The Service Worker is necessary to display messages when the browser or tab are not in focus . Download the JavaScript file firebase-messaging-sw. js. Create the Webapp-Project in Firebase and copy the configuration.
Read moreWhere do I put firebase messaging in SW js?
firebase-messaging-sw. js is a must and should be present in the host root directory . This is required to setup background notification handler when browser is not in focus or in background.25 Şub 2017
Read moreIs Firebase free for notification?
Send messages to any device Firebase Cloud Messaging (FCM) provides a reliable and battery-efficient connection between your server and devices that allows you to deliver and receive messages and notifications on iOS, Android, and the web at no cost .
Read moreHow can I get FCM device token?
It’s my first time using FCM. I download a sample from firebase/quickstart-android and I install the FCM Quickstart.
Read moreAre Google Cloud Messaging tokens unique?
According to documentations, they’re unique , but you can’t bind them to a specific device since they might change.
Read moreDo FCM tokens expire?
It doesn’t expire though. It renews itself if one of the following happens. According to https://firebase.google.com/docs/cloud-messaging/android/client: -The app deletes Instance ID.
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