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diff --git a/src/sample/ble_bt5_central/link_mgr.h b/src/sample/ble_bt5_central/link_mgr.h
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+++ b/src/sample/ble_bt5_central/link_mgr.h
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+/**
+*****************************************************************************************
+*     Copyright(c) 2018, Realtek Semiconductor Corporation. All rights reserved.
+*****************************************************************************************
+   * @file      link_mgr.h
+   * @brief     Define struct and functions about link.
+   * @author    berni
+   * @date      2018-04-27
+   * @version   v1.0
+   **************************************************************************************
+   * @attention
+   * <h2><center>&copy; COPYRIGHT 2018 Realtek Semiconductor Corporation</center></h2>
+   **************************************************************************************
+  */
+#ifndef _LINK_MANAGER_H_
+#define _LINK_MANAGER_H_
+/*============================================================================*
+ *                              Header Files
+ *============================================================================*/
+#include "gap_conn_le.h"
+#include "app_msg.h"
+
+/*============================================================================*
+ *                              Constants
+ *============================================================================*/
+/** @brief  Define device list table size. */
+#define APP_MAX_DEVICE_INFO 30
+#if APP_RECOMBINE_ADV_DATA
+/** @brief  Maximum advertising data size. */
+#define APP_MAX_EXT_ADV_TOTAL_LEN 1024
+#endif
+
+/** @addtogroup  BT5_CENTRAL_SCAN_MGR
+    * @{
+    */
+/** @brief  Extended Scan Mode List.*/
+typedef enum
+{
+    SCAN_UNTIL_DISABLED, /**< If Duration parameter is zero, continue scanning until scanning is disabled. */
+    PERIOD_SCAN_UNTIL_DISABLED, /**< If Duration and Period parameters are non-zero, scan for the duration within a scan period, and scan periods continue until scanning is disabled. */
+    SCAN_UNTIL_DURATION_EXPIRED, /**< If Duration parameter is non-zero and Period parameter is zero, continue scanning until duration has expired. */
+} T_EXT_SCAN_MODE;
+
+/**
+ * @brief  Device list block definition.
+ */
+typedef struct
+{
+    uint8_t      bd_addr[GAP_BD_ADDR_LEN];  /**< remote BD */
+    uint8_t      bd_type;              /**< remote BD type*/
+} T_DEV_INFO;
+
+#if APP_RECOMBINE_ADV_DATA
+/**
+ * @brief  Advertising data.
+ */
+typedef struct
+{
+    uint8_t      bd_addr[GAP_BD_ADDR_LEN];           /**< remote BD */
+    bool
+    flag;                               /**< flag of recombining advertising data, true: recombining, false: waiting extended advertising PDUs */
+    uint16_t     event_type;                         /**< advertising event type */
+    uint16_t     data_len;                           /**< length of recombined advertising data */
+    uint8_t      p_data[APP_MAX_EXT_ADV_TOTAL_LEN];  /**< recombined advertising data */
+} T_EXT_ADV_DATA;
+#endif
+/** @} */
+
+/*============================================================================*
+ *                              Variables
+ *============================================================================*/
+/** @brief  Device list table, used to save discovered device informations. */
+extern T_DEV_INFO dev_list[APP_MAX_DEVICE_INFO];
+/** @brief  The number of device informations saved in dev_list. */
+extern uint8_t dev_list_count;
+#if APP_RECOMBINE_ADV_DATA
+/** @brief  Advertising data, used to save advertising data. */
+extern T_EXT_ADV_DATA *ext_adv_data;
+/** @brief  Advertising event type of last failed recombination. */
+extern uint16_t fail_event_type;
+/** @brief  Bluetooth device address of last failed recombination. */
+extern uint8_t fail_bd_addr[GAP_BD_ADDR_LEN];
+#endif
+
+/*============================================================================*
+ *                              Functions
+ *============================================================================*/
+/**
+* @brief   Add device information to device list.
+*
+* @param[in] bd_addr Peer device address.
+* @param[in] bd_type Peer device address type.
+* @retval true Success.
+* @retval false Failed, device list is full.
+*/
+bool link_mgr_add_device(uint8_t *bd_addr, uint8_t bd_type);
+
+/**
+ * @brief Clear device list.
+ * @retval void
+ */
+void link_mgr_clear_device_list(void);
+
+#endif