Question

Hello Users， 我有一个关于Windows 10上的蓝牙BLE API的具体问题。目前我在C＃（Visual Studio）上编写一个工具，它将自己连接到给定的BLE - Device。然而，连接工作完美，我可以读出 ServiceUUIDs 和 CharacterUUIDs 。

主要问题是在我尝试读取Character的值后，它总是返回00.我听说实现通知会改变它。我跟着来自https://docs.microsoft.com/en-us/windows/uwp/devices-sensors/gatt-client的指示，但是他们没有给我很多帮助（=＆gt;相同的结果）;

（以下是bluetooth.com的规格： https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.battery_level.xml）

这是我的代码： //连接到BluetoothDevice var device = await BluetoothLEDevice.FromIdAsync（address）;

        //get UUID of Services
        var services = await device.GetGattServicesAsync();
        if (services != null)
        {
            foreach (var servicesID in services.Services)
            {

                //if there is a service thats same like the Battery Service
                if (servicesID.Uuid.ToString() == BluetoothBLE.Constants.BATTERY_SERVICE)
                {
                    //updateServiceList is like a console logging in my tool
                    updateServiceList($"Service: {servicesID.Uuid}");

                    var characteristics = await servicesID.GetCharacteristicsAsync();
                    foreach (var character in characteristics.Characteristics)
                    {
                        if (Constants.BATTERY_LEVEL == character.Uuid.ToString())
                        {

                            updateServiceList("C - UUID: "+ character.Uuid.ToString());
                            GattReadResult result = await character.ReadValueAsync();
                            if (result.Status == GattCommunicationStatus.Success)
                            {
                               var reader = DataReader.FromBuffer(result.Value);
                               byte[] input = new byte[reader.UnconsumedBufferLength];
                               reader.ReadBytes(input);
                               System.Diagnostics.Debug.WriteLine(BitConverter.ToString(input));


                            }







                        }
                        }

                }

因此，在运行我的代码后，系统会记录“00”。电池电量的字符UUID（0x2A19，来自https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.characteristic.battery_level.xml）成功为红色，但值很奇怪。< / p>

我很感激每一个答案。谢谢。

蓝牙BLE电池电量 - C＃

0 个答案: