diff --git a/app.py b/app.py
index f17f146..fbbcdaa 100644
--- a/app.py
+++ b/app.py
@@ -245,4 +245,4 @@ def deactivate_token(token):
 
 
 if __name__ == '__main__':
-    app.run()
+    app.run(host='0.0.0.0')
diff --git a/door_handle.py b/door_handle.py
index 09f41d4..36a6b37 100644
--- a/door_handle.py
+++ b/door_handle.py
@@ -1,14 +1,13 @@
 import paho.mqtt.client as mqtt
-import re
 
 
 class DoorHandle:
-    def __init__(self, host, port=1883):
+    def __init__(self, host, port=1883, token_file='/etc/door_tokens'):
         self.state = None
         self.encoder_position = None
+        self.last_invalid = {}
 
-        self.token_file = 'door_tokens'
-        self.nfc_logfile = 'nfc.log'
+        self.token_file = token_file
 
         self.mqtt_client = mqtt.Client()
         self.mqtt_client.on_connect = self.on_connect
@@ -33,6 +32,9 @@ class DoorHandle:
             self.state = msg.payload.decode()
         elif msg.topic == 'door/position/value':
             self.encoder_position = int(msg.payload)
+        elif msg.topic == 'token/last_invalid':
+            timestamp, token = msg.payload.split(';')
+            self.last_invalid = {'token': token, 'timestamp': timestamp}
 
     def get_tokens(self):
         tokens = {}
@@ -68,11 +70,5 @@ class DoorHandle:
             f.write(output)
 
 
-
     def get_most_recent_token(self):
-        # read last invalid token from logfile
-        with open(self.nfc_logfile) as f:
-            nfc_log = f.read()
-            match = re.search(r"(?P<date>\d{4}-\d{2}-\d{2}) (?P<time>\d{2}:\d{2}:\d{2}) Invalid token: (?P<token>[[:xdigit:]]{14})",
-                          nfc_log, re.REVERSE)
-            return match
+        return self.last_invalid
diff --git a/templates/register.html b/templates/register.html
index 8fc3772..a38664d 100644
--- a/templates/register.html
+++ b/templates/register.html
@@ -18,7 +18,7 @@
 {% endwith %}
 {% if token is not none %}
     Letzter unregistrierter Token: {{ token['token'] }} <br>
-    Gelesen am {{ token['date'] }} um {{ token['time'] }}
+    Timestamp {{ token['timestamp'] }}
 
     <div>
     <p>
@@ -78,4 +78,4 @@
         });
     });
 </script>
-</html>
\ No newline at end of file
+</html>