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POHow to Maintain VOIP socket connection in background?
 

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  1. POHow to Maintain VOIP socket connection in background?
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    <p><strong>My App Requirement</strong>: I should maintain a socket connection to trigger local notification on server push without using Push Notification(APNs) for some reasons. So I am using the VOIP background capability of iPhone to maintain socket connection.</p> <p><strong>1. I have configured a stream for VOIP in order to persist socket connection to run in background, so what Timeout value should I set? Will the socket connection terminates once the timeout expires? How do I make my application to listen to the socket all the time.?</strong></p> <p>Client stream configuration is as follows,</p> <pre><code>NSString *urlStr = @"http://192.168.0.108"; NSURL *website = [NSURL URLWithString:urlStr]; CFReadStreamRef readStream; CFWriteStreamRef writeStream; CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)[website host], 1234, &amp;readStream, &amp;writeStream); CFReadStreamSetProperty(readStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); CFWriteStreamSetProperty(writeStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); NSInputStream *inputStream = (NSInputStream *)readStream; NSOutputStream *outputStream = (NSOutputStream *)writeStream; [inputStream setDelegate:self]; [inputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType] ; [outputStream setDelegate:self]; [outputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType] ; [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [inputStream open]; [outputStream open]; </code></pre> <p><strong>2. Should I reconnect the stream in the handler applicationDidEnterBackground:</strong></p> <pre><code> [[UIApplication sharedApplication] setKeepAliveTimeout:86400 handler:^(void) { if (inputStream) [inputStream close]; if (outputStream) [outputStream close]; urlStr = @"http://192.168.0.108"; website = [NSURL URLWithString:urlStr]; CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)[website host], 1234, &amp;readStream, &amp;writeStream); CFReadStreamSetProperty(readStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); CFWriteStreamSetProperty(writeStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); inputStream = (NSInputStream *)readStream; outputStream = (NSOutputStream *)writeStream; [inputStream setDelegate:self]; [inputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType] ; [outputStream setDelegate:self]; [outputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType] ; [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [inputStream open]; [outputStream open]; }]; </code></pre> <p><strong>3. Say my server restarts and the app is in background, how do I ensure the connection?</strong> If the Wi-Fi connection in my iPhone or if I terminate the server app the connection will be closed, so what measures should I take to make my app work as per expectation?</p>
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