diff --git a/MQTT.py b/MQTT.py
index 313196d..6168895 100644
--- a/MQTT.py
+++ b/MQTT.py
@@ -23,6 +23,7 @@ def valid(msg, client):
     if 'device_name' not in origin_data:
         client.publish('error', payload='device_name must be supplied', qos=0)
         return False
+    client.publish('error', payload=device_name, qos=0)
     if origin_data['device_name'] != device_name:
         return False
     return True
@@ -30,7 +31,7 @@ def valid(msg, client):
 
 # Message receiving callback
 def on_message(client, userdata, msg):
-    if not valid(msg, client):
+    if valid(msg, client) is False:
         client.publish('error', payload='验证失败', qos=0)
         return
     # print("验证通过")