DTM Mode -- HCI UART sample

Hi,

Does the HCI UART sample include DTM capabilities? https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/samples/bluetooth/hci_uart/README.html

When issuing the example commands on this sample build on a DK for the NRF52840, I get the following error response:

```

root:~# hcitool -i hci0 cmd 08 34 00 ff 00 02
< HCI Command: ogf 0x08, ocf 0x0034, plen 4
00 FF 00 02
> HCI Event: 0x0f plen 4
01 01 34 20

```

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