auspic7
commented
3 years ago 
It is possible to happen a off -> off state transition because some switch have additional attribute other than power like current.
I am going to make some fix to resolve this problem.
It seems like to work properly but has a problem... When the sensor value reaches target humidity, it turns off the smart plug successfully, and it will turn off by itself in few seconds.
I know there's already a logic handles internal state change. But I still don't know why this won't work. https://github.com/adrianByv/home-assistant-custom-components-switch-humidifier/blob/b4d7b5c7eda1b4aaf1773c8fb4b780f2807b55d8/custom_components/switch_humidifier/humidifier.py#L216-L226