It will work if you use the logic explained in this post: How to publish once (only one message) into a topic and get it to work
Sending the command in a loop is a rough hack to fix the problem described in that post, but it’s not the best solution imho. We should probably update the notes.
We’ll look into it, but what seems to be happening here is that the drone is not landing after taking off. Did you see the drone land while the grader ran?