UWP应用程序无法在“ BluetoothCacheMode.Uncached”模式下工作，而只能在“ BluetoothCacheMode.Cached”模式下工作，为什么？

Question

I am using this code--> https://github.com/Microsoft/Windows-universal-samples/blob/master/Samples/BluetoothLE/cs/Scenario2_Client.xaml.cs on "Blue Gecko bgm13p22" microcontroller BLE device to read its services and characterstics. If I use "BluetoothCacheMode.Uncached" mode it says "Device Unreachable" but when I use "BluetoothCacheMode.Cached" mode it shows already stored characterstics or services, but not in real time.

Why is this happening?

Please help Thanks

Answer 1

You say "already stored characteristics or services", so I presume you have successfully read them at least once. They have been saved in the Bluetooth Cache.

In your instance, using BluetoothCacheMode.Cached doesn't connect to the device to look for characteristics - it looks in the Bluetooth cache, that's why it doesn't show them "real time". Using BluetoothCacheMode.Uncached attempts a connection and it fails.

With "Device Unreachable" as a response, the first thing to try is to refresh the device object.

    BluetoothLEDevice device = await BluetoothLEDevice.FromIdAsync(deviceId); 
    .....