How to subscribe hivemq broker for web application(asp.net)?

[Sushil Bhat]

I am using HiveMQ broker to publish and subscribe.

I want to develop a subscriber Web application using ASP.Net C# and
M2Mqtt.Net.dll ( version : 4.3.0.0 ). 

I am completely new for mqtt and hivemq, I dont know how to subscribe for web but i am able to subscribe for winforn/WPF application, same way i tried with web, but I think there is different way to do this I spent more time on google ans i got some link

http://www.hivemq.com/blog/build-javascript-mqtt-web-application 

using websocket we have to do this.

So my question is how to use websocket and javascript?

for this do i need some some library(like poho.js, mqtt.js) if yes how to use this? 

Can any one help me step by step what and how to do this?

thanks 

tink

[Paul Fremantle]

To use a MQTT/WS and JS library, you need to do the following.

1) You need a server that supports MQTT/WS.

2) Read this: https://www.npmjs.com/package/mqtt#browser

(I used the browserify option and it worked pretty easily)

This creates a browserMqtt.js which you import. 

Then you can use code like this in your JS <script> section:

<script src="./browserMqtt.js"></script>

<script>

   var client = mqtt.connect("wss://ignite-iot.net:8443", options); 

      client.subscribe("/d/#");

 

      client.on("message", function(topic, payload) {

        message = JSON.parse(payload);

        if ('shortpress' in message) {

        document.getElementById('short').value=Date() ; 

        } else if ('longpress' in message) {

        document.getElementById('long').value=Date() ; 

        }  

      });

 

</script>  

Note my example is using secure WebSockets on port 8443, so yours will probably be different.

Paul

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Paul Fremantle

Doctoral Researcher, University of Portsmouth, School of Computing

Visiting Scientist, Institute of the Architecture of Application Systems, Stuttgart

Visiting Lecturer, Software Engineering Programme, Oxford University

Co-Founder, WSO2
Apache Member and Committer

email: paul.fr...@port.ac.uk, pa...@fremantle.org

twitter: pzfreo / skype: paulfremantle / blog: http://pzf.fremantle.org