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Mark read-only parameters as such

Sander G. van Dijk requested to merge 25-node-fails-when-changing-a-read-only-parameter-through-ros-param into foxy

The read_only constraint should be set in the descriptions of those parameters that can not be changed at runtime:

  • video_device
  • camera_frame_id

This way trying to set them gives the more useful error that the parameter 'cannot be set because it is read-only' instead of a generic failure when trying to be changed.

Closes #25 (closed)

Edited by Sander G. van Dijk

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