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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/ble_peripheral/ble_app_gatts_c/main.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/ble_peripheral/ble_app_gatts_c/main.c
new file mode 100644
index 0000000..b468587
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/ble_peripheral/ble_app_gatts_c/main.c
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+/**
+ * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
+ * 
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ * 
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+
+/** @brief GATT Service client example application main file.
+
+    @details This file contains the main source code for a sample client application that uses the
+             GATT Service. This client can be used to receive Service Changed indications. This is
+             needed if your application interacts with GATT servers that modify, remove or add
+             services. A typical course of action if a Service Changed indication is received is to
+             rediscover the database on the peer device.
+
+             For more information about the GATT Service, see "Defined Generic Attribute Profile Service"
+             in Bluetooth Specification Version 5.0 Vol 3, Part G Section 7.
+*/
+
+#include <stdint.h>
+#include <string.h>
+
+#include "app_adv.h"
+#include "nordic_common.h"
+#include "nrf.h"
+#include "app_error.h"
+#include "ble.h"
+#include "ble_srv_common.h"
+#include "ble_advdata.h"
+#include "ble_advertising.h"
+#include "nrf_sdh.h"
+#include "nrf_sdh_soc.h"
+#include "nrf_sdh_ble.h"
+#include "app_timer.h"
+#include "bsp.h"
+#include "bsp_btn_ble.h"
+#include "nrf_ble_gatts_c.h"
+#include "boards.h"
+#include "ble_gap.h"
+#include "nrf_ble_gatt.h"
+#include "nrf_ble_qwr.h"
+#include "peer_manager.h"
+#include "fds.h"
+#include "ble_conn_state.h"
+#include "nrf_pwr_mgmt.h"
+
+#include "nrf_log.h"
+#include "nrf_log_ctrl.h"
+#include "nrf_log_default_backends.h"
+
+#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 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_GATTS_C_DEF(m_gatts_c);                                     /**< GATT Service client instance. Handles Service Changed indications from the peer. */
+NRF_BLE_QWR_DEF(m_qwr);                                             /**< Context for the Queued Write module.*/
+BLE_DB_DISCOVERY_DEF(m_ble_db_discovery);                           /**< DB discovery module instance. */
+
+static bool    m_erase_bonds;                                       /**< Bool to determine if bonds should be erased before advertising starts. Based on button push upon startup. */
+
+static uint8_t m_pm_peer_srv_buffer[ALIGN_NUM(4, sizeof(ble_gatt_db_srv_t))] = {0}; /**< Data written to flash by peer manager must be aligned on 4 bytes.
+                                                                                         When loading and storing we will treat this byte array as a ble_gatt_db_srv_t.
+                                                                                         We use a static variable because it is written asynchronously. */
+
+/**@brief Function for assert macro callback.
+
+   @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] p_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 the LEDs initialization.
+
+   @details Initializes all LEDs used by the application.
+ */
+static void leds_init(void)
+{
+    bsp_board_init(BSP_INIT_LEDS);
+}
+
+
+/**@brief Function for the Timer initialization.
+
+   @details Initializes the timer module.
+ */
+static void timers_init(void)
+{
+    ret_code_t err_code;
+
+    err_code = app_timer_init();
+    APP_ERROR_CHECK(err_code);
+}
+
+
+/**@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);
+
+    memset(&gap_conn_params, 0, sizeof(gap_conn_params));
+
+    gap_conn_params.min_conn_interval = MSEC_TO_UNITS(MIN_CONN_INTERVAL_MSEC, UNIT_1_25_MS);
+    gap_conn_params.max_conn_interval = MSEC_TO_UNITS(MAX_CONN_INTERVAL_MSEC, UNIT_1_25_MS);
+    gap_conn_params.slave_latency     = SLAVE_LATENCY;
+    gap_conn_params.conn_sup_timeout  = MSEC_TO_UNITS(CONN_SUP_TIMEOUT_MSEC, UNIT_10_MS);
+
+    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
+    APP_ERROR_CHECK(err_code);
+}
+
+
+/**@brief Function for initializing buttons and leds.
+
+   @param[out] p_erase_bonds Boolean that will be set to true if the device is
+                             woken up by the BSP_EVENT_CLEAR_BONDING_DATA event.
