Question

I’m trying to implement this(Configuring Sockets for VoIP Usage) using this(CocoaAsyncSocket). To the best of my knowledge step 1 I have done, adding VOIP to background services in the plist, and below should be step 2 (Configure one of the app’s sockets for VoIP usage)

- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)connectedPort
{
    [CCV setLocalMode:FALSE];

    [socket performBlock:^{
                 [socket enableBackgroundingOnSocket];
             }];

But the rest of the steps I cannot figure out.
If I do

- (void)applicationDidEnterBackground:(UIApplication *)application
{
     expirationHandler = ^{

          [app endBackgroundTask:bgTask];
          bgTask = UIBackgroundTaskInvalid;


          bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];
     };

     bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];


     // Start the long-running task and return immediately.
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

          while (1) {
               sleep(1);               
               //NSLog(@"BGTime left: %f", [UIApplication sharedApplication].backgroundTimeRemaining);

               if ([rootViewController isIncomingCall] && showedCall != TRUE) {
                    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
                    if (localNotif) {
                         localNotif.alertBody = [NSString stringWithFormat:@"Incoming Call."];
                         localNotif.alertAction = NSLocalizedString(@"Accept Call", nil);
                         localNotif.soundName = @"alarmsound.caf";
                         //                         localNotif.applicationIconBadgeNumber = 1;
                         [application presentLocalNotificationNow:localNotif];
                         [localNotif release];
                    }
                    showedCall = TRUE;
               }
          }  
     });      

}

My client will listen for 10mins then stop. I need to do 2 things: watch for a specific (incoming call) data packet, and send a keepalive every 5seconds. But I dont see where these things are to be configured at. Furthermore the definition on the apple link above states “To prevent the loss of its connection, a VoIP app typically needs to wake up periodically and check in with its server. To facilitate this behavior, iOS lets you install a special handler using the setKeepAliveTimeout:handler: method of UIApplication“ From my understanding of that this timeout thing should only be doing the keepalive, however that doesnt make sense because the minimal time is 600seconds? And like I said above I cannot find where I tell it what packet to look for as well as what to do when its found.

Answer 1

so i believe i have resolved the issue but need further testing to be 100% sure. Currently i ran a test with this code for the length of 21mins of suspended time and it worked

step 2:

 [socket performBlock:^{
                 [socket enableBackgroundingOnSocket];
             }];

step 3:

- (void)applicationDidEnterBackground:(UIApplication *)application {

     inProgram = FALSE;
     showedCall = FALSE;

     BOOL backgroundAccepted = [[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^{ [self backgroundHandler]; }];
     if (backgroundAccepted)
     {
          NSLog(@"VOIP backgrounding accepted");
     }

}

this seems to keep my client running so from here i add an observer to wait for my incoming call packet and launch a notification when that packet is seen

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{  
     if ([keyPath isEqualToString:@"currentDigitalJoin"]) 
     {
          switch ([[cClient currentDigitalJoin]intValue]) 
          {  
               case 1000: 
               {   
                    if (showedCall != TRUE && inProgram != TRUE) {
                         NSLog(@"incoming audio call");
                         UILocalNotification *localNotif = [[UILocalNotification alloc] init];
                         if (localNotif) {
                              localNotif.alertBody = [NSString stringWithFormat:@"Incoming Call."];
                              localNotif.alertAction = NSLocalizedString(@"Accept Call", nil);
                              localNotif.soundName = @"alarmsound.caf";
                              [app presentLocalNotificationNow:localNotif];
                              [localNotif release];
                              showedCall = TRUE;
                         }
                    }
                    break;
               }
               case 602: 
               {   
                    if (showedCall != TRUE && inProgram != TRUE) {
                         NSLog(@"incoming audio call");
                         UILocalNotification *localNotif = [[UILocalNotification alloc] init];
                         if (localNotif) {
                              localNotif.alertBody = [NSString stringWithFormat:@"Incoming Call."];
                              localNotif.alertAction = NSLocalizedString(@"Accept Call", nil);
                              localNotif.soundName = @"alarmsound.caf";
                              [app presentLocalNotificationNow:localNotif];
                              [localNotif release];
                              showedCall = TRUE;
                         }
                    }
                    break;
               }
               case 513: 
               {   
                    showedCall = FALSE;
                    break;
               }
          }
     }else if([keyPath isEqualToString:@"currentDigitalJoin"])
     {
          switch ([[cClient currentDigitalJoin]intValue]) 
          { 
               case 602: 
               {   
                    showedCall = FALSE;
                    break;

               }               
          }
     }
}

NOTE: the “step”s indicated are in reference to the steps indicated on the apple documentation

also dont forget to set the require wireless in the plist file