bt_ascs: Failed to register ISO server -134

[Rafael Vidal]

Hi, we are developping a medical device that receives an audio stream from a smartphone. We have a custom board connected to a different DSP than the one in the nrf5340_audio_DK, so for us does not make sense to use the provided example files (on the contrary is creating quite confusion for us).

With a standard nrf5340_DK board, and a modified example unicast server we are getting error "*** Booting nRF Connect SDK v2.9.1-60d0d6c8d42d ***
*** Using Zephyr OS v3.7.99-ca954a6216c9 ***
[00:00:00.279,296] <wrn> bt_hci_core: opcode 0x203a status 0x01 
[00:00:00.279,327] <wrn> bt_hci_core: Controller does not support 'LE_READ_MAX_ADV_DATA_LEN'. Assuming maximum length is 31 bytes.
[00:00:00.282,135] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.282,165] <inf> bt_hci_core: HW Variant: nRF53x (0x0003)
[00:00:00.282,165] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 224.11902 Build 2231721665
[00:00:00.284,088] <inf> bt_hci_core: Identity: F6:5A:AE:C8:06:82 (random)
[00:00:00.284,088] <inf> bt_hci_core: HCI: version 5.4 (0x0d) revision 0x2077, manufacturer 0x0059
[00:00:00.284,118] <inf> bt_hci_core: LMP: version 5.4 (0x0d) subver 0x2077
Bluetooth initialized
[00:00:00.284,179] <err> bt_ascs: Failed to register ISO server -134
[00:00:00.284,637] <wrn> bt_hci_core: opcode 0x2036 status 0x01 
Failed to create adv set (err -5)"

We have created a folder \sysbuild\ and added a conf file for the CPUNET as explained on this same forum "/sysbuild/ipc_radio/overlay-bt_hci_ipc.conf" : 

CONFIG_CLOCK_CONTROL=y

CONFIG_CLOCK_CONTROL_NRF=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_BT=y

CONFIG_BT_EXT_ADV=y

this is our prj.conf:

#

# prj.conf — nRF5340 DK CPUAPP as LE Audio Unicast Server

#

# Bluetooth core

CONFIG_BT=y

CONFIG_BT_HCI=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_EXT_ADV=y

CONFIG_BT_DEVICE_NAME="INDESmed Audio Server"

#Hci core Problem migth be related to CLK???

CONFIG_CLOCK_CONTROL=y

CONFIG_CLOCK_CONTROL_NRF=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

# — BLE Audio roles y servicios

CONFIG_BT_AUDIO=y

CONFIG_BT_PAC_SNK=y

CONFIG_BT_ASCS=y

CONFIG_BT_BAP_UNICAST_SERVER=y

CONFIG_BT_CAP_ACCEPTOR=y

# LC3 y soporte interno

CONFIG_FPU=y

CONFIG_LIBLC3=y  

CONFIG_SW_CODEC_LC3_T2_SOFTWARE=y

CONFIG_BT_ISO_PERIPHERAL=y

CONFIG_BT_ISO_SYNC_RECEIVER=y

CONFIG_BT_ATT_PREPARE_COUNT=2

# Added large stack sizes. Can be optimized.

CONFIG_MAIN_STACK_SIZE=8192

CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_LC3_ENC_CHAN_MAX=2

CONFIG_LC3_DEC_CHAN_MAX=2

# Logging / RTT

CONFIG_PRINTK=y

CONFIG_LOG=y

thanks in advance for the support.

[Maria Gilje]

Hi Rafael, 

I will look into this, my first step will be to reproduce the error. Do you have and overview of the modifications made to the Unicast Audio Server sample?

Have you been able to make an unmodified sample run successfully? 

Best regards,

Maria

[Rafael Vidal]

Hi Maria,

thanks for the quick reply; I attach the modified unicast example file. We have tried to simplify as much as possible the code. On the main, we just call ble_audio_init(); and no, we have not been able to run the unicast server. I think the problem is related to configuration.

