nRF5340_audio not able to bond with android

[MalikRehan_05]

Hello,
I'm trying to get nrf5340_audio example running on nrf5340 audio dk.

I'm able to build the code and run it however i'm unable to bond with my mobile phone with android 15

I'm using nrf connect sdk version 2.9.1

Using below command to build the application

west build -b nrf5340_audio_dk/nrf5340/cpuapp --pristine -DCONFIG_AUDIO_DEV=1

Attaching logs below

** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***
HL [00:00:00.268,737] <inf> board_version: Compatible board/HW version found: 10
HL [00:00:00.301,391] <inf> fw_info:
nRF5340 Audio nRF5340 Audio DK cpuapp
NCS base version: 2.9.1
Cmake run : Thu Mar 20 16:55:36 2025
HL [00:00:00.301,391] <inf> fw_info: ------- DEBUG BUILD -------
HL [00:00:00.301,391] <inf> fw_info: HEADSET left device
HL [00:00:00.368,865] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 66
HL [00:00:00.369,079] <inf> bt_mgmt: Local identity addr: F8:BE:A1:CD:EE:E6 (ra)
HL [00:00:00.399,505] <inf> bt_mgmt_scan: Local addr: F8:BE:A1:CD:EE:E6 (randomd
HL [00:00:00.399,505] <inf> bt_mgmt_scan: Scanning successfully started
*** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***
HL [00:00:00.376,617] <inf> board_version: Compatible board/HW version found: 10
HL [00:00:00.409,301] <inf> fw_info:
nRF5340 Audio nRF5340 Audio DK cpuapp
NCS base version: 2.9.1
Cmake run : Thu Mar 20 18:27:28 2025
HL [00:00:00.409,301] <inf> fw_info: ------- DEBUG BUILD -------
HL [00:00:00.409,301] <inf> fw_info: HEADSET left device
HL [00:00:00.482,971] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 66
HL [00:00:00.483,184] <inf> bt_mgmt: Local identity addr: CB:BB:A6:23:7B:20 (ra)
HL [00:00:00.512,084] <wrn> unicast_server: CSIP using the default SIRK, must bn
HL [00:00:00.515,838] <inf> bt_mgmt_adv: Local addr: 5F:85:78:D3:E0:D9 (random)
HL [00:00:00.516,357] <inf> bt_mgmt_adv: Advertising successfully started
HL [00:00:38.042,419] <inf> bt_mgmt: Connected: 46:E7:86:BF:E5:1D (random)
HL [00:00:38.042,449] <inf> main: Connection event. Num connections: 1
HL [00:01:21.386,779] <inf> bt_mgmt: Disconnected: 46:E7:86:BF:E5:1D (random),
HL [00:01:21.386,810] <inf> main: Disconnection event. Num connections: 0
HL [00:01:21.386,810] <wrn> bt_content_ctrl_media: Unable to look up conn point3
HL [00:01:21.387,695] <inf> bt_mgmt_adv: Local addr: 5F:85:78:D3:E0:D9 (random)
HL [00:01:21.388,214] <inf> bt_mgmt_adv: Advertising successfully started
HL [00:01:28.542,236] <inf> bt_mgmt: Connected: 46:E7:86:BF:E5:1D (random)
HL [00:01:28.542,266] <inf> main: Connection event. Num connections: 1
HL [00:01:30.927,185] <inf> main: Security changed
HL [00:01:33.207,153] <inf> bt_content_ctrl_media: Discovery of MCS finished
HL [00:02:12.233,978] <err> bt_content_ctrl_media: Invalid state: 0
HL [00:02:12.234,008] <wrn> bt_content_ctrl: Failed to change the streaming stae
HL [00:02:12.234,008] <wrn> main: Could not start: -140
HL [00:02:14.056,488] <err> bt_content_ctrl_media: Invalid state: 0
HL [00:02:14.056,488] <wrn> bt_content_ctrl: Failed to change the streaming stae
HL [00:02:14.056,488] <wrn> main: Could not start: -140
HL [00:00:01.838,623] <inf> bt_mgmt: Directed adv timed out with no connection,v
HL [00:00:01.841,979] <inf> bt_mgmt_adv: Local addr: 50:1E:3D:72:F7:D6 (random)
HL [00:00:01.842,498] <inf> bt_mgmt_adv: Advertising successfully started

[dejans]

Hi,

Can you provide details about you test setup and testing procedure?

