diff --git a/nucleo-wb55-ble/Middlewares/ST/STM32_WPAN/ble/svc/Src/p2p_stm.c b/nucleo-wb55-ble/Middlewares/ST/STM32_WPAN/ble/svc/Src/p2p_stm.c
index e60a1e6..1b44b55 100644
--- a/nucleo-wb55-ble/Middlewares/ST/STM32_WPAN/ble/svc/Src/p2p_stm.c
+++ b/nucleo-wb55-ble/Middlewares/ST/STM32_WPAN/ble/svc/Src/p2p_stm.c
@@ -20,7 +20,7 @@
 
 /* Includes ------------------------------------------------------------------*/
 #include "common_blesvc.h"
-
+#include "commands.h"
 /* Private typedef -----------------------------------------------------------*/
 typedef struct{
   uint16_t	PeerToPeerSvcHdle;				        /**< Service handle */
@@ -118,11 +118,14 @@ static SVCCTL_EvtAckStatus_t PeerToPeer_Event_Handler(void *Event)
   {
     case HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE:
     {
+      log_debug("PeerToPeer_Event_Handler", "HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE", 0);
       blecore_evt = (evt_blecore_aci*)event_pckt->data;
       switch(blecore_evt->ecode)
       {
         case ACI_GATT_ATTRIBUTE_MODIFIED_VSEVT_CODE:
        {
+          log_debug("PeerToPeer_Event_Handler", "blecore_evt->ecode=ACI_GATT_ATTRIBUTE_MODIFIED_VSEVT_CODE", 0);
+          log_debug("PeerToPeer_Event_Handler", "aPeerToPeerContext.P2PNotifyServerToClientCharHdle=0x%x", 1, aPeerToPeerContext.P2PNotifyServerToClientCharHdle);
           attribute_modified = (aci_gatt_attribute_modified_event_rp0*)blecore_evt->data;
             if(attribute_modified->Attr_Handle == (aPeerToPeerContext.P2PNotifyServerToClientCharHdle + 2))
             {
diff --git a/nucleo-wb55-dongle-ble/STM32_WPAN/App/app_ble.c b/nucleo-wb55-dongle-ble/STM32_WPAN/App/app_ble.c
index 74410c2..c99d6de 100644
--- a/nucleo-wb55-dongle-ble/STM32_WPAN/App/app_ble.c
+++ b/nucleo-wb55-dongle-ble/STM32_WPAN/App/app_ble.c
@@ -323,7 +323,8 @@ void APP_BLE_Init( void )
 
     /*Radio mask Activity*/
 #if (OOB_DEMO != 0)
-  aci_hal_set_radio_activity_mask(0x0020);
+  aci_hal_set_radio_activity_mask(0x0020); // connection event master
+  log_debug("APP_BLE_Init", "aci_hal_set_radio_activity_mask=0x0020 (connection event master)", 0);
 #endif
   /**
    * Initialize P2P Client Application
@@ -339,6 +340,7 @@ void APP_BLE_Init( void )
    * Start scanning
    */
   UTIL_SEQ_SetTask(1 << CFG_TASK_START_SCAN_ID, CFG_SCH_PRIO_0);
+  log_debug("APP_BLE_Init", "trigger scanning task", 0);
 #endif
 /* USER CODE BEGIN APP_BLE_Init_2 */
   log_debug("APP_BLE_Init", "done", 0);
@@ -391,12 +393,12 @@ SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification( void *pckt )
           {
             /* USER CODE BEGIN GAP_GENERAL_DISCOVERY_PROC */
 
-            log_debug("SVCCTL_App_Notification", "-- GAP GENERAL DISCOVERY PROCEDURE_COMPLETED", 0);
             /* USER CODE END GAP_GENERAL_DISCOVERY_PROC */
-            APP_DBG_MSG("-- GAP GENERAL DISCOVERY PROCEDURE_COMPLETED\n");
+            log_debug("SVCCTL_App_Notification", "-- GAP GENERAL DISCOVERY PROCEDURE_COMPLETED", 0);
             /*if a device found, connect to it, device 1 being chosen first if both found*/
             if (BleApplicationContext.DeviceServerFound == 0x01 && BleApplicationContext.Device_Connection_Status != APP_BLE_CONNECTED_CLIENT)
             {
+              log_debug("SVCCTL_App_Notification", "Set task: CFG_TASK_CONN_DEV_1_ID", 0);
               UTIL_SEQ_SetTask(1 << CFG_TASK_CONN_DEV_1_ID, CFG_SCH_PRIO_0);
             }
           }
@@ -407,6 +409,7 @@ SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification( void *pckt )
         {
           /* USER CODE BEGIN EVT_BLUE_L2CAP_CONNECTION_UPDATE_REQ */
 
