linux下异步tcp返回无数据（已解决）

$REAL_HSM_ADDRESS = 'tcp://127.0.0.1:6666';

// 监听本地6000端口
$hsm = new Worker('tcp://0.0.0.0:6000');

$hsm->count = 1;

$hsm->onConnect = function($connection)
{
    global $REAL_HSM_ADDRESS;

    $connection_to_hsm = new AsyncTcpConnection($REAL_HSM_ADDRESS);

    $connection_to_hsm->onMessage = function($connection_to_hsm, $buffer)use($connection)
    {

        $connection->send($buffer);
    };

// 执行异步连接
    $connection_to_hsm->connect();

    // 客户端发来数据时，转发给对应的连接
    $connection->onMessage = function($connection, $buffer)use($connection_to_hsm)
    {

        $connection_to_hsm->send($buffer);
    };