Unicast Client App interacting with non-nordic Headset

[selim.pousse]

nrf Toolchain: 2.7.0
nrf Connect SDK : 2.7.0
Gateway: nrF5340 Audio DK
Headset: Earbud 'MOMENTUM TW 4' (Sennheiser)

I try to run and test this following application Unicast Client into the nrF5340 Audio DK (as role gateway) which should interact with my earbud 'MOMENTUM TW 4' (as role headset).

=> the Bluetooth paring and connection between the nrF5340-Audio-DK (as role gateway) and the earbud 'MOMENTUM TW 4' (as role headset) are successfull,
But a error occurs afterwards and I hear no sound into the earbuds. Here are the logs:

*** Booting nRF Connect SDK v2.7.99-8765c758005e ***
*** Using Zephyr OS v3.6.99-8bd088c7c293 ***
GW [00:00:00.268,920] <inf> board_version: Compatible board/HW version found: 1.0.0
GW [00:00:00.293,823] <inf> fw_info: 
         nRF5340 Audio nRF5340 Audio DK cpuapp                      
         NCS base version: 2.7.99                           
         Cmake run : Fri Aug 16 12:14:49 2024
GW [00:00:00.293,853] <inf> fw_info: ------- DEBUG BUILD -------
GW [00:00:00.293,853] <inf> fw_info: Compiled for GATEWAY device
GW [00:00:00.362,762] <inf> bt_keys: SC LTK: 0x1895434034798a4223cf14ed5c7191af
GW [00:00:00.364,562] <inf> bt_mgmt: Clearing all bonds
GW [00:00:00.366,516] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 5.4 (0x0d), Revision 8751
GW [00:00:00.366,729] <inf> bt_mgmt: Local identity addr: C6:95:06:0E:89:94 (random)
GW [00:00:00.366,851] <inf> audio_usb: Ready for USB host to send/receive.
GW [00:00:00.370,666] <inf> bt_mgmt_scan: Local addr: 77:C4:44:3E:64:AB (random). May time out. Updates not printed
GW [00:00:00.370,697] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:00.429,260] <inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:54:D2:5F (public)
GW [00:00:00.502,105] <inf> bt_mgmt: Connected: 80:C3:BA:54:D2:5F (public)
GW [00:00:00.502,166] <inf> main: Connection event. Num connections: 1
GW [00:00:01.713,714] <inf> main: Security changed
GW [00:00:01.804,473] <inf> bt_keys: SC LTK: 0xdeff6a9bc66c143bc108fbdb2ddc5f00
GW [00:00:01.863,555] <wrn> unicast_client: Got err: 0 from conn: 0x20004a30
GW [00:00:01.864,990] <inf> bt_mgmt_scan: Local addr: 77:C4:44:3E:64:AB (random). May time out. Updates not printed
GW [00:00:01.864,990] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:02.223,632] <inf> bt_vol_ctlr: VCS discover finished
GW [00:00:06.153,625] <err> bt_bap_unicast_client: Unable to find ASE Control Point
GW [00:00:06.153,656] <wrn> unicast_client: No sinks found
GW [00:00:06.153,747] <err> unicast_client: Failed to start unicast sink audio: -22

I have added this 2 additional config parameters into the prj.conf :

CONFIG_BT_DEVICE_NAME="MOMENTUM TW 4"
CONFIG_BT_LOG_SNIFFER_INFO=y

# Enable the Auracast/Broadcast mode
# CONFIG_TRANSPORT_BIS=y

Can you support me to solve the issue ?

Thank in advance for your answers and best regards.

[dejans]

Hi,

Unicast Audio client implements CIS gateway mode. Do you see the same error when you remove CONFIG_TRANSPORT_BIS=y from your configuration? 

Best regards,
Dejan

[selim.pousse]

Hi,

You could also try to power on the earbuds and put into ear first (for a couple of seconds) before starting CIS gateway. Does this make any difference?

