Don't dislike my Questions, explain how other apps are doing or how I can achieve this.
I want to know how WhatsApp and Instagram similar apps received notifications when the app is closed or killed. Even if I restart my device and enable Wi-Fi it automatically start showing new notification in real-time.
I don't want FCM (Firebase Push Notification) because I am creating a chat app in Flutter (android/ios) that needs instant push notification for a real-time chat even app is killed or the device restarted. And neither background service because if I restart my device background service will stop running.
I want solutions like WhatsApp, Snapchat, and Instagram for real-time chat push notifications for a chat in a flutter
.