The Silicon Labs Gecko SDK (GSDK) is a single integrated package of 32-bit IoT product software development kits (SDKs) and Gecko platform. It is the primary tool for development in the Silicon Labs IoT Software ecosystem. It provides many powerful features to offer a seamless experience which includes ultra-low power consumption, strong network reliability, Industry-leading ability to support a large number of nodes, and abstraction of complex requirements like multiprotocol and pre-certification. The GSDK is covered by one of several different licenses with the default license of Master Software License Agreement (MSLA). Silicon Labs also extends over-the-air (OTA) software and security updates to remotely update the devices, minimize the maintenance cost and improve the end-user product experience.
An archive of all release notes associated with the latest version of the GSDK can be found here.
Gecko SDK Release Notes (4.4.4.0)
Latest Release - Q3/2024 (August 2024)
Gecko Platform Version 4.4.4.0
- Peripherals
- New API names introduced for low-level drivers (with compatibility layer for old names)
- Services
- APIs for accessing value of tokens added to Token Manager
- CPC
- NVM3 module, enabling Host access to Secondary device's non-volatile memory, released at production quality
- CPC Primary, for use with MCU Hosts, released at Experimental quality
- Numerous optimizations and performance improvements made
- NVM3 module, enabling Host access to Secondary device's non-volatile memory, released at production quality
- Security
- Mbed TLS upgraded (to version 3.5.0)
- Mbed TLS upgraded (to version 3.5.0)
- RAIL
- Several new features added for EFR32xG25 devices, including a new component for selecting modulations supported by the software modem
- Support added for several new PHYs, including Sidewalk PHYs on EFR32xG23 and EFR32xG28
- Several new features added for EFR32xG25 devices, including a new component for selecting modulations supported by the software modem
- Other Components
- Compilers upgraded (to GCC 12.2.1 and IAR 9.40.1)
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/08 | Version 4.4.4.0  |
| 2024/07 | Version 4.2.6.0 |
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| 2024/05 | Version 4.4.3.0 |
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| 2024/04 | Version 4.4.2.0 |
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| 2024/03 | Version 4.3.3.0 |
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| 2024/02 | Version 4.4.1.0 |
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| 2024/01 | Version 4.2.5.0 |
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| 2023 | 2023/12 | Version 4.4.0.0 |
| 2023/10 | Version 4.3.2.0 |
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| 2023/08 | Version 4.2.4.0 |
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| 2023/07 | Version 4.3.1.0 |
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| 2023/06 | Version 4.1.5.0 |
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| 2023/06 | Version 4.3.0.0 |
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| 2023/05 | Version 4.2.3.0 |
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| 2023/03 | Version 4.2.2.0 |
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| 2023/02 | Version 4.2.1.0 |
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| 2023/01 | Version 4.1.4.0 |
32-bit MCU Version 6.6.4.0
- Added support for new OPNs
- Upgrade compilers to GCC 12.2.1 and IAR 9.40.1
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/08 | Version 6.6.4.0 |
| 2024/07 | Version 6.4.6.0 |
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| 2024/05 | Version 6.6.3.0 |
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| 2024/04 | Version 6.6.2.0 |
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| 2024/03 | Version 6.5.3.0 |
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| 2024/02 | Version 6.6.1.0 |
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| 2024/01 | Version 6.4.5.0 |
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| 2023 | 2023/12 | Version 6.6.0.0 |
| 2023/10 | Version 6.5.2.0 |
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| 2023/10 | Version 6.1.9.0 |
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| 2023/08 | Version 6.4.4.0 |
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| 2023/07 | Version 6.5.1.0 |
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| 2023/06 | Version 6.3.5.0 |
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| 2023/06 | Version 6.5.0.0 |
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| 2023/05 | Version 6.4.3.0 |
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| 2023/03 | Version 6.4.2.0 |
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| 2023/02 | Version 6.4.1.0 |
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| 2023/01 | Version 6.3.4.0 |
Bluetooth Version 8.2.0.0
- Bluetooth
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
- Multiprotocol
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 8.2.0.0 |
| 2024/08 | Version 7.1.2.0 |
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| 2024/07 | Version 5.1.4.1 |
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| 2024/06 | Version 8.0.0.0 |
