public void SubscribeConfigurationListener(ISensorConfigurationListener aListener)
        {
            if (aListener == null) {
                throw new ArgumentNullException("aListener");
            }

            if (!listeners.Contains(aListener)) {
                listeners.Add(aListener);
            }
        }
 public void UnsubscribeConfigurationListener(ISensorConfigurationListener aListener)
 {
     if (aListener != null) {
         if (listeners.Contains(aListener)) {
             listeners.Remove(aListener);
         }
     }
 }