bt_adv: Controller cannot resume connectable advertising

[Mariano]

After update to SDK 2.4.0 I'm seeing this error:

 [00:01:37.116,943] <inf> ble_nus: Central Disconnected: 70:23:B7:FE:65:27 (random) (reason 8)
00> [00:01:37.117,309] <wrn> bt_hci_core: opcode 0x2005 status 0x0c
00> [00:01:37.117,340] <err> bt_adv: Controller cannot resume connectable advertising (-5)

After the error advertising does not resume any more and I have to reset the device. I didn't see this problem using the sdk 2.1.1 for the same code.

I am utilizing both the central and peripheral roles in my project. The issue arises when the central device (my phone) disconnects from the board (which is acting as the peripheral role) due to being out of range. However, I haven't encountered the same problem when manually connecting and disconnecting the devices (reason 9). Here is the configuration for my project:

CONFIG_PM=y

CONFIG_PM_DEVICE=y

CONFIG_PINCTRL=y

CONFIG_EVENTS=y

# Enable the UART driver

#CONFIG_UART_ASYNC_API=y

CONFIG_NRFX_UARTE0=y

CONFIG_SERIAL=y

CONFIG_UART_INTERRUPT_DRIVEN=y

CONFIG_CONSOLE=y

#CONFIG_UART_CONSOLE=y

CONFIG_USE_SEGGER_RTT=y

CONFIG_RTT_CONSOLE=y

#fpu

CONFIG_FPU=y

CONFIG_NEWLIB_LIBC=y

CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

# Enable the BLE stack with GATT Client configuration

CONFIG_BT=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_CENTRAL=y

CONFIG_BT_SMP=y

CONFIG_BT_GATT_CLIENT=y

CONFIG_BT_PRIVACY=n

CONFIG_BT_MAX_CONN=20

CONFIG_BT_MAX_PAIRED=20

CONFIG_BT_DEVICE_NAME="CB"

CONFIG_BT_DEVICE_APPEARANCE=832

CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT=1

# Enable the BLE modules from NCS

CONFIG_BT_NUS_CLIENT=y

CONFIG_BT_NUS=y

CONFIG_BT_SCAN=y

CONFIG_BT_SCAN_FILTER_ENABLE=y

CONFIG_BT_SCAN_UUID_CNT=1

CONFIG_BT_GATT_DM=y

CONFIG_HEAP_MEM_POOL_SIZE=8096

# This example requires more workqueue stack

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=3072

CONFIG_MAIN_STACK_SIZE=5120

#memory

CONFIG_STDOUT_CONSOLE=y

CONFIG_SPI=y

CONFIG_NORDIC_QSPI_NOR=y

# Enable bonding

CONFIG_BT_SETTINGS=y

CONFIG_FLASH=y

CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FLASH_MAP=y

CONFIG_NVS=y

CONFIG_SETTINGS=y

# Enable ADC

CONFIG_ADC=y

CONFIG_MODULE_BATTERY=y

# Config logger

CONFIG_LOG=y

CONFIG_USE_SEGGER_RTT=y

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_BACKEND_UART=n

CONFIG_GPIO_AS_PINRESET=y

CONFIG_ASSERT=y

#FIRMWARE config

CONFIG_APP_WAIT_REQUEST=y

CONFIG_APP_DISABLE_LTE_AUTOMATIC_SWITCH=y

CONFIG_BT_USER_DATA_LEN_UPDATE=y

CONFIG_BT_USER_PHY_UPDATE=y

CONFIG_BT_BUF_ACL_RX_SIZE=251

CONFIG_BT_ATT_PREPARE_COUNT=2

CONFIG_BT_L2CAP_TX_MTU=247

CONFIG_BT_BUF_ACL_TX_COUNT=10

CONFIG_BT_BUF_ACL_TX_SIZE=251

CONFIG_BT_CTLR_PRIVACY=n

CONFIG_NFCT_PINS_AS_GPIOS=y

CONFIG_PWM=y

Could you help me to understand what is happening?

[Hung Bui]

Hi Mariano, 

Could you show us how you re-start advertising ?
Could you try disable scanning when  you disconnect and see the issue persist  ?

How many connections do you have when you disconnect ? 
Instead of bringing the central out of range, if you simply turn off Bluetooth on the phone, do you see the same problem ? 

[Mariano]

Hi Hung Bui !

Should I restart advertising? Shouldn't it happen automatically? I didn't observe it in the peer example.

I'm currently initiating the advertising process during initialization. I will try your suggestion and I will be back with the results.

void ble_peer_nus_init(void)

{

    if (IS_ENABLED(CONFIG_BT_NUS_SECURITY_ENABLED))

    {

        bt_conn_auth_cb_register(&conn_auth_callbacks);

    }

    int err = bt_nus_init(&nus_cb);

    if (err)

    {

        LOG_ERR("Failed to initialize UART service (err: %d)", err);

        return;

    }

    err = bt_le_adv_start(BT_LE_ADV_CONN, ad, ARRAY_SIZE(ad), sd,

                          ARRAY_SIZE(sd));

    if (err)

    {

        LOG_ERR("Advertising failed to start (err %d)", err);

        return;

    }

}

void bluetooth_ready(int err)

{

    if (err)

    {

        LOG_ERR("Bluetooth init error %d", err);

        return;

    }

    LOG_INF("Bluetooth initialized");

   

    if (IS_ENABLED(CONFIG_SETTINGS))

    {

        settings_load();

    }

    ble_peer_nus_init();

    bt_nus_multi_setup();

    scan_init();

}

From main:

    err = bt_enable(bluetooth_ready);

    if (err)

    {

        LOG_ERR("Bluetooth init failed (err %d)", err);

        return;

    }

[Hung Bui]

Hi Mariano, 

Sorry I thought you were using BT_LE_ADV_OPT_ONE_TIME and would require to restart advertising manually. 

Please let me know if you still see the issue if you don't scan. 
I suspect it may have something to do with this: https://github.com/zephyrproject-rtos/zephyr/issues/13629

It's the same error 0x0C. 

[Mariano]

Hi Hung Bui , thank you for your help. What you proposed have worked, despite is not the most beautiful solution. Best regards,

Mariano