无法通过WebSocket连接Raspberry Pi服务器

Question

There is a server running on a Raspberry Pi which, when authenticated by a String, sends me back Power Metering Info from Smart Plugs in my house every 30 seconds. This Server opens a socket on port 50333.

I can print the responses to the console in Eclipse with Java and Python by just connecting to it with a standard TCP Socket but when I try and use a websocket in javascript it just won't connect....

I have tried :

var ws = new WebSocket("ws://l92.168.1.27:50333");

and:

var tcpsock = new TCPSocket("192.168.1.27", "50333");

and it doesn't connect....I'm just wondering is my syntax right here or is there possibly some underlying factor that isn't explicitly evident?

Answer 1

The WebSocket protocol is named a bit misleadingly. It is not a simple TCP socket for use in JS, but a more complex protocol based on Http involving a handshake and a package format. Your server will have to implement that protocol in order for you to be able to connect to it. The RFC is pretty useful: http://tools.ietf.org/html/rfc6455

It is not that hard to implement, but I bet there are a lot of libraries available that do this for you if you really need it.