OpenThread - 802.15.4 Mesh + BLE Multiprotocol Version 2.7.1 (July 21, 2025) - Release Notes#

OpenThread Version 2.7.1

Simplicity SDK Version 2025.6.1

This document provides release information for the 802.15.4 Mesh + BLE Multiprotocol SDK.

Click here for earlier releases.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

Added in 2.7.1#

None.

Added in 2.7.0#

  • ZigbeeD, OTBR and BLE support on OpenWRT – GA

  • Zigbee + BLE DMP support on EFR32xG29 - GA

API Changes#

None.

Bug Fixes#

Fixed in 2.7.1#

Targeted quality improvements and bug fixes.

Fixed in 2.7.0#

  • Multipan RCP Improvements

  • Zigbee-NCP + OpenThread-RCP Improvements

  • Zigbee-BLE DMP Improvements

  • Targeted quality improvements and bug fixes

Chip Enablement#

None.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

Added in 2.7.1#

None.

Added in 2.7.0#

Add zigbeed option flag to point to zigbeed.conf

Enhancements#

Changed in 2.7.1#

None.

Changed in 2.7.0#

The RAIL 802.15.4 Multiplexer, 802.15.4 Unified radio scheduler priority and Spinel Host Interface - CPC components are now showing up under the 802.15.4 high-level category in Simplicity Studio.

Removed Features#

None.

Deprecated Features#

None.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None

Modified APIs#

None

Removed APIs#

Removed in 2.7.1#

None.

Removed in 2.7.0#

Removed API Name

Was Deprecated?

sl_sec_man_init

Yes

Deprecated APIs#

Removed in 2.7.1#

None.

Deprecated in 2.7.0#

Deprecated API Name

Planned Removal Date

sl_802154_radio_set_scheduler_priorities

2025 Dec

Bug Fixes#

Fixed in 2.7.1#

ID Issue Description GitHub / Salesforce Reference (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1471746 Fixed an issue where the Zigbee + Bluetooth NCP application examples would not show in Simplicity Studio. None Zigbee+BLE NCP apps

Fixed in 2.7.0#

ID Issue Description GitHub / Salesforce Reference (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1363050 Zigbee stack initialization no longer activates the radio (or RCP for host stacks) prior to stack APIs being called by the application. This prevents unwanted multi-PAN operation on Channel 11 (the default channel) when using a multi-PAN-capable RCP configuration. (Other ref: 1390725) SF: 00320314 All apps utilizing Zigbee
1366854 Fixed an issue where a CPC message from an RTOS-enabled RCP to host could be waiting in a send queue until something woke up the serial task. None All RCP apps utilizing CPC
1375724 Fixed a race condition on the multipan RCP that resulted in a transmit complete message not being returned to the host, causing a 5 second pause in further transmissions prior to recovering. None All RCP apps
1378298 Fixed an issue that caused a crash when entering keys print on an DMP Light app with LTO enabled. None All SoC apps
1381165 Fixed an issue where disabling PTA on Zigbee-NCP + OT-RCP could cause NCP/RCP to reset. None All CMP NCP+RCP apps
1393057 Fixed an issue where sample project generations for Zigbee-NCP + OpenThread-RCP (UART & SPI) and Zigbee-NCP + BLE-NCP (UART & SPI) were allowed on parts with insufficient RAM. SF: 00322443 CMP NCP+RCP and DMP ZB+BLE apps
1399687, 1426191 Fixed an issue where the Zigbee-BLE DMP Light app wouldn't go to EM2 sleep. SF: 00326199, 00326520 All DMP apps

Chip Enablement#

None.

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

New Examples#

None.

Modified Examples#

Modified in 2.7.1#

None.

Modified in 2.7.0#

Example Name Changes Supported Software Variants if applicable Supported Modes Supported OPNs / Boards / OPN Combinations Supported Host Interfaces

Zigbee - BLE Dynamic Multiprotocol Light SED

See sample here

    The Zigbee BLE - DynamicMultiprotocolLightSed sample project can now be built for boards with only one LED if the LED1 component is excluded from the project.
 N/A N/A N/A N/A

Zigbeed

See sample here
    The Zigbeed sample application is now extended with the --conf parameter, so the location of the zigbeed.conf is now configurable and not being hardcoded to /usr/local/etc/zigbeed.conf
 N/A N/A N/A N/A

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#

ID Issue or Limitation Description GitHub / Salesforce Reference (if any) Workaround (if any) Affected Software Variants, Hardware, Modes, Host Interfaces
1209958 The Zigbee + OpenThread + BLE RCP may stop working in endurance testing (~2 hours) on MG24 and MG21 devices with constant and concurrent traffic on all three stacks. None None Zigbee + OpenThread + BLE RCP app
1385052 Coex-enabled RCP may still occasionally transmit TX ACK after losing the Grant even when Acking is disabled and TX Abort is enabled. None This will be fixed in future releases. Coex-enabled RCP
1385486 TX from coex-enabled RCP may infrequently happen without the request after turning on the non-802.15.4 compliant MAC Holdoff coex option. None This will be fixed in future releases. Coex-enabled RCP
1457086 Coex-enabled EFR32MG24 RCP may sometimes output higher than expected grant denied counts in the PTA counters. None This will be fixed in future releases. Coex-enabled RCP