How can i launch Nav things in my real turltbot3

[PVijayaGanesh]

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Description

Hi I successfully did the free fleet + Openrmf + Nav on the simulation..
But i need to try the same things on three real turtlebot3 what modificcations to do..?

I bringup the bots with namespace...
How can i launch this ...anyone please help
https://github.com/open-rmf/free_fleet/blob/main/ff_examples_ros1/launch/multi_turtlebot3_ff.launch