How can I store more than 64 byte data to Flash, with MESH-config ?

[galilei]

The enocean_switch example has MESH-config example, to store data in FLASH, within the mesh rules.

I use it in my app, IT WORKS, but the biggest data array what I can store in Flash with MESH-config is 64 byte !

From bigger array size, for example 65, I get an error message:  "error: static assertion failed: "unspecified message""

I work with  SES 5.42,   nRF5_SDK_17.0.2, and  s132, SD v7.2.0.

[galilei]

after some hours I found this in: ..\mesh\core\api\mesh_config_entry.h

#define MESH_CONFIG_ENTRY_MAX_SIZE 64

Can I change it, in my project?

[Mttrinh]

Hi,

MESH_CONFIG_ENTRY_MAX_SIZE is limited by FLASH_MANAGER_ENTRY_MAX_SIZE (128 bytes): https://github.com/NordicSemiconductor/nRF5-SDK-for-Mesh/blob/master/mesh/core/api/nrf_mesh_config_core.h#L461.

You can try to increase it, but there is one limitation that doesn't allow to set it bigger than `sizeof(fm_header_t) + sizeof(emergency_cache_item_t) + MESH_CONFIG_ENTRY_MAX_SIZE`:

https://github.com/NordicSemiconductor/nRF5-SDK-for-Mesh/blob/master/mesh/core/src/emergency_cache.c#L50.

If you decide to increase FLASH_MANAGER_ENTRY_MAX_SIZE, you will also need to increase FLASH_MANAGER_POOL_SIZE (https://github.com/NordicSemiconductor/nRF5-SDK-for-Mesh/blob/master/mesh/core/api/nrf_mesh_config_core.h#L46), which should be at least twice as big as FLASH_MANAGER_ENTRY_MAX_SIZE.

FLASH_MANAGER_ENTRY_MAX_SIZE and FLASH_MANAGER_POOL_SIZE can be change from nrf_mesh_config_app.h

[galilei]

Thank you for your usefull answer! I will check it.

Is there any other solution to store 4096 byte data to the FLASH in MESH5,  with or without mesh config?

(_SDK_17.0.2, and  s132, SD v7.2.0.)

[galilei]

It seems works! 

I tryed with success with these settings, but I will try larger sizes too

FLASH_MANAGER_POOL_SIZE 512

FLASH_MANAGER_ENTRY_MAX_SIZE 256

MESH_CONFIG_ENTRY_MAX_SIZE 248 

In this case the maximum entries DATA  size is 248 byte