On NCS 3.3.0, is zephyr/samples/bluetooth/hci_uart for nrf54l15dk/nrf54l15/cpuapp expected to operate as a generic HCI controller with BlueZ on Linux, or is an additional overlay/configuration required for PTS/autopts?
try to attach
[lf@fedora dev]$ sudo btattach -B /dev/ttyACM2 -S 1000000 -R
Attaching Primary controller to /dev/ttyACM2
Switched line discipline from 0 to 15
Device index 1 attached
Unable to create user channel socket: Device or resource busy(-16)
Manufacturer: 89
Here is the btmon trace
= New Index: 00:00:00:00:00:00 (Primary,UART,hci1) [hci1] 13.737958
= Open Index: 00:00:00:00:00:00 [hci1] 13.738018
= Index Info: 00:00:00:00:00:00 (internal use) [hci1] 13.738028
= Close Index: 00:00:00:00:00:00 [hci1] 13.738045
= Open Index: 00:00:00:00:00:00 [hci1] 13.738392
= Index Info: 00:00:00:00:00:00 (internal use) [hci1] 13.738395
btattach[264721]: @ USER Open: btattach (privileged) version 2.22 {0x0002} [hci1] 13.738400
btattach[264721]: < HCI Command: Read Local Version Information (0x04|0x0001) plen 0 #1 [hci1] 13.738460
> HCI Event: Command Complete (0x0e) plen 12 #2 [hci1] 13.738942
Read Local Version Information (0x04|0x0001) ncmd 1
Status: Success (0x00)
HCI version: Reserved (0x10) - Revision 12451 (0x30a3)
LMP version: Reserved (0x10) - Subversion 12451 (0x30a3)
Manufacturer: Nordic Semiconductor ASA (89)
btattach[264721]: @ USER Close: btattach {0x0002} [hci1] 13.739044
= Close Index: 00:00:00:00:00:00