Advertising forever

[Bret Foreman]

I want my client to advertise forever so I added the following code:

static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_nus_on_ble_evt(&m_nus, p_ble_evt);
	  // Advertise forever
	  if (p_ble_evt->header.evt_id == BLE_GAP_EVT_TIMEOUT) {
          APP_ERROR_CHECK(ble_advertising_start(BLE_ADV_MODE_FAST));
      }
      else {
			on_ble_evt(p_ble_evt);
      }
    ble_advertising_on_ble_evt(p_ble_evt);
    // bsp_btn_ble_on_ble_evt(p_ble_evt);
    
}

When the initial fast-mode advertising finishes, this code calls ble_advertising_start but then hangs. Is there another method to do this?

[Gustavo - Argenox]

Hi Bret,

The advertising goes through a state machine and several states of FAST, SLOW and other advertisements. One easy way to avoid the BLE_ADV_EVT_IDLE from taking the system to sleep.

In the function on_adv_evt, the usual handler for the BLE_ADV_EVT_IDLE case is to run sleep_mode_enter() which is what stops advertising. Instead call:

ble_advertising_start(BLE_ADV_MODE_FAST);

To restart the FAST advertising (or change to SLOW or whichever you want).

We have devices that constantly advertise and they can go through several phases of advertisement depending on power requirements.