Fullscreen 5826.BLE-audio-connection.c Download

#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/audio/audio.h>
#include <zephyr/bluetooth/audio/bap.h>
#include <zephyr/bluetooth/audio/pacs.h>
#include <zephyr/bluetooth/hci.h>

/* ----------------------------------------
 * Globals
 * ---------------------------------------- */

static struct bt_conn                *default_conn;
static struct bt_bap_stream          sink_streams[CONFIG_BT_ASCS_MAX_ASE_SNK_COUNT];
static struct bt_le_ext_adv          *adv;

/* LC3 sink capability */
static const struct bt_audio_codec_cap lc3_cap = BT_AUDIO_CODEC_CAP_LC3(
    BT_AUDIO_CODEC_CAP_FREQ_ANY,
    BT_AUDIO_CODEC_CAP_DURATION_10,
    BT_AUDIO_CODEC_CAP_CHAN_COUNT_SUPPORT(1),
    40u, 120u, 1u,
    BT_AUDIO_CONTEXT_TYPE_CONVERSATIONAL |
    BT_AUDIO_CONTEXT_TYPE_MEDIA);

/* PACS sink registration */
static struct bt_pacs_cap cap_sink = {
    .codec_cap = &lc3_cap,
};


/* ------------------------------------------------------------------
 * Unicast-server registration parameters (posicional)
 * ------------------------------------------------------------------ */

static const struct bt_bap_unicast_server_register_param unicast_param = {
    CONFIG_BT_ASCS_MAX_ASE_SNK_COUNT, /* num_sink_ases */
    0                                 /* num_source_ases */
};


/* Advertising data */
static const struct bt_data ad[] = {
    BT_DATA_BYTES(BT_DATA_FLAGS,       BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR),
    BT_DATA_BYTES(BT_DATA_UUID16_ALL,  BT_UUID_16_ENCODE(BT_UUID_ASCS_VAL)),
    BT_DATA(BT_DATA_NAME_COMPLETE,
            CONFIG_BT_DEVICE_NAME,
            sizeof(CONFIG_BT_DEVICE_NAME) - 1),
};

/* ----------------------------------------
 * Connection callbacks
 * ---------------------------------------- */

static void connected(struct bt_conn *conn, uint8_t err)
{
    if (err || default_conn) {
        return;
    }
    default_conn = bt_conn_ref(conn);
    printk("[BLE] Conectado\n");
}

static void disconnected(struct bt_conn *conn, uint8_t reason)
{
    if (conn != default_conn) {
        return;
    }
    bt_conn_unref(default_conn);
    default_conn = NULL;
    printk("[BLE] Desconectado\n");
}

BT_CONN_CB_DEFINE(conn_callbacks) = {
    .connected    = connected,
    .disconnected = disconnected,
};

/* ----------------------------------------
 * Stream operations
 * ---------------------------------------- */

static void stream_started(struct bt_bap_stream *stream)
{
    printk("Stream iniciado %p\n", stream);
}

static void stream_stopped(struct bt_bap_stream *stream, uint8_t reason)
{
    printk("Stream detenido %p (0x%02x)\n", stream, reason);
}

static void stream_enabled(struct bt_bap_stream *stream)
{
    int err = bt_bap_stream_start(stream);
    if (err) {
        printk("Error al iniciar stream %p (%d)\n", stream, err);
    }
}

static void stream_recv(struct bt_bap_stream *stream,
                        const struct bt_iso_recv_info *info,
                        struct net_buf *buf)
{
    ARG_UNUSED(info);
    printk("Audio recibido: %u bytes\n", buf->len);
}

static struct bt_bap_stream_ops stream_ops = {
    .recv    = stream_recv,
    .started = stream_started,
    .stopped = stream_stopped,
    .enabled = stream_enabled,
};

/* ----------------------------------------
 * Unicast server callbacks
 * ---------------------------------------- */

static int cb_config(struct bt_conn *conn, const struct bt_bap_ep *ep,
                     enum bt_audio_dir dir,
                     const struct bt_audio_codec_cfg *cfg,
                     struct bt_bap_stream **stream,
                     struct bt_audio_codec_qos_pref *qos_pref,
                     struct bt_bap_ascs_rsp *rsp)
{
    printk("Config sink: conn %p ep %p dir %u\n", conn, ep, dir);

