nRF Connect SDK v2.5.2 Release Notes

nRF Connect SDK delivers reference software and supporting libraries for developing low-power wireless applications with Nordic Semiconductor products in the nRF52, nRF53, nRF70, and nRF91 Series. The SDK includes open source projects (TF-M, MCUboot, OpenThread, Matter, and the Zephyr RTOS), which are continuously integrated and redistributed with the SDK.

Release notes might refer to “experimental” support for features, which indicates that the feature is incomplete in functionality or verification, and can be expected to change in future releases. To learn more, see Software maturity levels.

Highlights

This patch release adds changes on top of the nRF Connect SDK v2.5.0 and nRF Connect SDK v2.5.1. The changes affect Matter, Wi-Fi®, and SoftDevice Controller.

See Changelog for the complete list of changes.

Release tag

The release tag for the nRF Connect SDK manifest repository (https://github.com/nrfconnect/sdk-nrf) is v2.5.2. Check the west.yml file for the corresponding tags in the project repositories.

To use this release, check out the tag in the manifest repository and run west update. See Get the nRF Connect SDK code and Updating the repositories for more information.

For information on the included repositories and revisions, see Repositories and revisions for v2.5.2.

IDE and tool support

nRF Connect for Visual Studio Code extension is the recommended IDE for nRF Connect SDK v2.5.2. See the Installation section for more information about supported operating systems and toolchain.

Supported modem firmware

See Modem firmware compatibility matrix for an overview of which modem firmware versions have been tested with this version of the nRF Connect SDK.

Use the latest version of the nRF Programmer app of nRF Connect for Desktop to update the modem firmware. See Updating the modem firmware for instructions.

Modem-related libraries and versions

Modem-related libraries and versions

Library name	Version information
Modem library	Changelog
LwM2M carrier library	Changelog

Known issues

Known issues are only tracked for the latest official release. See known issues for nRF Connect SDK v2.5.2 for the list of issues valid for the latest release.

Changelog

The following sections provide detailed lists of changes by component.

Protocols

This section provides detailed lists of changes by protocol.

Bluetooth

• Fixed an issue that affects SoftDevice Controller when running in continuous scan mode. The controller may end up in an irresponsive state due to this issue. See the changelog of the SoftDevice Controller library for additional information.

Matter

• Fixed:

  • An issue where the Matter device’s application crashes if the DNS resolve response is processed with the TXT record’s data size equal to 0 (KRKNWK-18256).

  • An issue with the IPv6 address update in the DNS server for Matter over Wi-Fi (KRKNWK-18256).

  • An issue with a memory leak in the deferred attribute persister (KRKNWK-18221).

Wi-Fi

• Added support for band selection in shell and API.

• Fixed:

  • An issue with QSPI initialization on a custom board with nRF5340 and nRF7002 (SHEL-2372).

  • An issue where the channel setting is ignored in the connection request.

Zephyr

The Zephyr fork in nRF Connect SDK (sdk-zephyr) contains all commits from the upstream Zephyr repository up to and including a768a05e6205e415564226543cee67559d15b736.

For a complete list of nRF Connect SDK specific commits and cherry-picked commits since v2.5.0, run the following command:

git log --oneline manifest-rev ^v3.4.99-ncs1