+          log_debug("SVCCTL_App_Notification", "Event: ACI_L2CAP_CONNECTION_UPDATE_REQ_VSEVT_CODE", 0);
           /* USER CODE END EVT_BLUE_L2CAP_CONNECTION_UPDATE_REQ */
           aci_l2cap_connection_update_req_event_rp0 *pr = (aci_l2cap_connection_update_req_event_rp0 *) blecore_evt->data;
           aci_hal_set_radio_activity_mask(0x0000);
@@ -504,7 +507,7 @@ SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification( void *pckt )
           BleApplicationContext.Device_Connection_Status = APP_BLE_CONNECTED_CLIENT;
 
           /* CONNECTION WITH CLIENT */
-          APP_DBG_MSG("\r\n\r** CONNECTION EVENT WITH SERVER \n");
+          log_debug("SVCCTL_App_Notification", "** CONNECTION EVENT WITH SERVER", 0);
           handleNotification.P2P_Evt_Opcode = PEER_CONN_HANDLE_EVT;
           handleNotification.ConnectionHandle = BleApplicationContext.BleApplicationContext_legacy.connectionHandle;
           P2PC_APP_Notification(&handleNotification);
@@ -512,12 +515,12 @@ SVCCTL_UserEvtFlowStatus_t SVCCTL_App_Notification( void *pckt )
           result = aci_gatt_disc_all_primary_services(BleApplicationContext.BleApplicationContext_legacy.connectionHandle);
           if (result == BLE_STATUS_SUCCESS)
           {
-            APP_DBG_MSG("\r\n\r** GATT SERVICES & CHARACTERISTICS DISCOVERY  \n");
-            APP_DBG_MSG("* GATT :  Start Searching Primary Services \r\n\r");
+            log_debug("SVCCTL_App_Notification", "** GATT SERVICES & CHARACTERISTICS DISCOVERY", 0);
+            log_debug("SVCCTL_App_Notification", "* GATT :  Start Searching Primary Services", 0);
           }
           else
           {
-            APP_DBG_MSG("BLE_CTRL_App_Notification(), All services discovery Failed \r\n\r");
+            log_error("SVCCTL_App_Notification", "All services discovery Failed", 0);
           }
 
           break; /* HCI_LE_CONNECTION_COMPLETE_SUBEVT_CODE */
@@ -672,17 +675,20 @@ void APP_BLE_Key_Button1_Action(void)
  *************************************************************/
 static void Ble_Tl_Init( void )
 {
+  log_debug("Ble_Tl_Init", "start", 0);
   HCI_TL_HciInitConf_t Hci_Tl_Init_Conf;
 
   Hci_Tl_Init_Conf.p_cmdbuffer = (uint8_t*)&BleCmdBuffer;
   Hci_Tl_Init_Conf.StatusNotCallBack = BLE_StatusNot;
   hci_init(BLE_UserEvtRx, (void*) &Hci_Tl_Init_Conf);
 
+  log_debug("Ble_Tl_Init", "end", 0);
   return;
 }
 
- static void Ble_Hci_Gap_Gatt_Init(void){
+static void Ble_Hci_Gap_Gatt_Init(void){
 
+  log_debug("Ble_Hci_Gap_Gatt_Init", "start", 0);
   uint8_t role;
   uint16_t gap_service_handle, gap_dev_name_char_handle, gap_appearance_char_handle;
   const uint8_t *bd_addr;
@@ -751,6 +757,7 @@ static void Ble_Tl_Init( void )
   {
     const char *name = "Monsun1";
 
+    log_debug("Ble_Hci_Gap_Gatt_Init", "aci_gap_init()", 0);
     aci_gap_init(role, 0,
                  APPBLE_GAP_DEVICE_NAME_LENGTH,
                  &gap_service_handle, &gap_dev_name_char_handle, &gap_appearance_char_handle);
@@ -761,14 +768,15 @@ static void Ble_Tl_Init( void )
     }
   }
 
-    if(aci_gatt_update_char_value(gap_service_handle,
-                                  gap_appearance_char_handle,
-                                  0,
-                                  2,
-                                 (uint8_t *)&appearance))
-    {
-      BLE_DBG_SVCCTL_MSG("Appearance aci_gatt_update_char_value failed.\n");
-    }
+  log_debug("Ble_Hci_Gap_Gatt_Init", "aci_gatt_update_char_value()", 0);
+  if(aci_gatt_update_char_value(gap_service_handle,
+                                gap_appearance_char_handle,
+                                0,
+                                2,
+                                (uint8_t *)&appearance))
+  {
+    BLE_DBG_SVCCTL_MSG("Appearance aci_gatt_update_char_value failed.\n");
+  }
 
