Restore sensor state after reboot

[pterodaktil02]

Hi
I have a problem that controller forgot it's state when i reboot my HA. And it begin search optimal parametrs from the begining.
It seems a good idia restore last state after HA restart.

[soloam]

I don't think this is possible, the sensor loses the data on reboot, I don't think it's possible to restore it on reboot! If it's possible I have to see who to implement it.

[pterodaktil02]

i think most interesting is I
Is there any way to read var I from sensor/file etc?

[soloam]

Only I would not be very useful, it would be necessary to also get last input and last error value

[pterodaktil02]

Last input data is not critical - in stable PID controller use only I .
So after start
Let's check situstion that i have on any reboot:
I control objects with very big time constant (from 5 min to 3 hous ).
So after hours of work controller found optimal I and it have very small P and D.
As i see - lost of P or D is not critical - i will get them in few minutes. we can calculate them after start.
But we will search for the value of I again within hours.
Btw it's my fastest control https://pidtuner.com/#/RGtoWzvHBo

[KrzysztofHajdamowicz]

Idea: implement backing up vital data as JSON to input_text every PID calculation. Add service pid_controller.restore to read backed up state from said input_text . Maybe such feature is enough to make this issue fixed?