Stopping advertising


i got problem wher program cant go in while loop in main while advertising is running. Im using ble uart template. So was thinking to stop advertising when button is pressed but i didnt find solution noowher how to stop advertising. In beacon mode i can acces to while loop in main. 

Here is my funtion to start advertising.

void advertising_start(void)
    uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST );