It depends on how you set things up, but one possible approach is that the supervisor, after a few retries, would also shut down, which would trigger the superv

It depends on how you set things up, but one possible approach is that the supervisor, after a few retries, would also shut down, which would trigger the supervisor above that to restart the whole thing with a different port. This wouldn't make sense, probably, but maybe it illustrates how you can go about these things.