RE: .dat file content from the ZIP packet information

Edvin — Mon, 07 Feb 2022 22:14:14 GMT

Hello R_S,

We don't have any good documentation on what the different bytes in the .dat file means, but you can try to generate a packet, and populate the fields differently, and by watching the outcome in the .dat file, you will recognize a few of them. you can also use "nrfutil pkg display pkg.zip.

You can also look at the implementation of nrfutil on github, as this is probably the closest thing to the documentation that we have.

The last way to go about this would be to look at the implementation of the bootloader (SDK\examples\dfu\secure_bootloader\)

In SDK 17.1.0, there is a function called nrf_dfu_validation_init_cmd_execute() in nrf_dfu_validation.c.

Is there a particular field you are curious about, or do you plan to edit something? If so, perhaps you are interrested in the "Customizing the init packet" section in the nrfutil documentation on infocenter.

Best regards,

Edvin