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Youbot that has joined the created hotspot (These are the only two things in that network). IP 10.42.0.20

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The youbot sources the .bashrc on ssh login and it also contains
export  ROS_IP=10.42.0.1

If this is not a typo, then that is your problem. You state that the youbot is at 10.42.0.20, but you set its ROS_IP to 10.42.0.1. That cannot work.

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