debug(vd960DBN): 抓现行打印 — 发送前队列状态 + resp flag 变化沿

- 心跳证实: 第一包发出后 resp=0 amt=0, 队列已被意外清空 (第二包不存在)
- poll_dbn_ble 尾部: resp flag 变化沿打印 (0->1/1->0 各一次, 不刷屏)
- performPeriodicTask: 发送前打印 len + resp 队列状态
- 烧录后一次看清 谁在何时清了 g_buf_ble_response

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/dbn_ble_srv.c

@@ -1053,8 +1053,17 @@ void poll_dbn_ble(void)
     }
     if(g_notify_buftemp.flag == 0)
     {
-//        report_sens_acs();
-        g_flag_notify_temp = set_response_to_notify(&g_buf_ble_response, &g_notify_buftemp);
+        static uint8_t _last_resp_flag = 0;
+        uint8_t _pull = set_response_to_notify(&g_buf_ble_response, &g_notify_buftemp);
+        g_flag_notify_temp = _pull;
+        if(g_buf_ble_response.flag != _last_resp_flag)
+        {
+            PRINT("BLE resp flag %d->%d (pull=%d amt=%d seq=%d off=%d)\n",
+                   _last_resp_flag, g_buf_ble_response.flag, _pull,
+                   g_buf_ble_response.pkg_amount, g_buf_ble_response.pkg_seq,
+                   g_buf_ble_response.dat_offset);
+            _last_resp_flag = g_buf_ble_response.flag;
+        }
     }
 }