AsyncTcpConnection类tcp连接不上

$worker = new Worker('websocket://0.0.0.0:8998');
        $all_connections = [];
        $worker->onMessage = function($con, $data) {
            // 假设已知设备ip和端口
            $ip = '121.40.*.*'; $port = 8990;
            // 获取与设备的连接
            $device_connection = get_connection($ip, $port);

            $device_connection->onError = function($connection, $code, $msg)
            {
                echo "error $code $msg\n";
            };
            $device_connection->onConnect=function ($con){
                dump("tcp连接成功");
            };
            // 设备发来数据时
            $device_connection->onMessage = function($device_connection, $data){
                dump($data);
            };
            // 给设备发数据
            $device_connection->send('');

        };
        function get_connection($ip, $port)
        {
            static $all_connections = [];
            $addr = $ip.":".$port;
            if (isset($all_connections[$addr])) {
                return $all_connections[$addr];
            }
            $con_to_device = new AsyncTcpConnection('tcp://'.$addr);
            // 与设备的连接关闭时，1秒后重新自动连接
            $con_to_device->onClose = function($con_to_device){
                $con_to_device->reconnect(1);
            };
            $con_to_device->connect();
            $all_connections[$addr] = $con_to_device;
            return $con_to_device;
        }
        // 运行worker
        Worker::runAll();

1.网页端的websocket发送的消息指令通过AsyncTcpConnection类转发给tcp，2.tcp收到指令后返回消息通过websocket显示在网页端；

大佬帮忙看下是哪里出现问题了，连接不上tcp