Silicon Labs Matter Version 2.6.0-1.4 (June 18, 2025) - Release Notes#

Simplicity SDK Version 2025.6.0

This is the Silicon Labs Matter v2.6.0-1.4 release, which provides the functionality to build Matter applications in the Simplicity Studio environment. This release is intended for developers who wish to run a Matter Demo over Thread (15.4) or Wi-Fi, as well as manually build examples through Simplicity Studio, SLC-CLI or Visual Studio Code.

This release is certifiable to the Connectivity Standards Alliance (CSA) Matter 1.4 certification program (https://csa-iot.org/) for Thread (MG24 / MG26) andWi-Fi NCP platform (MG24/WF200).

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

  • Miscellaneous bug fixes and improvements.

  • Quality-tested Matter 1.4.1 solution for Thread MG24 / MG26, Wi-Fi SiWx917 SoC and NCP mode, Wi-Fi MG24/WF200 and Wi-Fi MG24/RS9116 (non-sleepy).

    • For Wi-Fi SiWx917 SoC and NCP mode, there are known timeout issues in certain stress test conditions, which have not been observed with ecosystems under normal conditions. For details see the Known Issues section of the Release Notes.

  • Works with Simplicity SDK v2025.6.0 and WiSeConnect SDK v3.5.0.

  • Added the ability to run a concurrent BLE connection with Matter OT+BLE DMP or Matter ZB+OT+BLE CMP.

  • Added Multi-OTA alpha support for SiWx917 SoC and NCP.

  • Enable an experimental option to use the TCP/IP NetX stack instead of lwIP for SiWx917 for both SoC and NCP.

API Changes#

None.

Bug Fixes#

Fixes to Matter/WiFi connectivity issues in stress test scenarios.

Chip Enablement#

This release supports series 2 and series 3 EFR32 devices. Use v2.2.x-1.2 for series 1 devices.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

  • Multi-image OTA enhancements feature for SiWx917 (Alpha)

    • Added Multi-image OTA software update capability for SiWx917.

    • Implemented application image handling for efficient OTA updates.

    • Enabled combined image handling for seamless integration of multiple images.

    • Enabled encryption and decryption support for enhanced security.

    • Added Provision storage support to store the OTA keys.

    • Enabled Factory Data OTA upgrade feature for SiWN917.

  • Ability to run a concurrent BLE connection with Matter OT+BLE DMP or Matter ZB+OT+BLE CMP.

  • Experimental option to use the TCP/IP NetX stack instead of lwip for SiWx917 for both SoC and NCP.

Enhancements#

None.

Removed Features#

None.

Deprecated Features#

None.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None.

Modified APIs#

None.

Removed APIs#

None.

Deprecated APIs#

None.

Bug Fixes#

ID

Issue Description

GitHub / Salesforce Reference (if any)

Affected Software Variants, Hardware, Modes, Host Interfaces

1381037

The StartUpOnOff attribute of the OnOff cluster in the Zigbee Matter Light application does not maintain its setting after a reboot.

None

EFR32

1367521

Improved start-up ON time to under 500 ms with Zigbee/Matter CMP Lighting app.

None

EFR32

1404385

Removed duplicated OTA provider after the device detaches and reattaches.

None

EFR32

1436791

StartUpOnOff toggle (2) has the wrong behavior in Zigbee Matter Light sample app.

None

EFR32

1445627

Corrected the PlugOverThread app sequence of actions.

None

EFR32

1434945

Fixed a crash that may occur if the user name is empty when creating a new user with Lock sample app.

None

EFR32

1400085

Fixed an issue with UserIndex missing in Lock sample app when sending a LockOperation.

None

EFR32

1432056

Device hangs during stress test.

None

SiWG917

1432647

Device hangs after being idle overnight.

None

SiWG917

1443714

Observed AP disconnection when the DUT is in an idle state after commissioning.

None

SiWG917

1417941

Missing component file for SGP40 Sparkfun Air Quality Sensor Support with Ait Quality Sensor sample app.

None

SiWG917

1430203

Corrected documentation and commands in the Matter over WiFi SoC Window Covering app.

None

SiWG917

1439077

Corrected documentation in the Matter over WiFi SoC Lock app readme.

None

SiWG917

1417728

Replace the CHIP_ERROR_INTERNAL return code with the appropriate error code.

