code: private void deliverDeviceUpdate(final DeviceUpdate update) {
          for (DeviceUpdateListener listener : getUpdateListeners()) {
              try {
                  listener.received(update);
              } catch (Throwable t) {
                  logger.warn("Problem delivering device update to listener", t);
              }
          }
      }
docs: Send a device update to all registered update listeners.
  
  @param update the device update that has just arrived