matter NVS settings

[wesson]

I'm using ncs2.6.0 to develop a door lock project for matter, and I'm running into a problem: I need to store some user-set parameters in the project, which take up less space but change frequently, so I'm storing them in settings. But matter itself uses this area for storing information, and it erases my parameter information when matter resumes initialization. How can I separate the storage that comes with matter from my own settings storage?

[Charlie]

Hi Wsson,

You can try to separate the storage that comes with Matter from your own settings storage by defining a custom partition in the flash. This can be done by defining the settings_storage partition in the flash. The recommended minimum size of the partition is 32 kB, but you can reserve even more space if your application uses the storage extensively. Matter samples in the nRF Connect SDK reserve exactly 32 kB for the settings_storage partition. 

In addition, you can use the Zephyr NVS storage system on a custom partition. This ensures that your data won't interfere with the Matter/OpenThread stack's persistent data. A new partition can be added to your custom board's DTS file, or can be an overlay if you're using a DK.

Here is an example of how to define a custom partition:

// default storage partition will be used by FCB/LittleFS/NVS if enabled.
storage_partition: partition@f6000 {
  label = "storage";
  reg = <0x000f6000 0x00008000>;
};

Best regards,

Charlie

[wesson]

Hello, can you help me answer the above question?