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We have a custom designed device that contains nRF51822 System on Chip from Nordic and we want to be able to exchange the data with it over Bluetooth Low Energy (BLE) link. We are using Apple Notification Center Service (ANCS) so our custom device can wake up our app from sleep after receiving a notification, so we need to look for and subscribe to the ANCS primary service on our custom designed device to start this process. nRF51822 SoC on our custom device can successfully discover ANCS Service on the iPhone (UUID = 0xF431) and explicitly enable Notification Source Notifications and Data Source Notifications on the custom device side. What is not clear to us is whether our custom device can successfully become a Notification Consumer (NC) and get notified by the iPhone (Notification Provider) of incoming notifications without the Bluetooth Pairing Request popup. As the documentation says, "All these characteristics require authorization for access.". Is this authorization shown through the Bluetooth Pairing Request system popup? We asked Nordic about that (link) but they did not have a right answer and suggested to contact Apple.