Hi Hilda, > The MSFT extension has a HCI_VS_MSFT_Read_Supported_Features command. The AOSP extension has a read capability cmd too. > https://docs.microsoft.com/en-us/windows-hardware/drivers/bluetooth/microsoft-defined-bluetooth-hci-commands-and-events#hci_vs_msft_read_supported_features > https://source.android.com/devices/bluetooth/hci_requirements#vendor-specific-capabilities > If commands did not support, the controller should feedback event status as Unknown HCI Command (0x01). > We can go on this way. I am not doing trial-and-error programming here. I rather better disable any extensions for Realtek devices altogether. Regards Marcel
