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Just to confirm a couple of things:

You're running Ubuntu 16.04 with ROS Kinetic on your RPi4 (IP 192.168.1.101)
You're running Ubuntu 20.04 with ROS Noetic on your laptop (IP 192.168.1.102)

Also what exactly have you added to your bashrc to try and set this up. An exact copy of the lines for both of them.

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