diff --git a/util/websocket_utils.go b/util/websocket_utils.go
index 5e87dac..d8d78da 100644
--- a/util/websocket_utils.go
+++ b/util/websocket_utils.go
@@ -10,9 +10,13 @@ import (
 	"github.com/gorilla/websocket"
 )
 
+const (
+	pongWait = 15 * time.Second
+)
+
 type WebSocketEventHub struct {
 	Connections map[string]*websocket.Conn
-	receiveMap  map[string]bool
+	listenTag   sync.Map
 	funcMap     sync.Map
 }
 
@@ -30,7 +34,6 @@ type EventReceives struct {
 func NewWebSocketEvent() *WebSocketEventHub {
 	return &WebSocketEventHub{
 		Connections: make(map[string]*websocket.Conn),
-		receiveMap:  make(map[string]bool),
 	}
 }
 
@@ -41,18 +44,28 @@ func NewEventReceives() *EventReceives {
 	}
 }
 
+func createConnection(uri string, headers http.Header) *websocket.Conn {
+	conn, _, err := websocket.DefaultDialer.Dial(uri, headers)
+	if err != nil {
+		log.Fatal("dial:", err)
+		return nil
+	}
+	// conn.SetReadDeadline(time.Now().Add(pongWait))
+	conn.SetPongHandler(func(appData string) error {
+		conn.SetReadDeadline(time.Now().Add(pongWait))
+		return nil
+	})
+	return conn
+}
+
 func (eventHub *WebSocketEventHub) CreateManagement(eventCode string, websocketHost string, token string) bool {
 	if eventHub.Connections[eventCode] == nil {
 		var socketUri = fmt.Sprintf("%s/events/v1/management/sub?code=%s", websocketHost, eventCode)
 		// fmt.Println(socketUri)
-		conn, _, err := websocket.DefaultDialer.Dial(
-			socketUri,
-			http.Header{
-				"Authorization": []string{token},
-			},
-		)
-		if err != nil {
-			log.Printf("dail: %s", err.Error())
+		conn := createConnection(socketUri, http.Header{
+			"Authorization": []string{token},
+		})
+		if conn == nil {
 			return false
 		}
 		eventHub.Connections[eventCode] = conn
@@ -64,12 +77,8 @@ func (eventHub *WebSocketEventHub) CreateAuthentication(eventCode string, websoc
 	if eventHub.Connections[eventCode] == nil {
 		var socketUri = fmt.Sprintf("%s/events/v1/authentication/sub?code=%s&token=%s", websocketHost, eventCode, token)
 		// fmt.Println(socketUri)
-		conn, _, err := websocket.DefaultDialer.Dial(
-			socketUri,
-			http.Header{},
-		)
-		if err != nil {
-			log.Printf("dail: %s", err.Error())
+		conn := createConnection(socketUri, http.Header{})
+		if conn == nil {
 			return false
 		}
 		eventHub.Connections[eventCode] = conn
@@ -89,27 +98,50 @@ func (eventHub *WebSocketEventHub) AddReceiver(eventCode string, onSuccess func(
 	eventHub.funcMap.Store(eventCode, receivers)
 }
 
+func connPong(conn *websocket.Conn) {
+	ticker := time.NewTicker(pongWait)
+	defer ticker.Stop()
+	for range ticker.C {
+		err := conn.WriteMessage(websocket.PongMessage, nil)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}
+
 func (eventHub *WebSocketEventHub) StartReceive(eventCode string) {
-	started, ok := eventHub.receiveMap[eventCode]
-	if ok && started {
+	started, loaded := eventHub.listenTag.LoadOrStore(eventCode, true)
+	if loaded && started.(bool) {
 		return
 	}
-	eventHub.receiveMap[eventCode] = true
+	log.Println("start connection receive")
+
+	conn := eventHub.Connections[eventCode]
+	defer conn.Close()
+	go connPong(conn)
+	ticker := time.NewTicker(pongWait)
+	defer ticker.Stop()
+	begin_time := time.Now()
+	count := 0
 	for {
-		_, message, err := eventHub.Connections[eventCode].ReadMessage()
-		if funcMap, ok := eventHub.funcMap.Load(eventCode); ok {
-			funcs := funcMap.(*EventReceives)
-			if err != nil {
-				for _, onError := range funcs.Errors {
-					onError(err)
-				}
-			} else {
-				for _, onSuccess := range funcs.Successes {
-					onSuccess(message)
+		select {
+		case <-ticker.C:
+			log.Printf("received %v messages, has been running for %v seconds", count, time.Since(begin_time).Seconds())
+		default:
+			_, message, err := conn.ReadMessage()
+			if funcMap, ok := eventHub.funcMap.Load(eventCode); ok {
+				funcs := funcMap.(*EventReceives)
+				if err != nil {
+					for _, onError := range funcs.Errors {
+						onError(err)
+					}
+				} else {
+					for _, onSuccess := range funcs.Successes {
+						onSuccess(message)
+					}
 				}
 			}
+			count += 1
 		}
-
-		time.Sleep(time.Microsecond * 500)
 	}
 }