test: for pressure test.

Signed-off-by: Gordon <46924906+FGadvancer@users.noreply.github.com>

internal/msggateway/client.go

@@ -109,6 +109,10 @@ func (c *Client) ResetClient(
 
 func (c *Client) pingHandler(_ string) error {
 	c.conn.SetReadDeadline(pongWait)
+	err := c.writePongMsg()
+	if err != nil {
+		return err
+	}
 	return nil
 }