fun setupNotifications(characteristic: BluetoothGattCharacteristic, subscribe: Boolean, isIndication: Boolean = false): Single<BluetoothGattCharacteristic>
Combined operation to set up notifications on a characteristic (enables notifications + writes to descriptor This assumes we are connected to the peer.
characteristic - The BluetoothGattCharacteristic on which to enable notifications.
subscribe - true/false, whether we are subscribing from the characteristic or unsubscribing
isIndication - true/false, whether the notification type is indication or notification
Return
A Single containing the BluetoothGattCharacteristic on which notifications were setup/disabled