How to store larger data using flash manager in nrf5 mesh sdk

[Vignesh R]

Hi, I have implemented the following and succeeded storing and retrieving values from flash

Mesh 4.0 SDK Flash Manager - Storing values - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

In this application the mesh uses (0x000F8000 - 0X000FE000) for its mesh_initialization 

and the page i used here is 0x000FF000(flash_manager_recovery_page_get()) to store my data

and then i also tried the pages before F8 , that were also successful.

Now my question is,whether the below default config values can be changed or not??

/** Maximum number of pages that can be owned by a single flash manager */
#ifndef FLASH_MANAGER_PAGE_COUNT_MAX
#define FLASH_MANAGER_PAGE_COUNT_MAX 255
#endif

/** Size of the flash manager data pool, storing pending writes. */
#ifndef FLASH_MANAGER_POOL_SIZE
#define FLASH_MANAGER_POOL_SIZE 256
#endif

/** Maximum size of a single flash entry in bytes. */
#ifndef FLASH_MANAGER_ENTRY_MAX_SIZE
#define FLASH_MANAGER_ENTRY_MAX_SIZE 128
#endif

for eg. i have tried changing the max entry size to 256 and it seems to be kind of working, and i just wanted to confirm it.

Thanks

[Hieu]

Hi Vignesh R,

I would like to let you know that I have been assigned to help you with this. However, I need to double check with more engineers on this topic before answering you.

I will follow up with you latest by the end of Thu Dec 15.

Meanwhile, could you please describe your use case which necessitate the adjustments of those configurations?

Hieu

[Hieu]

P.s: By the way, are you starting a new project which require this? As you might know, the nRF5 SDK for Mesh is in maintenance and hasn't been in active development for two years.

[Vignesh R]

In flash_manager_entry_alloc() function the data_length argument must not exceed the FLASH_MANAGER_ENTRY_MAX_SIZE (said in infocenter document), (i.e) i could able to write only 128 bytes at a time, is it possible to increase the entry per size or i have to implement some loop logic to store more than 128 bytes??

[Vignesh R]

Since our project requires DFU support in mesh, which isn't available in nrf connect sdk, we have been using nrf5 mesh sdk and almost first stage development is over

[Hieu]

How much would you need to increase the entry size?

Some concerns regarding increasing the size would be effects on the flash wear, and the increased time of flash operation blocking other CPU processing.

On the other hand, if your motivation for choosing the nRF5 SDK for Mesh is solely for the DFU feature, you might want to know that starting with NCS v2.2.0, NCS now also support DFU over Bluetooth Mesh, with sample implementation in the Mesh Light sample.

If you have not proceeded too far along with your project, we do recommend you consider using NCS instead.

[Vignesh R]

Thank you Hieu for updating me on the DFU Mesh feature on ncs, in that case after a discussion about this, we are considering to shift towards connect SDK.

Once again thanks! Cheers.