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Hi, please can you help me,i have project arm robot with ROS in Raspberry, i know how run two arduino same time but i need publish different valor of just each topic , the commade is :

rostopic pub servo4 std_msgs/UInt16 180

<node pkg="rostopic" type="rostopic" name="rostopic" args="pub {pub args}" <="" p="">

How can I use that ? For example, the arm needs the initial position of this arm to be 6 degrees  of liberty. We need to publish six different topics. i thinking this parameters but i don't know if this is true :

pkg = rostopic

type = pub servo4

name = std_msgs/UInt

args = entre 0  to 180