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This was created six months ago, but the PSUControl plugin was lacking events and helper functions. I have then added these to the plugin and created a PR, but it took a while for that was merged so I kind of forgot I still had to push this code.
This weekend I rebased my fork to your current code and re-added the PSUControl functionality.
In short: this will check if the PSUControl helpers are available and if so, it will publish a switch to HA for toggling the power supply.