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Closest thing I've found is How to incorporate WebSockets into a Cocoa application, but the answers only pointed to an outdated library.
Does anyone know about a WebSockets library compatible with iOS 4.x?
I've also read about Pusherapp, and, as good as the service could be, I would prefer to use my own WebSockets server.
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As you can see from the code snippets above, although the communication is done over WebSockets, the underlying WebSocket protocol is ''hidden'' from developers. You can decide to use any WebSocket-based protocol that supports iOS.
WebSocket is a communication protocol that uses sockets, providing duplex communication over a single TCP connection. It was standardized by the IETF in 2011 and is a different protocol from HTTP. WebSockets are widely used in chat apps, streaming real-time notifications, and stock prices.
NSURLSessionWebSocketTask is a concrete subclass of NSURLSessionTask that provides a message-oriented transport protocol over TCP and TLS in the form of WebSocket framing. It follows the WebSocket Protocol defined in RFC 6455. You create a NSURLSessionWebSocketTask with either a ws: or wss: URL.
The WebSocket API is an advanced technology that makes it possible to open a two-way interactive communication session between the user's browser and a server. With this API, you can send messages to a server and receive event-driven responses without having to poll the server for a reply.
You can check out the UnitT Web Socket Client. It is intended for use in iOS apps using Objective-C. It works with both ws & wss.
I am the author and have been using it in some of my projects with success. Let me know if you run into any trouble and I will do what I can to help.
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Found this post in a google search for iOS WebSockets and wanted to put an updated answer.
Anyways, Zimt and Unitt's client don't support the latest standard (at the time of writing this).
(disclaimer: author of SocketRocket)
We just released a new library that has no external dependencies, supports RFC 6455 completely, and works with iOS 4.x+.
It's called SocketRocket and can be found here
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