Websocket security

I try so:

SPI3.setup({ mosi:B5, miso:C11, sck:C10 });
var eth = require("WIZnet").connect(SPI3, D0);
eth.setIP({ip : "192.168.1.13",subnet : "255.255.255.0",gateway:"192.168.1.1",dns:"192.168.1.1"});

var WebSocket = require("ws");
const ws = new WebSocket('echo.websocket.org', {
    port: 80
});

ws.on('open', function() {
    console.log('opened');
    ws.send("hello world");
});
ws.on('message', function(message) {
    console.log('received: ', message);
});

how to use WSS correctly?

ws = new WebSocket('wss://echo.websocket.org', {
    port: 443
});

???