diff --git a/client/python/karanage/karanage/connection.py b/client/python/karanage/karanage/connection.py
index 190ae49..23346ac 100644
--- a/client/python/karanage/karanage/connection.py
+++ b/client/python/karanage/karanage/connection.py
@@ -11,6 +11,7 @@ from abc import ABC, abstractmethod
 import copy
 import enum
 import json
+from datetime import datetime, timedelta
 from pathlib import Path
 from typing import (
     Dict,
@@ -18,7 +19,7 @@ from typing import (
     NamedTuple,
     Optional,
 )
-
+import time
 import requests
 
 
@@ -240,15 +241,24 @@ class KaranageMock(KaranageConnectionInterface):
         self.request.append(MockData("GET", service, url_offset, None, headers, params))
         return KaranageResponse(f"{service}/{url_offset}", 200, "{}")
 
-    def get_values(self) -> List[KaranageResponse]:
+    def get_values(self, time_out: Optional[float] = None) -> List[KaranageResponse]:
         """get the list of last added values
 
+        :param time_out: Timeout before exiting in error
         :returns: all collected values.
         """
+        if time_out is not None and time_out > 0:
+            start_time = datetime.now()
+            while len(self.request) == 0:
+                time.sleep(0.1)
+                now = datetime.now()
+                if now - start_time > timedelta(seconds=time_out):
+                    return []
         out = self.request
         self.request = []
         return out
 
+
     def clear_values(self) -> None:
         """Clear all the received data."""
         self.request = []