Tim Oliver works on DriveMode, an interesting app with a Bluetooth hardware component. He also worked at Realm, yes the Core Data and SQLite alternative. He is originally from Australia, but for work he has been pretty much around the globe.
You can find Tim:
More on DriveMode: https://twitter.com/drivemode
This is an article Tim wrote: Getting started with Core Bluetooth
Tim recommends this Ray Wenderlich tutorial and this old, but still really useful presentation about Core Bluetooth. Tim thinks this is the sensortag used in Chris' presentation.
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