ports.forEach(item => {
        promises.push(
            new Promise(resolve => {
                const { port, serverRef } = item;
                if (serverRef && serverRef.close) {
                    serverRef.once('close', () => {
                        setTimeout(() => {
                            console.log(`@@@ server on port ${port} stoped @@@`);
                            item.used = false;
                            item.playerId = null;
                            item.killPending = false;
                        }, 5000);
                        resolve('server stoped');
                    });
                }
                item.killPending = true;
            })
        );
    });