func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
        kestrelPeripheral = peripheral
        kestrelPeripheral.delegate = self
        manager.connect(kestrelPeripheral)
        manager.stopScan()
        self.kestrelIsConnected = true

    }
    func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {

        delegate?.didDisconnect()
        cancelReading()
        self.kestrelIsConnected = false
        self.manager = CBCentralManager(delegate: self, queue: nil)
    }

    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        self.isInitialReading = false
        kestrelPeripheral.discoverServices(nil)
        delegate?.didConnect()
    }