diff --git a/MqttReceiver.py b/MqttReceiver.py
index 273043e..576da47 100644
--- a/MqttReceiver.py
+++ b/MqttReceiver.py
@@ -5,7 +5,7 @@ import json
 import datetime
 
 _parsers = {}
-
+_seenTopics = {}
 
 def on_message(client, userdata, msg):
     try:
@@ -15,6 +15,9 @@ def on_message(client, userdata, msg):
 
         global _parsers
         _parsers[msg.topic].execute(j)
+        
+        global _seenTopics
+        _seenTopics[msg.topic] = datetime.datetime.now()
     except ValueError, e:
         Logger.log("Exception %s in MqttReceiver, on_message" % (str(e)))