diff --git a/param_service.egg-info/PKG-INFO b/param_service.egg-info/PKG-INFO
index 20ab0a8..d96d870 100644
--- a/param_service.egg-info/PKG-INFO
+++ b/param_service.egg-info/PKG-INFO
@@ -1,12 +1,8 @@
-Metadata-Version: 2.2
+Metadata-Version: 2.1
 Name: param_service
-Version: 0.2
+Version: 0.2.1
 Summary: Write/Read param from server
 Author: CuiJingwei
 Author-email: cuijingwei@brisonus.com
 Requires-Dist: numpy
 Requires-Dist: PySide6
-Dynamic: author
-Dynamic: author-email
-Dynamic: requires-dist
-Dynamic: summary
diff --git a/param_service.egg-info/SOURCES.txt b/param_service.egg-info/SOURCES.txt
index 8d2e650..10477f5 100644
--- a/param_service.egg-info/SOURCES.txt
+++ b/param_service.egg-info/SOURCES.txt
@@ -1,6 +1,5 @@
 setup.py
 param_service/__init__.py
-param_service/param_manager.py
 param_service/params_service.py
 param_service.egg-info/PKG-INFO
 param_service.egg-info/SOURCES.txt
diff --git a/param_service/params_service.py b/param_service/params_service.py
index 7a1ff60..750f95c 100644
--- a/param_service/params_service.py
+++ b/param_service/params_service.py
@@ -173,7 +173,7 @@ class ParamsService(QObject):
                         "data": request.data
                     }
                     json_data = json.dumps(request_data)
-                    self.socket.write(json_data.encode('utf-8'))
+                    self.socket.write(json_data.encode('utf-8')+b'\0')
                     self.socket.flush()
                 case CMD.SET_PARAMS:
                     self.pending_requests[request.token] = request
@@ -183,7 +183,7 @@ class ParamsService(QObject):
                         "data": request.data
                     }
                     json_data = json.dumps(request_data)
-                    self.socket.write(json_data.encode('utf-8'))
+                    self.socket.write(json_data.encode('utf-8')+b'\0')
                     self.socket.flush()
 
         except Exception as e:
diff --git a/setup.py b/setup.py
index 98983a6..632983d 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@ from setuptools import setup
   
 setup( 
     name='param_service', 
-    version='0.2', 
+    version='0.2.1', 
     description='Write/Read param from server', 
     author='CuiJingwei', 
     author_email='cuijingwei@brisonus.com',