How To Send A Notification To All Users (Topics) - andrehtissot/cordova-plugin-firebase-extended-notification-app-example GitHub Wiki

By defined in the required plugin cordova-plugin-fcm-with-dependecy-updated:

• All android users will receive messages from topic android;
• All ios users will receive messages from topic ios;
• All users will receive messages from topic all;

What you need to do is change the value of the to parameter to /topics/all.

To know more about topics, look here.

To subscribe for another topic, call FCMPlugin.subscribeToTopic('topicExample'); in the app.