Objective-C asynchronous TCP socket class. NetSocket is an Objective-C asynchronous TCP socket class that can simplify and even speed up networking in your application. NetSocket buffers both reads and writes behind the scenes, this allows you to read the data at the most convenient time and not worry if a call to send will block or not. Through a series of callbacks, a delegate is notified of socket events ( e.g. connected, disconnected, data available ). To make all of this possible, NetSocket uses new MacOS X networking APIs, mainly CFSocket ( part of the CoreFoundation CFNetwork API ).