如何在不使用 js 库的情况下使用 websocket 连接 mqtt？

Question

I have a business requirement where I want to connect mqtt server(in my case using mosquito) without using available libraries like paho js or others. Instead of using libraries I want to use simply

var ws = new Websocket(maqtt_url);

After creating websocket connection I want to subscribe on a single topic and receive messages. Subscription to topic can be hard coded.

Is this possible?

Answer 1

Sure it's possible, but your just going to end up re-writing all of the paho library yourself and including it in your application.

If you really want to go down this path then the MQTT spec can be found here which will tell you the format of the

• Connection Packet
• Subscription Packet
• Message Packet
• Keep Alive Packet

all of which you will need to implement in order to maintain a connection to the broker.

Answer 2

An mqtt over websockets example with encoding of the mqtt protocol data without using a library is available here . It maybe a good starting point for developing applications.