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Nevermind, I solve the issue following a solution in the comments of this website: https://answers.ros.org/question/294056/connecting-ros-to-arduino-serial-port/

I followed one of the comments which says " cd catkin_ws/src/rosserial/rosserial_python/src/rosserial_python/SerialClient.py file and on line 356 and 358, I changed it from write_timeout to writeTimeout. That did the trick."

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