barcode maker vb.net 10: Demystiying Apple s Push Notification Service in Objective-C

Draw QR in Objective-C 10: Demystiying Apple s Push Notification Service

CHAPTER 10: Demystiying Apple s Push Notification Service
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Now that you have the basics handled, let s make sure to also touch on a couple more important points about using APNS.
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Feedback Server
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Even with everything that s already in place, there s still one last step to finish to be able to say that everything is complete. The feedback server is an Apple-provided facility for determining whether there are any devices that have dropped from your service, usually because of uninstalling your app. Apple requests that you periodically check the feedback server, get the device tokens of these dropped users that it provides you, and then discontinue sending to those tokens. Jake Olefsky (http://www.toodledo.com) has posted a prototype feedback server script in PHP and with his permission I m including it here. You can find the original at https://devforums.apple.com/message/92559#92559. Here s how you do it:
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< php function iPhoneGetUninstalledTokens() { global $certPassphrase; $ctx = stream_context_create(); stream_context_set_option($ctx, 'ssl', 'local_cert', '/path/to/production.pem'); stream_context_set_option($ctx, 'ssl', 'passphrase', $certPassphrase); $fp = stream_socket_client('ssl://feedback.push.apple.com:2196', $err, $errstr, 60, STREAM_CLIENT_CONNECT, $ctx); //for sandbox: feedback.sandbox.push.apple.com:2196 if(!$fp) { echo "Failed to connect $err $errstr\n"; } else { $contents = stream_get_contents($fp); if($contents){ echo "Feedback Received"; }else{ echo "Failed to receive Feedback"; } } fclose($fp); return $contents; } $data = iPhoneGetUninstalledTokens(); $tuples = strlen($data)/38;
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CHAPTER 10: Demystiying Apple s Push Notification Service
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for($i=0;$i<$tuples;$i++) { $offset = $i*38; $time = substr($data,$offset,4); $time = hexdec(bin2hex($time)); //unix timestamp $len = substr($data,$offset+4,2); $len = hexdec(bin2hex($len)); //always 32 $token = substr($data,$offset+6,32); $token = bin2hex($token); //hex token echo $time." ".$len." ".$token; //put your removal code here //$q = "DELETE FROM apresschapter.apressdevices WHERE device_token = '$token'"; // Execute MySQL Query and test result } >
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It s important to check the Feedback service regularly to update your database of invalid device tokens.
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Try to leave your connections open! Don t be opening/closing your socket to Apple frequently. You want to send as many notifications through on each connection as you can. If you get disconnected, simply reconnect and keep sending. Do not open a new connection for each notification, since the connection setup is a comparatively expensive operation and Apple may interpret your repeated connections as a type of denial-of-service attack.
Moving from Development Sandbox to Production
When you re ready to switch from development to distribution (either for ad hoc testing or for final App Store deployment), you ll repeat the same process of creating the certificate as you did in Step 2: Create the Certificate of this chapter, only this time, you ll create a distribution version of the SSL certificate instead of a development version. After generating the Production Push certificate and provisioning file, the other key change you need to make is to switch from using the sandbox server to the production server at gateway.push.apple.com on the same port (2195). You'll need to keep track of your development and production certificates to make sure you're using the right version for deployment. You also need to make sure that you're not mixing device tokens from development with those for production. You'll use the production service for both Ad Hoc and App Store (or Enterprise) deployments.
CHAPTER 10: Demystiying Apple s Push Notification Service
Development vs. Ad Hoc
If you make the switch from development to distribution (ad hoc), and then your app immediately crashes when you launch it, you may need to restore your phone from scratch so that it can get into distribution mode. The easiest solution for this problem is to have multiple devices and keep them separated by mode (development or distribution); your second device can be an iPod Touch or a WiFi-only previousgeneration phone that you kept after an upgrade. See the note in the Back to the Portal section earlier in this chapter for more information on this issue.
Mobile Provisioning Files
If you don t get notifications, try deleting your app, deleting the mobileprovision file from the device, and then reinstalling from Xcode. To delete your mobileprovision file, go to the Settings.app and then General Profiles. If you get the following error:
2009-07-27 00:25:34.089 2Push2[98:207] didFailToRegisterForRemoteNotificationsWithError:Error Domain=NSCocoaErrorDomain Code=3000 UserInfo=0x12e3f0 "no valid 'aps-environment' entitlement string found for application"
it probably means you don t have the correct mobileprovision file selected for development. Instead of one for an existing device, you should be using the new one created with the APNS app ID. It s likely you ll switch between development and distribution modes during your development phase, and this can be tricky. Remember to make sure that the version of the iPhone application you are using (development or distribution) matches your remote SSL certificate and your tokens.
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