Unable to add multiple peripheral connections on my nrf52840 dongle

[Subbu_queter]

I think this code snippet is causing the issue, since I am able to make the device work by setting:

'NRF_SDH_BLE_PERIPHERAL_LINK_COUNT = 1' and
'NRF_SDH_BLE_TOTAL_LINK_COUNT = 1',

however it doesn't work upon setting it to more than one.

I think this code snippet is causing some issue, please help me out if anyone has resolved this!

/**@brief Function for handling the Connected event.
 *
 * @param[in] p_gap_evt GAP event received from the BLE stack.
 */
static void on_connected(const ble_gap_evt_t *const p_gap_evt) {
  ret_code_t err_code;
  uint32_t periph_link_cnt = ble_conn_state_peripheral_conn_count();    // Number of peripheral links.

  NRF_LOG_INFO("Connection with link 0x%x established.", p_gap_evt->conn_handle);

  // Assign connection handle to available instance of QWR module.
  for (uint32_t i = 0; i < NRF_SDH_BLE_PERIPHERAL_LINK_COUNT; i++) {
    if (m_qwrs[i].conn_handle == BLE_CONN_HANDLE_INVALID) {
      err_code = nrf_ble_qwr_conn_handle_assign(&m_qwrs[i], p_gap_evt->conn_handle);
      APP_ERROR_CHECK(err_code);
      break;
    }
  }

  err_code = app_button_enable();
  APP_ERROR_CHECK(err_code);

  // Update LEDs
  bsp_board_led_on(CONNECTED_LED);
  if (periph_link_cnt == NRF_SDH_BLE_PERIPHERAL_LINK_COUNT) {
    bsp_board_led_off(ADVERTISING_LED);
  } else {
    // Continue advertising. More connections can be established because the maximum link count has not been reached.
    advertising_start();
  }
}

Github

[Hung Bui]

Hi Subramanya, 

Please tell us more about your application. Are you using the dongle as the peripheral and connect to multiple centrals ? 

What's the issue when you set 
NRF_SDH_BLE_TOTAL_LINK_COUNT = 2

NRF_SDH_BLE_TOTAL_LINK_COUNT =2 ? 

Have you readjust the softdevice memory configuration if needed ? 

Have you tried to test with ble_app_multiperipheral example in \examples\ble_peripheral\experimental ?

[Subbu_queter]

Whenever I tried to build the multi-peri example, it errors out the following:


, while my directory path looks like this: C:\Users\HI\Desktop\nrf52840\nRF5_SDK_17.1.0_ddde560\components

I tried manually including path but then it throws out an error for almost every file (Error: Source file doesn't exist)

So I tried to copy pasted the required snippets onto my main project, this(Error: Source file doesn't exist) wasn't thrown, however I am unable to connect my dongle as a peripheral to multiple android phones.

Placement macros:


Code:

#include <stdbool.h>
#include <stdint.h>
#include <string.h>

#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_conn_params.h"
#include "nrf_sdh.h"
#include "nrf_sdh_soc.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "fds.h"
#include "peer_manager.h"
#include "peer_manager_handler.h"
#include "bsp_btn_ble.h"
#include "sensorsim.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#include "ble_cus.h"


#define ADVERTISING_LED                 BSP_BOARD_LED_0                         /**< Is on when device is advertising. */
#define CONNECTED_LED                   BSP_BOARD_LED_1                         /**< Is on when device has connected. */
#define ZERO_PEER                       BSP_BOARD_LED_2
#define LINK_TOTAL                      NRF_SDH_BLE_PERIPHERAL_LINK_COUNT + \
                                        NRF_SDH_BLE_CENTRAL_LINK_COUNT

#define DEVICE_NAME                     "Ashen"                                 /**< Name of device. Will be included in the advertising data. */
#define APP_ADV_INTERVAL                300                                     /**< The advertising interval (in units of 0.625 ms. This value corresponds to 187.5 ms). */
#define APP_ADV_DURATION                0                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */
#define APP_BLE_OBSERVER_PRIO           3                                       /**< Application's BLE observer priority. You shouldn't need to modify this value. */
#define APP_BLE_CONN_CFG_TAG            1                                       /**< A tag identifying the SoftDevice BLE configuration. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)        /**< Minimum acceptable connection interval (0.1 seconds). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)        /**< Maximum acceptable connection interval (0.2 second). */
#define SLAVE_LATENCY                   0                                       /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)         /**< Connection supervisory timeout (4 seconds). */

#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                   /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)                  /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                       /**< Number of attempts before giving up the connection parameter negotiation. */

