In Mastering the XMPP Framework Peter explains step by step with great detail how to build professional iOS applications that make use of the XMPP framework using modern Objective C programming principles.
If you are an iOS developer with some experience and want to develop a WhatsApp like application, this book is certainly worth adding to your library and reading it will save you precious time.
“Mastering the XMPP Framework will be mandatory literature for all our developers and we think it should also be for yours.” -
August de Vocht, C.E.O. Gemoro Mobile Media