mqtt2ws

The A relay bridge between MQTT and WebSocket, you do not need the broker to support websocket.
Via mqtt2ws, you can easily subscribe and publish data in your web browser.

Install

npm install -g mqtt2ws

Usage

mqtt2ws 8080

Design principle

Use restful-like url, say if you want to subscribe topic gyzlab on iot.eclipse.org
The websocket url would look like this
ws://127.0.0.1:8080?host=iot.eclipse.org&topic=gyzlab&qos=0

Example in client-side

//set up related parameter
var host = 'iot.eclipse.org';
var port = '1883';
var topic = 'mqtt2ws'
var qos = 0;
var clientID = 'mqtt2ws'+Math.floor(Math.random()*1000);
//generate url
var url = 'ws://127.0.0.1:8080?host='+host+'&port='+port+'&topic='+topic+'&clientID='+clientID+'&qos='+qos;
//start WebSocket
var ws = new WebSocket(url);
//onopen event
ws.onopen = function()
{
    console.log('WebSocket opened!');
};
//onmessage event. This will behalf as "MQTT's message arriving when subscribing"
ws.onmessage = function (evt) 
{              
    var data = evt.data;        
    console.log(data);  
};
//onclose event
ws.onclose = function(err)
{ 
    console.log('WebSocket closed');
};
//send message. This will behalf as "MQTT's publish message"
ws.send('This message will publish to MQTT broker with topic '+topic);