to one device, I am comparing return with 1. Based on this you could further implement your logic.

How to structure a notification system for a chat app using Firebase Database and Firebase Notification

I'm developing a chat application using Firebase Database in Android.
I've already done the core (chat and user's list activities), but I have yet to do the notification system.
What I want is that when a user is added to a conversation (single or group) and another user writes a new message to the conversation, the first user has to receive a notification that if clicked opens the conversation activity.
My big dilemma is how to structure the service that runs in background to receive the push notification or to listen to the firebase database node I need to look at to know if there are any messages.
I figured out two different approaches:
Approach 1) Use the firebase notification
With this approach I simply send a data notification from the sender client to all the other clients in the conversation when the sender sends a message, and so the receiver will decide to show the notification (if the chat activity it's not opened) and handle the click action.
With this approach I think I will save CPU consumption and then battery.
What I don't understand is how to register a user to receive a group notification (topic notification) because as I understood, I have to subscribe that client to the topic, but if the application is in background or close, how does it knows that a new group, with its user inside, has been created and so it has to subscribe to the topic?
For the two-users conversation scenario this is not a problem as I can send the notification directly to the destination user without needing him to be subscribed to any topic.
Approach 2) Listen to a firebase database data node with a background service
With this approach I just need to create a bootable service that listen to a specific node of the database (with ValueEventListener) and show a notification when data shows that a new message/conversation is coming.
An example of the node to listen to, can be the data about the unseen messages as following:
conversation_user_unseen_messages
$conversationId1
$user1: 3
$conversationId2
$user2: 1
Then, if the data shows new messages/conversations the android app client will decide to show a system notification.
I think that with this approach there will be more energy consumption as it has to constantly check if there are any new message on the db.
Final consideration
I have found a very useful guide written by the mythical Frank van Puffelen,that explains how to set up the system I need, with using an additional server side component (node.js server).
My last question is: do I need to set up a server? Is a better solution than handling everything by the clients (using for example http requests)?
What solution do you think is the best?
Many thanks.
EDIT
I'm still figuring it out, but here it is some consideration.
I have to requesting and using a InstanceID
Instance ID provides a unique ID per instance of your apps.
So i have to request an InstanceID when user is connected and the InstanceId it is avalaible.
And then don't use topics.
Topic messages are optimized for throughput rather than latency. For
fast, secure delivery to single devices or small groups of devices,
target messages to tokens, not topics.
as said in the topic messagin guide that instead suggests to target message to tokens .
To do so I have to collect the user token in my user database reference:
users: {
$userId1: {
name: "John",
email: "john#gmail.com",
token: "Ax8HiP3Edf7....",
}
}
and then when my app client send a new message it has to also has to send a notification for all users involved in the chat, thing that I already can do with my current db structure.
How do I handle and collect the requests?
I implement a node.js server app that connect to Firebase Database and listens for the notification requests made by the app and then sends the notification request by http call to every destination app.
When do I have to register the user token?
When a app client starts for the first time or when the InstanceID expire (onTokenRefresh).
Is this the right way to do it?
EDIT 2
I found a big hole in the FCM implementation. It seems that I can not handle at all notifications delivered to iOs apps that are not in foreground.
As found in the Data notification documentation
On iOS, FCM stores the message and delivers it only when the app is in the foreground and has established a FCM connection. On Android, a client app receives a data message in onMessageReceived() and can handle the key-value pairs accordingly.
And I need to catch the data notification even when the app is in background, I need that specifically because I want to update my badge counter on the app icon to let the user know how many unread messages he has.
I'm now tryng the OneSignal solution can receive notification even when in background, it's free and interfaces with GCM. I'm sad to not stay with Google but if I can't update the badge count using FCM I have to look to an other side.
Any consideration will be appreciated.

Approach 1 is the one that you should use. Frank's guide is using the first approach, so you need to set up a server.
Is it a better solution than handling everything by the clients (using for example http requests)?
Yes. If you send the notification in the client (the app), your API Key will be exposed (via network sniffing or reverse engineering) and you definitely would want to avoid that.
how to subscribe a user to a new group topic if the app is closed or in the background?
Looks like you have to create relation mapping on the server, by calling https://iid.googleapis.com/iid/v1/IID_TOKEN/rel/topics/TOPIC_NAME with Authorization: key=YOUR_API_KEY as the header, the full description is here. Follow this guide to get the Instance ID token.
I hope my answer answers your questions. Cheers :)

Now you can simply achieve this using firebase functions ...
Here's mine
'use strict';
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.sendFollowerNotification =
functions.database.ref('/whatever/{groupUID}/{userUID}/{todoUID}')
.onWrite(async (change, context) => {
const useruuid = context.params.userUID;
const thisdata = change.after.val();
console.log('sendto:'+useruuid);
var ref = admin.database().ref(`userdatas/${useruuid}/phonetkn`);
return ref.once("value", function(snapshot){
const payload = {
notification: {
image: "default",
sound:"default",
vibrate:"true" ,
title: 'New Mission !',
body: thisdata.titre ,
color: '#22c064',
icon: "notification_icon"
}
};
admin.messaging().sendToDevice(snapshot.val(), payload)
}, function (errorObject) {
console.log("The read failed: " + errorObject.code);
});
});
//

Clearing app data not clearing GCM token nor GCM subscribing topics

I had subscribed to topics from GCM and when I removed all app data by android settings, the GCM token is the same and GCM notification on topics are still available, so I get notifications which I don't want to receive.
My questions are:
How can I get list all of subscribed topics from GCM?
How can I remove all subscribed topics without knowing their names?
Should the GCM token be changed after clearing app data or should all subscribed topics be removed automatically in this case?

You can't only you can use tool for debug i suggest :)
You have to save subscribed topics for example in sharedprefs. If you don't have token in sharedpreferences you should call instanceId.deleteInstanceID()
Simply call instanceId.deleteInstanceID()
Token will change rarely but when it changes you must resubscribe all your topics.
Also checkout this question on SO
TOOL
You can use this tool to debug :)
When i don't subscribe any topic i get something like this:
{
"applicationVersion": "39",
"connectDate": "2016-01-12",
"application": "com.esportlivescore.develop.debug",
"authorizedEntity": "114434000000000",
"connectionType": "MOBILE",
"appSigner": ".................",
"platform": "ANDROID"
}
After i subscribe some topic:
{
"applicationVersion": "39",
"connectDate": "2016-01-12",
"application": "com.esportlivescore.develop.debug",
"authorizedEntity": "11443413691531",
"rel": {
"topics": {
"match-28388-start": {
"addDate": "2016-01-13"
}
}
},
"connectionType": "MOBILE",
"appSigner": ".................",
"platform": "ANDROID"
}
So somple usage. I use Advanced REST Client (plugin for Chrome)
HTTP GET Request
https://iid.googleapis.com/iid/info/<TOKEN>?details=true
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA
TOKEN in url : token obtainet from google
key : can be found in Google Developer Console / GCM Console

How can I get list all of subscribing topics from gcm?
The current version of GCM doesn't provide a method to do this.
How can I remove all of subcribing topics without knowing their names?
The documentation indicates InstanceId.deleteInstanceID() will do this.
Should GCM token be changed after clear app data or removed all
subscribing topics in this case automatically?
Although the documentation implies that token registrations and subscriptions are removed if the user clears app data, that is not true in the current version of GCM. The issue is discussed in the answer to this related question.