如何从iOS中的BLE设备中检索数据？

Question

我想从提供两种服务的BLE设备获取数据，其中一种提供3种特性，另一种提供2种特性。 您能解释一下如何从Swift中的设备中检索数据吗？ 请看一下正确的代码

extension PeripheralConnectedViewController: CBPeripheralDelegate {
func centralManager(_ central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
    if let error = error {
        print("Error connecting peripheral: \(error.localizedDescription)")
    }
}func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    if let error = error {
        print("Error discovering services: \(error.localizedDescription)")
    }

    peripheral.services?.forEach({ (service) in
        services.append(service)
        tableView.reloadData()
        peripheral.discoverCharacteristics(nil, for: service)
    })
}func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    if let error = error {
        print("Error discovering service characteristics: \(error.localizedDescription)")
    }

    service.characteristics?.forEach({ characteristic in
        if let descriptors = characteristic.descriptors {
            print(descriptors)
        }

        print(characteristic.properties)
    })
    for newChar: CBCharacteristic in service.characteristics!{

        peripheral.readValue(for: newChar)
         peripheral.setNotifyValue(true, for: newChar)


    }
}
func peripheral(_ peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: Error?) {
    switch RSSI.intValue {
    case -90 ... -60:
        rssiLabel.textColor = .btOrange
        break
    case -200 ... -90:
        rssiLabel.textColor = .btRed
        break
    default:
        rssiLabel.textColor = .btGreen
    }

    rssiLabel.text = "\(RSSI)dB"
}func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    if  var enableValue =  Character("?").asciiValue{
        let enablyBytes = NSData(bytes: &enableValue, length: MemoryLayout<UInt8>.size)
        self.peripheral.writeValue(enablyBytes as Data, for: characteristic, type: CBCharacteristicWriteType.withResponse)

    }

    print(characteristic)
}
func peripheral(_ peripheral: CBPeripheral, didUpdateNotificationStateFor characteristic: CBCharacteristic, error: Error?) {

}