How Do iOS Push Notifications Work

How do iOS Push Notifications work?

It was too much for me to put in a comment so.

From the documentation.

Apple Push Notification service (APNs) propagates push notifications to devices having applications registered to receive those notifications. Each device establishes an accredited and encrypted IP connection with the service and receives notifications over this persistent connection. Providers connect with APNs through a persistent and secure channel while monitoring incoming data intended for their client applications. When new data for an application arrives, the provider prepares and sends a notification through the channel to APNs, which pushes the notification to the target device..

I suggest reading the documentation for more information and how to use and configure. It's all there.

Push Notifications

How Firebase push notification work on IOS?

Firebase Cloud Messaging (FCM) delivers push notification to iOS devices via Apple's Push Notifications service. Also FCM extends functionality of push notifications.
How FCM extends?

  • FCM works with iOS and Android. Cool feature if you have the app for both platforms;
  • Don't need to develop backend for sending notifications, storing pn tokens etc. Just register your app in the Google Developer Console and follow User Guides. For sending a push just execute request to https://fcm.googleapis.com/fcm/send with params;
  • Broadcast notifications. The app subscribes to a topic and then you can send a notification to all topic subscribers. Very cool;
  • Upstream messages (send data to the server)

Also Google has others services you can extend FCM with. For example Cloud Functions.

I didn't find that FCM integration take big affect to battery life in my apps.

UPDATE:
FCM framework sends push notification token (and other info) to Google services. Also as I mentioned above you can subscribe app for a specific topic. Than Google knows which device needs to send a push to.
There is a possibility to setup FCM in iOS automatically(with using method swizzling). FCM exchange AppDelegate methods and knows your's device pn token.

How to group iOS push notifications for unread messages into a single one

In iOS, Apple Push Notification service includes a Quality of Service component that performs a store-and-forward function. If APNs attempts to deliver a notification and the destination device is offline, APNs stores the notification for a limited period of time and delivers it when the device becomes available again. This component stores only the most recent notification per device and per app. If a device is offline, sending a notification request targeting that device causes the previous request to be discarded. So incase the device is offline it will always receive the latest notification.

Now if your device is online and we receive multiple notifications to the device iOS by default group the notifications by app, So incase you only require all your notifications to be grouped on app level you don`t need to do anything as it is done by OS itself. However, if you need to to group notification based on some topic iOS also has good support for custom grouping. For more info on custom grouping, you can refer to : https://developer.apple.com/videos/play/wwdc2018/711/

I read about apns-collapse-id, will it help me? Will it display the
total amount of unread messages

apns-collapse-id is used to create notifications which should be replaced with newer ones. So if the device is online and receives multiple push notifications with same apns-collapse-id, then it discard the previous notification and displays the new one in the notification center. So there will always be only one notification in the notification center with a given apns-collapse-id. So in your case you can make use of this, by setting the apns-collapse-id in the request header and always sending the updated unread message count in the notification body, so in that case there will always be only one notification in the notification center which will be replaced again and again with the newly sent count by the server. Make sure to set same apns-collapse-id for all the notification. For more info on apns-collapse-id you can refer :
https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/sending_notification_requests_to_apns/

iOS Send Push Notification to a device WITHOUT an application?

If you are not Apple this is not possible.

For all other developers, the user needs to allow you to send him notifications and for that you need to have the app installed.

Also, if he deletes the app, Apple will interpret this as you don't want to have any information from that app anymore - including notifications.

The only way is sending emails or sms ;)

How does the push notification works in the Mobile Device Management in iOS?

how device receives the push notification.If app is in back ground state and it gets a notification to connect to the server

First of all, you will have to implement server side only for iOS MDM. Client side is implemented by Apple and MDM client is baked into iOS.

As part of OS it dosn't have restriction which usual iOS apps has. It has a persistent channel to APNS and as soon as somebody send a push notification to APNS, the device will receive it through this persistent channel and will start doing what it should be doing.

Also how does the plist (that we get in command) make changes in the settings (unlock to lock) >.Do we save it somewhere in the device configuration?

The answer is the same. You don't have to implement anything on the iOS side. It's all done by Apple- MDM client will get the command, parse it, save it to appropriate places and enforce appropriate policies.

Sending Push Notifications to iOS from PWA

I just want to let you all know: Apple will support push notifications for web apps! This news was published at the WWDC2022. Apple will release Web Push with Safari 16 on macOS (Ventura) in a few months (2022) and for iOS and iPadOS in 2023.

See: https://webkit.org/blog/12945/meet-web-push/



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