The Apple Push Notification Service has been released in the summer of 2009 in order to combat one of the major limitations of ipad and iphone regarding the fact that applications cannot keep running in the background when the user switches to another application. Therefore, APNs is a service that allows users to be constantly connected to Apple's push notification server and receive push messages for certain apps installed on their devices. Developers who want to create iphone push notifications as well as ipad push notifications for particular apps must follow certain guidelines. All the requirements regarding the communication process with APNs are incorporated in “Apple Push Notification Service Programming Guide” while the process takes place over a binary interface which is available through gateway.push.apple.com, port 2195.
In order to take advantage of ipad push notifications and iphone push notifications, you first must send a certificate request file and ask them to offer you a development SSL certificate which will be used later on. You can generate the request certificate file if you launch the Keychain application in your Mac OS X and select the Keychain Access Certificate Request from a certificate authority. The next steps are quite simple given that you just have to complete your information and push the Save to disk option after you select the suggested name. If you are interested in ipad push notifications and iphone push notifications, you should know that each and every application that uses the APNs needs an unique application ID to identify as such and thus you must also learn how to create an app ID.
You must visit developer.apple.com and choose the portal which is on the right of the page. In the ipad/iphone developer program you will find the app IDs tab where you have to push the New App ID button and fill in “PushAppID” in the section for descriptions. Once you select Generate Now for the Bundle Seed ID, Bundler identifier, net.learn2develop.MyPushApp, you have to push submit and you will see the new App ID. Using the new App ID, you are now ready to configure iphone push notifications and ipad push notifications. Furthermore, you also have to create a provisioning profile and to install it onto a mobile device. When all these steps are completed, you are ready to develop an ipad/ iphone application.
If you want to create ipad push notifications and iphone push notifications for these particular applications, you have to use the SSL certificate that you have generated, to construct the payload for the message that you want to send and then send the push notifications which contain the payload to the APNs. Once you have established the connection with the APNs, you have the possibility to send as many notifications as you want within the time frame of connection. In addition, there are several aspects that you have to consider such as the fact that the maximum size for a notification payload is 256 bytes and that you have to connect frequently to the feedback web server in order to be updated with the current list of those devices that have repeatedly reported failed-delivery attempts. This is a major responsibility when you are interested in ipad push notifications and iphone push notifications, for it allows you to constantly improve your services.
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