I want to resolve errors at the start of BLE advertising

[MakotoKoike]

An error occurs when you run the following program(main.c).

[1;33m<wrn> bt_hci_core: opcode 0x2006 status 0x01
[1;31m<err> LOG_MODULE_NAME: Advertising start (err -5)

What could be the cause?

void main(void)
{
int err;

err = bt_enable(NULL);
if (err) {
LOG_ERR("Bluetooth init failed (err %d)\n", err);
return;
}

LOG_INF("Bluetooth initialized\n");

if (IS_ENABLED(CONFIG_SETTINGS)) {
settings_load();
}

err = bt_le_adv_stop();
if (err) {
LOG_ERR("Advertising stop (err %d)\n", err);
return;
}
err = bt_le_adv_start(ADV_PARAM, ad, ARRAY_SIZE(ad), NULL, 0);
if (err) {
LOG_ERR("Advertising start (err %d)\n", err);
return;
}
}

prj.conf

CONFIG_BT=y
CONFIG_BT_DEBUG_LOG=y
#CONFIG_BT_H4=y
#CONFIG_BT_WAIT_NOP=y
#CONFIG_BT_CENTRAL=y
CONFIG_BT_L2CAP_TX_BUF_COUNT=5
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Nordic_DEV"
CONFIG_BT_MAX_CONN=2
CONFIG_BT_MAX_PAIRED=2
CONFIG_BT_SMP=y
CONFIG_BT_TINYCRYPT_ECC=y
CONFIG_BT_PRIVACY=y
CONFIG_BT_SCAN_WITHIDENTITY=y
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_GATT_DM=y

CONFIG_BT_COMM_CTX=y

# Enable the BLE modules from NCS
CONFIG_BT_NUS_CLIENT=y
CONFIG_BT_SCAN=y
CONFIG_BT_SCAN_FILTER_ENABLE=y
CONFIG_BT_SCAN_UUID_CNT=1
# CONFIG_BT_SCAN_ADDRESS_CNT=1
CONFIG_BT_GATT_DM=y
CONFIG_HEAP_MEM_POOL_SIZE=2048

CONFIG_BT_OBSERVER=y

# This example requires more workqueue stack
CONFIG_MAIN_STACK_SIZE=8192
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

# Enable bonding
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_SETTINGS=y

# Config logger
CONFIG_LOG=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LOG_BACKEND_UART=n

CONFIG_ASSERT=y

CONFIG_USE_SEGGER_RTT=y
CONFIG_UART_CONSOLE=n
CONFIG_RTT_CONSOLE=y

CONFIG_BT_LL_SOFTDEVICE_DEFAULT=y
CONFIG_BT_CTLR=y

#CONFIG_UART_2_NRF_UARTE=y
#CONFIG_UART_2_NRF_FLOW_CONTROL=y
#CONFIG_UART_INTERRUPT_DRIVEN=y

#CONFIG_BSD_LIBRARY_TRACE_ENABLED=n

CONFIG_BT_DEBUG_HCI_DRIVER=y
CONFIG_BT_HCI=y
CONFIG_BT_RPMSG=y

[MakotoKoike]

I get the following error when I start advertising.

<err> bt_hci_core: Too big advertising data
<err> LOG_MODULE_NAME: Advertising start (err -22)

The advertisement data is as follows, and the length is 31 bytes.

static struct bt_data ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_NO_BREDR),
BT_DATA_BYTES(BT_DATA_FLAGS, 0x1A),
BT_DATA_BYTES(BT_DATA_UUID16_ALL,0x6f, 0xfd),
BT_DATA_BYTES(BT_DATA_SVC_DATA16,0x6f, 0xfd, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, 16,17,18,19),
};

When I looked it up,
An error has occurred in the set_data_add function in \v1.4.1\zephyr\subsys\bluetooth\host\hci_core.c.

if ((set_data_len + len + 2)> set_data_len_max)
It seems that the len of is doubled.

How about that?

[Carl Richard]

Hi again!

Have you accounted for the message overhead? As explained in this thread you are limited to a maximum user payload of 29 bytes.

Best regards,
Carl Richard

[MakotoKoike]

Thank you for answering.

I was counting overhead, but it was because the FLAGS designation was two lines.

The advertisement data is as follows, and the length including overhead is 31 bytes.

static struct bt_data ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, 0x1A),
BT_DATA_BYTES(BT_DATA_UUID16_ALL,0x6f, 0xfd),
BT_DATA_BYTES(BT_DATA_SVC_DATA16,0x6f, 0xfd, 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15, 16,17,18,19),
};

[Carl Richard]

I see. That makes sense! 

So it's working now?

Best regards,
Carl Richard