修改UCD连接需要重启错误

app/ucd/device.py

@@ -111,6 +111,12 @@ class _UcdSdkBackend:
 
     def search_device(self):
         """搜索可用设备"""
+        self._ensure_tsi_lib()
+        try:
+            self.lUniTAP.rescan_devices()
+        except Exception:
+            log.exception("UcdSdk.search_device rescan failed; reinitializing TsiLib")
+            self._reinit_tsi_lib()
         available_devices = self.lUniTAP.get_list_of_available_devices()
         return available_devices if available_devices else []
 
@@ -122,6 +128,13 @@ class _UcdSdkBackend:
             if self.dev is not None or self.status:
                 self._force_cleanup()
 
+            self._ensure_tsi_lib()
+            try:
+                self.lUniTAP.rescan_devices()
+            except Exception:
+                log.exception("UcdSdk.open rescan failed; reinitializing TsiLib")
+                self._reinit_tsi_lib()
+
             device_id = int(device_name.split(":")[0])
             temp_dev = self.lUniTAP.open(device_id)
 
@@ -144,6 +157,7 @@ class _UcdSdkBackend:
 
         except Exception as e:
             self._force_cleanup()
+            self._reinit_tsi_lib()
             return False
 
     def close(self):
@@ -157,30 +171,29 @@ class _UcdSdkBackend:
                 self._close_device_object(self.dev)
 
             self._reset_state()
-            self.lUniTAP = None
-
-            for i in range(3):
-                gc.collect()
-
-            time.sleep(2.0)
-
-            self.lUniTAP = UniTAP.TsiLib()
-
+            self._reinit_tsi_lib()
             return True
 
         except Exception as e:
             self._reset_state()
-
             try:
-                self.lUniTAP = None
-                gc.collect()
-                time.sleep(2.0)
-                self.lUniTAP = UniTAP.TsiLib()
-            except Exception as init_error:
+                self._reinit_tsi_lib()
+            except Exception:
                 pass
-
             return False
 
+    def _ensure_tsi_lib(self) -> None:
+        if self.lUniTAP is None:
+            self.lUniTAP = UniTAP.TsiLib()
+
+    def _reinit_tsi_lib(self) -> None:
+        """Destroy and recreate TsiLib so the native driver rescans USB devices."""
+        self.lUniTAP = None
+        for _ in range(3):
+            gc.collect()
+        time.sleep(2.0)
+        self.lUniTAP = UniTAP.TsiLib()
+
     def _reset_state(self):
         """重置所有运行时状态（不关闭设备句柄）"""
         self.dev = None