Bluetooth Mesh Version 9.0.0 (June 16, 2025) - Release Notes#

Simplicity SDK Version 2025.6.0

Bluetooth Mesh is a standards-based, many-to-many communication topology available for Bluetooth Low Energy (LE) devices, optimized for large-scale networks and ideally suited for building automation, sensor networks, and asset tracking.

Click here for earlier releases.

Release Summary#

Release Item	Version	Release Date	Release Notes	Key Features	API Changes	Bug Fixes	Chip Enablement
SDK	9.0.0	June 16, 2025	Release Notes	Improved formatting of model configuration data that is stored on the device.	Added API for migrating existing model configuration data to new format that provides more flexibility for DFU. Fixed API issues for configuration client, proxy solicitation, and scene model deinitialization. Removed deprecated test APIs.	Corrected a number of remote provisioning issues. Corrected a number of generic, lighting, and LC model issues. Fixed API issues for configuration client, proxy solicitation, and scene model deinitialization.	None
iOS ADK	9.0.0	June 16, 2025	Release Notes	None	None	None	None
Android ADK	9.0.0	June 16, 2025	Release Notes	None	None	None	None

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

Change	Impact	Affected Software Variants if applicable	Affected Modes	Affected OPNs / Boards / OPN Combinations	Affected Host Interfaces
Removal of the provisioner API call sl_btmesh_prov_test_identity	The API call needs to be replaced with sl_btmesh_node_test_identity.	N/A	All	All	All
Removal of the test API call sl_btmesh_test_set_adv_scan_params	The API call needs to be replaced with sl_btmesh_test_set_adv_params and sl_btmesh_test_set_scan_params	N/A	All	All	All
Removal of the test API call sl_btmesh_test_set_segment_send_delay	The API call needs to be replaced with sl_btmesh_sar_config_server_set_sar_transmitter and sl_btmesh_sar_config_server_set_sar_receiver	N/A	All	All	All
Removal of the test API call sl_btmesh_test_set_sar_config	The API call needs to be replaced with sl_btmesh_sar_config_server_set_sar_transmitter and sl_btmesh_sar_config_server_set_sar_receiver	N/A	All	All	All
Change of default storage format for model configuration data	No impact on new projects. Old projects can choose to either migrate to the new storage format after a firmware update, using the supplied migration component, or keep using the old storage format. The old storage format component is not the default and must be chosen to be used.	N/A	All	All	All

Migration Guide#

See Transitioning from the v1.x to v2.x Bluetooth Mesh SDK for a guide on how to migrate from SDK version 1.x to newer versions.

The API Reference Guide provides guidance on replacing currently deprecated API calls with supported calls before deprecated APIs are removed.

Using This Release#

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

What's in the Release?#

Compatible Software#

Software	Compatible Version or Variant
Simplicity SDK	2025.6.0
Simplicity Studio	5.11.0.0
Simplicity Commander	1.18.2 (provided with Simplicity Studio)
GCC (The GNU Compiler Collection)	12.2.1 (provided with Simplicity Studio)
IAR Embedded Workbench for ARM (IAR-EWARM)	9.40.1

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 here.

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

Go to https://community.silabs.com/.
Log in with your account credentials.
Click your profile icon in the upper-right corner of the page.
Select Notifications from the dropdown menu.
In the Notifications section, go to the My Product Notifications tab to review historical Security and Software Advisory notifications
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 here.

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

Help and Feedback#

Contact Silicon Labs Support.
To use our Ask AI tool to get answers, see the search field at the top of this page.
Note: Ask AI is experimental.
Get help from our developer community.

Feature Matrix#

Bluetooth Mesh SDK Version 9.0.0 implements the following specifications:

Mesh Protocol 1.1
Mesh Model 1.1
Mesh Binary Large Object Transfer Model 1.0
Mesh Device Firmware Update Model 1.0
Ambient Light Sensor NLC Profile 1.0.1
Basic Lightness Controller NLC Profile 1.0.1
Basic Scene Selector NLC Profile 1.0.1
Dimming Control NLC Profile 1.0.1
Occupancy Sensor NLC Profile 1.0.1
Energy Monitoring NLC Profile 1.0.1

