static void ble_stack_init(void)
{
    ret_code_t err_code;

    // Initialize the SoftDevice handler module.
    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = softdevice_app_ram_start_get(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Overwrite some of the default configurations for the BLE stack.
    ble_cfg_t ble_cfg;

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

    ble_cfg.common_cfg.vs_uuid_cfg.vs_uuid_count = 1;

    err_code = sd_ble_cfg_set(BLE_COMMON_CFG_VS_UUID, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    // Configure the maximum number of connections.
    memset(&ble_cfg, 0, sizeof(ble_cfg));
    ble_cfg.gap_cfg.role_count_cfg.periph_role_count  = PERIPHERAL_LINK_COUNT;
    ble_cfg.gap_cfg.role_count_cfg.central_role_count = CENTRAL_LINK_COUNT;
    ble_cfg.gap_cfg.role_count_cfg.central_sec_count  = BLE_GAP_ROLE_COUNT_CENTRAL_SEC_DEFAULT;
    err_code = sd_ble_cfg_set(BLE_GAP_CFG_ROLE_COUNT, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    memset(&ble_cfg, 0, sizeof(ble_cfg));
    ble_cfg.conn_cfg.params.gap_conn_cfg.conn_count     = PERIPHERAL_LINK_COUNT + CENTRAL_LINK_COUNT;
    ble_cfg.conn_cfg.params.gap_conn_cfg.event_length   = BLE_GAP_EVENT_LENGTH_DEFAULT;
    ble_cfg.conn_cfg.conn_cfg_tag                       = APP_CONN_CFG_TAG;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GAP, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);

    // Configure the maximum ATT MTU.
    memset(&ble_cfg, 0x00, sizeof(ble_cfg));
    ble_cfg.conn_cfg.conn_cfg_tag                 = APP_CONN_CFG_TAG;
    ble_cfg.conn_cfg.params.gatt_conn_cfg.att_mtu = NRF_BLE_GATT_MAX_MTU_SIZE;
    err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATT, &ble_cfg, ram_start);
    APP_ERROR_CHECK(err_code);
		
		ble_cfg.gatts_cfg.attr_tab_size.attr_tab_size = 4000;
		err_code = sd_ble_cfg_set(BLE_GATTS_CFG_ATTR_TAB_SIZE, &ble_cfg, ram_start);
		APP_ERROR_CHECK(err_code);
		
    // Enable BLE stack.
    err_code = softdevice_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for System events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
		(void) sd_ble_gap_tx_power_set(8);			
}