GattCharacteristic.ProtectionLevel fails

[corby]

I have a BLE device that has several services including one custom service with 2 characteristics. The CHARs are setup as RX/TX. The RX CHAR receives commands and the TX CHAR sends responses using NOTIFY. Everything works fine using BluetoothLEDevice to connect and read. I can also configure the CCCD on the standard CHARs to send nodifications.

Here's the problem: The custom TX CHAR has AUTHENTICATION_REQUIRED set on the CCCDescriptor. So when I call. WriteClientCharacteristicConfigurationDescriptorAsync I get an AccessDenied error and a message saying I need to enable Authentication before writing to this attribute.

I've tried the following:

• DeviceInformationPairing.PairingAsync - Doesn't do anything. protection level set to PLAIN.
• Custom Pairing - ConfirmOnly with handler. Nothing. Protection level == PLAIN
• Scan and read in all Chars and set ProtectionLevel.AuthenticationRequired. When I write the CCCD after this I get an UNREACHABLE error

I'm at a loss on how to get this device to read using windows (Linux DBus, MacOSX CoreDevice, and nRF softdevice have no issues)

I'm using python with winrt bindings

[stevewhims]

Thanks, @corby, I've pinged the product team subject-matter experts for help.

-Steve

[stevewhims]

Can you give us more information on what's meant by “doing nothing”, as in exactly how are you calling the pairing APIs and how is it failing?

Thanks!