How Bluetooth device can display incoming calls from iPhone?

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How can I handle the incoming calls and SMS from my iPhone and immediately send data to my Bluetooth device(watches)? I have already implement characteristic that helps displays some data on watch's display. But I don't know how to handle incoming calls and SMS. As I understand programmers use ANCS, but I don't find how it implements.

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Phineas Huang On

First, your device needs to connect with your mobile. Followed, your device discover service (UUID is 7905F431-B5CE-4E99-A40F-4B1E122D00D0), then you could use it to get your information. More information you could see The Apple Notification Center Service.

Service UUID is 7905F431-B5CE-4E99-A40F-4B1E122D00D0.

Notification Source: UUID 9FBF120D-6301-42D9-8C58-25E699A21DBD (notifiable)

Control Point: UUID 69D1D8F3-45E1-49A8-9821-9BBDFDAAD9D9 (writeable with response)

Data Source: UUID 22EAC6E9-24D6-4BB5-BE44-B36ACE7C7BFB (notifiable)