fix(vd960DBN): BLE 第二分包丢失 — performPeriodicTask 主动拉包 + 发送日志

- 现场: 第一包 93B 正常收到, 第二包 49B 永远收不到 (两包间隔 50ms)
- 根因: 分包续传依赖 poll_dbn_ble 下一轮收包/主循环轮转填充, 与 TMOS 周期交错
- peripheral.c: performPeriodicTask 发完当前包后主动 set_response_to_notify 拉下一分片,
  与收包事件解耦; peripheralChar4Notify 增加 BLE notify OK/FAIL 打印 (发送失败不再静默)
- 隔离测试: 仅靠周期事件驱动, MTU=96 3 周期发出 93B+49B, 重组 130B 一致

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral.c

@@ -684,13 +684,18 @@ static void peripheralStateNotificationCB(gapRole_States_t newState, gapRoleEven
  */
 static void performPeriodicTask(void)
 {
-    // uint8_t notiData[SIMPLEPROFILE_CHAR4_LEN] = {0x88};
-    // peripheralChar4Notify(notiData, SIMPLEPROFILE_CHAR4_LEN);
     if(g_flag_notify_temp){
         g_flag_notify_temp = 0;
         peripheralChar4Notify(g_notify_buftemp.buf, g_notify_buftemp.len);
         clear_ble_notify_buf(&g_notify_buftemp);
     }
+    /* chunk continuation: when notify buf idle and response queue still
+       has more fragments, actively pull next packet here (50ms period),
+       do NOT rely on poll_dbn_ble rx events */
+    if(g_notify_buftemp.flag == 0)
+    {
+        g_flag_notify_temp = set_response_to_notify(&g_buf_ble_response, &g_notify_buftemp);
+    }
 }
 
 /*********************************************************************
@@ -718,8 +723,13 @@ static void peripheralChar4Notify(uint8_t *pValue, uint16_t len)
         tmos_memcpy(noti.pValue, pValue, noti.len);
         if(simpleProfile_Notify(peripheralConnList.connHandle, &noti) != SUCCESS)
         {
+            PRINT("BLE notify FAIL, len:%d, MTU:%d\n", len, peripheralMTU);
             GATT_bm_free((gattMsg_t *)&noti, ATT_HANDLE_VALUE_NOTI);
         }
+        else
+        {
+            PRINT("BLE notify OK, len:%d, MTU:%d\n", len, peripheralMTU);
+        }
     }
 }