Implement silent push support, with special string sent to the register server "IC_SIL".

Only works on iOS 7.

Classes/LinphoneAppDelegate.m

@@ -60,6 +60,10 @@
 
 - (void)applicationDidEnterBackground:(UIApplication *)application{
 	[LinphoneLogger logc:LinphoneLoggerLog format:"applicationDidEnterBackground"];
+#ifdef DEBUG_PUSH
+    // simulate a lost socket when going in background
+    linphone_core_set_network_reachable([LinphoneManager getLc], FALSE);
+#endif
 	if(![LinphoneManager isLcReady]) return;
 	[[LinphoneManager instance] enterBackgroundMode];
 }
@@ -91,15 +95,19 @@
 
 - (void)applicationDidBecomeActive:(UIApplication *)application {
 	[LinphoneLogger logc:LinphoneLoggerLog format:"applicationDidBecomeActive"];
+
     [self startApplication];
     LinphoneManager* instance = [LinphoneManager instance];
 
 	[instance becomeActive];
     
-    
+#ifdef DEBUG_PUSH
+    linphone_core_set_network_reachable([LinphoneManager getLc], FALSE);
+#endif
+
     LinphoneCore* lc = [LinphoneManager getLc];
     LinphoneCall* call = linphone_core_get_current_call(lc);
-    
+
 	if (call){
 		if (call == instance->currentCallContextBeforeGoingBackground.call) {
 			const LinphoneCallParams* params = linphone_call_get_current_params(call);
@@ -121,7 +129,7 @@
 
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|UIRemoteNotificationTypeSound|UIRemoteNotificationTypeBadge];
+    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|UIRemoteNotificationTypeSound|UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeNewsstandContentAvailability];
     
 	//work around until we can access lpconfig without linphonecore
 	NSDictionary *appDefaults = [NSDictionary dictionaryWithObjectsAndKeys:
@@ -257,6 +265,25 @@
     }
 }
 
+// this method is implemented for iOS7. It is invoked when receiving a push notification for a call and it has "content-available" in the aps section.
+- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
+{
+    LinphoneManager* lm = [LinphoneManager instance];
+	[LinphoneLogger log:LinphoneLoggerLog format:@"Silent PushNotification: Receive %@", userInfo];
+
+    // save the completion handler for later execution.
+    // 2 outcomes:
+    // - if a new call/message is received, the completion handler will be called with "NEWDATA"
+    // - if nothing happens for 15 seconds, the completion handler will be called with "NODATA"
+    lm.silentPushCompletion = completionHandler;
+    [NSTimer scheduledTimerWithTimeInterval:15.0 target:lm selector:@selector(silentPushFailed:) userInfo:nil repeats:FALSE];
+
+    // Force Linphone to drop the current socket, this will trigger a refresh registers
+    linphone_core_set_network_reachable([LinphoneManager getLc], FALSE);
+    linphone_core_set_network_reachable([LinphoneManager getLc], TRUE);
+    [lm refreshRegisters];
+}
+
 
 #pragma mark - PushNotification Functions
 

Classes/LinphoneManager.h

@@ -155,7 +155,7 @@ typedef struct _LinphoneManagerSounds {
 - (BOOL)lpConfigBoolForKey:(NSString*)key;
 - (void)lpConfigSetBool:(BOOL)value forKey:(NSString*)key forSection:(NSString*)section;
 - (BOOL)lpConfigBoolForKey:(NSString*)key forSection:(NSString*)section;
-
+- (void)silentPushFailed:(NSTimer*)timer;
 
 @property (readonly) FastAddressBook* fastAddressBook;
 @property Connectivity connectivity;
@@ -172,6 +172,7 @@ typedef struct _LinphoneManagerSounds {
 @property (readonly) ALAssetsLibrary *photoLibrary;
 @property (readonly) NSString* contactSipField;
 @property (readonly,copy) NSString* contactFilter;
+@property (copy) void (^silentPushCompletion)(UIBackgroundFetchResult);
 