+*/
+static void buttons_leds_init(bool * p_erase_bonds)
+{
+    ret_code_t  err_code;
+    bsp_event_t startup_event;
+
+    err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, NULL);
+    APP_ERROR_CHECK(err_code);
+
+    err_code = bsp_btn_ble_init(NULL, &startup_event);
+    APP_ERROR_CHECK(err_code);
+
+    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
+}
+
+
+/**@brief Function for handling events from the GATT Servive client module.
+
+   @param[in] p_evt GATT Service event.
+*/
+static void gatts_evt_handler(nrf_ble_gatts_c_evt_t * p_evt)
+{
+    ret_code_t err_code;
+
+    switch (p_evt->evt_type)
+    {
+        case NRF_BLE_GATTS_C_EVT_DISCOVERY_COMPLETE:
+        {
+            NRF_LOG_INFO("GATT Service and Service Changed characteristic found on server.");
+
+            err_code = nrf_ble_gatts_c_handles_assign(&m_gatts_c,
+                                                      p_evt->conn_handle,
+                                                      &p_evt->params.srv_changed_char);
+            APP_ERROR_CHECK(err_code);
+
+            pm_peer_id_t peer_id;
+            err_code = pm_peer_id_get(p_evt->conn_handle, &peer_id);
+            APP_ERROR_CHECK(err_code);
+
+
+            ble_gatt_db_srv_t srv_db_to_store;
+            srv_db_to_store.charateristics[0] = p_evt->params.srv_changed_char;
+            memcpy(m_pm_peer_srv_buffer, &srv_db_to_store, sizeof(ble_gatt_db_srv_t));
+
+            err_code = pm_peer_data_remote_db_store(peer_id,
+                                                    (ble_gatt_db_srv_t *)m_pm_peer_srv_buffer,
+                                                    sizeof(m_pm_peer_srv_buffer),
+                                                    NULL);
+
+            if (err_code == NRF_ERROR_STORAGE_FULL)
+            {
+                err_code = fds_gc();
+            }
+            APP_ERROR_CHECK(err_code);
+
+            err_code = nrf_ble_gatts_c_enable_indication(&m_gatts_c, true);
+            APP_ERROR_CHECK(err_code);
+        } break;
+
+        case NRF_BLE_GATTS_C_EVT_DISCOVERY_FAILED:
+            NRF_LOG_INFO("GATT Service or Service Changed characteristic not found on server.");
+            break;
+
+        case NRF_BLE_GATTS_C_EVT_DISCONN_COMPLETE:
+            NRF_LOG_INFO("GATTS Service client disconnected connection handle %i.", p_evt->conn_handle);
+
+            break;
+
+        case NRF_BLE_GATTS_C_EVT_SRV_CHANGED:
+            NRF_LOG_INFO("Service Changed indication received.");
+            NRF_LOG_INFO("Handle range start: %04x", p_evt->params.handle_range.start_handle);
+            NRF_LOG_INFO("Handle range end: %04x", p_evt->params.handle_range.end_handle);
+            break;
+
+        default:
+            break;
+    }
+}
+
+
+/**@brief Function for handling File Data Storage events.
+ *
+ * @param[in] p_evt  Flash Data Storage event.
+ *
+ */
+static void fds_evt_handler(fds_evt_t const * const p_evt)
+{
+    if (p_evt->id == FDS_EVT_GC)
+    {
+        NRF_LOG_DEBUG("GC completed.");
+    }
+}
+
+
+/**@brief Function for handling Peer Manager events.
+ *
+ * @param[in] p_evt  Peer Manager event.
+ */
+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_INFO("Connected to a previously bonded device.");
+            pm_peer_id_t peer_id;
+            err_code = pm_peer_id_get(p_evt->conn_handle, &peer_id);
+            APP_ERROR_CHECK(err_code);
+            if (peer_id != PM_PEER_ID_INVALID)
+            {
+
+                ble_gatt_db_srv_t * remote_db;
+                remote_db         = (ble_gatt_db_srv_t *)m_pm_peer_srv_buffer;
+                uint16_t data_len = sizeof(m_pm_peer_srv_buffer);
+
+                err_code = pm_peer_data_remote_db_load(peer_id, remote_db, &data_len);
+                if (err_code == NRF_ERROR_NOT_FOUND)
+                {
+                    NRF_LOG_DEBUG("Could not find the remote database in flash.");
+                    err_code = nrf_ble_gatts_c_handles_assign(&m_gatts_c, p_evt->conn_handle, NULL);
+                    APP_ERROR_CHECK(err_code);
+
+                    // Discover peer's services.
