how to advertising while connection?

[cucu]

[Dev Env]

nRF51 DK

IoT SDK 0.8

IoT SoftDevice

CoAP_Server_example (base code)

[Question]

why stop advertising while connection? (BLE_GAP_EVT_CONNECTED)

and start advertising (BLE_GAP_EVT_DISCONNECTED) that is ble spec?

how to advertising while connection?

when BLE_GAP_EVT_CONNECTED case , call function advertising_start()?

please help me

[cucu]

my code

 switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
			m_display_state = LEDS_IPV6_IF_DOWN;
			m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle; 

			
			err_code = sd_ble_gap_adv_stop();
			APPL_LOG ("[APPL]:[sd_ble_gap_adv_stop][err_code:%d]\n" , err_code);
		
		    // Initialize advertising parameters (used when starting advertising).
    

    m_adv_params.type = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
    err_code = sd_ble_gap_adv_start(&m_adv_params); // error code - NRF_ERROR_INVALID_STATE