BLE DFU NCS 1.3.0

[Vojislav]

Hi,

I have a problem with DFU upgrade over BLE on nRF52840dk. For some reason,the upload speed is quite slow ~0.4kB/s. For this test,I used SMP server app and did the compilation with the and:

west build -b nrf52840dk_nrf52840 -- -DOVERLAY_CONFIG=overlay-bt.conf

And to upgrade the firmware I used hello_world app with additional line in prj.conf (CONFIG_BOOTLOADER_MCUBOOT=y) to enable the bootloader. The upload was done over nRF Connect application (4.42.2) on Android phone with file hello_world/build/zephyr/app_update.bin

When I was using NCS 1.2.0 I got speeds up to 1.2kB/s as I remember, what is the problem with this release?

Best regards,
Vojislav

[Vojislav]

And also when I use nRF Connect for Desktop (v3.4.1) on my Ubuntu machine with nRF52 dongle I do not have DFU icon:

Best regards,
Vojislav

[Einar Thorsrud]

Hi Vojislav,

I am sorry for the late reply. I am not sure why the transfer speed has decreased from NCS 1.2.0 to NCS 1.3.0. Let me look into it and get back to you.

[Einar Thorsrud]

Hi,

I have not found an explanation for the difference in speed. Did you use the same Android phone and the same connection parameters in both tests?

Regarding the nRF Connect for Dekstop screenshot that does not show the DFU icon as it does not support NCS DFU yet (unlike nRF Connect for Android and iOS).

[Vojislav]

Hi Einar,

Ok, please let me know as soon as you find out. 

Best regards,
Vojislav

[Vojislav]

Hi, 

Einar Thorsrud said:

I have not found an explanation for the difference in speed. Did you use the same Android phone and the same connection parameters in both tests?

I have used the same phone for both tests and I have not changed any parameters. The demo with NCS1.2.0 I tested a while ago, and demo with NCS1.3.0 I tested before writing this issue. Thing that changed is that now I am using nRF52840 instead of nrf52832 and I updated my nRF Connect application to the latest version. My testing phone is Huawei P20 (Android 10), it that matters. 

Einar Thorsrud said:

Regarding the nRF Connect for Dekstop screenshot that does not show the DFU icon as it does not support NCS DFU yet (unlike nRF Connect for Android and iOS).

 Oh, I did not know that then I can use mcumgr to upload the firmware upgrade over BLE from a computer. 

What is the speed I should expect to get? Do you have any suggestions on what to change to make things better?

Best regards,
Vojislav