Troubleshooting
General
- Check that you don't have messages such
exception was not handled.
- Add prints everywhere to find where the program hangs.
Executable not found
- Make sure to build and to source the environment with
tdde05-start
- Make sure your
setup.py is well formed (in particular, there should be a , if you have two or more executable).
Topic, Service, Action not working
- Check the types and names are correct (they should match what you get from
ros2 topic, ros2 service and ros2 action commands).
- Check the node is spinning, i.e., that it was added to an executor, that the executor is spinning.
- If making a service/action call from a callback, make sure you are using a
MultiThreadedExecutor and that ReentrantGroup are set correctly.
- Make sure that you are not that not using
rclpy.spin* functions with a custom created executor.
Strange errors
- When calling
self.executor.add_node you get the error Cannot call 'add_node' on object of type NoneType. Try renaming self.executor to self.executor_. This might be caused by some conflicts with a base class.