#define SEC_PARAM_BOND                  1                                       /**< Perform bonding. */
#define SEC_PARAM_MITM                  0                                       /**< Man In The Middle protection not required. */
#define SEC_PARAM_LESC                  0                                       /**< LE Secure Connections not enabled. */
#define SEC_PARAM_KEYPRESS              0                                       /**< Keypress notifications not enabled. */
#define SEC_PARAM_IO_CAPABILITIES       BLE_GAP_IO_CAPS_NONE                    /**< No I/O capabilities. */
#define SEC_PARAM_OOB                   0                                       /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE          7                                       /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE          16                                      /**< Maximum encryption key size. */

#define DEAD_BEEF                       0xDEADBEEF                              /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */


NRF_BLE_GATT_DEF(m_gatt);                                                       /**< GATT module instance. */
NRF_BLE_QWRS_DEF(m_qwr, NRF_SDH_BLE_PERIPHERAL_LINK_COUNT);                     /**< Context for the Queued Write module.*/
BLE_CUS_DEF(m_cus);                                                             /**< Custom service.*/

//static uint16_t m_conn_handle[3] = {BLE_CONN_HANDLE_INVALID, BLE_CONN_HANDLE_INVALID, BLE_CONN_HANDLE_INVALID};  /**< Handle of the current connections. */

static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;                   /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX];                    /**< Buffer for storing an encoded advertising set. */
static uint8_t m_enc_scan_response_data[BLE_GAP_ADV_SET_DATA_SIZE_MAX];         /**< Buffer for storing an encoded scan data. */

/**@brief Struct that contains pointers to the encoded advertising data. */
static ble_gap_adv_data_t m_adv_data =
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX
    },
    .scan_rsp_data =
    {
        .p_data = m_enc_scan_response_data,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX

    }
};

static ble_uuid_t m_adv_uuids[] =                                               /**< Universally unique service identifiers. */
{
    {CUSTOM_SERVICE_UUID, BLE_UUID_TYPE_VENDOR_BEGIN} 
};


static void advertising_start(bool erase_bonds);
static void custom_adv_stop(void);
static ble_gap_adv_params_t adv_params;

/**@brief Callback function for asserts in the SoftDevice.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num   Line number of the failing ASSERT call.
 * @param[in] file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

/**@brief Function for setting filtered whitelist.
 *
 * @param[in] skip  Filter passed to @ref pm_peer_id_list.
 */
static void whitelist_set(pm_peer_id_list_skip_t skip) {
    pm_peer_id_t peer_ids[BLE_GAP_WHITELIST_ADDR_MAX_COUNT];
    uint32_t peer_id_count = BLE_GAP_WHITELIST_ADDR_MAX_COUNT;

    ret_code_t err_code = pm_peer_id_list(peer_ids, &peer_id_count, PM_PEER_ID_INVALID, skip);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_INFO("\tm_whitelist_peer_cnt %d, MAX_PEERS_WLIST %d",
                 peer_id_count + 1,
                 BLE_GAP_WHITELIST_ADDR_MAX_COUNT);

    err_code = pm_whitelist_set(peer_ids, peer_id_count);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for setting filtered device identities.
 *
 * @param[in] skip  Filter passed to @ref pm_peer_id_list.
static void identities_set(pm_peer_id_list_skip_t skip) {
    pm_peer_id_t peer_ids[BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT];
    uint32_t peer_id_count = BLE_GAP_DEVICE_IDENTITIES_MAX_COUNT;

    ret_code_t err_code = pm_peer_id_list(peer_ids, &peer_id_count, PM_PEER_ID_INVALID, skip);
    APP_ERROR_CHECK(err_code);

    err_code = pm_device_identities_list_set(peer_ids, peer_id_count);
    APP_ERROR_CHECK(err_code);
}
 */

/**@brief Clear bond information from persistent storage.
 */
static void delete_bonds(void) {
    ret_code_t err_code;

