code: public void removeConnectionListener(KNXListener l)
  	{
  		synchronized (listeners) {
  			if (listeners.remove(l))
  				listenersCopy = new ArrayList(listeners);
  		}
  	}
docs: /* (non-Javadoc)
  @see tuwien.auto.calimero.knxnetip.KNXnetIPConnection#removeConnectionListener
  (tuwien.auto.calimero.KNXListener)