- (instancetype)init NS_UNAVAILABLE;

typedef NS_ENUM(NSInteger, CBManagerState) {
    CBManagerStateUnknown = 0,
    CBManagerStateResetting,
    CBManagerStateUnsupported,
    CBManagerStateUnauthorized,
    CBManagerStatePoweredOff,
    CBManagerStatePoweredOn,
} NS_ENUM_AVAILABLE(NA, 10_0);

@property(nonatomic, assign, readonly) CBManagerState state;