Connect SDK: hci_usb sample not working with Nordic's LL

RE: Connect SDK: hci_usb sample not working with Nordic's LL

mkarhumaa — Thu, 16 Apr 2020 04:47:01 GMT

Thank you Joakim for analysing the issue!

I'm using Linux. Main problem here is that because initialisation fails, Linux does not recognise nRF52840 DK as Bluetooth device. Apparently Linux does Read Local Commands after LE setup which includes LE Read Buffer Size, LE Read Local Supported Features and LE Read Supported States. All of those are mandatory on LE controller so I guess that is why Linux expects them to be available and is not checking if they are supported.

I will keep eye on nrfxlib updates.

RE: Connect SDK: hci_usb sample not working with Nordic's LL

Joakim Andersson — Wed, 15 Apr 2020 12:29:48 GMT

Thank you for reporting this problem.

A couple of things are wrong here.

1. The host (I'm not sure which one you are using Linux/Windows?) is sending a command to the controller that the controller does not support.
The host should have read the local supported commands from the controller first.
2. The unknown command response from the controller has the wrong length value, causing btmon to report invalid length field.

We will fix the length field, and also add support for the command, Read Supported States.
Look for an update to nrfxlib.

In the meantime could you see if you can stop the host from sending the command?

RE: Connect SDK: hci_usb sample not working with Nordic's LL

Simon — Tue, 07 Apr 2020 08:46:31 GMT

I am sorry for the delay, The staffing is reduced during easter due to holidays and I will be gone this week, but I will be back Tuesday next week and will look at your ticket then.

Best regards,

Simon

RE: Connect SDK: hci_usb sample not working with Nordic's LL

mkarhumaa — Wed, 01 Apr 2020 07:18:26 GMT

Thank you for looking into it.

Now that you pointed out, I tried also hci_uart. It seems to have similar problem than hci_usb when CONFIG_BT_LL_NRFXLIB=y. Am I missing something in project configuration?

When using Zephyr open source controller, everything works fine.

RE: Connect SDK: hci_usb sample not working with Nordic's LL

Simon — Sat, 28 Mar 2020 17:26:54 GMT

I am sorry for the long delay. I was struggling with getting it to work with Ubuntu Virtualbox (recognizing the USB), but with Ubuntu Dual Boot it worked fine. However, the sample itself (hci_usb + Nordic LInk layer) was not working properly. I talked to some of the developers and was told that the hci_usb was not tested at all at the moment. However, the hci_uart sample has been tested more.

The nRF Connect SDK does not support nRF52 and we don't actually give support for it at the moment (in the future we will), only the nRF5340 and the nRF9160. This means that the various nRF52 SoC's are not sufficiently tested with NCS/Zephyr and we can not guarantee that everything works.

I should have informed you about this at an earlier point, my apologies for that.

For questions regarding the nRF52 and Zephyr, please check out the Zephyr mailing list or join the #zephyrproject IRC channel.

Best regards,

Simon

RE: Connect SDK: hci_usb sample not working with Nordic's LL

Simon — Wed, 18 Mar 2020 12:27:09 GMT

I am currently setting up Ubuntu on a VM (I've just reformatted the PC and need to redo this) to reproduce your behavior and will report to you when/if I've been able to reproduce it and hopefully figured out how to bypass the problem.

Best regards,

Simon