fun subscribe(peer: BitGattPeer, serviceUuid: UUID, characteristicUUID: UUID, isIndication: Boolean = false): Completable
Subscribe to given characteristic hosted on remote device
serviceUuid - GATT service hosting the characteristic to subscribe to
characteristicUUID - GATT characteristic to subscribe to
isIndication - whether the notification type is indication (by default, it's set to notification)
GattServiceNotFoundException - if given service is not found