 @end
 

Classes/LinphoneManager.m

@@ -109,6 +109,7 @@ extern  void libmsbcg729_init();
 @synthesize bluetoothAvailable;
 @synthesize bluetoothEnabled;
 @synthesize photoLibrary;
+@synthesize silentPushCompletion;
 
 struct codec_name_pref_table{
     const char *name;
@@ -408,7 +409,16 @@ static void linphone_iphone_display_status(struct _LinphoneCore * lc, const char
         data = [[LinphoneCallAppData alloc] init];
         linphone_call_set_user_pointer(call, data);
     }
-	
+
+    if (silentPushCompletion) {
+
+        // we were woken up by a silent push. Call the completion handler with NEWDATA
+        // so that the push is notified to the user
+        NSLog(@"onCall - handler %p", silentPushCompletion);
+        silentPushCompletion(UIBackgroundFetchResultNewData);
+        silentPushCompletion = nil;
+    }
+
     const LinphoneAddress *addr = linphone_call_get_remote_address(call);
     NSString* address = nil;
     if(addr != NULL) {
@@ -587,6 +597,15 @@ static void linphone_iphone_registration_state(LinphoneCore *lc, LinphoneProxyCo
     char *fromStr = linphone_address_as_string_uri_only(linphone_chat_message_get_from(msg));
     if(fromStr == NULL)
         return;
+
+    if (silentPushCompletion) {
+
+        // we were woken up by a silent push. Call the completion handler with NEWDATA
+        // so that the push is notified to the user
+        NSLog(@"onMessageReceived - handler %p", silentPushCompletion);
+        silentPushCompletion(UIBackgroundFetchResultNewData);
+        silentPushCompletion = nil;
+    }
     
     // Save message in database
     ChatModel *chat = [[ChatModel alloc] init];
@@ -1384,7 +1403,13 @@ static void audioRouteChangeListenerCallback (
 #else
 #define APPMODE_SUFFIX @"prod"
 #endif
-		NSString *params = [NSString stringWithFormat:@"app-id=%@.%@;pn-type=apple;pn-tok=%@;pn-msg-str=IM_MSG;pn-call-str=IC_MSG;pn-call-snd=ring.caf;pn-msg-snd=msg.caf", [[NSBundle mainBundle] bundleIdentifier],APPMODE_SUFFIX,tokenString];
+        NSString *params;
+        if( [[[UIDevice currentDevice] systemVersion] doubleValue] >= 7 ){ /// use silent push for ios7 devices
+            params = [NSString stringWithFormat:@"app-id=%@.%@;pn-type=apple;pn-tok=%@;pn-msg-str=IC_SIL;pn-call-str=IC_SIL;pn-call-snd=empty;pn-msg-snd=msg.caf", [[NSBundle mainBundle] bundleIdentifier],APPMODE_SUFFIX,tokenString];
+        } else {
+            params = [NSString stringWithFormat:@"app-id=%@.%@;pn-type=apple;pn-tok=%@;pn-msg-str=IM_MSG;pn-call-str=IC_MSG;pn-call-snd=ring.caf;pn-msg-snd=msg.caf", [[NSBundle mainBundle] bundleIdentifier],APPMODE_SUFFIX,tokenString];
+        }
+
 		linphone_proxy_config_set_contact_uri_parameters(proxyCfg, [params UTF8String]);
         linphone_proxy_config_set_contact_parameters(proxyCfg, NULL);
 	}
@@ -1492,6 +1517,14 @@ static void audioRouteChangeListenerCallback (
 - (BOOL)lpConfigBoolForKey:(NSString*)key forSection:(NSString *)section {
 	return [self lpConfigIntForKey:key forSection:section] == 1;
 }
+- (void)silentPushFailed:(NSTimer*)timer
+{
+    NSLog(@"silentPush failed, silentPushCompletion block: %p", silentPushCompletion);
+    if( silentPushCompletion ){
+        silentPushCompletion(UIBackgroundFetchResultNoData);
+        silentPushCompletion = nil;
+    }
+}
 
 #pragma GSM management
 -(void) removeCTCallCenterCb {