Have you made any changes to audio application?

Which Android phone do you use?

Best regards,
Dejan

[MalikRehan_05]

Hello Dejan,

I'm building the nrf5340_audio app as is for my nRF5340_audio dk, 
Goal is to connect it to a phone and to be able to use nRF5340_audio dk as headset.

I haven't made any changes to the application

I have used this command to build the application
west build -b nrf5340_audio_dk/nrf5340/cpuapp --pristine -DCONFIG_AUDIO_DEV=1

I'm using OnePlus Nord CE4 for testing 

[dejans]

Hi,

Which Android version does your phone have?

Best regards,
Dejan

[MalikRehan_05]

Hello,
My phone has Android 15

Regards

[dejans]

Hi,

Have you checked that your phone supports LE Audio?

Best regards,
Dejan

[MalikRehan_05]

Hi Dejan,
The specifications say it has Bluetooth 5.4 and supports SBC/AAC/aptX
HD/aptX/LDAC/LHDC

[dejans]

Hi,

Does your phone have the latest updates?

You can try to clear bonds on the audio-dk (by holding button 5 while resetting), forget the device on the phone and toggle Bluetooth.

It is unexpected that there is early problem when headset connects, disconnects and connects again. It could be that the phone is not fully ready which causes connect/disconnect loop. You could try to add following config to your project configuration file

CONFIG_BT_BAP_UNICAST_SERVER_LOG_LEVEL_DBG=y
CONFIG_UNICAST_SERVER_LOG_LEVEL_DBG=y

and provide new log. Furthermore, if you have sniffer, you could try to capture sniffer log which could provide additional information. 

Best regards,
Dejan

[MalikRehan_05]

Hi,

I built the application by adding the flags you mentioned, also cleared the bonds.

After this I'm able to pair with the device and as well connect to it using nRF Connect app
However i don't see it being connected as headphone on my mobile

Logs from device: 

*** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***                             
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***                                    
HL [00:00:00.268,890] <inf> board_version: Compatible board/HW version found: 10
HL [00:00:00.301,544] <inf> fw_info:                                            
         nRF5340 Audio nRF5340 Audio DK cpuapp                                  
         NCS base version: 2.9.1                                                
         Cmake run : Mon Mar 24 15:18:35 2025                                   
HL [00:00:00.301,544] <inf> fw_info: ------- DEBUG BUILD -------                
HL [00:00:00.301,574] <inf> fw_info: HEADSET left device                        
HL [00:00:00.375,427] <inf> bt_mgmt: Clearing all bonds                         
HL [00:00:00.378,601] <inf> bt_mgmt_ctlr_cfg: Controller: SoftDevice: Version 66
HL [00:00:00.378,814] <inf> bt_mgmt: Local identity addr: CB:BB:A6:23:7B:20 (ra)
HL [00:00:00.407,653] <wrn> unicast_server: CSIP using the default SIRK, must bn
HL [00:00:00.411,376] <inf> bt_mgmt_adv: Local addr: 7E:13:03:A1:A0:D7 (random) 
HL [00:00:00.411,865] <inf> bt_mgmt_adv: Advertising successfully started       
HL [00:00:05.200,042] <inf> bt_vol_rend: Volume = 195, mute state = 1           
HL [00:00:24.455,413] <inf> bt_mgmt: Connected: 40:6B:55:BA:2A:C0 (random)      
HL [00:00:24.455,444] <inf> main: Connection event. Num connections: 1          
HL [00:00:55.737,365] <inf> bt_mgmt: Disconnected: 40:6B:55:BA:2A:C0 (random),  
HL [00:00:55.737,396] <inf> main: Disconnection event. Num connections: 0       
HL [00:00:55.737,426] <wrn> bt_content_ctrl_media: Unable to look up conn point3
HL [00:00:55.738,311] <inf> bt_mgmt_adv: Local addr: 7E:13:03:A1:A0:D7 (random) 
HL [00:00:55.738,830] <inf> bt_mgmt_adv: Advertising successfully started       
HL [00:01:07.733,032] <inf> bt_mgmt: Connected: 40:6B:55:BA:2A:C0 (random)      
HL [00:01:07.733,062] <inf> main: Connection event. Num connections: 1          
HL [00:01:11.248,046] <inf> main: Security changed                              
HL [00:01:13.617,889] <inf> bt_content_ctrl_media: Discovery of MCS finished  