     /**
      * Initialize IO capability
@@ -786,6 +794,7 @@ static void Ble_Tl_Init( void )
     BleApplicationContext.BleApplicationContext_legacy.bleSecurityParam.Fixed_Pin = CFG_FIXED_PIN;
     BleApplicationContext.BleApplicationContext_legacy.bleSecurityParam.bonding_mode = CFG_BONDING_MODE;
 
+    log_debug("Ble_Hci_Gap_Gatt_Init", "aci_gap_set_authentication_requirement()", 0);
     aci_gap_set_authentication_requirement(BleApplicationContext.BleApplicationContext_legacy.bleSecurityParam.bonding_mode,
                                            BleApplicationContext.BleApplicationContext_legacy.bleSecurityParam.mitm_mode,
                                            CFG_SC_SUPPORT,
@@ -802,16 +811,18 @@ static void Ble_Tl_Init( void )
      */
     if (BleApplicationContext.BleApplicationContext_legacy.bleSecurityParam.bonding_mode)
     {
+      log_debug("Ble_Hci_Gap_Gatt_Init", "aci_gap_configure_whitelist()", 0);
       aci_gap_configure_whitelist();
     }
 
+  log_debug("Ble_Hci_Gap_Gatt_Init", "end", 0);
 }
 
 static void Scan_Request( void )
 {
   /* USER CODE BEGIN Scan_Request_1 */
 
-  log_debug("Scan_Request", "enter", 0);
+  log_debug("Scan_Request", "start", 0);
   /* USER CODE END Scan_Request_1 */
   tBleStatus result;
   if (BleApplicationContext.Device_Connection_Status != APP_BLE_CONNECTED_CLIENT)
@@ -819,22 +830,21 @@ static void Scan_Request( void )
     /* USER CODE BEGIN APP_BLE_CONNECTED_CLIENT */
 
     /* USER CODE END APP_BLE_CONNECTED_CLIENT */
+    log_debug("Scan_Request", "aci_gap_start_general_discovery_proc()", 0);
     result = aci_gap_start_general_discovery_proc(SCAN_P, SCAN_L, PUBLIC_ADDR, 1);
     if (result == BLE_STATUS_SUCCESS)
     {
     /* USER CODE BEGIN BLE_SCAN_SUCCESS */
 
-      log_debug("Scan_Request", "START GENERAL DISCOVERY (SCAN)", 0);
     /* USER CODE END BLE_SCAN_SUCCESS */
-      APP_DBG_MSG(" \r\n\r** START GENERAL DISCOVERY (SCAN) **  \r\n\r");
+      log_debug("Scan_Request", "** START GENERAL DISCOVERY (SCAN) **", 0);
     }
     else
     {
     /* USER CODE BEGIN BLE_SCAN_FAILED */
 
-    log_debug("Scan_Request", "BLE_App_Start_Limited_Disc_Req, Failed", 0);
     /* USER CODE END BLE_SCAN_FAILED */
-      APP_DBG_MSG("-- BLE_App_Start_Limited_Disc_Req, Failed \r\n\r");
+      log_debug("Scan_Request", "-- BLE_App_Start_Limited_Disc_Req, Failed ", 0);
     }
   }
   /* USER CODE BEGIN Scan_Request_2 */
@@ -847,14 +857,15 @@ static void Connect_Request( void )
 {
   /* USER CODE BEGIN Connect_Request_1 */
 
-  log_debug("Scan_Request", "enter", 0);
+  log_debug("Connect_Request", "start", 0);
   /* USER CODE END Connect_Request_1 */
   tBleStatus result;
 
-  APP_DBG_MSG("\r\n\r** CREATE CONNECTION TO SERVER **  \r\n\r");
+  log_debug("Connect_Request", "** CREATE CONNECTION TO SERVER **", 0);
 
   if (BleApplicationContext.Device_Connection_Status != APP_BLE_CONNECTED_CLIENT)
   {
+    log_debug("Connect_Request", "aci_gap_create_connection()", 0);
     result = aci_gap_create_connection(SCAN_P,
                                        SCAN_L,
                                        PUBLIC_ADDR, SERVER_REMOTE_BDADDR,
@@ -871,6 +882,7 @@ static void Connect_Request( void )
     /* USER CODE BEGIN BLE_CONNECT_SUCCESS */
 
     /* USER CODE END BLE_CONNECT_SUCCESS */
+    log_debug("Device_Connection_Status", "APP_BLE_LP_CONNECTING", 0);
     BleApplicationContext.Device_Connection_Status = APP_BLE_LP_CONNECTING;
 