None

SiWG917

Chip Enablement#

Matter over Thread is supported on the following boards#

  • MG24 boards:

  • MGM24 boards:

    • BRD4316A / SLWSTK6006A / Wireless Start Kit / 2.4GHz@10dBm - xGM240-RB4316A

    • BRD4317A / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm - xGM240-RB4317A

    • BRD4318A / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm - xGM240-RB4318A

    • BRD4319A (Rev A00 only) / SLWSTK6006A / Wireless Starter Kit/ 2.4GHz@20dBm

    • BRD2704A / Sparkfun Thing Plus MGM240P

    • BRD4337A / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@20dBm - xGM240-RB4337A

  • MG26 boards

    • BRD4116A

    • BRD4117A

    • BRD4118A

    • BRD2608A

    • BRD2709A

  • MGM26 boards

    • BRD4350A

    • BRD4351A

Matter over Wi-Fi is supported on the following boards#

  • SoC mode:

    • BRD4338A / SiWG917 Wi-Fi 6 and Bluetooth LE 8 MB Flash SoC Pro Kit - SiWx917-PK6031A

    • BRD2605A / SiWG917 Wi-Fi 6 and Bluetooth LE Dev Kit - SiWx917-DK2605A

    • BRD4342A / SiWG917 Wi-Fi 6 and Bluetooth LE 8 MB Flash + 8 MB ext PSRAM Radio Board with an internal RF switch - SiWx91x-RB4342A

    • BRD4343A / SiWG917Y Module Wi-Fi 6 and Bluetooth LE 8MB Flash RF-Pin Radio Board - SiW917Y-RB4343A

    • Early access for new module board BRD2708A / SiW917Y-EK2708A

  • NCP mode:

Note: Firmware for RS9116, SiWN917 NCP & SiWG917 SoC can be found in the Matter Software Artifacts page in the documentation or Assets section of this page. Connectivity firmware update is mandatory for new release binaries.

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

For the list of supported application examples see Existing Examples. For the details on Matter ecosystems support see Ecosystems.

New Examples#

None.

Modified Examples#

None.

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#

Matter over Wi-Fi with SiWG917 sleepy is Beta quality in this release. It is tested by SQA but is affected by a known issue seen with WiseConnect SDK v3.5.0.

ID

Issue or Limitation Description

GitHub / Salesforce Reference (if any)

Workaround (if any)

Affected Software Variants, Hardware, Modes, Host Interfaces

The Matter logs are printed to the UART interface by default. To view the logs use the Simplicity Studio console or a standalone terminal emulator such as PuTTY. The logging destination can be controlled by installing the "Logging To UART" or the "Logging to RTT" component under Matter -> Platform -> Utils in a Matter Studio project.

None

All

The Matter device images require approximately 700k in flash space. As a result, only a subset of EFR32MG2x devices are supported. For a complete list of devices supported, consult the documentation located at Matter Hardware Requirements.

None

All

A Matter SDK Issue: (https://github.com/project-chip/connectedhomeip): BLE Connection/Timeout error occurs occasionally during commissioning with the chip-tool running on Raspberry Pi or Linux (project-chip#16178). Running on these platforms requires an access point with both 2.4 GHz and 5 GHz capabilities. There is BLE-Wi-Fi interference when connected over the 2.4 GHz channel. This is resolved by connecting the chip-tool device to a 5 GHz SSID and the end device to a 2.4 GHz SSID for the same Wi-Fi network.

None

All

In some rare cases a Simplicity Studio project build may fail due to missing files in the zap-generated/ directory (e.g. "gen_config.h not found").

None

Delete the .zap folder in the home directory.

All

Incorrect state error sometimes while commissioning another fabric.

None

All

Window App device goes offline after commissioning with the Apple Ecosystem.

None

All

Unbolt feature is not supported via the ecosystems like Apple, Samsung and Amazon Alexa but it is supported by our device default due to which Unlock with these Ecosystem will fail. To disable unbolt feature, the feature bit for the DoorLock Cluster should be update from 0x1DB3 to 0xDB3.

None

All

1197733 1228823

Due to an electrical issue on the WPK main boards (BRD4002x), sometimes the current measurement value reported is wrong in the Energy Profiler, making it seem like an ICD is not going to sleep properly even though it is. This issue does not happen when using a WSTK (BRD4001x).

None

All

The configuration parameters for the internal storage bootloader used in the OTA software updates must always be custom-configured based on the actual image size for the given application. See https://docs.silabs.com/matter/2.6.0/matter-ota/01-ota-bootloader.

None

All

1370882

ConnectMaxTimeSeconds attribute (and others) exposed by ZAP even though it cannot be modified (read only). Work in progress in PR#36516.