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| 2024/05 | Version 7.1.1.0 |
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| 2024/04 | Version 7.1.0.0 |
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| 2024/03 | Version 6.3.0.0 |
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| 2024/02 | Version 7.0.1.0 |
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| 2024/01 | Version 5.1.4.0 |
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| 2023 | 2023/12 | Version 7.0.0.0 |
| 2023/10 | Version 6.2.0.0 |
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| 2023/08 | Version 5.1.3.0 |
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| 2023/07 | Version 6.1.0.0 |
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| 2023/06 | Version 4.2.3.0 |
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| 2023/06 | Version 6.0.0.0 |
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| 2023/05 | Version 5.1.2.0 |
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| 2023/03 | Version 5.1.1.0 |
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| 2023/02 | Version 5.1.0.0 |
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| 2023/01 | Version 4.2.2.0 |
Bluetooth Location Services Version 8.2.0.0
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 8.2.0.0 |
| 2024/08 | Version 7.1.2.0 |
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| 2024/07 | Version 5.1.4.1 |
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| 2024/06 | Version 8.0.0.0 |
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| 2024/05 | Version 7.1.1.0 |
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| 2024/04 | Version 7.1.0.0 |
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| 2024/03 | Version 6.3.0.0 |
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| 2024/02 | Version 7.0.1.0 |
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| 2024/01 | Version 5.1.4.0 |
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| 2023 | 2023/12 | Version 7.0.0.0 |
| 2023/10 | Version 6.2.0.0 |
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| 2023/08 | Version 5.1.3.0 |
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| 2023/07 | Version 6.1.0.0 |
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| 2023/06 | Version 4.2.3.0 |
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| 2023/06 | Version 6.0.0.0 |
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| 2023/05 | Version 5.1.2.0 |
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| 2023/02 | Version 5.1.1.0 |
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| 2023/01 | Version 4.2.2.0 |
Bluetooth Mesh Version 7.0.2.0
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 7.0.2.0 |
| 2024/08 | Version 6.1.2.0 |
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| 2024/07 | Version 4.2.4.0 |
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| 2024/06 | Version 7.0.0.0 |
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| 2024/05 | Version 6.1.1.0 |
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| 2024/04 | Version 6.1.0.0 |
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| 2024/03 | Version 5.0.3.0 |
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| 2024/02 | Version 6.0.1.0 |
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| 2024/01 | Version 4.2.3.0 |
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| 2023 | 2023/12 | Version 6.0.0.0 |
| 2023/10 | Version 5.0.2.0 |
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| 2023/08 | Version 4.2.2.0 |
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| 2023/07 | Version 5.0.1.0 |
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| 2023/06 | Version 3.0.5.0 |
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| 2023/06 | Version 5.0.0.0 |
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| 2023/05 | Version 4.2.1.0 |
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| 2023/03 | Version 4.2.0.0 |
Bluetooth Mesh ADK Version 7.0.2.0
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 7.0.2.0 |
| 2024/08 | Version 6.0.4.0 |
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| 2024/07 | Version 4.2.4.0 |
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| 2024/06 | Version 7.0.0.0 |
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| 2024/05 | Version 6.0.3.0 |
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| 2024/04 | Version 6.0.2.0 |
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| 2024/03 | Version 5.0.3.0 |
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| 2024/02 | Version 6.0.1.0 |
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| 2024/01 | Version 4.2.3.0 |
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| 2023 | 2023/12 | Version 6.0.0.0 |
| 2023/08 | Version 4.2.2.0 |
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| 2023/07 | Version 5.0.1.0 |
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| 2023/06 | Version 3.0.5.0 |
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| 2023/06 | Version 5.0.0.0 |
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| 2023/05 | Version 4.2.1.0 |
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| 2023/03 | Version 4.2.0.0 |
OpenThread Version 2.5.2.0
