SIENTIAPDE-1049Enhance OPC connection handling with error logging and update branch in values.yaml

ingestor/managers/opc_manager.py

@@ -190,11 +190,18 @@ class OpcManager():
         try:
             [self.subscriptions[sub].delete() for sub in self.subscriptions]
             self.logger.warning("Deleted all subscriptions.")
+        except Exception as sub_error:
+            self.logger.error(f"Failed to clean up subscription: {sub_error}")
+
+        try:
+            self.client.disconnect()
+        except Exception as conn_error:
+            self.logger.error(
+                f"Failed to disconnect from OPC UA server: {conn_error}")
+        finally:
             del self.client
             self.client = None
             self.logger.warning("Disconnected from OPC UA server.")
-        except Exception as sub_error:
-            self.logger.error(f"Failed to clean up subscription: {sub_error}")
 
     def datachange_notification(self, node, _val, data):
         """