Could not create unicast group (err -134)

[mul]

I am trying the Zephry Bluetooth samples unicast_audio_server and unicast_audio_client at 

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/bluetooth/unicast_audio_server and 

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/bluetooth/unicast_audio_client 

On the client side when the client connects to the server, it fails to create a unicast group with error -134 on calling bt_audio_unicast_group_create()

The terminal out of the clint program is below. What could be causing this? Thanks in advance. 

[AD]: 1 data_len 1
[AD]: 3 data_len 2
Audio server found; connecting
MTU exchanged: 23/23
Connected: F4:5D:59:89:91:45 (random)
MTU exchanged: 65/65
Connected
Discovering sinks
#0: codec_capabilities 0x2000324c dir 0x01
codec 0x06 cid 0x0000 vid 0x0000 count 5
data #0: type 0x01 len 2
f5
data #1: type 0x02 len 1data #2: type 0x03 len 1data #3: type 0x04 len 4
280078
data #4: type 0x05 len 1meta #0: type 0x01 len 2
06
dir 1 loc 4
snk ctx 31 src ctx 15
Sink #0: ep 0x20003070
Sink #1: ep 0x2000315c
Discover sinks complete: err 0
Sinks discovered
Discovering sources
#0: codec_capabilities 0x200032b4 dir 0x02
codec 0x06 cid 0x0000 vid 0x0000 count 5
data #0: type 0x01 len 2
f5
data #1: type 0x02 len 1data #2: type 0x03 len 1data #3: type 0x04 len 4
280078
data #4: type 0x05 len 1meta #0: type 0x01 len 2
06
dir 2 loc 3
snk ctx 31 src ctx 15
Sink #0: ep 0x20002e98
Discover sources complete: err 0
Sources discovered
Configuring streams
Audio Stream 0x20002064 configured
Configured sink stream[0]
Audio Stream 0x20002088 configured
Configured sink stream[1]
Audio Stream 0x200020ac configured
Configured source stream[0]
Stream configured
Creating unicast group
Could not create unicast group (err -134)
[00:01:27.483,917] <err> bt_audio_stream: bt_audio_cig_create: bt_iso_cig_create failed: -134

[Karl Ylvisaker]

Hello,

Which controller are you using, the Zephyr Controller or the SoftDevice controller?

The SoftDevice controller does not support ISO channels, so you will have to use the Zephyr controller to test these samples. The -134 error code means Unsupported Value, and would be returned if you were using the SoftDevice controller, for instance.

Best regards,
Karl

[mul]

 Karl Ylvisaker Thanks for your reply. I am using the Zephyr controller ( I believe ). I build the following sample and flash it to the network core.

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/bluetooth/hci_rpmsg/README.html

My proj.conf for the hci_rpmsg sample is as follows : 

CONFIG_IPC_SERVICE=y
CONFIG_MBOX=y

CONFIG_HEAP_MEM_POOL_SIZE=8192

CONFIG_MAIN_STACK_SIZE=512
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512

CONFIG_BT=y
CONFIG_BT_HCI_RAW=y
CONFIG_BT_HCI_RAW_RESERVE=1
CONFIG_BT_MAX_CONN=16

CONFIG_BT_CTLR_ASSERT_HANDLER=y

# Workaround: Unable to allocate command buffer when using K_NO_WAIT since
# Host number of completed commands does not follow normal flow control.
CONFIG_BT_BUF_CMD_TX_COUNT=10

CONFIG_BT_EXT_ADV=y
CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_PER_ADV=y

[Karl Ylvisaker]

Hello,

By default the NCS SDK samples will use the SoftDevice Controller, unless you have the CONFIG_BT_LL_SW_SPLIT config in your prj.config file.
I dont see this in your shared prj.conf file, so I would assume that you are also using the SoftDevice Controller.
Please try to add the CONFIG_BT_LL_SW_SPLIT config to switch to the Zephyr LL Controller, and see if this issue persists.

Best regards,
Karl

[mul]

Hi Karl Ylvisaker 

When I add CONFIG_BT_LL_SW_SPLIT=y to the proj.conf of the hci_rpmsg sample and flash the network core with it, then the server can't even create an advertising set. With this disabled, it can create an advertising set, but then the client is unable to create  a unicast group.  

*** Booting Zephyr OS build v3.2.99-ncs1 ***
Bluetooth initialized
Location successfully set
Available contexts successfully set
Failed to create advertising set (err -5)

[Maria Gilje]

Hello,

I am taking over this case from Karl. I can look closer into it over the weekend, but I have some initial thoughts.

I can see that you are linking to both Zephyr and NCS documentation, and I want to clear up which SDK you are using.

Are you using Zephyr from Zephyr Project or the Zephyr samples from nRF Connect SDK? NCS uses a downstream version of Zephyr, and the different version could be a factor for your error.

Kind Regards,
Maria