     }
@@ -879,6 +891,8 @@ static void Connect_Request( void )
     /* USER CODE BEGIN BLE_CONNECT_FAILED */
 
     /* USER CODE END BLE_CONNECT_FAILED */
+      log_error("Connect_Request", "Connection failed", 0);
+      log_debug("Device_Connection_Status", "APP_BLE_IDLE", 0);
       BleApplicationContext.Device_Connection_Status = APP_BLE_IDLE;
 
     }
@@ -892,11 +906,13 @@ static void Connect_Request( void )
 static void Switch_OFF_GPIO(){
 /* USER CODE BEGIN Switch_OFF_GPIO */
 
+  log_debug("Switch_OFF_GPIO", "start/end", 0);
 /* USER CODE END Switch_OFF_GPIO */
 }
 
 const uint8_t* BleGetBdAddress( void )
 {
+  log_debug("BleGetBdAddress", "start", 0);
   uint8_t *otp_addr;
   const uint8_t *bd_addr;
   uint32_t udn;
@@ -940,6 +956,7 @@ const uint8_t* BleGetBdAddress( void )
     }
   }
 
+  log_debug("BleGetBdAddress", "end", 0);
   return bd_addr;
 }
 /* USER CODE BEGIN FD_LOCAL_FUNCTIONS */
@@ -970,6 +987,7 @@ void hci_cmd_resp_wait(uint32_t timeout)
 
 static void BLE_UserEvtRx( void * pPayload )
 {
+  // log_debug("BLE_UserEvtRx", "start", 0);
   SVCCTL_UserEvtFlowStatus_t svctl_return_status;
   tHCI_UserEvtRxParam *pParam;
 
@@ -984,10 +1002,12 @@ static void BLE_UserEvtRx( void * pPayload )
 {
     pParam->status = HCI_TL_UserEventFlow_Disable;
   }
+  // log_debug("BLE_UserEvtRx", "end", 0);
 }
 
 static void BLE_StatusNot( HCI_TL_CmdStatus_t status )
 {
+  // log_debug("BLE_StatusNot", "start", 0);
   uint32_t task_id_list;
   switch (status)
   {
@@ -1014,6 +1034,7 @@ static void BLE_StatusNot( HCI_TL_CmdStatus_t status )
     default:
       break;
   }
+  // log_debug("BLE_StatusNot", "end", 0);
   return;
 }
 
diff --git a/nucleo-wb55-dongle-ble/STM32_WPAN/App/p2p_client_app.c b/nucleo-wb55-dongle-ble/STM32_WPAN/App/p2p_client_app.c
index 035f436..c7bef4a 100644
--- a/nucleo-wb55-dongle-ble/STM32_WPAN/App/p2p_client_app.c
+++ b/nucleo-wb55-dongle-ble/STM32_WPAN/App/p2p_client_app.c
@@ -20,6 +20,7 @@
 
 /* Includes ------------------------------------------------------------------*/
 
+#include <stdio.h>
 #include "main.h"
 #include "app_common.h"
 
@@ -176,7 +177,7 @@ void P2PC_APP_Init(void)
 {
   uint8_t index =0;
 /* USER CODE BEGIN P2PC_APP_Init_1 */
-  log_debug("P2PC_APP_Init", "enter", 0);
+  log_debug("P2PC_APP_Init", "start", 0);
   UTIL_SEQ_RegTask( 1<< CFG_TASK_SEARCH_SERVICE_ID, UTIL_SEQ_RFU, Update_Service );
   UTIL_SEQ_RegTask( 1<< CFG_TASK_SW1_BUTTON_PUSHED_ID, UTIL_SEQ_RFU, Button_Trigger_Received );
 
@@ -190,6 +191,7 @@ void P2PC_APP_Init(void)
   P2P_Client_App_Context.LedControl.Led1=0x00; /* led OFF */
   P2P_Client_App_Context.ButtonStatus.Device_Button_Selection=0x01;/* Device1 */
   P2P_Client_App_Context.ButtonStatus.Button1=0x00;
+  log_debug("P2PC_APP_Init", "BLE_CFG_CLT_MAX_NBR_CB=%d", 1, BLE_CFG_CLT_MAX_NBR_CB);
 /* USER CODE END P2PC_APP_Init_1 */
   for(index = 0; index < BLE_CFG_CLT_MAX_NBR_CB; index++)
   {
@@ -207,6 +209,7 @@ void P2PC_APP_Init(void)
 
