Push notifications allow servers to send messages to mobile apps without the app explicitly requesting them. Notifications are sent from app servers to notification service providers like APNs or GCM, which then deliver notifications to devices even if the app is closed. Notifications are stored briefly if the device is offline and delivered once it reconnects.

1. Push Notifications
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2. What is a Push Notification
• Push notification is the delivery of
information from a software application to a
computing device, without a specific request
from the client (device).
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3. • Unlike pull notifications, in which the client
must request information from a server, push
notifications originate from a server itself.
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4. As entrepreneur Ariel Seidman writes,
“For the first time in human history, you can tap
almost two billion people on the shoulder…
Seamlessly…!!”
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6. How is notification sent??
• Step 1 : Notification is generated by the
server on which the app is running.
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7. How is notification sent??
• Step 2 : App Server notifies ‘notification
service provider’ of the specific OS.
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8. How is notification sent??
• Step 3 : Notification service provider of the
specific OS delivers the notification received
from the server to the device.
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9. How does it work??
Push Notification from 1 provider to 1 device
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10. How does it work??
Push Notification from multiple provider to multiple devices
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11. Architecture Overview
APNs – Apple Push Notification service
• Apple Push Notification service is the
centerpiece of the push notifications feature
for propagating information to iOS and OS X
devices.
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13. Architecture Overview
• APNs performs a store-and-forward function.
• If APNs attempts to deliver a notification but the
device is offline, the notification is stored for a
limited period of time, and delivered to the device
when it becomes available.
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14. Architecture Overview
• Only one recent notification for an application is stored.
If multiple notifications are sent while the device is
offline, each new notification causes the prior
notification to be discarded.
• If the device remains offline for a long time, any
notifications that were being stored for it are discarded.
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15. Architecture Overview
Device-to-Service Connection Trust
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16. Architecture Overview
Provider-to-Service Connection Trust
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17. Architecture Overview
Token Generation and Dispersal
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18. Architecture Overview
Sharing Device Token Overview
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19. Architecture Overview
Token Notification
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20. GCM
Google Cloud Messaging for Android (GCM) is a free
service that helps developers send data from
servers to their Android applications on Android
devices.
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21. Quick Question..!!
Does the app for which the notification is
being sent needs to be ON or run ACTIVELY?
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