Bluetooth LE - 802.15.4 Mesh + BLE Multiprotocol Version 11.1.0 (Jun 23, 2026) - Release Notes#
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 11.1.0#
Concurrent Multiprotocol (CMP) co-processor sample applications running Zigbee NCP, OpenThread RCP, and Bluetooth RCP
ZigbeeD + OTBR support on Android 15 – Alpha
Standardized Multiprotocol sample application names, project layout, and Simplicity Studio display titles
Reorganization of multiprotocol packages: file paths of components and applications have been re-organized to give multiprotocol packages a more cohesive file structure
API Changes#
sl_802154_radio_set_scheduler_priorities() has been removed.
Bug Fixes#
Fixed in 11.1.0#
Targeted quality improvements and bug fixes across Zigbee + OpenThread + BLE Dynamic Multiprotocol and Concurrent Multiprotocol applications on Series 2 and Series 3 devices.
Chip Enablement#
Added in 11.1.0#
xG2B: Added Alpha software support for xG2B devices in Multiprotocol.
Key Features#
New Features | Enhancements | Removed Features | Deprecated Features
New Features#
Added in 11.1.0#
CMP + BLE-RCP sample applications (Zigbee NCP + OpenThread RCP + Bluetooth RCP)#
Added new Concurrent Multiprotocol (CMP) co-processor sample projects that run Zigbee NCP, OpenThread RCP, and Bluetooth RCP on one EFR device. The Bluetooth side exposes a BLE controller over CPC so a Linux host can use the Silicon Labs RCP with CPCd and a standard Bluetooth stack (i.e. BlueZ). Zigbee and OpenThread host applications use the same CPC multiplexer model as existing NCP / RCP designs.
Variants:
Project | Host link |
|---|---|
| UART (VCOM-style link; configurable baud / flow control) |
| SPI |
Details:
CPC multiplexes Zigbee NCP, OpenThread RCP, and BLE HCI over a single physical interface (UART or SPI) to the host.
BLE is included as Bluetooth controller + HCI over CPC (
bluetooth_hci_cpc), suitable for pairing with host-side CPC and Bluetooth middleware.Zigbee NCP behavior aligns with existing
zigbee_ncp_cpc-based samples; optional NCP extensions remain supported as described in the project description.OpenThread is provided as RCP with
ot_ncp_cpcfor Spinel / CPC toward the host.Bluetooth Controller component configuration was added and updated for RCP applications, including the new
SL_BTCTRL_RTOS_LINK_LAYER_TASK_STACK_SIZEparameter in the.slcpfiles (minimum value 1100 on Series 2, default 1400 on Series 3) to allow fine-tuning the BLE link-layer task stack size based on application requirements.
ZigbeeD + OTBR on Android 15 — Alpha#
Added Alpha support for Android 15 host development with Multiprotocol. The release includes ZigbeeD libraries and the source code needed to build the ZigbeeD and OpenThread Border Router (OTBR) host applications. The Android-15 host build uses NDK r27d and ships through dedicated container and packaging scripts.
Enhancements#
Changed in 11.1.0#
Standardized Multiprotocol sample application names#
Standardized Multiprotocol sample application names across Simplicity Studio labels, SLCP project_name values, filenames, and directory layout under multiprotocol_app/. The coordinated scheme groups examples by protocol combination and architecture, uses a common mp- prefix for all project names, and aligns display titles with the SiSDK / GSDK example-app naming effort.
Directory structure — examples are organized under multiprotocol_app/ by protocol combination (ot-ble/, zb-ble/, zb-ot/, zb-ot-ble/), then by architecture (soc/, ncp/, ncp-rcp/, rcp/). UART / SPI transport variants share a subdirectory; minimal variants share a subdirectory with their base sample.