+                    memset(&m_ble_db_discovery, 0x00, sizeof(m_ble_db_discovery));
+                    err_code = ble_db_discovery_start(&m_ble_db_discovery, p_evt->conn_handle);
+                    APP_ERROR_CHECK(err_code);
+                }
+                else
+                {
+                    // Check if the load was successful.
+                    NRF_LOG_INFO("Remote Database loaded from flash.");
+                    APP_ERROR_CHECK(err_code);
+
+                    // Assign the loaded handles to the GATT Service client module.
+                    ble_gatt_db_char_t service_changed_handles = remote_db->charateristics[0];
+                    err_code = nrf_ble_gatts_c_handles_assign(&m_gatts_c,
+                                                              p_evt->conn_handle,
+                                                              &service_changed_handles);
+                    APP_ERROR_CHECK(err_code);
+
+                    // Enable indications.
+                    err_code = nrf_ble_gatts_c_enable_indication(&m_gatts_c, true);
+                    APP_ERROR_CHECK(err_code);
+                }
+            }
+        } break;
+
+        case PM_EVT_CONN_SEC_SUCCEEDED:
+        {
+            NRF_LOG_INFO("Connection secured: role: %d, conn_handle: 0x%x, procedure: %d.",
+                         ble_conn_state_role(p_evt->conn_handle),
+                         p_evt->conn_handle,
+                         p_evt->params.conn_sec_succeeded.procedure);
+
+            // Check it the Service Changed characteristic handle exists in our client instance.
+            // If it is invalid, we know service discovery is needed.
+            // (No database was loaded during @ref PM_EVT_BONDED_PEER_CONNECTED)
+            if (m_gatts_c.srv_changed_char.characteristic.handle_value == BLE_GATT_HANDLE_INVALID)
+            {
+                err_code = nrf_ble_gatts_c_handles_assign(&m_gatts_c, p_evt->conn_handle, NULL);
+                APP_ERROR_CHECK(err_code);
+
+                // Discover peer's services.
+                memset(&m_ble_db_discovery, 0x00, sizeof(m_ble_db_discovery));
+                err_code = ble_db_discovery_start(&m_ble_db_discovery, p_evt->conn_handle);
+                APP_ERROR_CHECK(err_code);
+            }
+
+        } break;
+
+        case PM_EVT_CONN_SEC_FAILED:
+            // Often, when securing fails, it should not be restarted, for security reasons.
+            // Other times, 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("Connection security failed: role: %d, conn_handle: 0x%x, procedure: %d, error: %d.",
+                         ble_conn_state_role(p_evt->conn_handle),
+                         p_evt->conn_handle,
+                         p_evt->params.conn_sec_failed.procedure,
+                         p_evt->params.conn_sec_failed.error);
+            break;
+
+        case PM_EVT_CONN_SEC_CONFIG_REQ:
+        {
+            // Reject pairing request from an already bonded peer.
+            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_STORAGE_FULL:
+            // Run garbage collection on the flash.
+            err_code = fds_gc();
+            if (err_code == FDS_ERR_NO_SPACE_IN_QUEUES)
+            {
+                // Retry.
+            }
+            else
+            {
+                APP_ERROR_CHECK(err_code);
+            }
+            break;
+
+        case PM_EVT_PEERS_DELETE_SUCCEEDED:
+            // Peer data was cleared from the flash. Start advertising with an empty list of peers.
+            NRF_LOG_DEBUG("PM_EVT_PEERS_DELETE_SUCCEEDED");
+            advertising_start(false);
+            break;
+
+        case PM_EVT_PEER_DATA_UPDATE_FAILED:
+            APP_ERROR_CHECK(p_evt->params.peer_data_update_failed.error);
+            break;
+
+        case PM_EVT_PEER_DELETE_FAILED:
+            APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
+            break;
+
+        case PM_EVT_PEERS_DELETE_FAILED:
+            APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
+            break;
+
+        case PM_EVT_ERROR_UNEXPECTED:
+            APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
+            break;
+
+        case PM_EVT_CONN_SEC_START:
+        // fall-through.
+        case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
+        // fall-through.
+        case PM_EVT_PEER_DELETE_SUCCEEDED:
+        // fall-through.
+        case PM_EVT_LOCAL_DB_CACHE_APPLIED:
+        // fall-through.
+        case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
+            // This can happen when the local DB has changed.
