Hi, I am responding to your bid request. This certainly sounds like an interesting project! I definitely have the requisite iOS development and PDF experience. I'm not terribly familiar with iBook Author though. It looks like iAuthor widgets are just HTML5/Javascript, so based on just that information, before researching any further, I don't believe what you are wanting would be possible since the widget simply wouldn't be able to access your Bluetooth library, something like that would require a custom native app.