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Another way:

cd /opt/ros/noetic/lib/rosserial_python

sudo cp serial_node.py [new_node_name].py

sudo nano [new_node_name].py

scroll to line containing: rospy.init_node("serial_node") and replace "serial_node" with "[new_node_name]"

sudo chmod +x [new_node_name].py

rosrun rosserial_python [new_node_name].py /dev/ttyUSB0

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