rosserial_bridge.launch

<launch>
  <arg name="serial_port" default="/dev/ttyS1"/>
  <arg name="serial_baudrate" default="525000"/>
  <node pkg="rosserial_python" type="serial_node.py" name="serial_node" output="screen">
    <param name="port" value="$(arg serial_port)"/>
    <param name="baud" value="$(arg serial_baudrate)"/>
  </node>
</launch>