Close connected UDP for normal UDP (to support receiving messages from multipile peers).

udp_test/udp_test.cpp

@@ -11,7 +11,7 @@
 							 //you will see them cross together on the receiver's screen.
 							 //with this macro, if heartbeat not applied, macro ST_ASIO_AVOID_AUTO_STOP_SERVICE must be defined to avoid the service_pump run out.
 #define ST_ASIO_AVOID_AUTO_STOP_SERVICE
-#define ST_ASIO_UDP_CONNECT_MODE true
+//#define ST_ASIO_UDP_CONNECT_MODE true
 //#define ST_ASIO_HEARTBEAT_INTERVAL 5 //neither udp_unpacker nor udp_unpacker2 support heartbeat message, so heartbeat will be treated as normal message.
 //#define ST_ASIO_DEFAULT_UDP_UNPACKER udp_unpacker2<>
 //configuration
@@ -65,6 +65,8 @@ int main(int argc, const char* argv[])
 
 	if (0 == index)
 	{
+		service.set_connect_mode();
+
 		//reliable_socket cannot become reliable without below statement, instead, it downgrade to normal UDP socket
 		service.create_kcpcb(0, (void*) &service);
 		//without below statement, your application will core dump