'Magic Wand' is an alternative, client-only implementation of the DoIP protocol, which is very simple and only supports the most commonly used protocols. It is available for the iPhone OS and is written in Objective C. Because of its simplicity, it is a great library to use if you want to learn more about the protocol.
With Magic Wand, it is also easier to integrate with Cocoa (Touch) than using EPFramework (using EPFramework requires a little more work, because you have to translate between C++ strings and NSStrings all the time, use reference counting and Cocoa memory management at the same time, etc.). Magic Wand cannot be used to publish endpoints. Because of the limitations of the iPhone OS, Magic Wand currently only works with IPv4, and not over IPv6.