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the ROS_HOSTNAME should not be the IP address. Use ROS_IP. The HOSTNAME would be the output from /etc/hostname of the machine. you would then set that in the /etc/hosts file on your laptop such as 172.20.10.9 <whatever the="" rpi="" hostname="" is="">

the ROS_HOSTNAME should not be the IP address. Use ROS_IP. The HOSTNAME would be the output from /etc/hostname of the machine. you would then set that in the /etc/hosts file on your laptop such as

172.20.10.9 <whatever the="" rpi="" hostname="" is="">"whatever the RPi hostname is"