Updating the connection transmit data length parameters leads opcode 0x2022 status 0x01 error

[martin_nl]

I've tried to follow the exercises from the Bluetooth Low Energy Fundamentals course. When I try to run the solution for lesson 3 exercise 2 I get the following error messagen when I connect with the board:

[00:01:22.417,602] <wrn> bt_hci_core: opcode 0x2022 status 0x01 
[00:01:22.417,633] <err> Lesson3_Exercise2: data_len_update failed (err -5)

The error message originates from calling the bt_conn_le_data_len_update function.

I'm using the v2.9.0 toolchain and SDK. The board is a nRF5340 Development Kit.

According to sdc_hci_cmd_le.h the opcode means that the data length could not be set and the status means "UNKNOWN HCI COMMAND" (BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 1, Part F, section 2.2). Is this correct?

BR

Martin

[Hieu]

Hi Martin,

You are right in your investigation. 0x2022 is indeed the op code for LE Set Data Length, and 0x01 status code is Unknown Command.

In the lesson, the steps to enable Data Length update are separated into a General section, and a nRF5340 DK section. Did you make sure to follow the nRF5340 DK section?

BR,

Hieu

[martin_nl]

I wasn't using the latest version of the git repository. After I've updated the repository the example solution now works as expected.

[Rick Cai]

Hi，

I encountered the same error with 5340. Could you tell me what git repository can solve this problem? 

[martin_nl]

The version which was working for me was 5752d0c19ae6b0e7844f25fb4b58f914f45c420e of the https://github.com/NordicDeveloperAcademy/bt-fund.git repository.

[Rick Cai]

Thanks bro:)

I have figured out the root cause. The problem is not repository version. 

As we changed TX and RX size in "ipc_radio.conf", we need to flash "merged_CPUNET". 

We should do a pristine build and flash 2 images altogether.