 /* USER CODE BEGIN P2PC_APP_Init_2 */
 
+  log_debug("P2PC_APP_Init", "end", 0);
 /* USER CODE END P2PC_APP_Init_2 */
   return;
 }
@@ -214,7 +217,7 @@ void P2PC_APP_Init(void)
 void P2PC_APP_Notification(P2PC_APP_ConnHandle_Not_evt_t *pNotification)
 {
 /* USER CODE BEGIN P2PC_APP_Notification_1 */
-  log_debug("P2PC_APP_Notification", "enter", 0);
+  log_debug("P2PC_APP_Notification", "start", 0);
 /* USER CODE END P2PC_APP_Notification_1 */
   switch(pNotification->P2P_Evt_Opcode)
   {
@@ -224,13 +227,15 @@ void P2PC_APP_Notification(P2PC_APP_ConnHandle_Not_evt_t *pNotification)
 
   case PEER_CONN_HANDLE_EVT :
 /* USER CODE BEGIN PEER_CONN_HANDLE_EVT */
+    log_debug("P2PC_APP_Notification", "PEER_CONN_HANDLE_EVT", 0);
     P2P_Client_App_Context.ConnectionHandle = pNotification->ConnectionHandle;
 /* USER CODE END PEER_CONN_HANDLE_EVT */
-      break;
+    break;
 
     case PEER_DISCON_HANDLE_EVT :
 /* USER CODE BEGIN PEER_DISCON_HANDLE_EVT */
       {
+      log_debug("P2PC_APP_Notification", "PEER_DISCON_HANDLE_EVT", 0);
       uint8_t index = 0;
       P2P_Client_App_Context.ConnectionHandle =  0x00;
       while((index < BLE_CFG_CLT_MAX_NBR_CB) &&
@@ -261,6 +266,7 @@ void P2PC_APP_Notification(P2PC_APP_ConnHandle_Not_evt_t *pNotification)
 /* USER CODE BEGIN FD */
 void P2PC_APP_SW1_Button_Action(void)
 {
+  log_debug("P2PC_APP_SW1_Button_Action", "set task: BLE_CFG_CLT_MAX_NBR_CB", 0);
   UTIL_SEQ_SetTask(1<<CFG_TASK_SW1_BUTTON_PUSHED_ID, CFG_SCH_PRIO_0);
 }
 /* USER CODE END FD */
@@ -282,7 +288,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
   hci_event_pckt *event_pckt;
   evt_blecore_aci *blecore_evt;
 
-  log_debug("Event_Handler", "enter", 0);
+  log_debug("Event_Handler", "start", 0);
   P2P_Client_App_Notification_evt_t Notification;
 
   return_value = SVCCTL_EvtNotAck;
@@ -292,12 +298,14 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
   {
     case HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE:
     {
+      // log_debug("Event_Handler", "HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE", 0);
       blecore_evt = (evt_blecore_aci*)event_pckt->data;
       switch(blecore_evt->ecode)
       {
 
         case ACI_ATT_READ_BY_GROUP_TYPE_RESP_VSEVT_CODE:
         {
+          log_debug("Event_Handler", "blecore_evt->ecode=ACI_ATT_READ_BY_GROUP_TYPE_RESP_VSEVT_CODE", 0);
           aci_att_read_by_group_type_resp_event_rp0 *pr = (void*)blecore_evt->data;
           uint8_t numServ, i, idx;
           uint16_t uuid, handle;
@@ -315,7 +323,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
             if((aP2PClientContext[index].state == APP_BLE_CONNECTED_CLIENT)&&
                     (status == APP_BLE_IDLE))
             {
-              /* Handle deconnected */
+              /* Handle disconnected */
 
               aP2PClientContext[index].state = APP_BLE_IDLE;
               aP2PClientContext[index].connHandle = 0xFFFF;
@@ -351,16 +359,23 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
                 uuid = UNPACK_2_BYTE_PARAMETER(&pr->Attribute_Data_List[idx]);
                 if(uuid == P2P_SERVICE_UUID)
                 {
+                  log_debug("Event_Handler", "uuid=0x%x", 1, uuid);
+                  log_debug("Event_Handler", "-- GATT : P2P_SERVICE_UUID FOUND - connection handle=0x%x", 1, aP2PClientContext[index].connHandle);
 #if(CFG_DEBUG_APP_TRACE != 0)
                   APP_DBG_MSG("-- GATT : P2P_SERVICE_UUID FOUND - connection handle 0x%x \n", aP2PClientContext[index].connHandle);
 #endif
 #if (UUID_128BIT_FORMAT==1)
+                /*
+                | 2 byte             | 2 byte                 | 14 byte | 2 byte |
+                | p2p service handle | p2p service end handle | ????    | uuid   |
+                */
                 aP2PClientContext[index].P2PServiceHandle = UNPACK_2_BYTE_PARAMETER(&pr->Attribute_Data_List[idx-16]);
                 aP2PClientContext[index].P2PServiceEndHandle = UNPACK_2_BYTE_PARAMETER (&pr->Attribute_Data_List[idx-14]);
 #else
                 aP2PClientContext[index].P2PServiceHandle = UNPACK_2_BYTE_PARAMETER(&pr->Attribute_Data_List[idx-4]);
                 aP2PClientContext[index].P2PServiceEndHandle = UNPACK_2_BYTE_PARAMETER (&pr->Attribute_Data_List[idx-2]);
 #endif
+                  log_debug("Event_Handler", "aP2PClientContext.state=APP_BLE_DISCOVER_CHARACS", 0);
                   aP2PClientContext[index].state = APP_BLE_DISCOVER_CHARACS ;
                 }
                 idx += 6;
@@ -373,6 +388,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
         case ACI_ATT_READ_BY_TYPE_RESP_VSEVT_CODE:
         {
 
