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Hello, this problem is very old but I encountered the same thing and I found no answer on the internet. The problem was that I had not specified the screen as the output of the serial node. So I added output="screen" to my launch file as shown below: <launch> <node name="serial_node" pkg="rosserial_python" type="serial_node.py" output="screen" required="true"> </node> </launch>

hopefully it will helps somebody

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