DFU Mesh over BLE

[Zhenya Zh]

Hi.

I have problem with dfu over ble with mesh sdk. I use example experimental_lpn as guide. When I add this dfu functionality in my project, my application is not responding. It seems that this issue appears in function nrf_mesh_dfu_cmd_send() in nrf_mesh_dfu_init(). It looks like infinite loop. I dont see any error messages or asserts.

My log output:

<t:          0>, main.c,  300, ----- BLE Mesh Light Switch Server Demo-----
<info> app: Setting vector table to bootloader: 0x000F8000
<info> app: Setting vector table to main app: 0x00026000
<info> app: ble_dfu_buttonless_backend_init after
<info> app: sd_ble_gatts_service_add after
<info> app: sd_ble_uuid_vs_add after
<info> app: ble_dfu_buttonless_char_add after
<t:       9514>, main_mesh.c,  111, BEFORE mesh_stack_init
<t:       9520>, mesh_stack.c,   72, BEFORE nrf_mesh_init
<t:       9990>, nrf_mesh_dfu.c,  644, AFTER dfu_cmd_handler_set
<t:       9997>, nrf_mesh_dfu.c,  656, AFTER rand_prng_seed
<t:      10009>, nrf_mesh_dfu.c,  675, BEFORE nrf_mesh_dfu_cmd_send

My code in nrf_mesh_dfu_init():

    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "BEFORE nrf_mesh_dfu_cmd_send")
    error_code = nrf_mesh_dfu_cmd_send(&init_cmd);
    __LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "AFTER nrf_mesh_dfu_cmd_send");

[Hung Bui]

Hi Zhenya, 

Have you performed a test with the experimental_lpn DFU over BLE ? Did it work ?

Please be ware that the DFU over BLE is not related to the standard Mesh DFU. The reason is that LPN node doesn't support Mesh DFU so we do a normal BLE DFU. 

Don't think you should call nrf_mesh_dfu_cmd_send(). 

You should call ble_dfu_support_service_init() instead. And also please be aware that you need to flash the nRF5 SDK's bootloader, not the mesh bootloader. 

Please follow the documentation here. 

[Zhenya Zh]

Thank you for your answer.

Normal BLE DFU is what I need in my project. I want to update davices one by one.

Yes, I called function ble_dfu_support_service_init(). Function nrf_mesh_dfu_cmd_send() was called by nrf_mesh_dfu_init() in nrf_mesh_init(). My mistake was that I did not add source file nrf_mesh_weak() instead of nrf_mesh_dfu() in ses project. When I did this my issue was solved. But i have some more questions:

1) How can I flash device with application with bootloader? Now I firstly flash secure_bootloader and than via android app nrfConnect flash my application over dfu.

2) Can I debug application in ses, which was flashed over dfu?

[Hung Bui]

Before testing with debugging, could you please test the bootloader and do DFU for testing ? Please follow my guide in the blog to do a DFU test with the nRF5 SDK first (no mesh) . 

Please open RTT and look for the log of the bootloader. Make sure your bootloader works fine and you can do normal DFU update. 

After that, follow what we have in this guide.

[Hung Bui]

P/S: Please make sure you use SDK v15.2 not SDK v15.3. Mesh SDK v3.1 is compatible with SDK v15.2 

[Zhenya Zh]

Yes, I use SDK v15.2 and Mesh SDK v3.1

I cant download bootloader_debug using this script, bootloader is not starting. There are no logs and DfuTarg in adv. Why?

nrfjprog --family NRF52 --program s140_nrf52_6.1.0_softdevice.hex --chiperase --verify
nrfjprog --family NRF52 --program secure_bootloader_ble_s140_pca10056_debug.hex --verify
nrfjprog --family NRF52 --reset

But I can download bootloader_debug using ses and all work well. After this I download my application using nrfConnect on android. And debug in my application earned. 

My new question is why bootloader_debug does not worked when it's flashed using nrfjprog?

[Hung Bui]

Hi, 

Could you tell which nrfjprog version you are using ? 

Could you send your .hex files ? 

I attached here the hex files I used. With nrfjprog I have no trouble programming the softdevice and bootloader , and it worked after reset.

 secure_bootloader_ble_s140_pca10056_debug.hex

s140_nrf52_6.1.0_softdevice.hex

[Zhenya Zh]

All work well with your bootloader_debug. I think it was my mistake in bootloader project. 

Ok, thank you for your answers!