None

All

1445664

Chip-Cert executable cannot be used in Windows installations of Simplicity Studio v5.

None

All

Matter/Thread: Silicon Labs has provided a complete image file for the Raspberry Pi that can be flashed onto an SD card to create the "Matter Hub", which is a Raspberry Pi running Ubuntu and includes a pre-built version of the Open Thread Border Router (OTBR) and chip-tool. The image we have provided is quite large, ~2 GB. As a result it can take quite a while to download the .zip file and flash it onto an SD card. Depending on your connection the process could take up to half an hour. Regardless, the demo and development experiences using this pre-built image is a much faster process than building the Matter Hub from scratch.

None

EFR32

Matter/Thread: Matter attestation credentials can conflict with Lockbits in Series 2, requiring moving the location of the attestation credentials when lockbits are used. Please see the guide Moving the Matter Attestation Credentials on Series 2 (MG24) for details. (1235425)

None

EFR32

1378481

USART for IO Stream (RTT) is not supported in Matter Extension v2.4.0-1.4

None

EFR32

1367027

Zigbee Matter Light, in rare occurrence, will momentarily fail to receive packages over 15.4 when utilizing BLE DMP with Thread. This may result in OTA update image transfer failures.

None

EFR32

1418676

Possible race condition in UART driver when excessive use of the Matter shell is performed (sending commands every 250 ms)

None

Reduce the command rate.

EFR32

1442643

In rare occurrences when OT traffic is high, the CMP app can hang when accessing secure element.

None

EFR32

1453646

Level attribute may get incorrectly changed on level-control stop.

None

EFR32

1256541

In high traffic environment, mDNS timeout is seen with SiWG917 SoC and SiWN917 NCP.

None

None

SiWx917

1200114

Observed CASE session timeout during sigma packet transaction while sending a unicast command with the Lock Sleepy app, which sometimes results in a resource busy error from the device (until the device commissioning times out).

None

None

SiWx917

Enabling "Logging to RTT" with SiWG917 SoC results in OTA update failure due to JLink connection preventing soft reset.

None

Enabled UART logging

SiWG917

1358324

The BRD4342A PSRAM support is enabled only for the text segment; it is not working for the data and bss segment.

None

None

BRD4342A

1366720

BLE scan issues are observed with Raspberry Pi when the distance between the device and the controller exceeds 3 meters in SQA lab environment.

None

None

SiWG917

1387498

Multi-admin test case fails for sleepy applications with Samsung ecosystems.

None

None

SiWG917

1436385

Observed a delay in controlling the device after power cycling the AP in the Google ecosystem.

None

None

SiWG917

The 917 SoC supports only 5 UULP pins, so components like BTN1, LEDs, J-Link, and the shell do not work with sleepy applications, as they are not mapped to UULP pins. When testing for certification, there may be a timeout due to slow response because of NVM3 being near full and causing repacks when a reply is expected.

None

Add more pages for NVM3

SiWG917

The P37 pin must be pulled up to enable the Matter shell or before executing any JLink command for sleepy applications.

None

None

SiWG917

1409219

On the BRD2605A board, RGB LED pins are not configurable via the LED component or Pin Tool, requiring manual updates to the RTE device file for any new LED pin configurations.

None

Hardware limitation.

SiWG917

1407412

The Matter over WiFi sample apps are currently hard coded to the US region per default.

None

Change the #define REGION_CODE from US to EU in Wifiinterface.cpp.

SiWG917

In EFR32MG24+WF200 device combination, WF200 Firmware exception is observed when both ICD and matter shell is enabled. In order to make matter shell to work for Lock application with this device combination, ICD is disabled.

None

Hardware limitation

SLEXP8022A - WF200 Wi-Fi Expansion Kit

The external bootloader should not be used with the EFR32MG24+RS9116/SiWN917 NCP device combination. Only use the internal bootloader.

None

None

SiWN917

OTA Update: sometimes boot loading with latest image does not work with WF200 with EFR32xG24 device combination. This issue is resolved by applying the workaround described in the Matter Wi-Fi FAQ.

None

None

SLEXP8022A - WF200 Wi-Fi Expansion Kit

SiWN917 NCP application OTA upgrade with upgraded WiSeConnect SDK may not be backward compatible with the existing TA.

None

None

SiWN917

Group commands only work for some specific access points when IGMP snooping is disabled.

None

None

All Wi-Fi boards

1085568

With EFR32 MG24 + RS9116 after going idle for some time, Apple devices may not be able to control an LED.

