code: func (conn *Conn) postConnect(start bool) {
  	conn.io = bufio.NewReadWriter(
  		bufio.NewReader(conn.sock),
  		bufio.NewWriter(conn.sock))
  	if start {
  		conn.wg.Add(3)
  		go conn.send()
  		go conn.recv()
  		go conn.runLoop()
  		if conn.cfg.PingFreq > 0 {
  			conn.wg.Add(1)
  			go conn.ping()
  		}
  	}
  }
docs: // postConnect performs post-connection setup, for ease of testing.