+          log_debug("Event_Handler", "blecore_evt->ecode=ACI_ATT_READ_BY_TYPE_RESP_VSEVT_CODE", 0);
           aci_att_read_by_type_resp_event_rp0 *pr = (void*)blecore_evt->data;
           uint8_t idx;
           uint16_t uuid, handle;
@@ -406,6 +422,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
               pr->Data_Length -= 1;
               while(pr->Data_Length > 0)
               {
+                log_debug("Event_Handler", "uuid=0x%x", 1, uuid);
                 uuid = UNPACK_2_BYTE_PARAMETER(&pr->Handle_Value_Pair_Data[idx]);
                 /* store the characteristic handle not the attribute handle */
 #if (UUID_128BIT_FORMAT==1)
@@ -415,6 +432,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 #endif
                 if(uuid == P2P_WRITE_CHAR_UUID)
                 {
+                  log_debug("Event_Handler", "-- GATT : WRITE_UUID FOUND - connection handle=0x%x", 1, aP2PClientContext[index].connHandle);
 #if(CFG_DEBUG_APP_TRACE != 0)
                   APP_DBG_MSG("-- GATT : WRITE_UUID FOUND - connection handle 0x%x\n", aP2PClientContext[index].connHandle);
 #endif
@@ -424,6 +442,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
                 else if(uuid == P2P_NOTIFY_CHAR_UUID)
                 {
+                  log_debug("Event_Handler", "-- GATT : NOTIFICATION_CHAR_UUID FOUND - connection handle=0x%x", 1, aP2PClientContext[index].connHandle);
 #if(CFG_DEBUG_APP_TRACE != 0)
                   APP_DBG_MSG("-- GATT : NOTIFICATION_CHAR_UUID FOUND  - connection handle 0x%x\n", aP2PClientContext[index].connHandle);
 #endif
@@ -445,6 +464,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
         case ACI_ATT_FIND_INFO_RESP_VSEVT_CODE:
         {
+          log_debug("Event_Handler", "blecore_evt->ecode=ACI_ATT_FIND_INFO_RESP_VSEVT_CODE", 0);
           aci_att_find_info_resp_event_rp0 *pr = (void*)blecore_evt->data;
 
           uint8_t numDesc, idx, i;
@@ -479,6 +499,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
                 if(uuid == CLIENT_CHAR_CONFIG_DESCRIPTOR_UUID)
                 {
+                  log_debug("Event_Handler", "-- GATT : CLIENT_CHAR_CONFIG_DESCRIPTOR_UUID FOUND - connection handle=0x%x", 1, aP2PClientContext[index].connHandle);
 #if(CFG_DEBUG_APP_TRACE != 0)
                   APP_DBG_MSG("-- GATT : CLIENT_CHAR_CONFIG_DESCRIPTOR_UUID- connection handle 0x%x\n", aP2PClientContext[index].connHandle);
 #endif
@@ -499,6 +520,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
         case ACI_GATT_NOTIFICATION_VSEVT_CODE:
         {
+          log_debug("Event_Handler", "blecore_evt->ecode=ACI_GATT_NOTIFICATION_VSEVT_CODE", 0);
           aci_gatt_notification_event_rp0 *pr = (void*)blecore_evt->data;
           uint8_t index;
 
