send command via tcp ip through javascript

Question

I want to achieve following functionality and need the help for the same:

1. I have one server on which there is device connected that prints some bar codes based on pre-formatted command given to it.

2. Currently there is one desktop application which generates the command and does the job.

3. Now I want to do this via web, meaning there will be one webpage (say .aspx) and I want to achieve this by javascript.

I am able to generate the pre-formatted command required for printing but I don't know how to send the command to server, whether socket tcp ip or something else.

I have tried using node.js, socket.io, json-socket etc. but nothing is working,

Answer 1

If javascript is a fixed requirement, then no I don't think you'll find a direct solution. You will need to create an intermediary service that will translate websocket protocol to the tcp/ip protocol your software communicates on. I found a package called Websockify that has implementations of this kind of bridge in a few different languages.

Although if you are open to using Flash on the front end, and can meet the security requirements on your backend connection, then Flash socket API could work. I believe Java applets can also manage this.