See documentation for more information.

var ws = require('ws');
var event = require('event');

ws.broadcast(1, { blubb: 'blubb' });

event.on('ws.connect', function(id) {
    ws.write(id, 1, { blubb: 'blubb' });
});
event.on('ws.disconnect', function(id) {

});
event.on('ws.data', function(id, type, data) {
    var data = JSON.parse(data.toString());
}); 

var proto = (window.location.protocol == 'https:') ? 'wss' : 'ws';
var conn = new WebSocket(proto + "://" + document.location.host + "/api/v1/b/" + botId + "/i/" + instanceId + "/ws");
conn.onclose = function (evt) {
    console.log('close', evt);
    alert('Closed.');
};
conn.send(JSON.stringify({ type: 'ping' }));
conn.onmessage = function (evt) {
    var data = JSON.parse(evt.data);
};