Kotak Neo Websocket zip contains 4 major files :
HSLib
Demo.html
Demo.js
Neo.js
To Start the websocket make sure the position of these files are aligned as shown in below example :

To Start Websocket open demo.html file, this file will open a web page in your browser which will like this :

Now to establish the connect user needs to pass 3 parameters
'dataCenter': '123'
Note: If you’re using postman for testing https://mis.kotaksecurities.com/login/1.0/tradeApiValidate would return all the above 3 values.
Example:

Lets understand how to connect to HSM
HSM is nothing but that which streams market data.