A list of centrals that are currently subscribed to the characteristic’s value.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Bluetooth
The value of this property is an array of
CBCentral objects that currently subscribe to the characteristic’s value. The array is empty if the characteristic isn’t configured to support notifications or indications. Even if the characteristic’s configuration supports notifications or indications, the array is empty if centrals aren’t subscribing to the characteristic’s value.