How works the Broadcast Source Device with Broadcast Audio Assistant and non-nordic headset compatible Auracast.

[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 "Broadcast Source"  into the nrF5340 Audio DK (as role gateway) which should interact with auracast earbuds 'MOMENTUM TW 4' (as role headset).

As far as I understand , we need an intermediate "Broadcast Audio Assistant Device" which can be a smartphone (using nrf Connect Mobile ?), a PC, or a nrf-DK with LE audio support:

Use Case 1: Try to use the nrF5340 Audio DK (running "Broadcast Source" app) as gateway, my smartphone as Broadcast Audio Assistant Device and my auracast eardbud 'MOMENTUM TW 4' as headset.
The broadcast service of nrF5340 is published and detected by the nrf Connect mobile app. but my smartphone doesn't support the LE audio support. Is it necessary for the smartphone to support the LE Audio to manage the nrF5340 broadcast service and be able to select the advertisement or the channel wished to be listened ?

Use Case 2: Try to use a 1st nrF5340 Audio DK as gateway, a second nrF5340 Audio DK as Broadcast Audio Assistant, and auracast Headset 'MOMENTUM TW 4'
"Broadcast Audio Assistant" provided by Zephyr Project seems not working into the 2nd nrF5340-Audio-DK which play the role of the Assistant. According the doc, only nrf52840dk is supported.

*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
[00:00:00.415,588] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.415,649] <inf> bt_hci_core: HW Variant: nRF53x (0x0003)
[00:00:00.415,649] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 214.51162 Build 1926957230
[00:00:00.417,419] <inf> bt_hci_core: Identity: C6:95:06:0E:89:94 (random)
[00:00:00.417,449] <inf> bt_hci_core: HCI: version 5.4 (0x0d) revision 0x21fb, manufacturer 0x0059
[00:00:00.417,480] <inf> bt_hci_core: LMP: version 5.4 (0x0d) subver 0x21fb
Bluetooth initialized
[00:00:00.419,738] <wrn> bt_hci_core: opcode 0x2041 status 0x01
Scanning failed to start (err -5)

First, what I try to achieve makes sense ? if yes, can you help me to understand this issue of running an Broadcast Audio Assistant into a nrF5340-Audio-DK.

Thank in advance for your answers and Best Regards.

[Amanda Hsieh]

Closed as duplicated  Unicast Client App interacting with non-nordic Headset   

[selim.pousse]

Why this ticket has been closed ?
this use case has nothing to do with the Unicast Client which implements CIS gateway mode. I'm testing here the Auracast mode which implements BIS gateway mode.

# Enable the Auracast/Broadcast mode
CONFIG_TRANSPORT_BIS=y

Logs:

GW [00:00:01.361,206] <inf> audio_usb: USB RX first data received.
*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
GW [00:00:00.270,294] <inf> board_version: Compatible board/HW version found: 1.0.0
GW [00:00:00.306,060] <inf> sd_card: SD card volume size: 15280 MB
GW [00:00:00.311,523] <inf> fw_info: 
         nRF5340 Audio nRF5340 Audio DK cpuapp                      
         NCS base version: 2.7.0                            
         Cmake run : Thu Aug 15 18:55:15 2024
GW [00:00:00.311,523] <inf> fw_info: ------- DEBUG BUILD -------
GW [00:00:00.311,523] <inf> fw_info: Compiled for GATEWAY device
GW [00:00:00.341,644] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 5.4 (0x0d), Revision 8699
GW [00:00:00.341,827] <inf> bt_mgmt: Local identity addr: C1:4B:5C:B4:E1:AF (random)
GW [00:00:00.341,949] <inf> audio_usb: Ready for USB host to send/receive.
GW [00:00:00.342,285] <inf> broadcast_source: Enabling broadcast_source NRF5340_BROADCASTER
GW [00:00:00.346,130] <inf> bt_mgmt_adv: Local addr: 39:01:2E:90:44:4B (random)
GW [00:00:00.348,205] <inf> main: Ext adv ready
GW [00:00:00.348,937] <inf> bt_mgmt_adv: Advertising successfully started
GW [00:00:00.356,628] <inf> broadcast_source: Broadcast source 0x2000d5ac started
GW [00:00:00.356,658] <inf> le_audio: LC3 codec config for source:
GW [00:00:00.356,658] <inf> le_audio:   Frequency: 48000 Hz
GW [00:00:00.356,658] <inf> le_audio:   Duration: 10000 us
GW [00:00:00.356,658] <inf> le_audio:   Channel allocation: 0x3
GW [00:00:00.356,689] <inf> le_audio:   Octets per frame: 120 (96000 bps)
GW [00:00:00.356,689] <inf> le_audio:   Frames per SDU: 1
GW [00:00:00.357,116] <inf> broadcast_source: Broadcast source 0x2000d5d4 started
GW [00:00:00.357,116] <inf> le_audio: LC3 codec config for source:
GW [00:00:00.357,147] <inf> le_audio:   Frequency: 48000 Hz
GW [00:00:00.357,147] <inf> le_audio:   Duration: 10000 us
GW [00:00:00.357,147] <inf> le_audio:   Channel allocation: 0x3
GW [00:00:00.357,147] <inf> le_audio:   Octets per frame: 120 (96000 bps)
GW [00:00:00.357,147] <inf> le_audio:   Frames per SDU: 1
GW [00:00:00.698,516] <inf> audio_usb: USB RX first data received.

Can please inform me if we need an intermediate "Broadcast Audio Assistant Device" for this Use-Case ?

[Amanda Hsieh]

Sorry for misunderstand the issue. 

No, The BIS gateway can function independently, broadcasting one or more audio streams from a source device to an unlimited number of receivers that are not connected to the source. See the test section in the Broadcast source sample.