wss-server.js

 let options = {
     key: fs.readFileSync('./ssl/key.pem', "utf-8"),
     cert: fs.readFileSync('./ssl/cert.pem', "utf-8")
 };

 let httpsServer = https.createServer(options, (req, res) => {

     req.socket.end();

 });

 this.server = new WebSocketServer({
     server: httpsServer,
     perMessageDeflate: false,
     noDelay: true
 });

 this.server.on('connection', this.onconnect.bind(this));

 httpsServer.listen(ENV.wssPort);