It possible save the switch state without use the preferences flash_write_interval?
I don’t want use massive writing for that.
I try a workaround to set variable time by number for “flash_write_interval” via lambda but it’s not possible.
Why don’t you want to write to flash? If it’s because fear of wearing it out, I think it’s a vastly overstated problem.
Here’s a quite from @OttoWinter himself:
So as a fundamental thing: Has anyone ever had the memory wear out? I hear a lot of people (IMO incorrectly) fearing about it, but never heard from a user actually experiencing this.
There’s also this answer on Stack Overflow,:
Anecdotal: I’ve had an ESP32 running for several years, saving to flash every hour, without any problems so far.
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You adjust it there how you want, once a minute, ore once a day.
I think I’m on @ster1um side for this.
Even if the device won’t have problems with this, it is about optimizing the code for a good purpose…
If someone knows how to achieve this without flash_write_interval, it would be great…
I think that the best way for the device, is to write to flash only when the button is pressed, or the sensor is chaning state…
In my case, I need the restore last state to be instantly, and only two ways could do that… flash_write_interval or another solution for the writing to happen when the state or button change
You can do right after you invented free energy 
Well, that is what will happen when you activate flash writes 
Only changed states are written to flash and the flash_write_interval will on top limit to writes accordingly. So if your little one turns the light on-off-on-off-on-off… and you set the limit to 1 minute it will only save the first state change and than after one minute again. 