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Explicitly tell the raspberry pi where the master is located at,

In Raspberry pi add the following line to ~/.bashrc,

export ROS_MASTER_URI=http://192.168.15.10:11311

and in the master ensure you do,

export ROS_IP=192.168.15.10

(I usually set IP as the hostname, i.e., export ROS_HOSTNAME=192.168.15.10.)

Finally, make sure you both the master desktop and raspberry pi are on the same network and you are able to ping master from the raspberry pi.