Advertising with no timeout

[Maciej Baster]

Hi,

I'm developing an app which requires continuous advertising. I use following ble_gap_adv_params_t:

   ble_gap_adv_params_t adv_params;
    memset(&adv_params, 0, sizeof(adv_params));
    
    adv_params.type = BLE_GAP_ADV_TYPE_ADV_IND;
    adv_params.p_peer_addr = NULL;
    adv_params.fp = BLE_GAP_ADV_FP_ANY;
    adv_params.interval = 320;
    adv_params.timeout = 0;

Documentation says that if timeout equals 0 then advertising doesn't stop. However, when I call sd_ble_gap_adv_start(&adv_params) the function returns error_code = 0x07 (which indicates invalid parameters). Where is the bug? Or is there another way to accomplish continuous advertising other than restarting it in the timeout handler?

[Carles]

Hi,

Have you set the advertisement data first with:

sd_ble_gap_adv_data_set()

?

You will need to do that first so that the stack knows what adv flags you intend to use, and check whether those are compatible with unlimited advertising.

Carles

[Pål Håland]

Hi Maciej,

This could happen if you have set the flags in the advertisement data to be BLE_GAP_ADV_FLAG_LE_LIMITED_DISC_MODE. The limited discoverable mode is not allowed to advertise longer than a certain period of time.

In undiscoverable mode and general discoverable mode this should not be an issue.

BR Pål

[Maciej Baster]

Carles, Pål

Thank you for your quick response. You were right. I was advertising with BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE. After changing it to BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE no error is returned when I try to set timeout value to zero. Thanks once again!

Best regards, Maciej

[Pål Håland]

Hi Maciej,

Do you think you could set one of the answers as accepted answer, as this will help others finding a solution to their symptom of a problem.

(They would see that this question have been solved)

[brian fleming]

This answer worked for me.