project_name / path renames (21 applications):
OpenThread + BLE (
ot-ble/):ot-ble-dmp → mp-ot-ble-soc;ot-ble-dmp-no-buttons → mp-ot-ble-soc-minimal;ot-ble-dmp-tz-ns → mp-ot-ble-soc-tz;ot-ble-dmp-multi-instance → mp-ot-ble-soc-multi-instance;ot-ncp-ftd-ble-rcp → mp-ot-ncp-ble-rcp.Zigbee + BLE (
zb-ble/):zigbee_ble_dynamic_multiprotocol_light → mp-zb-ble-soc-light(plus-minimal,-sed,-sed-minimalvariants);zigbee_ble_direct_device_light → mp-zb-ble-soc-zdd-light;zigbee_ncp-ble_ncp-uart/spi → mp-zb-ble-ncp-uart/spi.Zigbee + OpenThread (
zb-ot/):z3-light_ot-ftd_soc → mp-zb-ot-soc-light;zigbee_ncp-ot_rcp-uart/spi → mp-zb-ncp-ot-rcp-uart/spi;zigbee_ncp_ot_rcp_uart_gp_multi_rail → mp-zb-ncp-ot-rcp-uart-gp.Zigbee + OpenThread + BLE (
zb-ot-ble/):zigbee_ncp-ot_rcp-ble_rcp-uart/spi → mp-zb-ncp-ot-rcp-ble-rcp-uart/spi;rcp-uart/spi-802154-blehci → mp-zb-ot-ble-rcp-uart/spi.
Label updates — display titles now follow a consistent pattern: protocol names spelled out, architecture and transport where applicable, and explicit protocol-role coupling for mixed-role co-processor apps (e.g. "Zigbee NCP + OpenThread RCP - UART (CMP)" instead of legacy titles such as "Zigbee - NCP + OpenThread - RCP …" or "Multiprotocol (OpenThread+Zigbee+BLE) - RCP (SPI)"). DMP (Dynamic Multiprotocol) and CMP (Concurrent Multiprotocol) are noted in labels or descriptions where relevant.
Naming convention — all project names use the mp-{protocols}-{arch}[-{transport}][-{usecase}][-{variant}] pattern with hyphens throughout; protocols are ordered Zigbee, OpenThread, then BLE; mixed-role co-processor apps couple each protocol to its role (e.g. mp-zb-ncp-ot-rcp-uart).
Multiprotocol package reorganization#
The file paths of components and applications inside multiprotocol packages have been re-organized to give those packages a more cohesive file structure. This should not affect how the content is displayed in Simplicity Studio.
Removed Features#
None.
Deprecated Features#
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#
Removed in 11.1.0#
Removed API Name | Was Deprecated? |
|---|---|
| Yes |
Deprecated APIs#
None.
Bug Fixes#
Fixed in 11.1.0#
| ID | Issue Description | GitHub / Salesforce Reference (if any) | Affected Software Variants, Hardware, Modes, Host Interfaces |
|---|---|---|---|
| 1569320 | Fixed an issue where CPCd could crash after a BLE scan with an active OT network in the mp-ot-ncp-ble-rcp application. Updated SL_BTCTRL_RTOS_LINK_LAYER_TASK_STACK_SIZE to 1100 for Series 2 devices. Note: RTOS stack sizes require tuning as needed. |
N/A | mp-ot-ncp-ble-rcp app on Series 2 devices |
| 1602054 | Disabled the serial task on the OT-NCP + BLE-RCP application so that otbr-agent can start correctly with the mp-ot-ncp-ble-rcp application. |
N/A | mp-ot-ncp-ble-rcp app |
| 1613155 | Fixed an issue where projects using the zigbee_stack_unix component and built with the "Copy all sources" option were missing certain header files, causing ZigbeeD make to fail with sl_token_manager_api.h: No such file or directory. |
SF: 00340128 | ZigbeeD host builds with Copy All Sources |
| 1619616 | Fixed an intermittent failure when performing Update Trust Center Link Key in multi-hop scenarios, where the Trust Center could fail to handle the first Request Key (Trust Center Link Key) of the joining devices. | N/A | Zigbee + BLE DMP large-topology deployments |
| 1628216 | Fixed an issue where the Zigbee libraries for Android 12 were not being included in projects. All host architectures that the Zigbee libraries are built for currently use the toolchain_gcc SLC component. |
N/A | ZigbeeD sample on Android 12 |
| 1639647 | Fixed a CPC issue where the HCI Bridge could fail to start properly after a host reconnection to the remote device when using the mp-zb-ncp-ot-rcp-ble-rcp application. |
N/A | CMP mp-zb-ncp-ot-rcp-ble-rcp app on MG24 |
| 1652601 | Fixed an IPC issue affecting throughput testing with large packets (127 bytes) on the Zigbee Direct Device Light (ZDDLight) sample application. | N/A | Zigbee Direct Device Light app on DMP / CMP configurations |
Chip Enablement#
Added in 11.1.0#
xG2B: Added Alpha software support for xG2B devices in Multiprotocol.
