Using Nordic Connect SDK to develop Matter application without external flash memory

[frazieje]

I've developed a custom Matter application based on the Matter samples in the Nordic Connect SDK, targeting the nrf52840.

I developed the first version using the nrf52840dk, and went on to start the process of converting the application to use my custom board.

The custom board design does not contain an external flash (it was designed for another project)

I noticed in the documentation that external flash is required to support the Matter samples.

This section of the documentation states that external memory is "required to perform the DFU operation"

Would it be possible to modify the application (perhaps by disabling the DFU feature) to allow it to be used without the external flash? What steps would need to be taken?

[SwRa]

Hello,.

Would it be possible to modify the application (perhaps by disabling the DFU feature) to allow it to be used without the external flash?

Unfortunately, this is not possible. For matter, DFU is mandatory. And the nRF52840 cannot support DFU with only internal flash. This is due to the size of the firmware images and the need for a secondary slot to store the new image during the update process.

Regards,

Swathy