var client = new Array();

var W3CWebSocket = new Array();

var concurrent = 2;

for (var i = 0; i < concurrent; i++) {

    W3CWebSocket[i] = require('websocket').w3cwebsocket;

    client[i] = new W3CWebSocket[i]('ws://115.29.199.8:8000/chat');

    client[i].onerror = function () {

        console.log('Connection Error');

    };

    client[i].onopen = function () {

        console.log('WebSocket Client Connected');

        sendNumber(i);

    };

    client[i].onclose = function () {

        console.log('Client Closed');

    };

    client[i].onmessage = function (e) {

        if (typeof e.data === 'string') {

            console.log("Received: '" + e.data + "'");

        }

    };

}

function sendNumber(i) {

    console.log("client " + i + " is " + client[i]);

    if (client[i].readyState === client.OPEN) {

        var number = Math.round(Math.random() * 0xFFFFFF);

        client[i].send('{"message":"how are you?"}');

        setTimeout(sendNumber(i), 1000);

    }

}