=> I doesn't make any difference. here are the logs

*** Using Zephyr OS v3.6.99-8bd088c7c293 ***
GW [00:00:00.269,012] <inf> board_version: Compatible board/HW version found: 1.0.0
GW [00:00:00.293,914] <inf> fw_info: 
         nRF5340 Audio nRF5340 Audio DK cpuapp                      
         NCS base version: 2.7.99                           
         Cmake run : Thu Aug 29 08:10:00 2024
GW [00:00:00.293,914] <inf> fw_info: ------- DEBUG BUILD -------
GW [00:00:00.293,914] <inf> fw_info: Compiled for GATEWAY device
GW [00:00:00.362,854] <inf> bt_keys: SC LTK: 0x684db1200dee505a1155c101ec74ace9
GW [00:00:00.365,142] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 5.4 (0x0d), Revision 8751
GW [00:00:00.365,325] <inf> bt_mgmt: Local identity addr: C6:95:06:0E:89:94 (random)
GW [00:00:00.365,447] <inf> audio_usb: Ready for USB host to send/receive.
GW [00:00:00.369,384] <inf> bt_mgmt_scan: Local addr: 73:0B:BA:72:0A:3F (random). May time out. Updates not printed
GW [00:00:00.369,384] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:03.902,160] <inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:54:D2:5F (public)
GW [00:00:04.411,407] <inf> bt_mgmt: Connected: 80:C3:BA:54:D2:5F (public)
GW [00:00:04.411,437] <inf> main: Connection event. Num connections: 1
GW [00:00:04.483,581] <inf> main: Security changed
GW [00:00:04.573,577] <wrn> unicast_client: Got err: 0 from conn: 0x20006910
GW [00:00:04.575,286] <inf> bt_mgmt_scan: Local addr: 73:0B:BA:72:0A:3F (random). May time out. Updates not printed
GW [00:00:04.575,286] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:04.913,574] <inf> bt_vol_ctlr: VCS discover finished
GW [00:00:08.813,568] <err> bt_bap_unicast_client: Unable to find ASE Control Point
GW [00:00:08.813,568] <wrn> unicast_client: No sinks found
GW [00:00:08.813,690] <err> unicast_client: Failed to start unicast sink audio: -22
GW [00:00:34.463,562] <inf> bt_mgmt: Disconnected: 80:C3:BA:54:D2:5F (public), reason 0x13 
GW [00:00:34.463,623] <inf> main: Disconnection event. Num connections: 0
GW [00:00:34.465,332] <inf> bt_mgmt_scan: Local addr: 73:0B:BA:72:0A:3F (random). May time out. Updates not printed
GW [00:00:34.465,332] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:34.661,224] <inf> bt_mgmt_scan: Creating connection to device: 80:C3:BA:54:D2:5F (public)
GW [00:00:34.906,982] <inf> bt_mgmt: Connected: 80:C3:BA:54:D2:5F (public)
GW [00:00:34.907,012] <inf> main: Connection event. Num connections: 1
GW [00:00:34.978,240] <inf> main: Security changed
GW [00:00:35.058,654] <wrn> unicast_client: Got err: 0 from conn: 0x20006910
GW [00:00:35.060,058] <inf> bt_mgmt_scan: Local addr: 73:0B:BA:72:0A:3F (random). May time out. Updates not printed
GW [00:00:35.060,089] <inf> bt_mgmt_scan: Scanning successfully started
GW [00:00:35.438,751] <inf> bt_vol_ctlr: VCS discover finished
GW [00:00:39.368,225] <err> bt_bap_unicast_client: Unable to find ASE Control Point
GW [00:00:39.368,225] <wrn> unicast_client: No sinks found
GW [00:00:39.368,347] <err> unicast_client: Failed to start unicast sink audio: -22

[dejans]

Hi,

The error from the log "<err> bt_bap_unicast_client: Unable to find ASE Control Point" might indicate some problem with earbuds, such as not having the newest firmware or potentially lacking full support for LE Audio. Can you check if your earbuds have full support for LE Audio and that they are updated with the latest firmware?

Best regards,
Dejan