@@ -509,6 +531,15 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
           if(index < BLE_CFG_CLT_MAX_NBR_CB)
           {
+            uint8_t buffer[512];
+            buffer[0] = (uint8_t)('0');
+            buffer[1] = (uint8_t)('x');
+            uint8_t i;
+            for (i = 0; i<pr->Attribute_Value_Length; i++) {
+              snprintf((char*)(buffer + i + 2), 512-i-2, "%x", pr->Attribute_Value[i]);
+            }
+            buffer[i + 2] = (uint8_t)('\0');
+            log_debug("Event_Handler", "Notification payload: %s", 1, buffer);
 
             if ( (pr->Attribute_Handle == aP2PClientContext[index].P2PNotificationCharHdle) &&
                     (pr->Attribute_Value_Length == (2)) )
@@ -529,6 +560,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
 
         case ACI_GATT_PROC_COMPLETE_VSEVT_CODE:
         {
+          log_debug("Event_Handler", "blecore_evt->ecode=ACI_GATT_PROC_COMPLETE_VSEVT_CODE", 0);
           aci_gatt_proc_complete_event_rp0 *pr = (void*)blecore_evt->data;
 #if(CFG_DEBUG_APP_TRACE != 0)
           APP_DBG_MSG("-- GATT : ACI_GATT_PROC_COMPLETE_VSEVT_CODE \n");
@@ -561,6 +593,7 @@ static SVCCTL_EvtAckStatus_t Event_Handler(void *Event)
       break;
   }
 
+  log_debug("Event_Handler", "end", 0);
   return(return_value);
 }/* end BLE_CTRL_Event_Acknowledged_Status_t */
 
