Dealing with the unexpected
ROS has several tools for detecting potential problems in all the elements of a given package. Just move with roscd to the package you want to analyze. Then, run roswtf. For chapter3_tutorials, we have the following output. Note that if you have something running, the ROS graph will be analyzed too. We have run the roslaunch chapter3_tutorials example6.launch command, which yields an output similar to the following screenshot:
In general, we should expect no error or warning, but even then some of them are innocuous. In the previous screenshot, we can see that roswtf does not detect any error; it only issues a warning ...
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