Amazon Sidewalk Version 2.9.1 - Release Notes (Jul 29, 2026)#

Amazon Sidewalk is a secure, low-bandwidth, long-range wireless protocol designed to connect smart devices and extend their range beyond standard Wi-Fi or Bluetooth. It enables seamless connectivity for IoT devices in homes and neighborhoods, supporting features like device tracking, smart lighting, and sensor networks.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

Added in 2.9.1#

None

Added in 2.9.0#

  • Cloud Light SoC Sample application.

  • Supporting new Temperature sensor on WPK board.

  • Application tab enablement in Sidewalk Assistant.

  • Updated libraries to Amazon Stack 1.19.4.

  • Stability improvements.

API Changes#

None

Bug Fixes#

Fixed in 2.9.1#

  • Fixing on device certification generation flow in pdp

  • Fixing build in Cloud Light sample app for boards with less than 2 LEDs

Fixed in 2.9.0#

  • Fixing Endpoint capability report producing an extra transmission (TX) message after changing profiles.

  • Fixing an issue with the gwscan start command in the Qualification application.

Chip Enablement#

None

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

None

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#

None

Chip Enablement#

None.

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

New Examples#

None

Modified Examples#

None

Removed Examples#

None

Deprecated Examples#

None

Known Issues and Limitations#

None.

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

None.

Migration Guide#

Starting with Sidewalk 2.9.0, the manufacturing store configuration in app_main.c must provide a function pointer for app_value_to_offset in sid_pal_mfg_store_region_t. Assigning the literal 0xffffffff to that field is no longer valid.

This change is required for CMake builds. This toolchain enforces correct function-pointer types in struct initializers; treating app_value_to_offset as an integer constant will fail to compile or produce errors under stricter type checking.

If your project does not extend the manufacturing store with application-specific values, add a stub implementation that returns SID_PAL_MFG_STORE_INVALID_OFFSET (0xFFFFFFFF) for every value, and wire it into mfg_config as shown below.

Before (Sidewalk 2.8.2 and earlier):

static const sid_pal_mfg_store_region_t mfg_config = {
  .app_value_to_offset = 0xffffffff,
};

After (Sidewalk 2.9.0):

uint32_t mfg_store_app_value_to_offset(int value)
{
  (void)value;
  return 0xFFFFFFFF;  /* SID_PAL_MFG_STORE_INVALID_OFFSET — no app-specific mfg values */
}

static const sid_pal_mfg_store_region_t mfg_config = {
  .app_value_to_offset = mfg_store_app_value_to_offset,
};

If your application does map custom manufacturing values (identifiers greater than SID_PAL_MFG_STORE_CORE_VALUE_MAX), replace the stub body with your existing offset logic instead of always returning 0xFFFFFFFF. The function signature must match sid_pal_mfg_store_app_value_to_offset_t in sid_pal_mfg_store_ifc.h.

Using This Release#

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

What's in the Release?#

The Sidewalk MCU SDK v2.9.1 release contains bug fixes only for PDP and Cloud Light applications.

Compatible Software#

Software Compatible Version or Variant
Simplicity SDK Simplicity SDK 2026.6.1
Amazon Sidewalk SDK 1.19.4

Installation and Use#

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.

For recommended settings, configurations, and usage guidelines, see our Developer's Guide.

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

Help and Feedback#

Feature Matrix#

Unsupported Features#

  • Sidewalk Bulk Data Transfer (SBDT): Sidewalk BLE integrated OTA mechanism is available in our Sidewalk alpha repository, as it is not publicly accessible on the Amazon AWS side.

  • Switched Multiprotocol (SMP): Sidewalk, BLE, Z-Wave SMP PoC are available in our alpha repository.

SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.