Support Request: Enabling BLE DTM for FCC Certification on Zephyr 2.7.0

[Maverick2k]

Hi Nordic Community,

I'm currently working on FCC certification for a project and need to enable BLE Direct Test Mode (DTM). I'm using the `hci_uart` sample and have activated `CONFIG_BT_CTLR_DTM_HCI`. However, I'm encountering the following warning:

```

warning: BT_CTLR_DTM_HCI (defined at subsys/bluetooth/controller/Kconfig:627) was assigned the value 'y' but got the value 'n'. Check these unsatisfied dependencies: BT_CTLR_DTM_HCI_SUPPORT (=n). See docs.zephyrproject.org/.../CONFIG_BT_CTLR_DTM_HCI.html and/or look up BT_CTLR_DTM_HCI in the menuconfig/guiconfig interface. The Application Development Primer, Setting Configuration Values, and Kconfig - Tips and Best Practices sections of the manual might be helpful too.

```

Upon further investigation, I discovered that `BT_LLL_VENDOR_NORDIC` is currently deselecting the `BT_CTLR_DTM_HCI` symbol.

Here are my current setup details:

- Zephyr version: 2.7.0

- Configuration: Using the sample `hci_uart` with `CONFIG_BT_CTLR_DTM_HCI=y`

**My question is:** How can I resolve this issue and enable BLE DTM while staying within the Zephyr framework? Any guidance or suggestions would be greatly appreciated.

Thanks in advance for your help!

[Simonr]

Hi

Please check out the Bluetooth qualification guide we have available here and follow the steps there. I think following the steps for a "pre-qualified design" should be enough for you in this case. But I know very little about your design and application, so take that with a pinch of salt: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/protocols/bt/bt_qualification/index.html#pre-qualified-design 

Best regards,

Simon