diff --git a/data_upload.py b/data_upload.py
index 05e9d88..2895826 100644
--- a/data_upload.py
+++ b/data_upload.py
@@ -5,6 +5,7 @@ import paho.mqtt.client as mqtt
 
 from device import device_name
 from tool import *
+
 config = configparser.ConfigParser()
 config.read('/home/pi/lot_manager/conf/main/config.conf')
 times = 6
@@ -18,6 +19,7 @@ class DataUploadClient:
         self.username = username
         self.password = password
         self.client = mqtt.Client(client_id=device_name)
+        self.client.username_pw_set(self.username, self.password)
         self.client.on_connect = self.on_connect
         self.client.on_disconnect = self.on_disconnect
 
@@ -32,7 +34,6 @@ class DataUploadClient:
         subprocess.Popen(['/usr/bin/bash /home/pi/lot_manager/bash/stop_data_upload.sh'], shell=True)
 
     def start(self):
-        self.client.username_pw_set(self.username, self.password)
         self.client.connect(self.broker, self.port)
 
 
@@ -53,4 +54,4 @@ if __name__ == '__main__':
             time.sleep(10)
             if times == 0:
                 MQTT.on_disconnect(None, None, None)
-            times -= 1
\ No newline at end of file
+            times -= 1