Scratch wss server example

wss_server.js

/* I used this web page as a basis: http://www.chovy.com/web-development/self-signed-certs-with-secure-websockets-in-node-js/
   1. I created the key and cert using the instructions.
   2. I created a modified secure websocket server - included below
   3. I created a simplified Scratch extension - included below.
   
   4. I added the cert to firefox using the instructions in the article for Chrome. This worked
   5. I tried to add the cert to chrome by accessing https://0.0.0.0:1234, but this brought me to a search page.
   6. I then created a pkc12 cert and used the settings to add it to chrome, but could not get a wss connection.

   Bottom line - I got Firefox to work, but not chrome

*/
/**
 * A test web socket server
 * Created by Alan Yorinks on 4/9/15.
 */

var https = require('https');
var fs = require('fs');



var privateKey  = fs.readFileSync('key.pem', 'utf8');
var certificate = fs.readFileSync('cert.pem', 'utf8');

var credentials = {key: privateKey, cert: certificate};


var httpsServer = https.createServer(credentials, function (request, response) {
    console.log("Req = " + request);
    // We are not processing any HTTP, so this is an empty function. 'server' is a wrapper for the
    // WebSocketServer we are going to create below.
});

httpsServer.listen(1234);

var WebSocketServer = require('ws').Server;
var wss = new WebSocketServer({
    server: httpsServer
});

wss.on('connection', function connection(ws) {
    ws.on('message', function incoming(message) {
        console.log('received: %s', message);
    });

    ws.send('something');
});



/* This is the accompanying Scratch test extention */

new (function () {
    var ext = this;

    var boardStatus = 0;


    /*******************************
     **** Websocket support     ****
     *******************************/
    var socket = new WebSocket('wss://' + '0.0.0.0' + ':' + 1234);

    socket.binaryType = "arraybuffer";

    // attach an onopen handler to this socket. This message is sent by a servers websocket
    socket.onopen = function (event) {

        console.log("onopen message received");
        // change the board status to green with the first board added, since we don"t know ahead of time
        // how many boards are attached
        boardStatus = 2;
        beenOpened = true;
    };

    socket.onclose = function (event) {
        console.log("on close received");
        boardStatus = 1;
        //if (beenOpened == false) {
        ///    alert("Restart the server and then reload the browswer");
        //}
    };

    //        // Process messages received from the server associated with this socket.
    socket.onmessage = function (message) {

        sensor_data = message.data;

        console.log(sensor_data);
    };

    /*****************************************************************************************************/
    /***********************************   Scratch Program Block Handlers, ******************************/
    /*****************************************************************************************************/

    // Associate a handler for each block described in the blocks section below

    /********************* asynchronous messages from scratch ****************************************/
        // Cleanup function when the extension is unloaded
    ext._shutdown = function () {
        boardStatus = 0;
        var msg = "reset_esplora";
        socket.send(msg);
    };

    // Status reporting code - part of boilerplate provided by Scratch
    // Set the "LED" on the Scratch Editor
    ext._getStatus = function () {

        return {
            status: boardStatus,
            msg: "Ready"
        };
    };

    /*******************************
     **** Command Block Handlers ****
     *******************************/

    ext.board_led = function (state) {
        var msg = "board_led/" + state;
        socket.send(msg);
    };



    // Block and block menu descriptions
    var descriptor = {
        blocks: [
            [" ", "Yellow LED %m.off_on", "board_led", "Off"]
        ],
        menus: {
            off_on: ["Off", "On"]
        },
        url: "http://mryslab.blogspot.com/"
    };


    // Register the extension
    ScratchExtensions.register("esp4s_v001_Feb_27_2015", descriptor, ext);

})();

I'm the guy who wrote the article. I believe you have to go to port 443 first and accept the cert before you try to use it over sockets.