diff --git a/c4ctrl.py b/c4ctrl.py
index 73a388c..b56b925 100755
--- a/c4ctrl.py
+++ b/c4ctrl.py
@@ -42,8 +42,7 @@ from random import choice # for client_id generation.
 class C4Interface: # {{{1
     """ Interaction with AutoC4, the C4 home automation system. """
 
-    #broker = "autoc4.labor.koeln.ccc.de"
-    broker = "172.23.23.110"
+    broker = "autoc4.labor.koeln.ccc.de"
     port = 1883
     qos = 0
     retain = True
@@ -527,13 +526,6 @@ class Dmx7(Dmx): # {{{1
     template = "000000000000ff"
 # }}}1
 
-class Rgb4(Dmx): # {{{1
-    """ Abstraction of the 4 LED doorbell hardware. """
-
-    # 4 times 3 bytes (RGB).
-    template = "00ff0000ff0000ff0000ff00"
-# }}}1
-
 class C4Room: # {{{1
     """ Methods of rooms in the club. """
 
@@ -766,8 +758,7 @@ class Wohnzimmer(C4Room): # {{{1
             Dmx("dmx/wohnzimmer/spuele2"),
             Dmx("dmx/wohnzimmer/tresen"),
             Dmx("dmx/wohnzimmer/tresen2"),
-            Dmx("dmx/wohnzimmer/chaosknoten"),
-            Rgb4("rgb/bell")
+            Dmx("dmx/wohnzimmer/chaosknoten")
         )
 # }}}1
 
@@ -1087,17 +1078,11 @@ is reserved. Please choose a different one.".format(name))
                         # Format payload more nicely.
                         color = light.color
                         if len(color) > 6:
-                            if type(light) == Rgb4:
-                                color = color[:6] + ' ' + color[6:12] + ' ' + color[12:18] + ' ' + color[18:24]
-                            else:
-                                color = color[:6] + ' ' + color[6:]
+                            color = color[:6] + ' ' + color[6:]
                         topic = light.topic.ljust(max_topic_len)
                         # Comment out master, as it would override everything else.
                         if self._topic_is_master(r.topic):
                             fd.write("#{} = {}\n".format(topic, color))
-                        # Also comment out rgb/bell, as it should not usually be set manually.
-                        elif r.topic == "rgb/bell":
-                            fd.write("# Set automatically when club status changes.\n#{} = {}\n".format(topic, color))
                         else:
                             fd.write("{} = {}\n".format(topic, color))