    NRF_LOG_INFO("Erase bonds!");

    err_code = pm_peers_delete();
    APP_ERROR_CHECK(err_code);
}


static void pm_evt_handler(pm_evt_t const *p_evt) {
    ret_code_t err_code;

    switch (p_evt->evt_id) {
        case PM_EVT_BONDED_PEER_CONNECTED:
            NRF_LOG_DEBUG("PM_EVT_BONDED_PEER_CONNECTED");
            // Update the rank of the peer.
            err_code = pm_peer_rank_highest(p_evt->peer_id);
            break;
        case PM_EVT_CONN_SEC_START:
            NRF_LOG_DEBUG("PM_EVT_CONN_SEC_START");
            break;
        case PM_EVT_CONN_SEC_SUCCEEDED:
            NRF_LOG_DEBUG("PM_EVT_CONN_SEC_SUCCEEDED");
            // Update the rank of the peer.
            err_code = pm_peer_rank_highest(p_evt->peer_id);
            break;
        case PM_EVT_CONN_SEC_FAILED:
            NRF_LOG_DEBUG("PM_EVT_CONN_SEC_FAILED");
            // In some cases, when securing fails, it can be restarted directly. Sometimes it can be
            // restarted, but only after changing some Security Parameters. Sometimes, it cannot be
            // restarted until the link is disconnected and reconnected. Sometimes it is impossible
            // to secure the link, or the peer device does not support it. How to handle this error
            // is highly application-dependent.
            //            NRF_LOG_INFO("Failed to secure connection. Disconnecting.");
            //            err_code = sd_ble_gap_disconnect(m_conn_handle,
            //                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            //            if (err_code != NRF_ERROR_INVALID_STATE)
            //            {
            //                APP_ERROR_CHECK(err_code);
            //            }
            //            m_conn_handle = BLE_CONN_HANDLE_INVALID;

            break;
        case PM_EVT_CONN_SEC_CONFIG_REQ: {
            NRF_LOG_DEBUG("PM_EVT_CONN_SEC_CONFIG_REQ");
            // A connected peer (central) is trying to pair, but the Peer Manager already has a bond
            // for that peer. Setting allow_repairing to false rejects the pairing request.
            // If this event is ignored (pm_conn_sec_config_reply is not called in the event
            // handler), the Peer Manager assumes allow_repairing to be false.
            pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
            pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
        } break;
        case PM_EVT_CONN_SEC_PARAMS_REQ: {
            NRF_LOG_DEBUG("PM_EVT_CONN_SEC_PARAMS_REQ");
            // If you want to set different security parameters for particular peers, you can do
            // so here. Pass the desired security parameters to pm_conn_sec_params_reply().
            //            err_code = pm_conn_sec_params_reply(p_evt->conn_handle,
            //                                               &sec_param,
            //                                                p_evt->params.conn_sec_params_req.p_context);
            //            APP_ERROR_CHECK(err_code);
        } break;
        case PM_EVT_STORAGE_FULL:
            NRF_LOG_DEBUG("PM_EVT_STORAGE_FULL");
            // Run garbage collection on the flash.
            err_code = fds_gc();
            if (err_code == FDS_ERR_BUSY || err_code == FDS_ERR_NO_SPACE_IN_QUEUES) {
                // Retry.
            } else {
                APP_ERROR_CHECK(err_code);
            }
            break;
        case PM_EVT_ERROR_UNEXPECTED:
            NRF_LOG_DEBUG("PM_EVT_ERROR_UNEXPECTED");
            // Assert.
            APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
            break;
        case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
            NRF_LOG_DEBUG("PM_EVT_PEER_DATA_UPDATE_SUCCEEDED");
            if (p_evt->params.peer_data_update_succeeded.flash_changed && (p_evt->params.peer_data_update_succeeded.data_id == PM_PEER_DATA_ID_BONDING)) {
                NRF_LOG_INFO("New Bond, add the peer to the whitelist if possible");
                // Note: You should check on what kind of white list policy your application should use.

                whitelist_set(PM_PEER_ID_LIST_SKIP_NO_ID_ADDR);
            }
            break;
        case PM_EVT_PEER_DATA_UPDATE_FAILED:
            NRF_LOG_DEBUG("PM_EVT_PEER_DATA_UPDATE_SUCCEEDED");
            // Assert.
            APP_ERROR_CHECK_BOOL(false);
            break;
        case PM_EVT_PEER_DELETE_SUCCEEDED:
            NRF_LOG_DEBUG("PM_EVT_PEER_DELETE_SUCCEEDED");
            break;
        case PM_EVT_PEER_DELETE_FAILED:
            NRF_LOG_DEBUG("PM_EVT_PEER_DELETE_FAILED");
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
            break;
        case PM_EVT_PEERS_DELETE_SUCCEEDED:
            NRF_LOG_DEBUG("PM_EVT_PEERS_DELETE_SUCCEEDED");
            advertising_start(false);
            break;
        case PM_EVT_PEERS_DELETE_FAILED:
            NRF_LOG_DEBUG("PM_EVT_PEERS_DELETE_FAILED");
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
            break;
        case PM_EVT_LOCAL_DB_CACHE_APPLIED:
            NRF_LOG_DEBUG("PM_EVT_LOCAL_DB_CACHE_APPLIED");
            break;
        case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
            NRF_LOG_DEBUG("PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED");
            // The local database has likely changed, send service changed indications.
            pm_local_database_has_changed();
            break;
        case PM_EVT_SERVICE_CHANGED_IND_SENT:
            NRF_LOG_DEBUG("PM_EVT_SERVICE_CHANGED_IND_SENT");
            break;
        case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
            NRF_LOG_DEBUG("PM_EVT_SERVICE_CHANGED_IND_CONFIRMED");
            break;
    }
}


