nRF52840 stop advertising

[Rajneesh]

Hello Everyone

I am working on nRF52840 DK, SDK V-15.0.

How we can stop advertising? Which API is used to stop advertising?

Quick help will be appreciated.

Regards

Raj

[Bjørn Kvaale]

Hi Raj,

Update: Take a look at the sd_ble_gap_adv_stop() function in the softdevice (ble_gap.h file). This devzone case could also be useful.

/**@brief Stop advertising (GAP Discoverable, Connectable modes, Broadcast Procedure).
 *
 * @mscs
 * @mmsc{@ref BLE_GAP_ADV_MSC}
 * @mmsc{@ref BLE_GAP_WL_SHARE_MSC}
 * @endmscs
 *
 * @param[in] adv_handle The advertising handle that should stop advertising.
 *
 * @retval ::NRF_SUCCESS The BLE stack has stopped advertising.
 * @retval ::BLE_ERROR_INVALID_ADV_HANDLE Invalid advertising handle.
 * @retval ::NRF_ERROR_INVALID_STATE The advertising handle is not advertising.
 */
SVCALL(SD_BLE_GAP_ADV_STOP, uint32_t, sd_ble_gap_adv_stop(uint8_t adv_handle));

Normally, you will advertise for 180 seconds & then advertising will turn off by itself until you press button 1 on the dev kit to turn it back on (works for most examples). See this line in main.c of the ble_app_uart peripheral example (or most other BLE examples):

#define APP_ADV_DURATION                18000                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

Also take a look at the ble_adv_modes_config_t struct in ble_advertising.h:

typedef struct
{
    bool     ble_adv_on_disconnect_disabled;     /**< Enable or disable automatic return to advertising upon disconnecting.*/
    bool     ble_adv_whitelist_enabled;          /**< Enable or disable use of the whitelist. */
    bool     ble_adv_directed_high_duty_enabled; /**< Enable or disable direct advertising mode. can only be used if ble_adv_legacy_enabled is true. */
    bool     ble_adv_directed_enabled;           /**< Enable or disable direct advertising mode. */
    bool     ble_adv_fast_enabled;               /**< Enable or disable fast advertising mode. */
    bool     ble_adv_slow_enabled;               /**< Enable or disable slow advertising mode. */
    uint32_t ble_adv_directed_interval;          /**< Advertising interval for directed advertising. */
    uint32_t ble_adv_directed_timeout;           /**< Time-out (number of tries) for direct advertising. */
    uint32_t ble_adv_fast_interval;              /**< Advertising interval for fast advertising. */
    uint32_t ble_adv_fast_timeout;               /**< Time-out (in seconds) for fast advertising. */
    uint32_t ble_adv_slow_interval;              /**< Advertising interval for slow advertising. */
    uint32_t ble_adv_slow_timeout;               /**< Time-out (in seconds) for slow advertising. */
    bool     ble_adv_extended_enabled;           /**< Enable or disable extended advertising. */
    uint32_t ble_adv_secondary_phy;              /**< PHY for the secondary (extended) advertising @ref BLE_GAP_PHYS (BLE_GAP_PHY_1MBPS, BLE_GAP_PHY_2MBPS or BLE_GAP_PHY_CODED). */
    uint32_t ble_adv_primary_phy;                /**< PHY for the primary advertising. @ref BLE_GAP_PHYS (BLE_GAP_PHY_1MBPS, BLE_GAP_PHY_2MBPS or BLE_GAP_PHY_CODED). */
} ble_adv_modes_config_t;

There, you can see a timeout for fast advertising & slow advertising (you will only need to worry about fast advertising most likely). The advertising timeout is set in advertising_init().

Kind Regards,

Bjørn

[awneil]

So there's no way to stop advertising once it's started?

You just have to wait for it to time-out?

[Bjørn Kvaale]

I have updated the post. My bad for misreading the question.

[Rajneesh]

Hi Bjørn Could you please tell me how to disable softdevice for nRF52840 device? I tried with following APIs to disable softdevice but it's not working:

1. nrf_sdh_disable_request()
2. sd_softdevice_disable();

Thanks