connection check

handler.go

@@ -99,7 +99,13 @@ func (c *Client) connectAndSignal(addr string, timeout time.Duration) error {
 		if res.err != nil {
 			return res.err
 		}
-		c.connection = res.conn
+
+		c.changeConnection(res.conn)
+		if err := c.init(res.conn); err != nil {
+			res.conn.Close()
+			return fmt.Errorf("init failed: %w", err)
+		}
+
 		close(c.connected)
 		return nil
 	}