RE: Matter Fabric Removal not working

AHaug — Tue, 26 Aug 2025 08:18:01 GMT

Hello,

Apologies for the long response time.

So if I understand you correct, you want to have the device removed from the fabric, but you don't want to factory reset the Matter devices you want to remove? For one of your two devices you suceed with this.

From https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/matter/getting_started/advanced_kconfigs.html#reaction_to_the_last_matter_fabric_removal and https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/protocols/matter/end_product/last_fabric_removal_delegate.html:

You can further control the device's behavior after the last fabric is removed by configuring the appropriate Kconfig options:

Set CONFIG_CHIP_LAST_FABRIC_REMOVED_ERASE_ONLY to y to remove all saved network credentials while keeping application-specific non-volatile data. The device will not reboot or perform a factory reset.
Set CONFIG_CHIP_LAST_FABRIC_REMOVED_ERASE_AND_PAIRING_START to y to remove network credentials, keep application data, and start Bluetooth LE advertising for new commissioning.
By default, CONFIG_CHIP_LAST_FABRIC_REMOVED_ERASE_AND_REBOOT is selected, which removes credentials and reboots the device, but does not necessarily factory reset unless CONFIG_CHIP_FACTORY_RESET_ERASE_SETTINGS is also set to y.

To avoid a factory reset, ensure that CONFIG_CHIP_FACTORY_RESET_ERASE_SETTINGS is set to n. This way, only the network credentials are removed, and application-specific data is preserved when the last fabric is removed. The device will not be restored to factory settings unless this option is enabled.

Let me know if these links allows you to configure your device as you describe.

Kind regards,
Andreas

RE: Matter Fabric Removal not working

SubuMuthu — Mon, 25 Aug 2025 02:24:11 GMT

Probing this further, when the above happens, the door lock (Thread) end device is still connected to Thread network although Apple home has removed the door lock. Using dns-sd, I can discover the device in the IP network for the node ID 0x00000000149A3293 and I can ping the end device. Thanks.