[mafaneh]

First, a disclaimer that I'm the author of the e-book listed.

Yes, I agree that getting BLE to work with smartphones is not an easy task. The APIs are ever-changing and evolving and differ across different devices as well. In the end, though, they must adhere to the official specification and provide an interface to the underlying protocol.

There are many embedded developers that are looking to learn the protocol and don't know where to start (myself included, especially when I first starting learning the technology). The specification is quite overwhelming and there is a lack of resources that cover both theory and implementation together.

The book is targeted at embedded developers with the goal to help them learn the basics of the technology by guiding them through various exercises and examples. There are also many new use cases popping up where an embedded platform is used on both ends making the task easier (compared to pairing with a smartphone app).