Can I develop a service on iOS to register with ANCS so that when iPhone gets a notification the service go through my device BT LE protocol to notify the band? And I read at http://blog.punchthrough.com/post/63658238857/the-apple-notification-center-service-or-wtf-is. I see "ANCS is managed automatically by the iOS device, or “Notification Provider” as its known in ANCS parlance. What this means for you as a developer is that you won’t need to write code to manage ANCS on the iOS side." It means i don't need write code in iOS side that have to implement in my device BT LE ? Thanks for any answer.
Correct. As the link mentions, you use "service solicitation" to get the iOS device's attention while it is passively scanning. You don't need to have an app running on the iOS device, you don't need to submit anything to the App Store--you don't even need to pay to become a developer. Also, I should mention, your hardware design does not need to be submitted to the Apple MFi program.
来源：https://stackoverflow.com/questions/20368746/bluetooth-le-and-ancs-in-ios