code: public void addCommandClass(ZWaveCommandClass commandClass) {
  		ZWaveCommandClass.CommandClass key = commandClass.getCommandClass();
  		if (!supportedCommandClasses.containsKey(key)) {
  			supportedCommandClasses.put(key, commandClass);
  		}
  	}
docs: Adds a command class to the list of supported command classes by this
  endpoint. Does nothing if command class is already added.
  @param commandClass the command class instance to add.