I dont beleive you can access network sockets in pure Objective-C, the socket part of Cocoa Touch
Framework is based on the Core Foundation Framework, which is a low level C based framework.

You can convert primitive C data types into Objective-C data types, but all of your code will have to
be calling C functions and structs.

The main Apple resource for the CFSocket reference is at the link below.

https://developer.apple.com/library/...c/uid/20001445

And the reference guide is also worth reading.

https://developer.apple.com/library/...uid/TP30001132

Regards Mark