--- C:/Users/GrzegorzN1/Desktop/main.c	Thu Mar 22 16:25:09 2018
+++ C:/Users/GrzegorzN1/eclipse-workspace/fault_test/src/main.c	Tue May 29 14:55:55 2018
@@ -132,12 +132,14 @@
 
 #define OSTIMER_WAIT_FOR_QUEUE              2                                       /**< Number of ticks to wait for the timer queue to be ready */
 
+#define SECURITY_REQUEST_DELAY         APP_TIMER_TICKS(1500)                        /**< Delay after connection until security request is sent, if necessary (ticks). */
 
 BLE_BAS_DEF(m_bas);                                                 /**< Battery service instance. */
 BLE_HRS_DEF(m_hrs);                                                 /**< Heart rate service instance. */
 NRF_BLE_GATT_DEF(m_gatt);                                           /**< GATT module instance. */
 NRF_BLE_QWR_DEF(m_qwr);                                             /**< Context for the Queued Write module.*/
 BLE_ADVERTISING_DEF(m_advertising);                                 /**< Advertising module instance. */
+APP_TIMER_DEF(m_sec_req_timer_id);                                  /**< Security request timer. The timer lets us start pairing request if one does not arrive from the Central. */
 
 static uint16_t m_conn_handle         = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */
 static bool     m_rr_interval_enabled = true;                       /**< Flag for enabling and disabling the registration of new RR interval measurements (the purpose of disabling this is just to test sending HRM without RR interval data. */
@@ -396,6 +398,34 @@
     ble_hrs_sensor_contact_detected_update(&m_hrs, sensor_contact_detected);
 }
 
+/**@brief Function for handling the security request timer time-out.
+ *
+ * @details This function is called each time the security request timer expires.
+ *
+ * @param[in] p_context  Pointer used for passing context information from the
+ *                       app_start_timer() call to the time-out handler.
+ */
+static void sec_req_timeout_handler(void * p_context)
+{
+    ret_code_t           ret;
+    pm_conn_sec_status_t status;
+
+    if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
+    {
+        ret = pm_conn_sec_status_get(m_conn_handle, &status);
+        APP_ERROR_CHECK(ret);
+
+        // If the link is still not secured by the peer, initiate security procedure.
+        if (!status.encrypted)
+        {
+            ret = pm_conn_secure(m_conn_handle, false);
+            if (ret != NRF_ERROR_INVALID_STATE)
+            {
+                APP_ERROR_CHECK(ret);
+            }
+        }
+    }
+}
 
 /**@brief Function for the Timer initialization.
  *
@@ -437,6 +467,12 @@
     {
         APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
     }
+
+    // Create security request timer.
+    err_code = app_timer_create(&m_sec_req_timer_id,
+						   APP_TIMER_MODE_SINGLE_SHOT,
+						   sec_req_timeout_handler);
+    APP_ERROR_CHECK(err_code);
 }
 
 
@@ -735,6 +771,8 @@
             APP_ERROR_CHECK(err_code);
             m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
             err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
+            APP_ERROR_CHECK(err_code);
+            err_code = app_timer_start(m_sec_req_timer_id, SECURITY_REQUEST_DELAY, NULL);
             APP_ERROR_CHECK(err_code);
             break;