None

None

RS9116

When setting up the Ozone Debugger on Mac the location of the JLinkDevices.xml file has moved, Follow this documentation in order to place it in the proper location.

None

None

NA

1381843

LCD is disabled on RS9116 and SiWN917 NCP.

None

LCD is disabled.

1463849

The Device takes more than 3 minutes to reconnect after a power cycle.

None

None

SiWN917

1357133

Commissioning failed during the Wi-Fi Network Enable step.

None

None

SiWx917

1465345

The IDM test case returned an incorrect result for WF200, stating that the device supports Thread but does not support Wi-Fi.

None

None

SLEXP8022A - WF200 Wi-Fi Expansion Kit

1382232

Commissioning failed during the send complete step.

None

None

SiWG917

1327801

The IP address is still displayed after removing the fabric.

None

None

SiWG917

Commission into Matter/OT fails when building OTBR and NCP with low power

None

None

EFR32

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

None.

Migration Guide#

sl_main migration: See sl_system to sl_main migration guide for detailed instructions.

Using This Release#

What's in the Release? | Compatible Software | Installation and Use | Help and Feedback

What's in the Release?#

  • Silicon Labs Matter Extension for use with Simplicity Studio and SLC-CLI

  • Silicon Labs Matter sample applications

Compatible Software#

Software

Compatible Version or Variant

Simplicity SDK

2025.6.0

GCC (The GNU Compiler Collection)

12.2.1 (provided with Simplicity Studio)

Installation and Use#

To get started, download Simplicity Studio from the following link: https://www.silabs.com/developers/simplicity-studio, and install Simplicity SDK v2025.6.0 along with Silicon Labs Matter v2.6.0. For SiWx917, install WiSeConnect v3.5.0 as well.

Quick-start guides are provided for running pre-compiled demos and for building examples manually.

The Developer's Guide provides information on various technical topics.

For details on Studio project upgrades see Project Upgrades.

In order to run Matter over Thread, a developer must have a Silicon Labs EFR-based device and either:

  • another EFR-based device and a Raspberry Pi with a 32 GB SD Card

  • or an ecosystem device with OpenThread Border Router capabilities such as Amazon Echo, Apple HomePod, Samsung SmartThings Hub or Google Nest Hub Wi-Fi.

In order to run Matter over Wi-Fi, a developer must have the following hardware:

  • Silicon Labs Wireless starter/development kit which is mentioned below.

  • Raspberry Pi with a 32 GB SD Card or an ecosystem with Matter support To run your first demo, see our Getting Started Guides.

To kick start your development, see our Developer's Guide.

For information about Secure Vault Integration, see Secure Vault.

To review Security and Software Advisory notifications and manage your notification preferences:

  1. Go to https://community.silabs.com/.

  2. Log in with your account credentials.

  3. Click your profile icon in the upper-right corner of the page.

  4. Select Notifications from the dropdown menu.

  5. In the Notifications section, go to the My Product Notifications tab to review historical Security and Software Advisory notifications

  6. To manage your preferences, use the Manage Notifications tab to customize which product updates and advisories you receive.

To learn more about the software in this release, dive into our online documentation.

Help and Feedback#

Note: Ask AI is experimental.

SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.

Additional Information#

Existing Examples#

Matter over Thread is supported in Simplicity Studio for the following applications:#

  • Light

  • Light Switch

  • Lock

  • Window Covering

  • Thermostat

  • OnOff Plug

  • Sensor

  • Dishwasher

  • Air Quality Sensor

  • Refrigerator

  • Zigbee Matter Light

Matter over Wi-Fi is supported in Simplicity Studio for the following applications:#

  • SoC and Dev Kit supported applications:

    • Light

    • Lock

    • Light Switch

    • Window Covering

    • OnOff Plug

    • Thermostat

    • Dishwasher

    • Air Quality Sensor

    • Sensor

    • Fan Control

    • Refrigerator

  • NCP supported applications:

    • Lock

    • Thermostat

    • Window Covering

      • Note: SiWN917 NCP is the only device combination which supports Window Covering App.

Matter over Wi-Fi ICD is supported for the following applications:#

  • Lock (ICD is enabled by default)

    • With chip-tool

    • With EFR32xG24 with SiWN917 in NCP mode

  • Window Covering (ICD is enabled by default)

    • With chip-tool

    • With EFR32xG24 with SiWN917 in NCP mode

  • Thermostat

    • With chip-tool

    • With EFR32xG24 with RS9116, SiWN917 in NCP mode

  • Light Switch

    • With chip-tool

    • With SiWG917 SoC

Reference guide to enable the sleepy functionality for Wi-Fi: Wi-Fi ICD.

