In sdk 12 in ble_gap.h the structure is as follows 

typedef struct
{
  uint8_t               type;                 /**< See @ref BLE_GAP_ADV_TYPES. */
  ble_gap_addr_t const *p_peer_addr;          /**< Address of a known peer.
                                                   - When privacy is enabled and the local device use @ref BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE addresses, the device identity list is searched for a matching
                                                     entry. If the local IRK for that device identity is set, the local IRK for that device will be used to generate the advertiser address field in the advertise packet.
                                                   - If type is @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, this must be set to the targeted initiator. If the initiator is in the device identity list,
                                                     the peer IRK for that device will be used to generate the initiator address field in the ADV_DIRECT_IND packet. */
  uint8_t               fp;                   /**< Filter Policy, see @ref BLE_GAP_ADV_FILTER_POLICIES. */
  uint16_t              interval;             /**< Advertising interval between 0x0020 and 0x4000 in 0.625 ms units (20ms to 10.24s), see @ref BLE_GAP_ADV_INTERVALS.
                                                   - If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, this parameter must be set to 0 for high duty cycle directed advertising.
                                                   - If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, set @ref BLE_GAP_ADV_INTERVAL_MIN <= interval <= @ref BLE_GAP_ADV_INTERVAL_MAX for low duty cycle advertising.*/
  uint16_t              timeout;              /**< Advertising timeout between 0x0001 and 0x3FFF in seconds, 0x0000 disables timeout. See also @ref BLE_GAP_ADV_TIMEOUT_VALUES. If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, this parameter must be set to 0 for High duty cycle directed advertising. */
  ble_gap_adv_ch_mask_t channel_mask;         /**< Advertising channel mask. See @ref ble_gap_adv_ch_mask_t. */
} ble_gap_adv_params_t;

But to implement the code as per your blog I had to change this structure to

typedef struct
{
  uint8_t               type;                 /**< See @ref BLE_GAP_ADV_TYPES. */
  ble_gap_addr_t       *p_peer_addr;          /**< For @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND mode only, known peer address. */
  uint8_t               fp;                   /**< Filter Policy, see @ref BLE_GAP_ADV_FILTER_POLICIES. */
  ble_gap_whitelist_t  *p_whitelist;          /**< Pointer to whitelist, NULL if no whitelist or the current active whitelist is to be used. */
  uint16_t              interval;             /**< Advertising interval between 0x0020 and 0x4000 in 0.625 ms units (20ms to 10.24s), see @ref BLE_GAP_ADV_INTERVALS.
                                                   - If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, this parameter must be set to 0 for high duty cycle directed advertising.
                                                   - If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, set @ref BLE_GAP_ADV_INTERVAL_MIN <= interval <= @ref BLE_GAP_ADV_INTERVAL_MAX for low duty cycle advertising.*/
  uint16_t              timeout;              /**< Advertising timeout between 0x0001 and 0x3FFF in seconds, 0x0000 disables timeout. See also @ref BLE_GAP_ADV_TIMEOUT_VALUES. If type equals @ref BLE_GAP_ADV_TYPE_ADV_DIRECT_IND, this parameter must be set to 0 for High duty cycle directed advertising. */
  ble_gap_adv_ch_mask_t channel_mask;         /**< Advertising channel mask. See @ref ble_gap_adv_ch_mask_t. */
} ble_gap_adv_params_t;

So adding  ble_gap_whitelist_t  *p_whitelist; in the structure cause problem to advertise and it stops.


Thanks