AsyncTcpConnection 链接后是否成功，怎么查看数据

// 发起异步连接
$con = new AsyncTcpConnection('ws://api.huobi.pro/ws');

// 设置以ssl加密方式访问
$con->transport = 'ssl';

$con->onConnect = function(AsyncTcpConnection $con) {
    file_put_contents('./4596.txt',132);
    $con->send('hello');
};

$con->onMessage = function(AsyncTcpConnection $con, $data) {
    echo $data;
};

$con->connect();