mycobot_ros/Mercury/mercury_a1_communication/launch/communication_service.launch

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<launch>
<!-- Select connecting device and serial port ,选择连接设备及串口-->
<arg name="port" default="/dev/ttyAMA1" />
<arg name="baud" default="115200" />
<!-- Open communication service ,开启通讯服务-->
<node name="mercury_services" pkg="mercury_a1_communication" type="mercury_services.py" output="screen">
<param name="port" type="string" value="$(arg port)" />
<param name="baud" type="int" value="$(arg baud)" />
</node>
</launch>