Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Amanda Hsieh — Tue, 13 Aug 2024 12:46:27 GMT

(updated)

Hi,

[quote user="DorisLucky"]I am not sure which controller I am using, but the sample code comes from v2.7.0\zephyr\samples\bluetooth\hci_uart[/quote]

The default setting is the Softdevice controller. Could you test with the Zephyr Controller? Set the CONFIG_BT_LL_SW_SPLIT=y in your configuration. This can be done in the prj.conf file of your application.

From the team:

This failure is different from the baud rate issue I have seen. Here with SDC, it thinks the Controller is a BR/EDR+LE Controller and hence requests HCI Read Local Name command!…

Please provide a full btmon trace, i.e. btmon started before btattach . I need the HCI commands like, HCI Read Supported commands, Features, etc.

-Amanda H.

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Doris.chen — Tue, 13 Aug 2024 05:00:23 GMT

Hi Amanda,

I am not sure which controller I am using, but the sample code comes from v2.7.0\zephyr\samples\bluetooth\hci_uart. The baud rate I am using is 1 Mbps.

However, I believe the issue is not related to the baud rate. Based on the command and log messages in Linux, it seems that the command information is not recognized.

To clarify:

The issue does not occur in BlueZ 5.55.
The "advertise on" command is listed in the command list.

We are currently investigating the root cause, but if you have any experience or insights that could help, it would be greatly appreciated.

Best Regards,

Doris

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Amanda Hsieh — Thu, 08 Aug 2024 14:57:59 GMT

(updated)

Hi,

Are you using Zephyr Controller or SDC in NCS v2.7.0?

What baud rate the hci_uart is built for?

I am noticing UART stall on large HCI events generated when using 1Mbps UART. Using 115200 bps, do not see such behavior.

-Amanda H.

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Doris.chen — Thu, 08 Aug 2024 07:33:19 GMT

Hi Amanda,

Thank you for the update and support. However, the progress of this project is quite urgent, and we really need to receive relevant information as soon as possible. We would greatly appreciate it if you could expedite the processing.

Thank you for your understanding and assistance!

Best regards,

Doris

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Amanda Hsieh — Mon, 05 Aug 2024 18:31:40 GMT

Hi,

Thanks for helping clarify the issue. I have reported to the team.

We are currently understaffed due to the summer vacation period, so delayed replies must be expected. I am sorry about any inconvenience this might cause.

-Amanda H.

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Doris.chen — Fri, 02 Aug 2024 01:59:16 GMT

Yes, the problem still persists.

Here are the test results from yesterday using BlueZ with NCS 2.7.0 version HCI_UART

1.BlueZ 5.55 - Test passed

2.BlueZ versions above 5.55 (in this case, 5.56) - Test failed

Do you have a good solution for this issue?

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Amanda Hsieh — Wed, 31 Jul 2024 19:47:59 GMT

Could you test with v2.7.0 HCI_UART? Do you see the same issue with BlueZ above V5.55?

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Doris.chen — Wed, 31 Jul 2024 02:09:47 GMT

Hi Amanda,

Is it possible that your HCI_UART code is subject to modifications at any time? From my previous understanding, the HCI_UART code should be fixed. However, I am not very familiar with the HCI_UART firmware, so I am not entirely sure.

Additionally, I came across this article on the forum. Could it be related to this issue?
NRF5340 HCI_USB & HCI_UART Stop Scanning

I need a definite answer because this is for a verified product. Currently, with the same firmware, using BlueZ V5.55 works fine, but versions above V5.55 encounter this issue. This affects the program's workflow.

RE: Bluetooth Advertising Interruption Issue with BlueZ Versions Above 5.55 on nRF52833

Amanda Hsieh — Tue, 30 Jul 2024 15:07:32 GMT

Hi,

It is worth trying to update your NCS version if there are any specific compatibility issues between the BlueZ version and the NCS version you are using. The latest NCS is v2.7.0.

Regards,
Amanda H.