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So I try to connect my c# WPF program to a BLE device and this is the code to connect to the device:
private async Task ConnectToWatcher(DeviceInformation deviceInfo) {
try {
// get the device
BluetoothLEDevice device = await BluetoothLEDevice.FromIdAsync(deviceInfo.Id);
// get the GATT service
Thread.Sleep(150);
var gattServicesResult = await device.GetGattServicesForUuidAsync(new Guid(RX_SERVICE_UUID));
service = gattServicesResult.Services[0];
// get the GATT characteristic
Thread.Sleep(150);
var gattCharacteristicsResult = await service.GetCharacteristicsForUuidAsync(new Guid(RX_CHAR_UUID));
characteristic = gattCharacteristicsResult.Characteristics[0];
// register for notifications
Thread.Sleep(150);
characteristic.ValueChanged += (sender, args) => {
Debug.WriteLine($"[{device.Name}] Received notification containing {args.CharacteristicValue.Length} bytes");
};
GattWriteResult result =
await characteristic.WriteClientCharacteristicConfigurationDescriptorWithResultAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
Debug.WriteLine($"Characteristics write result: status={result.Status}, protocolError={result.ProtocolError}");
} catch (Exception ex) when ((uint)ex.HResult == 0x800710df) {
Debug.WriteLine("bluetooth error 1");
// ERROR_DEVICE_NOT_AVAILABLE because the Bluetooth radio is not on.
}
}
The line
Debug.WriteLine($"Characteristics write result: status={result.Status}, protocolError={result.ProtocolError}"
creates the output Characteristics write result: status=protocolError, protocolError=3 I couldn't find anywhere whats that supposed to mean. The effect is the Method characteristic.ValueChanged never gets called.
Do I have to do more to have the characteristic configurated? And has anybody any idea why the method isn't called or what that error message means?
Thanks a bunch.
you need to call CoInitializeSecurity before
more info here. couple of weeks I spent looking for solution :)
https://social.msdn.microsoft.com/Forums/en-US/58da3fdb-a0e1-4161-8af3-778b6839f4e1/
Apparently, some Windows 10 builds have a COM security bug. Solution was to register for Windows-Insider-Program and update Windows.
Update: There are two more solutions to this: 1) Calling CoInitializeSecurity from outside your c#-code (didn't bring it to work) - or- 2) Writing two new keys into the windows registry. You cann create a file "Bluetooth.reg", which will add those two keys on a doubleklick. This answer from https://social.msdn.microsoft.com/Forums/en-US/58da3fdb-a0e1-4161-8af3-778b6839f4e1/bluetooth-bluetoothledevicefromidasync-does-not-complete-on-10015063?forum=wdk was my solution: