How can i publish data with new a topic from receving imu sensor in arduino??

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Hello, now i am studiying with arduino minimu9 v5 on arduino mega.I can see the data I get from arduino with serialnode.py on ros. I am currently working on visualization of the data. I learned that I need to publish the data I receive from arduino over a new topic. The type of messenger I use is std_msgs/Float32MultiArray.How can I create the code that I will publish? Need urgent help???