    /* Busca un sink libre */
    for (size_t i = 0; i < ARRAY_SIZE(sink_streams); i++) {
        if (!sink_streams[i].conn) {
            *stream = &sink_streams[i];
            break;
        }
    }
    if (!*stream) {
        *rsp = BT_BAP_ASCS_RSP(
            BT_BAP_ASCS_RSP_CODE_NO_MEM,
            BT_BAP_ASCS_REASON_NONE);
        return -ENOMEM;
    }

    /* QoS preferido */
    *qos_pref = (struct bt_audio_codec_qos_pref){
        .unframed_supported = false,
        .phy                = BT_GAP_LE_PHY_2M,
        .rtn                = 2,
        .latency            = 10,     /* ms */
        .pd_min             = 40000,  /* µs */
        .pd_max             = 40000,
        .pref_pd_min        = 40000,
        .pref_pd_max        = 40000,
    };

    return 0;
}

static const struct bt_bap_unicast_server_cb unicast_cb = {
    .config = cb_config,
};

/* ----------------------------------------
 * Initialization
 * ---------------------------------------- */

void ble_audio_init(void)
{
    int err;

    /* 1) BT on */
    err = bt_enable(NULL);
    if (err) {
        printk("Bluetooth init failed (err %d)\n", err);
        return;
    }
    printk("Bluetooth initialized\n");

    /* 2) PACS register */
    err = bt_pacs_cap_register(BT_AUDIO_DIR_SINK, &cap_sink);
    if (err) {
        printk("PACS register failed (err %d)\n", err);
        return;
    }

    /* 3) Stream callbacks */
    for (size_t i = 0; i < ARRAY_SIZE(sink_streams); i++) {
        bt_bap_stream_cb_register(&sink_streams[i], &stream_ops);
    }

    /* 4) Unicast server */
    bt_bap_unicast_server_register(&unicast_param);
    bt_bap_unicast_server_register_cb(&unicast_cb);

    /* 5) Extended advertising */
    err = bt_le_ext_adv_create(BT_LE_EXT_ADV_CONN, NULL, &adv);
    if (err) {
        printk("Failed to create adv set (err %d)\n", err);
        return;
    }

    err = bt_le_ext_adv_set_data(adv, ad, ARRAY_SIZE(ad), NULL, 0);
    if (err) {
        printk("Failed to set adv data (err %d)\n", err);
        return;
    }

    err = bt_le_ext_adv_start(adv, BT_LE_EXT_ADV_START_DEFAULT);
    if (err) {
        printk("Failed to start adv (err %d)\n", err);
    } else {
        printk("BLE Audio Unicast Server advertising\n");
    }
}

[Maria Gilje]

Thank you for sharing your modified sample. I have reproduced the error and I'm actively looking for an explanation and solution. 

Best regards,

Maria

[Maria Gilje]

Hi, 

I reproduced the error with the BAP unicast server sample and the default main.c, and I also noticed that the default network core image was HCI IPC with the Zephyr Controller. I was able to resolve the error with these additions: 

• Added a sysbuild.conf with SB_CONFIG_NETCORE_IPC_RADIO_BT_HCI_IPC=y
• Ensured that the IPC radio application was chosen by default by replacing the net core default image in Kconfig.sysbuild: 

  # config NET_CORE_IMAGE_HCI_IPC
  # 	bool "HCI IPC image on network core"
  # 	default y
  # 	depends on NET_CORE_BOARD != "" 
  
  config NRF_DEFAULT_IPC_RADIO 
  	default y
  	depends on NET_CORE_BOARD != ""

• Added two Kconfigs symbols to sysbuild/ipc_radio.conf
  

  CONFIG_BT_ISO_PERIPHERAL=y
  CONFIG_BT_MAX_CONN=4 # less than 16 at least, but tested with 4

I was not able to get any logging with your main.c, but let me know if my suggested modifications above causes any issues, and I'll try again to run your main.c. 

Best regards,

Maria