This is the best resource on the subject, written by the designer of the protocol. The author is, surprisingly, a pretty good writer. This not only gives you

This is the best resource on the subject, written by the designer of the protocol. The author is, surprisingly, a pretty good writer. This not only gives you everything you need to know (without grokking the spec), but also talks a lot about why they made the decisions they did. Highly recommend... http://www.amazon.com/Bluetooth-Low-Energy-Developers-ebook/dp/B009XDA1G8 http://www.amazon.com/Bluetooth-Low-Energy-Developers-ebook/...