Merge branch 'feature/btdm_prf_task' into feature/btdm_bluedroid

# Conflicts:
#	components/bt/bluedroid/profiles/core/bt_prf_sys_main.c
#	components/bt/bluedroid/profiles/core/bt_prf_task.c
#	components/bt/bluedroid/profiles/core/include/bt_prf_sys.h
#	components/bt/bluedroid/profiles/core/include/bt_prf_task.h
#	components/bt/bluedroid/profiles/esp/include/wx_airsync_prf.h
#	components/bt/bluedroid/profiles/esp/wechat_AirSync/wx_airsync_prf.c
#	components/bt/bluedroid/stack/btm/btm_sec.c

components/bt/bluedroid/stack_api/bt_app_sec.c

@@ -0,0 +1,108 @@
+/**
+ ****************************************************************************************
+ *
+ * @file bt_app_sec.c
+ *
+ * @brief Application entry point
+ *
+ * Copyright (C) Espressif 2016
+ * Created by Yulong at 2016/10/13
+ *
+ *
+ ****************************************************************************************
+ */
+
+#include "bt_app_sec.h"
+#include <stdlib.h>        // standard library
+#include <string.h>
+
+
+
+extern void srand (unsigned int seed);
+extern int random (void);
+
+/// Application Security Environment Structure
+tAPP_SEC_ENV app_sec_env;
+
+
+/*******************************************************************************
+**
+** Function         app_ble_sec_gen_tk
+**
+** Description      This function is called to generate the ble tk 
+**
+** Returns          the generate tk value
+**
+*******************************************************************************/
+UINT32 app_ble_sec_gen_tk(void)
+{
+    // Generate a PIN Code (Between 100000 and 999999)
+    return (100000 + (random()%900000));
+}
+
+/*******************************************************************************
+**
+** Function         app_ble_sec_gen_ltk
+**
+** Description      This function is called to generate the ble ltk 
+**
+** Returns          NULL
+**
+*******************************************************************************/
+void app_ble_sec_gen_ltk(UINT8 key_size)
+{
+    // Counter
+    UINT8 i;
+    app_sec_env.key_size = key_size;
+
+    // Randomly generate the LTK and the Random Number
+    for (i = 0; i < RAND_NB_LEN; i++)
+    {
+        app_sec_env.rand_nb.nb[i] = random()%256;
+    }
+
+    // Randomly generate the end of the LTK
+    for (i = 0; i < SEC_KEY_LEN; i++)
+    {
+        app_sec_env.ltk.key[i] = (((key_size) < (16 - i)) ? 0 : random()%256);
+    }
+
+    // Randomly generate the EDIV
+    app_sec_env.ediv = random()%65536;
+}
+
+
+/*******************************************************************************
+**
+** Function         app_ble_sec_init
+**
+** Description      This function is init the security env and function
+**
+** Returns          NULL
+**
+*******************************************************************************/
+void app_ble_sec_init()
+{
+    // Reset Security Environment
+    memset(&app_sec_env, 0, sizeof(app_sec_env));
+}
+
+
+/*******************************************************************************
+**
+** Function         app_ble_security_start
+**
+** Description      This function is called by the slave when the seurity start 
+**
+** Returns          NULL
+**
+*******************************************************************************/
+void app_ble_security_start(void)
+{
+    
+}
+
+
+
+
+