DFU over CDC ACM very slow

[Thibaud]

Hello

I am doing a bluetooth dongle and I added MCUBOOT with CDC ACM to be able to update my app. 

I find that the update takes a lot : 5+ min to update a 200kB application.

This is questionning me because I have an other bluetooth product with a nRF52840 too and I can do an update within 30s max by ble.

It would seem logic that USB dfu is faster than BLE.

Regards

Thibaud

[Priyanka]

Hi,

I understand your concerns. Could you maybe try, as mentioned in this ticket by a colleague of mine, to try with nrfutil?

Regards,

Priyanka

[Thibaud]

Hi 

I will try it but if nrfutil is better than mcumgr why is it not mentionned anywhere in the docs.nordicsemi.com website ?

In the link you sent me there is a link to an other ticket where the solution was to change a function in the "serial_xport.go  found in go\pkg\mod\mynewt.apache.org\[email protected]\nmxact\nmserial\" do you have any idea wher I can find this file ?

Regards

Thibaud

[Priyanka]

Here is the nRFUtil documentation:https://docs.nordicsemi.com/bundle/nrfutil/page/README.html 

Also, The file path mentioned ("go\pkg\mod\mynewt.apache.org\[email protected]\nmxact\nmserial") shows that it's likely a part of a Go module, related to mcumgr. So you might need to modify a Go source file - and this is part of the mcumgr tool's codebase. So I guess Zephyr support could be the experts here.

-Priyanka

[Thibaud]

Hi

I am trying to use nrfutil but when I do device list I don't have mcuboot in the traits of my product. Even if it is in MCUBOOT.

1st time my product is in app :& 2nd time it is in bootloader (MCUBOOT of course) : 

This is what happen when I try to flash : 

Regards

Thibaud

[Thibaud]

Hi,

I also tried to use USB DFU sample but here what the dfu-util command linedoes : 

 

Is there any reliable way to update an application through USB ?

Regards

Thibaud