BSD Sockets don't behave in a iPhone 3G environment

Question

I noticed that many times while developing for an iPhone 3G, BSD socket functions will simply fail. I also noticed at the time, the 3G antenna wasn\'t even ON, nor was ther

Answer 1

The CFStream Socket Additions are what Apple recommends you use instead of the direct BSD sockets. They specifically warn about using the BSD sockets here:

Although BSD (POSIX) networking APIs are available in iPhone OS, you should avoid using them. If you communicate directly with sockets, certain networking capabilities of iPhone OS, such as VPN On Demand, do not work. Use the APIs provided in CFStream Socket Additions instead.

Note that CFNetwork and the like aren't Objective-C, but straight C for almost everything.