Create a google API project. Enable push notifications for the project and get a API key. Get a registration ID through android app (each device has a registration ID for a specific application) Create a server application to send your push messages as push notifications through google servers by GSM.
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How to send a message from the FireBase console?
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Using Firebase tools, you can send individual push notifications without needing a dedicated server, or a third-party service. … Firebase already has great tutorials on how to set FCM up on Android, iOS, and Web.16 Kas 2020
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Steps to be followed:
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Push notifications for FCM
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Send Device-to-Device Push Notification using Firebase Cloud Messaging
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Send Push Notifications to your Android app
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