How do you send a Firebase Notification to all devices via CURL

Question

I m attempting to send out a notification to all app users  on Android   essentially duplicating what happens when a notification is sent via the Firebase admin console  Here is the CURL command I begin with   curl --insecure --header  Authorization  key AIzaSyBidmyauthkeyisfineL-6NcJxj-1JUvEM  --header  Content-Type application json  -d     notification      title     note-Title     body     note-Body      https   fcm googleapis com fcm send  Here s that JSON parsed out to be easier on your eyes      notification         title   note-Title        body   note-Body            The response that comes back is just two characters   to  That s it  the word  to    Headers report a 400  I suspect this has to do with not having a  to  in my JSON  What would one even put for a  to   I have no topics defined  and the devices have not registered themselves for anything  Yet  they are still able to receive notifications from the Firebase admin panel   I m want to attempt a  data only  JSON package due to the amazing limitation of Firebase notification processing whereby if your app is in the foreground  the notification gets processed by YOUR handler  but if your app is in the background  it gets processed INTERNALLY by the Firebase service and never passed to your notification handler  APPARENTLY this can be worked around if you submit your notification request via the API  but ONLY if you do it with data-only   Which then breaks the ability to handle iOS and Android with the same message   Replacing  notification  with  data  in any of my JSON has no effect   Ok  then I attempted the solution here  Firebase Java Server to send push notification to all devices which seems to me to say  Ok  even though notifications to everyone is possible via the Admin console    it s not really possible via the API   The workaround is to have each client subscribe to a topic  and then push out the notification to that topic  So first the code in onCreate   FirebaseMessaging getInstance   subscribeToTopic  allDevices      then the new JSON I send      notification         title   note-Title        body   note-Body          to   allDevices      So now I m getting a real response from the server at least  JSON response      multicast id  463numbersnumbers42000   success  0   failure  1   canonical ids  0   results                    error   InvalidRegistration                  And that comes with a HTTP code 200  Ok    according to https   firebase google com docs cloud-messaging http-server-ref a 200 code with  InvalidRegistration  means a problem with the registration token  Maybe  Because that part of the documentation is for the messaging server  Is the notification server the same  Unclear  I see elsewhere that the topic might take hours before it s active  It seems like that would make it useless for creating new chat rooms  so that seems off as well   I was pretty excited when I could code up an app from scratch that got notifications in just a few hours when I had never used Firebase before  It seems like it has a long way to go before it reaches the level of  say  the Stripe com documentation    Bottom line  does anyone know what JSON to supply to send a message out to all devices running the app to mirror the Admin console functionality

User · Answer

Just make all users who log in subscribe to a specific topic  and then send a notification to that topic

User · Answer

Your can send notification to all devices using   topics all   https   fcm googleapis com fcm send Content-Type application json Authorization key AIzaSyZ-1u   0GBYzPu7Udno5aA       to     topics all      notification     title   Notification title    body   Notification body    sound   default    click action   FCM PLUGIN ACTIVITY    icon   fcm push icon        data          message    This is a Firebase Cloud Messaging Topic Message

User · Answer

Check your topic list on firebase console   Go to firebase console  Click Grow from side menu  Click Cloud Messaging  Click Send your first message  In the notification section  type something for Notification title and Notification text  Click Next  In target section click Topic  Click on Message topic textbox  then you can see your topics  I didn t created topic called android or ios  but I can see those two topics   When you send push notification add this as your condition   quot condition quot   gt   quot  all  in topics     android  in topics     ios  in topics quot     Full body array       quot notification quot   gt array           quot title quot   gt  quot Test quot            quot body quot   gt  quot Test Body quot               quot condition quot   gt   quot  all  in topics     android  in topics     ios  in topics quot       If you have more topics you can add those with     or  condition  Then all users will get your notification  Tested and worked for me

User · Answer

EDIT  It appears that this method is not supported anymore  thx to  FernandoZamperin   Please take a look at the other answers  Instead of subscribing to a topic you could instead make use of the condition key and send messages to instances  that are not in a group  Your data might look something like this         quot data quot              quot foo quot    quot bar quot              quot condition quot    quot    anytopicyoudontwanttouse  in topics  quot     See https   firebase google com docs cloud-messaging send-message send messages to topics 2

User · Answer

Firebase Notifications doesn t have an API to send messages  Luckily it is built on top of Firebase Cloud Messaging  which has precisely such an API   With Firebase Notifications and Cloud Messaging  you can send so-called downstream messages to devices in three ways    to specific devices  if you know their device IDs to groups of devices  if you know the registration IDs of the groups to topics  which are just keys that devices can subscribe to   You ll note that there is no way to send to all devices explicitly  You can build such functionality with each of these though  for example  by subscribing the app to a topic when it starts  e g   topics all  or by keeping a list of all device IDs  and then sending the message to all of those   For sending to a topic you have a syntax error in your command  Topics are identified by starting with  topics   Since you don t have that in your code  the server interprets allDevices as a device id  Since it is an invalid format for a device registration token  it raises an error   From the documentation on sending messages to topics   https   fcm googleapis com fcm send Content-Type application json Authorization key AIzaSyZ-1u   0GBYzPu7Udno5aA       to     topics foo-bar      data          message    This is a Firebase Cloud Messaging Topic Message

User · Answer

I was looking solution for my Ionic Cordova app push notification   Thanks to Syed Rafay s answer   in app component ts  const options  PushOptions       android        topics    all          in Server file   to    gt    topics all

User · Answer

For anyone wondering how to do it in cordova hybrid app   go to index js - gt  inside the function onDeviceReady   write     subscribe        It s important to write it at the top of the function    then  in the same file  index js  find   function subscribe     FirebasePlugin subscribe  quot write here your topic quot   function        function error         logError  quot Failed to subscribe to topic quot   error              and write your own topic here - gt   quot write here your topic quot

User · Answer

One way to do that is to make all your users  devices subscribe to a topic  That way when you target a message to a specific topic  all devices will get it  I think this how the Notifications section in the Firebase console does it

User · Answer

The most easiest way I came up with to send the push notification to all the devices is to subscribe them to a topic  all  and then send notification to this topic  Copy this in your main activity  FirebaseMessaging getInstance   subscribeToTopic  all      Now send the request as        to    topics all       data               title   Your title          message   Your message         image-url   your image url           This might be inefficient or non-standard way  but as I mentioned above it s the easiest  Please do post if you have any better way to send a push notification to all the devices   You can follow this tutorial if you re new to sending push notifications using Firebase Cloud Messaging Tutorial - Push Notifications using FCM    To send a message to a combination of topics  specify a condition  which is a boolean expression that specifies the target topics  For example  the following condition will send messages to devices that are subscribed to TopicA and either TopicB or TopicC         data               title    Your title          message    Your message         image-url    your image url            condition     TopicA  in topics  amp  amp    TopicB  in topics     TopicC  in topics       Read more about conditions and topics here on FCM documentation

[android] How do you send a Firebase Notification to all devices via CURL?

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