Logs from nRF Connect:

nRF Connect, 2025-03-24
NRF5340_AUDIO (7E:13:03:A1:A0:D7)
V	15:37:13.412	Connecting to 7E:13:03:A1:A0:D7...
D	15:37:13.412	gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D	15:37:13.435	[Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I	15:37:13.435	Connected to 7E:13:03:A1:A0:D7
D	15:37:13.435	wait(1600ms)
V	15:37:15.037	Discovering services...
D	15:37:15.037	gatt.discoverServices()
D	15:37:15.050	[Callback] Services discovered with status: 0
I	15:37:15.050	Services discovered
V	15:37:15.065	Generic Attribute (0x1801)
Service Changed [I] (0x2A05)
   Client Characteristic Configuration (0x2902)
Client Supported Features [R W] (0x2B29)
Database Hash [R] (0x2B2A)
Generic Access (0x1800)
Device Name [R W] (0x2A00)
Appearance [R] (0x2A01)
Published Audio Capabilities Service (0x1850)
Sink PAC [R] (0x2BC9)
   Client Characteristic Configuration (0x2902)
Sink Audio Locations [R] (0x2BCA)
Source PAC [R] (0x2BCB)
   Client Characteristic Configuration (0x2902)
Source Audio Locations [R] (0x2BCC)
Available Audio Contexts [N R] (0x2BCD)
   Client Characteristic Configuration (0x2902)
Supported Audio Contexts [R] (0x2BCE)
Audio Stream Control Service (0x184E)
ASE Control Point [N W WNR] (0x2BC6)
   Client Characteristic Configuration (0x2902)
Sink ASE [N R] (0x2BC4)
   Client Characteristic Configuration (0x2902)
Coordinated Set Identification Service (0x1846)
Set Identity Resolving Key Characteristic [R] (0x2B84)
Size Characteristic [N R] (0x2B85)
   Client Characteristic Configuration (0x2902)
Lock Characteristic [N R W] (0x2B86)
   Client Characteristic Configuration (0x2902)
Rank Characteristic [R] (0x2B87)
Common Audio Service (0x1853)
Volume Control (0x1844)
Volume State [N R] (0x2B7D)
   Client Characteristic Configuration (0x2902)
Volume Control Point [W] (0x2B7E)
Volume Flags [R] (0x2B7F)
D	15:37:15.065	gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true)
D	15:37:15.069	gatt.setCharacteristicNotification(00002bcd-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.072	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
D	15:37:15.073	gatt.setCharacteristicNotification(00002bc6-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.076	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
D	15:37:15.077	gatt.setCharacteristicNotification(00002bc4-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.080	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
D	15:37:15.080	gatt.setCharacteristicNotification(00002b85-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.082	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
D	15:37:15.082	gatt.setCharacteristicNotification(00002b86-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.084	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
D	15:37:15.084	gatt.setCharacteristicNotification(00002b7d-0000-1000-8000-00805f9b34fb, true)
E	15:37:15.086	Exception occurred (Need BLUETOOTH PRIVILEGED permission: Neither user 10132 nor current process has android.permission.BLUETOOTH_PRIVILEGED.)
I	15:37:22.393	PHY updated (TX: LE 2M, RX: LE 1M)

[dejans]

Hi,

In the nRF Connect application, you could try to press on "Device Information". You should then be able to see (under Bluetooth Audio) if the phone supports LE Audio. Can you check this?

Best regards,
Dejan

[MalikRehan_05]

Hi,

It shows it support LE audio, attaching screenshot

Regards

[dejans]

Hi,

Is your previously provided log file from audio-dk taken when connecting audio-dk to the mobile phone?

Best regards,
Dejan

[MalikRehan_05]

Hi,

Ye previously provided logs are collected when i tried to pair the device with the audio dk

Regards