Restart the advertising

[GK]

Dear Sir,

I want to do the following scenario.

Once I power the device it will start advertising.

Now the advertising duration is 2minutes.

I have written a routine based on timer. When it is called it should initiate the advertising again.

How can I  restart an advertising sequence once a current advertising going on?.

I tried the following sequence

(void) sd_ble_gap_adv_stop(&m_advertising.adv_handle);
advertising_start(erase_bonds);

But it shows the error

 WakeUp
<error> app: ERROR 8 [NRF_ERROR_INVALID_STATE] at I:\GK\Rigado\sdk\nRF5_SDK_15.0.0_a53641a\examples\ble_peripheral\Sieva_prod1_wologs\main.c:1325

What am I missing in restarting advertising routine?

In function "ble_advertising_restart_without_whitelist()", I think it follows the same sequence.

But I dont know why it is not working for me.

Please shed some light on this.

with regards,

Geetha

[AndreasF]

Hi.

The error code is most likely because when you try to stop advertising, you're not advertising. Look at this question for more information about NRF_ERROR_INVALID_STATE and advertising.

The proper way to start/stop would be:

//Stop
err_code = sd_ble_gap_adv_stop(m_adv_handle);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("Stopping advertising");
        
//Start        
err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("Starting advertising");

Look at this question, there is an attached .zip file containing a modified beacon example, where start/stop advertising is implemented as a handle of pressing button 1 (in void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action))

- Andreas

[GK]

Hi,

Thank you very much for your response.

My scenario is as follows.

I am using 2 timers.

First timer will wake up for each 5 mins and second one wake up after the first 1 minute.

So when I start the device , it advertises. And initial 1 minute I will do a connect-disconnect method to get the adddresses.

Now once I disconnect the device it will start advertising since the function "ble_advertising_start()"  is getting called inside "on_disconnected()" function.

If I want to stop advertising from the main.c file  how can I do this?..

how can I get the advertising handle?

Which function I should call from the main function to stop the current advertising instance and to start a new one?

I tried your scenario, but it shows the same problem

Thanking you

[AndreasF]

Hi.

 

AndreasF said:

Look at this question, there is an attached .zip file containing a modified beacon example, where start/stop advertising is implemented as a handle of pressing button 1 (in void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action))

 

Did you look at this? It's pretty straight forward shown how to use the two API's I posted in my previous reply.

The handle is initialized in the top of main.c

static uint8_t              m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; /**< Advertising handle used to identify an advertising set. */

And the pin handler starts and stops advertising.

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    ret_code_t err_code;

    nrf_drv_gpiote_out_toggle(PIN_OUT);
   

    if(is_advertising){ 
        err_code = sd_ble_gap_adv_stop(m_adv_handle);
        APP_ERROR_CHECK(err_code);
        NRF_LOG_INFO("Stopping advertising");
        is_advertising = false;
    } else{
        err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
        APP_ERROR_CHECK(err_code);
        NRF_LOG_INFO("Starting advertising");
        is_advertising = true;
    }
}

You have probably defined &m_advertising as your advertising handle.

- Andreas

[GK]

Hi Andeas,

Thank you very much for your reply.

That means I am not supposed to use the function "ble_advertising_start()" to start advertising?

 And instead of that should I use "sd_ble_gap_adv_start()" directly?

Inside this function  "ble_advertising_start()"   it uses "sd_ble_gap_adv_start()" and some more things extra.

Please shed some light.

[AndreasF]

Hi.

ble_advertising_start() is an API call to start advertising using the Advertising Module. At the bottom of the module, advertising is started by sd_ble_gap_adv_start() (line 657 in ble_advertising.c) If you don't need to do some of the "extra things" you refer to before you start advertising, you don't need to use ble_advertising_start().

If you only need to start or stop advertising you can safely use only sd_ble_gap_adv_start() and sd_ble_gap_adv_stop().

- Andreas