Push Notification

Remote notifications are handled by a remote server. Under this scenario, the client application needs to be registered on the server with a unique key (e.g., a UUID). The server then fires the message against the unique key to deliver the message to the client application via an agreed client/server protocol such as HTTP or XMPP and the client displays the message received. When the push notification arrives, it can transmit short notifications and messages, set badges on application icons, blink or continuously light up the notification LED, or play alert sounds to attract user's attention. Push notifications are usually used by applications to bring information to users' attention