How to save application data to flash in Matter accessory

Question

Hi support team, 
 I want save my application settings to flash, how to do that ? 
 For example, in NCS v2.3.0 matter light-bulb sample that I want to save the latest led's status. 
 Is there any software module in NCS can support the requirement ? 
 
 best regards 
 Eric

Axel Schlueter · Accepted Answer

I just did the same, and I decided to go with the regular Zephyr NVS storage system on a custom partition. The custom partition is so that I 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: // default storage partition will be used by FCB/LittleFS/NVS if enabled. storage_partition: partition@f6000 { label = "storage"; reg = <0x000f6000 0x00008000>; }; // custom partition to not interfere with the Matter storage lamp_storage_partition: partition@fe000 { label = "lamp_storage"; reg = <0x000fe000 0x00002000>; }; Once you have the partition it can be used like the regular partition in the NVS examples: struct nvs_fs fs; [...] fs.flash_device = FIXED_PARTITION_DEVICE(lamp_storage_partition); fs.offset = FIXED_PARTITION_OFFSET(lamp_storage_partition); if (!device_is_ready(fs.flash_device)) { LOG_ERR("...", fs.flash_device->name); return false; } Hope that helps!

How to save application data to flash in Matter accessory

Top Replies