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The rostopic pub is a command to be used when you want to publish a topic. To read it, use the rostopic echo as you do in /mavros/imu/data.
It is recommended that you check the rostopic list to see if /rc/in is flowing.
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It is like the rc_io plugin to publish /rc/in.
http://wiki.ros.org/mavros#mavros.2FPlugins.rc_io
However, by default, rc_io is not read.
https://github.com/mavlink/mavros/blob/f1e50e17f5fac8c8051f10380a0a54a2de8159a9/mavros/launch/apm_pluginlists.yaml
Maybe it works by adding rc_io to the list of `apm_pluginlits.yaml'.
old
The rostopic pub is a command to be used when you want to publish a topic. To read it, use the rostopic echo as you do in /mavros/imu/data.
It is recommended that you check the rostopic list to see if /rc/in is flowing.
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