Flutter Push notification to iOS & Android without firebase?

  android, flutter, ios, notifications, push-notification

I wonder how to push notifications to my Flutter app users in both Android and iOS devices Without using any external service like Firebase or OneSignal?

I want to implement a code in PHP which can send push real time notifications to all/spesific users in my Flutter app which works in both Android and iOS.

I found some solutions like flutter_local_notifications with workmanger which can fetch the API in the background only minimum 15 minuts. Workmanger is Not good solution because its work only during 15 min and it will consume the battery and internet.

I need an efficient solution to my flutter app for both Android & iOS devices, which can listen on real time to the coming messages from the server even when the app is closed.

How to fix that? thanks

Source: Android Questions