BleWinrtDll.cpp:501 SubscribeCharacteristicAsync catch: 属性需要进行身份验证，然后才能读取或写入。

[Jason-Chn95]

May I ask if this is the reason why the sensor needs authentication or something else? This is the first time for me to do this Bluetooth function.

[Jason-Chn95]

[adabru]

I didn't do any bluetooth authentication yet. From the error message I'd also guess you need it.

Maybe pairing it will help:
https://docs.microsoft.com/en-us/windows/uwp/devices-sensors/bluetooth-dev-faq#why-does-my-bluetooth-le-device-stop-responding-after-a-disconnect . You could also try the microsoft sample https://github.com/microsoft/Windows-universal-samples/tree/master/Samples/BluetoothLE and see whether you can read the value without authentication instead of subscribing to it. You can also use the microsoft sample to try out the pairing code.

[Jason-Chn95]

I didn't do any bluetooth authentication yet. From the error message I'd also guess you need it.

Maybe pairing it will help:
https://docs.microsoft.com/en-us/windows/uwp/devices-sensors/bluetooth-dev-faq#why-does-my-bluetooth-le-device-stop-responding-after-a-disconnect . You could also try the microsoft sample https://github.com/microsoft/Windows-universal-samples/tree/master/Samples/BluetoothLE and see whether you can read the value without authentication instead of subscribing to it. You can also use the microsoft sample to try out the pairing code.

Thanks adabru for your help,now I solved this problem.I have another question. Do you know how to do it?I want to connect two Bluetooth devices on my PC,how to do this ?

[adabru]

I guess each bluetooth device normally has a unique device id. In that case you should be able to just call the functions with different device-ids. Each received data-package contains information about the device it was sent from. Likewise, in each data-package you send you can specify the device-id it should go to.

[Jason-Chn95]

我猜每个蓝牙设备通常都有一个唯一的设备ID。在这种情况下，您应该能够仅使用不同的设备ID来调用函数。每个接收到的数据包都包含有关其发送设备的信息。同样，在您发送的每个数据包中，您都可以指定设备编号。

Thank you. I can only send you a star

[Augmentaio]

Hi Jason, did you face this issue (SubscribeCharacteristicAsync catch) when testing with beacons? How did you solve it?

[Jason-Chn95]

Hi Jason, did you face this issue (SubscribeCharacteristicAsync catch) when testing with beacons? How did you solve it?

Sorry,I didn't have that problem