Parameter of "altitude_max" in ardrone_driver node

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Regarding using tum_simulator to simulate AR.Drone, I am curious about parameters which can be passed in ardrone_driver node in a launch file like altitude_max. Does our client code upon reading the parameter altitude_max need to implement or is it enough to define/pass the parameter in a launch file such that the low level ardrone_driver is already having an implementation to take the parameter as an input and provide an upper-bound of max altitude control somewhere?