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BLE_Audio_PBP_Sink Auracast Receiver Not Visible on Mobile main task

jeevanmv1998
Associate

‎2025-09-01 2:26 AM - last edited on ‎2025-09-01 2:58 AM by

stm32wba55g-dk1

Subject: Support Required – BLE_Audio_PBP_Sink Auracast Receiver Not Visible on Mobile

Hi Team,

I am currently working on the Auracast project using the STM32WBA55G-DK1 board.
In this setup, the board is configured as the receiver side (Sink). After building and flashing, the board is expected to appear as AURACAST SINK STM32Auracast1, 2, 3, etc.

The project code location I am using is:

/home/engineer/Music/STM32CubeWBA/Projects/STM32WBA55G-DK1/Applications/BLE/BLE_Audio_PBP_Sink

I have also tested with the following smartphones that support BLE Audio / Auracast:  but not able to  see device  information related  to receiver  side device  in phone

  • Google Pixel: Pixel 7 / 7 Pro, Pixel 8 / 8 Pro, Pixel 9 / 9 Pro / 9 Pro XL / 9 Pro Fold

  • OnePlus: OnePlus 11, 12, 13

Issue Observed

  • After building and flashing the board, I am not able to see or connect to the advertising device from the mobile phone.

  • Verified with different Android versions and Bluetooth versions.

  • Enabled BLE Audio Auracast configuration in phone settings.

  • Despite this, the board does not appear in scanning.

Logs Captured

Below are the logs observed after flashing:

==>> Start Ble_Hci_Gap_Gatt_Init function
  Success: aci_hal_write_config_data command - CONFIG_DATA_PUBADDR_OFFSET
  Public Bluetooth Address: 00:80:e1:2a:b4:8a
  Success: aci_hal_write_config_data command - CONFIG_DATA_IR_OFFSET
  Success: aci_hal_write_config_data command - CONFIG_DATA_ER_OFFSET
  Success: aci_hal_set_tx_power_level command
  Success: aci_gatt_init command
  Success: aci_gap_init command
  Fail   : aci_gatt_update_char_value - Device Name, result: 0x60
  Fail   : aci_gatt_update_char_value - Appearance, result: 0x60
  Success: hci_le_set_default_phy command
  Success: aci_gap_set_io_capability command
  Success: aci_gap_set_authentication_requirement command
==>> End Ble_Hci_Gap_Gatt_Init function
BLE_AUDIO_STACK_Init() returns status 0x00
BLE Audio Stack Lib version: v1.11_FULL_Official
>>==  Start CAP Acceptor initialization
  Success: CAP_Init() function
  Success: PBPAPP_Init() function
  Success: CAP_EnableAudioCodecController() function
  Success: PBP_Init() function
>>==  End CAP Acceptor initialization
>>==  Start Sink
  Success: PBP_PBK_StartAdvReportParsing() function
  Success: aci_gap_ext_start_scan() function with Scan procedure 0x80
>>==  Start Switch Broadcast Source
>>==  End Switch Broadcast Source

Request

Could you please help confirm:

  1. If any code modifications are required to enable advertising/discovery?

  2. Whether any configuration changes are needed on the STM32WBA55G board for Auracast Sink visibility?

  3. If there are additional flags or features that need to be enabled in the project configuration?

Your guidance on resolving this issue will be very helpful.

Thanks & Regards,
Jeevan MV

:backhand_index_pointing_right:Would you like me to also make a shorter version of this mail (more concise, just highlighting issue + request), so you can send it quickly if needed?

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1 REPLY 1
TPITEL
ST Employee

‎2025-09-01 6:25 AM

Hello Jeevan,

The BLE_Audio_PBP_Sink only implements the Broadcast Sink role and therefore only perform scanning to find and synchronize remote Broadcast Source. It doesn't advertise, so it will not be visible on a smartphone scanning. It's designed to automatically synchronize to a Broadcast Source with the name in aSourceList (by default it will try to synchronize to "STM32Auracast_1"). If you're able to setup a Broadcast Source with this name on your smartphone, it should synchronize to it.

If you want your STM32WBA-DK to act as a Scan Delegator to advertise and accept connection from a smartphone acting as Broadcast Assistant, you can use the BLE_Audio_TMAP_Peripheral application, which permits to start advertising as Scan Delegator from the startup menu. You should then be able to see it on a Bluetooth scan from the smartphone. You can refer to our wiki pages for more details about our BLE Audio apps:

- https://wiki.st.com/stm32mcu/wiki/Connectivity:Introduction_to_Bluetooth_LE_Audio

- https://wiki.st.com/stm32mcu/wiki/Connectivity:Bluetooth_LE_Audio_-_STM32WBA_Public_Broadcast_Profile

- https://wiki.st.com/stm32mcu/wiki/Connectivity:Bluetooth_LE_Audio_-_STM32WBA_Telephony_%26_Media_Audio_Profile

Please let me know if you need additional info.

Best Regards,

Tom.

 

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