Allow rediscovery of hosts after deletion without having to force quit the app

Limelight/Network/DiscoveryManager.h

@@ -21,6 +21,7 @@
 - (void) startDiscovery;
 - (void) stopDiscovery;
 - (void) stopDiscoveryBlocking;
+- (void) resetDiscoveryState;
 - (BOOL) addHostToDiscovery:(TemporaryHost*)host;
 - (void) removeHostFromDiscovery:(TemporaryHost*)host;
 - (void) discoverHost:(NSString*)hostAddress withCallback:(void (^)(TemporaryHost*, NSString*))callback;

Limelight/Network/DiscoveryManager.m

@@ -69,6 +69,11 @@
     
 }
 
+- (void) resetDiscoveryState {
+    // Allow us to rediscover hosts that were already found before
+    [_mdnsMan forgetHosts];
+}
+
 - (void) startDiscovery {
     if (shouldDiscover) {
         return;

Limelight/Network/MDNSManager.h

@@ -21,6 +21,7 @@
 - (id) initWithCallback:(id<MDNSCallback>) callback;
 - (void) searchForHosts;
 - (void) stopSearching;
+- (void) forgetHosts;
 
 @end
 

Limelight/Network/MDNSManager.m

@@ -63,6 +63,10 @@ static NSString* NV_SERVICE_TYPE = @"_nvstream._tcp";
     [mDNSBrowser stop];
 }
 
+- (void) forgetHosts {
+    [services removeAllObjects];
+}
+
 + (NSString*)sockAddrToString:(NSData*)addrData {
     char addrStr[INET6_ADDRSTRLEN];
     struct sockaddr* addr = (struct sockaddr*)[addrData bytes];

Limelight/ViewControllers/MainFrameViewController.m

@@ -829,6 +829,8 @@ static NSMutableSet* hostList;
         // This will kick off box art caching
         [self updateHosts];
         
+        // Reset state first so we can rediscover hosts that were deleted before
+        [_discMan resetDiscoveryState];
         [_discMan startDiscovery];
         
         // This will refresh the applist when a paired host is selected