Force resolution of soft AP UDP address to IPv4 (#2)

On devices with a cellular connection both the local network connection check and connections to the Soft AP seem to resolve to the cellular interface. Added hard-coding to skip DNS resolution.

Source/GCD/GCDAsyncUdpSocket.m

@@ -1188,7 +1188,23 @@ - (void)asyncResolveHost:(NSString *)aHost
 		NSMutableArray *addresses = [NSMutableArray arrayWithCapacity:2];
 		NSError *error = nil;
 
-		if ([host isEqualToString:@"localhost"] || [host isEqualToString:@"loopback"])
+        if ([host hasPrefix:@"172.16.0."])
+        {
+            struct sockaddr_in sockaddr4;
+            sockaddr4.sin_len         = sizeof(struct sockaddr_in);
+            sockaddr4.sin_family      = AF_INET;
+            sockaddr4.sin_port        = htons(port);
+            // Grab last octet from IP and convert to int
+            unsigned int lastByte = [host componentsSeparatedByString:@"."].lastObject.intValue;
+            // 172.16.0.x
+            unsigned int address = 0xAC100000 | lastByte;
+
+            sockaddr4.sin_addr.s_addr = htonl(address);
+            memset(&(sockaddr4.sin_zero), 0, sizeof(sockaddr4.sin_zero));
+
+            [addresses addObject:[NSData dataWithBytes:&sockaddr4 length:sizeof(sockaddr4)]];
+        }
+        else if ([host isEqualToString:@"localhost"] || [host isEqualToString:@"loopback"])
 		{
 			// Use LOOPBACK address
 			struct sockaddr_in sockaddr4;