+        case PM_EVT_SERVICE_CHANGED_IND_SENT:
+        // fall-through.
+        case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
+        // fall-through.
+        default:
+            // No implementation needed.
+            break;
+    }
+}
+
+
+/**@brief Function for initializing the Peer Manager.
+ */
+void peer_manager_init(void)
+{
+    ret_code_t           err_code;
+    ble_gap_sec_params_t sec_param;
+
+    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.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);
+
+    err_code = fds_register(fds_evt_handler);
+    APP_ERROR_CHECK(err_code);
+}
+
+
+/**@brief Function for handling database discovery events.
+
+   @details This function is callback function to handle events from the database discovery module.
+            Depending on the UUIDs that are discovered, this function should forward the events
+            to their respective services.
+
+   @param[in] p_event  Pointer to the database discovery event.
+ */
+static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
+{
+    nrf_ble_gatts_c_on_db_disc_evt(&m_gatts_c, p_evt);
+}
+
+
+/**@brief Function for handling connection events.
+
+   @param[in] p_ble_evt Bluetooth stack event.
+*/
+static void on_connect(ble_evt_t const * p_ble_evt)
+{
+    ret_code_t err_code;
+    NRF_LOG_INFO("Connected.");
+
+    err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
+    APP_ERROR_CHECK(err_code);
+
+    err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, p_ble_evt->evt.gap_evt.conn_handle);
+    APP_ERROR_CHECK(err_code);
+}
+
+
+/**@brief Function for handling timeout BLE stack events.
+
+   @param[in] p_ble_evt Bluetooth stack event.
+*/
+static void on_timeout(ble_evt_t const * p_ble_evt)
+{
+    ret_code_t err_code;
+
+    switch (p_ble_evt->header.evt_id)
+    {
+        case BLE_GATTC_EVT_TIMEOUT:
+            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:
+            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 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;
+
+    switch (p_ble_evt->header.evt_id)
+    {
+        case BLE_GAP_EVT_CONNECTED:
+        {
+            on_connect(p_ble_evt);
+        } break;
+
+        case BLE_GAP_EVT_DISCONNECTED:
+            NRF_LOG_INFO("Disconnected.");
+            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_GATTS_EVT_SYS_ATTR_MISSING:
+            // No system attributes have been stored.
+            err_code = sd_ble_gatts_sys_attr_set(p_ble_evt->evt.gatts_evt.conn_handle, NULL, 0, 0);
+            APP_ERROR_CHECK(err_code);
+            break;
+
+        case BLE_GATTC_EVT_TIMEOUT:
+            // fall-through.
+        case BLE_GATTS_EVT_TIMEOUT:
+            on_timeout(p_ble_evt);
+            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 handler for BLE events.
+    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
+}
+
+
+/** @brief Database discovery initialization.
+*/
+static void db_discovery_init(void)
+{
+    ret_code_t err_code = ble_db_discovery_init(db_disc_handler);
+
+    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). 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 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_gatts_c_init_t gatts_c_init = {0};
+    nrf_ble_qwr_init_t     qwr_init     = {0};
+
+    // Initialize Queued Write Module.
+    qwr_init.error_handler = nrf_qwr_error_handler;
+
+    err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
+    APP_ERROR_CHECK(err_code);
+
+    // Initialize GATTS Client Module.
+    gatts_c_init.evt_handler = gatts_evt_handler;
+
+    err_code = nrf_ble_gatts_c_init(&m_gatts_c, &gatts_c_init);
+    APP_ERROR_CHECK(err_code);
+}
+
+
+/**@brief Function for initializing all the modules used in this example application.
+ */
+static void modules_init(void)
+{
+    log_init();
+    leds_init();
+    timers_init();
+    buttons_leds_init(&m_erase_bonds);
+    power_management_init();
+    ble_stack_init();
+    gap_params_init();
+    gatt_init();
+    db_discovery_init();
+    services_init();
+    advertising_init();
+    peer_manager_init();
+}
+
+
+/**@brief Function for application main entry.
+ */
+int main(void)
+{
+    // Initialize.
+    modules_init();
+
+    // Start execution.
+    NRF_LOG_INFO("GATT Service client started.");
+    advertising_start(m_erase_bonds);
+
+    // Enter main loop.
+    for (;;)
+    {
+        idle_state_handle();
+    }
+}
+
+
+/**
+ * @}
+ */