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// svghmi.js

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(function(){

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    // Open WebSocket to relative "/ws" address

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    var ws = new WebSocket(window.location.href.replace(/^http(s?:\/\/[^\/]*)\/.*$/, 'ws$1/ws'));

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    // Register message reception handler 

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    ws.onmessage = function (evt) {

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        // TODO : dispatch and cache hmi tree updates

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        var received_msg = evt.data;

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        // TODO : check for hmitree hash header

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        //        if not matching, reload page

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        alert("Message is received..."+received_msg); 

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    };

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    // Once connection established

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    ws.onopen = function (evt) {

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        // TODO : enable the HMI (was previously offline, or just starts)

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        //        show main page

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        // TODO : prefix with hmitree hash header

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        ws.send("test");

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    };

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})();