ATTRIBUTE_FLAG_NONVOLATILE not really working. (CON-1219)

[ronny-antoon]

Describe the bug
Iam trying to make the Window Device [Endpoint] store the current percentage in NVS,
My goal: After rebooting the device the current percentage should be as last known value if exist or 0.

by default the esp_matter window endpoint is adding this flag esp_matter::attribute_flags::ATTRIBUTE_FLAG_NONVOLATILE. so it should work as it is. Look at this Attribute creation.

when rebooting the esp32 this attributes goes 0 and not last known value from NVS.

What is the walk around to achieve this goal.?

Environment

• ESP-Matter Commit Id: esp-idf registry 0.0.2
• ESP-IDF Commit Id: v5.1.2
• SoC (eg: ESP32 or ESP32-C3): ESP32
• Apple Homepod mini version 17.5 , Apple iphone 13 version 17.5

[jadhavrohit924]

@ronny-antoon CurrentPositionLiftPercentage is getting restored after reboot. I have tested with chip-tool. You might be looking for wrong attribute here? In Apple home TargetPositionLiftPercent100ths is reflecting in the UI and this attribute is volatile that why device is reseting the value to 0

[ronny-antoon]

@ronny-antoon CurrentPositionLiftPercentage is getting restored after reboot. I have tested with chip-tool. You might be looking for wrong attribute here? In Apple home TargetPositionLiftPercent100ths is reflecting in the UI and this attribute is volatile that why device is reseting the value to 0

So you think if i change the 'TargetPositionLiftPercent100ths' to non volatile it should work in apple homekit?

[jadhavrohit924]

Yes, but TargetPositionLiftPercent100ths is volatile defined by matter spec. So you should not change the quality of attribute.

[ronny-antoon]

Yes, but TargetPositionLiftPercent100ths is volatile defined by matter spec. So you should not change the quality of attribute.

Okay, so what i can do to work around my problem.
Issue this in apple.!?

Or i can add after all the initialization

Change the attribute value of TargetPositionLiftPercent100ths to the attribute value of CurrentPositionLiftPercentage

?

[jadhavrohit924]

Change the attribute value of TargetPositionLiftPercent100ths to the attribute value of CurrentPositionLiftPercentage?

You can definitely do that.

[ronny-antoon]

Change the attribute value of TargetPositionLiftPercent100ths to the attribute value of CurrentPositionLiftPercentage?

You can definitely do that.

Thanks