DFU over Mesh by using nrf52840 DK and dongle

[Sama]

Hello,

I am going to run DFU over the mesh.

I am using an nrf52840DK and two nrf52840 dongles. I want to send a DFU file through the serial port to the DK and then through the mesh to the dongles.

I follow the instruction mentioned in the Configuring and performing DFU over Mesh section in Nordic Semiconductor Infocenter and facing several issues:

1. In Step 1 (Generate a DFU file with nRF Util), it is recommended to use blinky hex code inside the bin folder. I want to know that what the source of this hex code is? Can I use them for dongle too? 
2. When I used this code to build the DFU file, I faced an error: wrong value for the size. I follow several tickets on the Devzone, but I do not understand what exactly I should do.
3. I took these steps:

a. Generate private keys and device page

b. Generate a DFU file by using the blinky example (nrf52 SDK17.2.0) and private key.

c. I program the mesh_bootloader_serial_gccarmemb_nrf52840_xxAA, device page, soft device and DFU example (nrf52 SDK for mesh) on all devices.

d. Finally, after sending the new application to the DK through the serial port, the LED1 and LED3 start liting, and I see the "Device programme" message. When the transfer finishes, LED1 and LED2 start liting, but nothing happens.

What is the problem?

    4.Further, I want to know how to use the dongle as a target in this network. Shall I do the same things for DK with the dongles?

Could you please advice me to solve this problem?

Regards,

Sama

[Joakim Jakobsen]

Hi.

You should be able to perform a DFU on the dongles with your described setup.

First of all:

To perform DFU transfers over Bluetooth mesh you need to use a customized version of the nRF Util tool.
This tool sends the DFU packets to one device over serial interface. This device then stores these packets, and also forwards them to the other devices withing the radio range.

The nRF Util is available at https://github.com/NordicSemiconductor/pc-nrfutil/tree/mesh_dfu. The tool is open source.

Are you using the custom version of nRF Util designed for Mesh?

[Sama]

Hi,

Yes, I installed the customised nRF util.

I think the problem is with the address the application should be placed in, after receiving. I do not know how I can change that and what it must be, to work correctly.

I look forward to hearing from you.

Regards,

Sama

[Joakim Jakobsen]

Thanks for confirming.

I'll talk to one of my colleagues with more experience with DFU about this and get back to you.

Br,
Joakim

[Joakim Jakobsen]

Hi again.

Do you have any logs for the attemted DFU? Anything that could give a pointer to what the problem might be?

Br,
Joakim

[Sama]

Hi,

 I am sorry for my too late reply. I have worked on the other parts of the project.

I am now working on this part. I founded out my problem was the start address of the application in the flash. I managed to solve this by changing that.

Br,

Sama