code: public static ZWaveCommandClass getInstance(int i, ZWaveNode node, ZWaveController controller) {
  		return ZWaveCommandClass.getInstance(i, node, controller, null);
  	}
docs: Gets an instance of the right command class.
  Returns null if the command class is not found.
  @param i the code to instantiate
  @param node the node this instance commands.
  @param controller the controller to send messages to.
  @return the ZWaveCommandClass instance that was instantiated, null otherwise