Application Example Changes#
New Examples | Modified Examples | Removed Examples | Deprecated Examples
New Examples#
Added in 11.1.0#
| Example Name | Description | Supported Software Variants (if applicable) | Supported Modes | Supported OPNs / Boards / OPN Combinations | Supported Host Interfaces |
|---|---|---|---|---|---|
|
See readme in |
New Concurrent Multiprotocol (CMP) co-processor sample applications. Zigbee NCP, OpenThread RCP, and Bluetooth RCP run on one EFR device, multiplexed over CPC to a Linux host. Bluetooth is exposed as a BLE controller over CPC via bluetooth_hci_cpc, suitable for pairing with host-side CPC and a standard Bluetooth stack (i.e. BlueZ). |
N/A | NCP / RCP |
All supported parts with sufficient RAM (≥ 128 KB) |
|
Modified Examples#
Modified in 11.1.0#
All Multiprotocol sample application project names, paths, and Simplicity Studio display titles have been standardized as part of the SiSDK / GSDK example-app naming effort. See the Standardized Multiprotocol sample application names enhancement above for the full list of renames, the new directory layout under multiprotocol_app/, and the unified mp-{protocols}-{arch}[-{transport}][-{usecase}][-{variant}] naming convention. Existing projects upgrading to 3.1.0 must be regenerated to pick up the new paths and project names.
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. | N/A | 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. | N/A | 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. | N/A | 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. | N/A | This will be fixed in future releases. | Coex-enabled RCP |
| 1514786 | Wi-Fi coexistence on SiXG301 is currently not supported. Other references: 1514794, 1515385. |
N/A | This will be supported in future releases. | SiXG301 devices |
| 1619497 | The sample app mp-zb-ncp-ot-rcp-spi over SPI may fail to form an OT network after a Zigbee connection is established. |
N/A | None | Series-3 xG301 devices with mp-zb-ncp-ot-rcp-spi app over SPI |
| 1639512 | In the Z3GatewayCPC host with the mp-zb-ncp-ot-rcp-ble-rcp use case, Z3GatewayCPC may crash if Zigbee and BLE protocols are under heavy load and OTBR is restarted. |
N/A | This will be fixed in a future release. | CMP mp-zb-ncp-ot-rcp-ble-rcp app on MG24 (BRD4187C / BRD4186C) |
| 1651620 | In Simplicity Studio 6, the Zigbee ARM64 component, along with other Zigbee and Platform components for building with ARM Linux host architectures, may not appear in the Software Components tab when generating zigbeed and other host projects. This may also prevent these projects from compiling at initial generation time, since these components contain the Zigbee libraries for a given architecture. | N/A | Check which target part the host project is using; if it says None, change it to an actual host target like LINUX_32 or LINUX_64 and the relevant components should become selectable. |
Simplicity Studio 6 ZigbeeD and other ARM Linux host projects |
| 1674274 | The mp-zb-ot-soc-light CMP application may fail to start Zigbee on a different channel after an OpenThread network is already running when built with HDR PHY, fast channel switching (FCS), and RX duty cycling (DC). This is a specific corner case; same-channel operation and the reverse startup order are not affected. |
N/A | Start Zigbee first, or use the same channel for Zigbee and OpenThread. | CMP mp-zb-ot-soc-light app with HDR PHY + FCS + DC on BRD4407A / SiXG301 |