diff --git a/v2/transmitter.py b/v2/transmitter.py
index 746dc29..35cb0e1 100644
--- a/v2/transmitter.py
+++ b/v2/transmitter.py
@@ -33,6 +33,7 @@ class Transmitter:
                 yield tb, buffer
             elif p['ts'] + p['time_out'] <= ts:
                 # 保持连接
+                print('保持连接')
                 self.db_client.execute('select 1')
 
     @staticmethod