diff --git a/out/ble-client-seq/ble-client-seq.svg b/out/ble-client-seq/ble-client-seq.svg
new file mode 100644
index 0000000..14f49fa
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y="881.7988">UTIL_SEQ_WaitEvt(CFG_IDLEEVT_SYSTEM_HCI_CMD_EVT_RSP_ID)</text><rect fill="#EEEEEE" filter="url(#f13wvxyjqlsxu6)" height="3" style="stroke:#EEEEEE;stroke-width:1.0;" width="2179" x="0" y="915.1963"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="2179" y1="915.1963" y2="915.1963"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="2179" y1="918.1963" y2="918.1963"/><rect fill="#EEEEEE" filter="url(#f13wvxyjqlsxu6)" height="23.3105" style="stroke:#000000;stroke-width:2.0;" width="45" x="1067" y="904.541"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="27" x="1073" y="921.1094">INIT</text><polygon fill="#A80036" points="1190.5,955.1621,1200.5,959.1621,1190.5,963.1621,1194.5,959.1621" style="stroke:#A80036;stroke-width:1.0;"/><line style="stroke:#A80036;stroke-width:1.0;" x1="123" x2="1196.5" y1="959.1621" y2="959.1621"/><text fill="#000000" font-family="sans-serif" font-size="13" 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style="stroke:#A80036;stroke-width:1.0;" x1="1254.5" x2="1254.5" y1="1543.752" y2="1556.752"/><line style="stroke:#A80036;stroke-width:1.0;" x1="1207.5" x2="1254.5" y1="1556.752" y2="1556.752"/><polygon fill="#A80036" points="1217.5,1552.752,1207.5,1556.752,1217.5,1560.752,1213.5,1556.752" style="stroke:#A80036;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="124" x="1219.5" y="1539.0098">UTIL_SEQ_PostIdle()</text><!--MD5=[20b1ded2585c39da35a47d2fec39af48]
+@startuml
+== Button pressed ==
+participant unknown as uk
+participant main
+participant interrupt as it
+participant app_entry
+participant app_ble
+participant p2p_client_app
+participant stm32_seq
+it -> app_entry : HAL_GPIO_EXTI_Callback()
+app_entry -> app_ble : APP_BLE_Key_Button1_Action()
+app_ble -> p2p_client_app : P2PC_APP_SW1_Button_Action()
+p2p_client_app -> stm32_seq : UTIL_SEQ_SetTask(CFG_TASK_SW1_BUTTON_PUSHED_ID)
+
+...waiting for task gets executed....
+
+stm32_seq -> p2p_client_app : Button_Trigger_Received()
+p2p_client_app -> p2p_client_app : toggleButtonStatus()
+p2p_client_app -> p2p_client_app : Write_Char(P2P_WRITE_CHAR_UUID, 0, buttonStatus)
+activate p2p_client_app
+p2p_client_app -> "?b" : aci_gatt_write_without_resp()
+deactivate p2p_client_app
+
+== Event received ==
+"?a" -> p2p_client_app : Event_Handler()
+activate p2p_client_app
+opt event == HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE
+opt event->core_event == ACI_GATT_PROC_COMPLETE_VSEVT_CODE
+opt aP2PClientContext[index].connHandle != pr->Connection_Handle
+p2p_client_app -> stm32_seq : UTIL_SEQ_SetTask(CFG_TASK_SEARCH_SERVICE_ID)
+end
+end
+end
+deactivate p2p_client_app
+
+...waiting for task gets executed....
+
+stm32_seq -> p2p_client_app : Update_Service()
+
+......
+uk -> app_entry : UTIL_SEQ_Idle()
+uk -> app_entry : shci_notify_asynch_evt()
+activate app_entry
+    app_entry -> stm32_seq : UTIL_SEQ_SetTask(CFG_TASK_SYSTEM_HCI_ASYNCH_EVT_ID)
+deactivate app_entry
+uk -> app_entry : shci_cmd_resp_release()
+activate app_entry
+    app_entry -> stm32_seq : UTIL_SEQ_SetEvt(CFG_IDLEEVT_SYSTEM_HCI_CMD_EVT_RSP_ID)
+deactivate app_entry
+uk -> app_entry : shci_cmd_resp_wait()
+activate app_entry
+    app_entry -> stm32_seq : UTIL_SEQ_WaitEvt(CFG_IDLEEVT_SYSTEM_HCI_CMD_EVT_RSP_ID)
+deactivate app_entry
+
+== INIT ==
+main -> stm32_seq : UTIL_SEQ_Run(UTIL_SEQ_DEFAULT)
+activate stm32_seq
+stm32_seq -> shci_tl : shci_user_evt_proc()
+    activate shci_tl
+    shci_tl -> app_entry : APPE_SysUserEvtRx()
+        activate app_entry
+        app_entry -> app_debug : APPD_EnableCPU2()
+        app_entry -> app_ble : APP_BLE_Init()
+            activate app_ble
+            app_ble -> app_ble : Ble_Tl_Init()
+            app_ble -> stm32_seq : UTIL_SEQ_RegTask(CFG_TASK_HCI_ASYNCH_EVT_ID, UTIL_SEQ_RFU, hci_user_evt_proc)
+            app_ble -> shci : SHCI_C2_BLE_Init()
+            app_ble -> app_ble : Ble_Hci_Gap_Gatt_Init()
+            app_ble -> svc_ctl : SVCCTL_Init()
+            app_ble -> stm32_seq : UTIL_SEQ_RegTask(CFG_TASK_START_SCAN_ID, UTIL_SEQ_RFU, Scan_Request)
+            app_ble -> stm32_seq : UTIL_SEQ_RegTask(CFG_TASK_CONN_DEV_1_ID, UTIL_SEQ_RFU, Connect_Request)
+            app_ble -> uk : aci_hal_set_radio_activity_mask()
+            app_ble -> app_p2p_client : P2PC_APP_Init()
+                activate app_p2p_client
+                app_p2p_client -> svc_ctl : SVCCTL_RegisterCltHandler(Event_Handler)
+                deactivate app_p2p_client
+            app_ble -> hw_timeserver : HW_TS_Create(CFG_TIM_PROC_ID_ISR, &(BleApplicationContext.SwitchOffGPIO_timer_Id), hw_ts_SingleShot, Switch_OFF_GPIO)
+            deactivate app_ble
+        deactivate app_entry
+    deactivate shci_tl
+stm32_seq -> stm32_seq : UTIL_SEQ_PreIdle()
+stm32_seq -> stm32_seq : UTIL_SEQ_Idle()
+stm32_seq -> stm32_seq : UTIL_SEQ_PostIdle()
+deactivate stm32_seq
+@enduml
+
+PlantUML version 1.2021.7(Sun May 23 14:40:07 CEST 2021)
+(GPL source distribution)
+Java Runtime: Java(TM) SE Runtime Environment
+JVM: Java HotSpot(TM) 64-Bit Server VM
+Default Encoding: UTF-8
+Language: en
+Country: GB
+--></g></svg>
\ No newline at end of file
diff --git a/request-sequence-diagram.puml b/request-sequence-diagram.puml
new file mode 100644
index 0000000..f749635
--- /dev/null
+++ b/request-sequence-diagram.puml
@@ -0,0 +1,33 @@
+@startuml
+participant backend as be
+participant usb_receive as usb_r
+participant command_exucutor as ce
+participant Request as req
+participant Response as resp
+
+be -> usb_r : send command()
+usb_r -> ce : enqueue command()
+ce -> req : execute()
+activate req
+    req -> req : interpret_request()
+    req -> req : execute_request()
+    activate req
+        create resp
+        req -> resp : new
+        activate resp
+            req -> resp : execute()
+            resp -> resp : set_payload()
+            activate resp
+                resp -> resp : set_response_payload()
+                activate resp
+                resp --> resp : response_payload_size
+                deactivate resp
+            resp --> resp : payload_size
+            deactivate resp
+        resp --> req : was_successful
+        deactivate resp
+    req --> req : was_successful
+    deactivate req
+req --> ce : was_successful
+deactivate req
+@enduml
\ No newline at end of file