Supported Features | Unsupported Features

Supported Features#

Feature Name	Description	Quality	Related API Names	Supported Software Variants, Hardware, Modes, Host Interfaces	Related Example Names
Mesh node	Base functionality to implement a Mesh network node.	GA	sl_btmesh_node	All	All examples (except btmesh_host_provisioner)
Mesh provisioner	Base functionality to implement a Mesh network provisioner.	GA	sl_btmesh_provisioner	All	Bluetooth Mesh - NCP Empty btmesh_host_provisioner
Mesh GATT proxy	GATT proxy connectivity	GA	sl_btmesh_proxy sl_btmesh_proxy_client sl_btmesh_proxy_server	All	All examples
Mesh On-demand GATT proxy models	Models for configuring and activating on-demand GATT proxy functionality	GA	sl_btmesh_on_demand_private_proxy_client sl_btmesh_on_demand_private_proxy_server sl_btmesh_solicitation_config_client	All	Bluetooth Mesh - NCP Empty
Low Power Node	Implementation of low-power node (a node that is mostly in power saving mode during operation)	GA	sl_btmesh_lpn	All	Bluetooth Mesh - SoC Switch CTL Bluetooth Mesh - SoC Sensor Thermometer Bluetooth Mesh - NLC Occupancy Sensor Bluetooth Mesh - NLC Ambient Light Sensor Bluetooth Mesh - NLC Dimming Control Bluetooth Mesh - NLC Basic Scene Selector
Friend Node	Implementation of friend node (a companion for a low-power node)	GA	sl_btmesh_friend	All	Bluetooth Mesh - SoC Sensor Client Bluetooth Mesh - NLC Basic Lightness Controller Bluetooth Mesh - SoC Light HSL Bluetooth Mesh - SoC DFU Distributor
Mesh Configuration Client model	Client model for remote configuration of mesh configuration parameters	GA	sl_btmesh_config_client	All	Bluetooth Mesh - NCP Empty
Silicon Labs configuration models	Client and server models for remote configuration of Silicon Labs specific configuration parameters	GA	sl_btmesh_silabs_config_client sl_btmesh_silabs_config_server	All	Bluetooth Mesh - NCP Empty
Mesh Health models	Mesh health client and health server model implementations	GA	sl_btmesh_health_client sl_btmesh_health_server	All	All examples (except Bluetooth Mesh - SoC Empty)
Mesh Generic and Lighting models	Mesh generic and lighting client and server model implementations	GA	sl_btmesh_generic_client sl_btmesh_generic_server	All	All examples (except Bluetooth Mesh - SoC Empty)
Mesh Lighting Control models	Mesh lighting control (LC) client and server model implementations, for implementing sensor-driven dimming	GA	sl_btmesh_lc_client sl_btmesh_lc_server sl_btmesh_lc_server	All	Bluetooth Mesh - NLC Basic Lightness Controller
Mesh Sensor models	Mesh sensor client and server model implementations	GA	sl_btmesh_sensor_client sl_btmesh_sensor_server sl_btmesh_sensor_setup_server	All	Bluetooth Mesh - SoC Sensor Thermometer Bluetooth Mesh - SoC Sensor Client Bluetooth Mesh - NLC Occupancy Sensor Bluetooth Mesh - NLC Ambient Light Sensor
Mesh Scene models	Mesh scene client and server model implementations	GA	sl_btmesh_scene_client sl_btmesh_scene_server sl_btmesh_scene_setup_server	All	Bluetooth Mesh - NLC Basic Scene Selector
Mesh Scheduler models	Mesh scheduler client and server model implementations	GA	sl_btmesh_scheduler_client sl_btmesh_scheduler_server	All	Bluetooth Mesh - NLC Basic Lightness Controller
Mesh Time models	Mesh time client and server model implementations	GA	sl_btmesh_time_client sl_btmesh_time_server	All	Bluetooth Mesh - NLC Basic Lightness Controller
Mesh Vendor models	Support for implementing vendor models in applications	GA	sl_btmesh_vendor_model	All	Bluetooth Mesh - NCP Empty
Mesh Remote Provisioning models	Remote Provisioning client and server models	GA	sl_btmesh_remote_provisioning_client sl_btmesh_remote_provisioning_server	All	btmesh_host_provisioner
Mesh SAR Configuration models	Models for remote configuration of segmentation and Reassembly (SAR) parameters	GA	sl_btmesh_sar_config_client sl_btmesh_sar_config_server	All	Bluetooth Mesh - SoC DFU Distributor
Mesh Private Beacon models	Models for remote configuration of private beaconing	GA	sl_btmesh_private_beacon_client sl_btmesh_private_beacon_server	All	Bluetooth Mesh - NCP Empty
Mesh Large Composition Data models	Models for large composition data retrieval	GA	sl_btmesh_lcd_client sl_btmesh_lcd_server	All	Bluetooth Mesh - NCP Empty
Binary Large Object Transfer models	Models for Binary Large Object Transfer (BLOB) functionality	GA	sl_btmesh_mbt_client sl_btmesh_mbt_server	All	All examples (except Bluetooth Mesh - SoC Empty)
Device Firmware Update models	Models for Device Firmware Update (DFU) functionality	GA	sl_btmesh_fw_update_client sl_btmesh_fw_update_server sl_btmesh_fw_dist_client sl_btmesh_fw_dist_server sl_btmesh_fw_standalone_updater	All	All examples (except Bluetooth Mesh - SoC Empty)
Test and diagnostic commands	Test commands to aid development	GA	sl_btmesh_diagnostic sl_btmesh_test sl_btmesh_ncp_fw_list	All	Bluetooth Mesh - NCP Empty
Migration support	Commands to migrate existing device data to currently supported formats after firmware update	GA	sl_btmesh_migration sl_btmesh_model_migration	All	None

Unsupported Features#

Mesh Protocol: Directed Forwarding
Mesh Protocol: Subnet Bridging
Mesh Protocol: Opcode Aggregation
Mesh Model: xyL Models

SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.