Is there any way to detect when an entry sensor is triggered while the system is off?

[Suchit-07]

There's no event given if an entry sensor is opened while the system is off, is there any other way to do it?

[bachya]

You can manually poll the sensor in question and see if its triggered value has changed.

https://simplisafe-python.readthedocs.io/en/latest/sensor.html#sensors