/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    ret_code_t              err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *)DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    /* YOUR_JOB: Use an appearance value matching the application's use case.
       err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_);
       APP_ERROR_CHECK(err_code); */

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the GATT module.
 */
static void gatt_init(void)
{
    ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling Queued Write Module errors.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{

    ret_code_t              err_code;
    nrf_ble_qwr_init_t      qwr_init = {0};

    qwr_init.error_handler = nrf_qwr_error_handler;

    for(int i = 0; i < NRF_SDH_BLE_PERIPHERAL_LINK_COUNT; i++) 
    {err_code = nrf_ble_qwr_init(&m_qwr[i], &qwr_init);
    APP_ERROR_CHECK(err_code);}

    ble_cus_init_t      cus_init;

    memset(&cus_init, 0, sizeof(cus_init));

    err_code = ble_cus_init(&m_cus, &cus_init);
    APP_ERROR_CHECK(err_code);
    
    //ble_conn_state_init();
}


/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module which
 *          are passed to the application.
 *          @note All this function does is to disconnect. This could have been done by simply
 *                setting the disconnect_on_fail config parameter, but instead we use the event
 *                handler mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    ret_code_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle[0], BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}
*/

/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    ret_code_t             err_code;
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    //cp_init.evt_handler                  = on_conn_params_evt; 
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the Connected event.
 *
 * @param[in] p_gap_evt GAP event received from the BLE stack.
 */
static void on_connected(const ble_gap_evt_t * const p_gap_evt)
{
    ret_code_t  err_code;
    uint32_t    periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links.

    NRF_LOG_INFO("Connection with link 0x%x established.", p_gap_evt->conn_handle);

    // Assign connection handle to available instance of QWR module.
    for (uint32_t i = 0; i < NRF_SDH_BLE_PERIPHERAL_LINK_COUNT; i++)
    {
        if (m_qwr[i].conn_handle == BLE_CONN_HANDLE_INVALID)
        {
            err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr[i], p_gap_evt->conn_handle);
            APP_ERROR_CHECK(err_code);
            break;
        }
    }
    /**
    err_code = app_button_enable();
    APP_ERROR_CHECK(err_code);
    */

    // Update LEDs
    bsp_board_led_on(CONNECTED_LED);
    if (periph_link_cnt == NRF_SDH_BLE_PERIPHERAL_LINK_COUNT)
    {   
        custom_adv_stop();
        bsp_board_led_off(ADVERTISING_LED);
    }
    else
    {
        // Continue advertising. More connections can be established because the maximum link count has not been reached.
        advertising_start(false);
    }
}


/**@brief Function for handling the Disconnected event.
 *
 * @param[in] p_gap_evt GAP event received from the BLE stack.
 */
static void on_disconnected(ble_gap_evt_t const * const p_gap_evt)
{
    ret_code_t  err_code;
    uint32_t    periph_link_cnt = ble_conn_state_peripheral_conn_count(); // Number of peripheral links.

    NRF_LOG_INFO("Connection 0x%x has been disconnected. Reason: 0x%X",
                 p_gap_evt->conn_handle,
                 p_gap_evt->params.disconnected.reason);

    if (periph_link_cnt == 0)
    {
        bsp_board_led_off(CONNECTED_LED);
        err_code = app_button_disable();
        APP_ERROR_CHECK(err_code);
        
    }

    if (periph_link_cnt == (NRF_SDH_BLE_PERIPHERAL_LINK_COUNT - 1))
    {
        // Advertising is not running when all connections are taken, and must therefore be started.
        advertising_start(false);
    }
}


/**@brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    ret_code_t err_code = NRF_SUCCESS;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            on_disconnected(&p_ble_evt->evt.gap_evt);
            break;

        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected.");
            on_connected(&p_ble_evt->evt.gap_evt);
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = BLE_GAP_PHY_AUTO,
            };
            err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
            APP_ERROR_CHECK(err_code);
        } break;

