add debug log in writePongMsg.

internal/msggateway/client.go

@@ -107,7 +107,6 @@ func (c *Client) pingHandler(appData string) error {
 	}
 
 	log.ZDebug(c.ctx, "ping Handler Success.", "appData", appData)
-
 	return c.writePongMsg(appData)
 }
 
@@ -392,17 +391,24 @@ func (c *Client) writePingMsg() error {
 }
 
 func (c *Client) writePongMsg(appData string) error {
+	log.ZDebug(c.ctx, "write Pong Msg in Server", "appData", appData)
 	if c.closed.Load() {
 		return nil
 	}
 
+	log.ZDebug(c.ctx, "write Pong Msg in Server", "appData", appData)
 	c.w.Lock()
 	defer c.w.Unlock()
 
+	log.ZDebug(c.ctx, "write Pong Msg in Server", "appData", appData)
 	err := c.conn.SetWriteDeadline(writeWait)
 	if err != nil {
-		return err
+		return errs.Wrap(err)
+	}
+	err = c.conn.WriteMessage(PongMessage, []byte(appData))
+	if err != nil {
+		log.ZError(c.ctx, "Write Message is error", errs.Wrap(err), "Pong msg", PongMessage)
 	}
 
-	return c.conn.WriteMessage(PongMessage, []byte(appData))
+	return errs.Wrap(err)
 }