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You should post your listener code. there's no instance of a lookupTransform which is what's failing. Since the list of frames is empty. I'm guessing that you have not giving the TransformListener class time to fill its buffer. I suggest you review the tf Tutorials in particular writing a listener where you should always use a try catch statement and git it time to retry.
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You should post your listener code. there's no instance of a lookupTransform which is what's failing. Since the list of frames is empty. I'm guessing that you have not giving the TransformListener class time to fill its buffer. I suggest you review the tf Tutorials in particular writing a listener where you should always use a try catch statement and git it time to retry.
Edit: Sorry I didn't see that the output was from tf_echo.
Your problem is that you're constructing the broadcaster inside your callback. This does not give it enough time to establish connections before destructing. You should make sure your broadcaster persists between callbacks.
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