Ecosystems#

This release has been tested and proven to work for commissioning and control with the following Ecosystems on the hardware and software versions listed below:

Google#

Silicon Labs Device

Application

Hub

Phone

App Software

Wi-Fi Access Point

Thread

BRD4187C

lighting/Lock/Window/Multi-sensor-app

Hardware: Google Nest Hub, Model : GUIK2 Software: Hub SoftwareChromcast 3.76.463359

Hardware: OPPO Reno CPH1919 Software: Android version 12

Google Home version: 3.30.1.6

ASUS (Model: XT8)

Wi-Fi

SiWx917 SoCBRD4338A

lighting/Lock/Window/Multi-sensor-app

Hardware: Google Nest Hub, Model : GUIK2 Software: Hub Software Version: Chromcast 3.76.463359

Hardware: OPPO Reno CPH1919 Software: Android version 12

Google Home version: 3.30.1.6

ASUS (Model: XT8)

Apple#

Silicon Labs Device

Application

Hub

Phone

App Software

Wi-Fi Access Point

Thread

BRD4187C

lighting/Lock/Window/Multi-sensor-app

Hardware: Home Pod MiniSoftware: 18.5 (22L572)

Hardware: iPhone 12 pro Software: 17.6

Apple Home17.6.1

ASUS (Model: XT8)

Wi-Fi

SiWx917 SoC

lighting/Lock/Window/Multi-sensor-app

Hardware: Home Pod MiniSoftware: 18.5 (22L572)

Hardware: iPhone 12 proSoftware : 17.6

Apple Home17.6.1

ASUS (Model: XT8)

Amazon#

Silicon Labs Device

Application

Hub

Phone

App Software

Wi-Fi Access Point

Thread

BRD4187C

lighting/Window/Multi-sensor-app

Hardware: Echo 4th Gen Model: L4S3RE Software: Hub Software Version: 11779349892

Hardware: OPPO Reno CPH1919 Software: Android version 12

Alexa version: 2.2.6607727

ASUS (Model: XT8)

Wi-Fi

SiWx917 SoCBRD4338A,

lighting/lock/Window/Multi-sensor-app

Hardware: Echo 4th Gen Model: L4S3RE Software: Hub Software Version: 11779349892

Hardware: OPPO Reno CPH1919 Software: Android version 12

Alexa version: 2.2.6607727

ASUS (Model: XT8)

Samsung#

Silicon Labs Device

Application

Hub

Phone

App Software

Wi-Fi Access Point

Thread

BRD4187C

lighting/lock/Window/Multi-sensor-app

Hardware: SmartThings Station Software: Hub Software Version: 000.052.00009 Hardware: Charging Hub Software Controller version: 1.0.15-5

Hardware: Pixel 5a Software: Android version 14

SmartThings Version: 1.7.19.19

ASUS (Model: XT8)

Wi-Fi

SiWx917 SoCBRD4338A,

lighting/lock/Window/Multi-sensor-app

Hardware: SmartThings Station Software: Hub Software Version: 000.056.00011

Hardware: OPPO Reno CPH1919 Software: Android version 12

SmartThings Version: 1.8.29.24

ASUS (Model: XT8)

Project Upgrades#

  • Upgrades of pre-2.4.0-1.4 projects based on the Lighting application require the that user manually removes the references to OnOffSwitchConfiguration from ZclCallbacks.cpp.

  • An upgrade of an existing Studio project from Matter 2.2.2-1.2 or earlier to the current version of the extension is not supported.

  • The Simplicity Studio project upgrade dialog can be exited only by closing the project tab (clicking on the "x" button in the top right corner).

  • The Multi-Sensor sample application is has the ICD feature enabled by default in this release. It is recommended that the user enables ICD in the Multi-Sensor projects upgraded to the current release.

  • The Matter and Zigbee SoC Light application does not support project upgrades to the current release.

  • When upgrading a Studio project to the current release the following changes are required:

    • Modify AppTask.cpp/AppTask.h in the project's src and include directory:

      • Rename AppTask::Init() to AppTask::AppInit()

      • remove the following from AppInit():

    err = BaseApplication::Init();

if (err != CHIP_NO_ERROR) { SILABS_LOG("BaseApplication::Init() failed"); appError(err); }

Matter Software Artifacts#

Matter Software Artifacts: https://docs.silabs.com/matter/2.6.0/matter-prerequisites/matter-artifacts.