In my UWP application, I want to connect to a Bluetooth low energy peripheral device and subscribe to its notification characteristic. this is the application Connect
method:
private async Task Connect(string id)
{
var device = await BluetoothLEDevice.FromIdAsync(id);
var gattService = (await device.GetGattServicesForUuidAsync(Guid.Parse("00002600-005d-0012-00ef-00000000717f"))).Services.FirstOrDefault();
if (gattService != null)
{
var notificationCharacteristic = (await gattService.GetCharacteristicsForUuidAsync(Guid.Parse("00009e76-0c4d-0db6-08b6-000000020445"))).Characteristics.FirstOrDefault();
if (notificationCharacteristic.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Notify))
{
try
{
var result = await notificationCharacteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
}
catch (Exception ex)
{
}
}
}
}
The problem is when I try to write to the notification characteristic, the WriteClientCharacteristicConfigurationDescriptorAsync
method raise an exception:
The attribute cannot be written. (Exception from HRESULT: 0x80650003)
I test this scenario using android application and I can write notification characteristic without any problem. I want to know what the problem in UWP?
Update: I change the UUID of notification characteristic descriptor from the peripheral device and see that the problem was solved.
我发现了问题,经过一些测试,我从外围设备更改了通知特征描述符的UUID,看到问题解决了。
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