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            NRF_LOG_DEBUG("GATT Client Timeout.");
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTS_EVT_TIMEOUT:
            // Disconnect on GATT Server timeout event.
            NRF_LOG_DEBUG("GATT Server Timeout.");
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break;

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}


/**@brief Function for the Peer Manager initialization.
 */
static void peer_manager_init(void)
{
    ble_gap_sec_params_t sec_param;
    ret_code_t           err_code;

    err_code = pm_init();
    APP_ERROR_CHECK(err_code);

    memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));

    // Security parameters to be used for all security procedures.
    sec_param.bond           = SEC_PARAM_BOND;
    sec_param.mitm           = SEC_PARAM_MITM;
    sec_param.lesc           = SEC_PARAM_LESC;
    sec_param.keypress       = SEC_PARAM_KEYPRESS;
    sec_param.io_caps        = SEC_PARAM_IO_CAPABILITIES;
    sec_param.oob            = SEC_PARAM_OOB;
    sec_param.min_key_size   = SEC_PARAM_MIN_KEY_SIZE;
    sec_param.max_key_size   = SEC_PARAM_MAX_KEY_SIZE;
    sec_param.kdist_own.enc  = 1;
    sec_param.kdist_own.id   = 1;
    sec_param.kdist_peer.enc = 1;
    sec_param.kdist_peer.id  = 1;

    err_code = pm_sec_params_set(&sec_param);
    APP_ERROR_CHECK(err_code);

    err_code = pm_register(pm_evt_handler);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for starting advertising.
 */
static void advertising_start(bool erase_bonds) {
    NRF_LOG_INFO("start advertising");

    if (erase_bonds) {
        delete_bonds();
        return; 
    }
    
    pm_peer_id_t peer_ids[BLE_GAP_WHITELIST_ADDR_MAX_COUNT];
    uint32_t peer_count = BLE_GAP_WHITELIST_ADDR_MAX_COUNT;

    ret_code_t err_code = pm_peer_id_list(
        peer_ids,
        &peer_count,
        PM_PEER_ID_INVALID,
        PM_PEER_ID_LIST_SKIP_NO_ID_ADDR
    );
    APP_ERROR_CHECK(err_code);
    

    if (peer_count == 0) {
        NRF_LOG_INFO("No bonds. Advertising to ANY.");
        adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;
        bsp_board_led_on(ZERO_PEER);
    } else {
        NRF_LOG_INFO("Bonded peers present (%d). Advertising to WHITELIST.", peer_count);
        whitelist_set(PM_PEER_ID_LIST_SKIP_NO_ID_ADDR); 
        adv_params.filter_policy = BLE_GAP_ADV_FP_FILTER_CONNREQ;
        bsp_board_led_off(ZERO_PEER);
    }

    
    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
    APP_ERROR_CHECK(err_code);

    
    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

    bsp_board_led_on(ADVERTISING_LED);
}


static void custom_adv_stop(void) {
    NRF_LOG_INFO("stop advertising");
    ret_code_t err_code;

    err_code = sd_ble_gap_adv_stop(m_adv_handle);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the Advertising functionality.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    ret_code_t    err_code;
    ble_advdata_t advdata;
    ble_advdata_t srdata;

    //ble_uuid_t adv_uuids[] = {{LBS_UUID_SERVICE, m_lbs.uuid_type}};

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    memset(&srdata, 0, sizeof(srdata));
    srdata.uuids_complete.p_uuids = m_adv_uuids;
    srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids)/sizeof(m_adv_uuids[0]);

    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = ble_advdata_encode(&srdata, m_adv_data.scan_rsp_data.p_data, &m_adv_data.scan_rsp_data.len);
    APP_ERROR_CHECK(err_code);


    // Set advertising parameters.
    memset(&adv_params, 0, sizeof(adv_params));
    adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    adv_params.p_peer_addr     = NULL;
    adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
    adv_params.secondary_phy   = BLE_GAP_PHY_1MBPS;
    adv_params.duration        = APP_ADV_DURATION;
    adv_params.interval        = APP_ADV_INTERVAL;
    //adv_params.filter_policy   = BLE_GAP_ADV_FP_FILTER_CONNREQ;

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing the nrf log module.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


/**@brief Function for application main entry.
 */
int main(void)
{
    //bool erase_bonds;
    log_init();
    bsp_board_init(BSP_INIT_LEDS);
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    peer_manager_init();
    advertising_init();
    conn_params_init();

    // Start execution.
    NRF_LOG_INFO("Template example started.");

    advertising_start(true);

    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
    }
}