- OpenThread
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
- Multiprotocol
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 2.5.2.0 |
| 2024/08 | Version 2.4.4.0 |
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| 2024/07 | Version 2.2.6.0 |
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| 2024/06 | Version 2.5.0.0 |
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| 2024/05 | Version 2.4.3.0 |
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| 2024/04 | Version 2.4.2.0 |
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| 2024/03 | Version 2.3.3.0 |
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| 2024/02 | Version 2.4.1.0 |
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| 2024/01 | Version 2.2.5.0 |
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| 2023 | 2023/12 | Version 2.4.0.0 |
| 2023/10 | Version 2.3.2.0 |
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| 2023/08 | Version 2.2.4.0 |
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| 2023/07 | Version 2.3.1.0 |
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| 2023/06 | Version 2.1.5.0 |
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| 2023/06 | Version 2.3.0.0 |
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| 2023/05 | Version 2.2.3.0 |
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| 2023/03 | Version 2.2.2.0 |
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| 2023/02 | Version 2.2.1.0 |
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| 2023/01 | Version 2.1.4.0 |
Proprietary Flex Version 3.8.2.0
- RAIL Apps and Library:
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
- Connect Apps and Stack:
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 3.8.2.0 |
| 2024/08 | Version 3.7.4.0 |
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| 2024/07 | Version 3.5.6.0 |
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| 2024/06 | Version 3.8.0.0 |
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| 2024/05 | Version 3.7.3.0 |
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| 2024/04 | Version 3.7.2.0 |
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| 2024/03 | Version 3.6.3.0 |
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| 2024/02 | Version 3.7.1.0 |
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| 2024/01 | Version 3.5.5.0 |
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| 2023 | 2023/12 | Version 3.7.0.0 |
| 2023/10 | Version 3.6.2.0 |
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| 2023/08 | Version 3.5.4.0 |
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| 2023/07 | Version 3.6.1.0 |
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| 2023/06 | Version 3.4.5.0 |
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| 2023/06 | Version 3.6.0.0 |
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| 2023/05 | Version 3.5.3.0 |
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| 2023/03 | Version 3.5.2.0 |
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| 2023/02 | Version 3.5.1.0 |
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| 2023/01 | Version 3.4.4.0 |
USB Device Stack 1.3.0.0
- Underlying platform changes only
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/08 | Version 1.2.3.0 |
| 2024/06 | Version 1.3.0.0 |
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| 2024/05 | Version 1.2.2.0 |
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| 2024/04 | Version 1.2.1.0 |
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| 2023 | 2023/12 | Version 1.2.0.0 |
| 2023/06 | Version 1.1.2.0 |
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| 2023/02 | Version 1.1.1.0 |
Wi-SUN Version 2.2.0.0
- Wi-SUN Stack:
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
- Wi-SUN Applications:
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 2.2.0.0 |
| 2024/08 | Version 1.10.2.0 |
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| 2024/06 | Version 2.0.0.0 |
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| 2024/05 | Version 1.10.1.0 |
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| 2024/04 | Version 1.10.0.0 |
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| 2024/03 | Version 1.7.2.0 |
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| 2024/01 | Version 1.9.0.0 |
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| 2023 | 2023/12 | Version 1.8.0.0 |
| 2023/10 | Version 1.7.1.0 |
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| 2023/07 | Version 1.7.0.0 |
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| 2023/06 | Version 1.6.0.0 |
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| 2023/05 | Version 1.5.2.0 |
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| 2023/03 | Version 1.5.1.0 |
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| 2023/02 | Version 1.5.0.0 |
Zigbee EmberZNet Version 8.0.2.0
- Zigbee
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
- Multiprotocol
- Targeted quality improvements and bug fixes
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 8.0.2.0 |
| 2024/08 | Version 7.4.4.0 |
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| 2024/07 | Version 7.2.6.0 |
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| 2024/06 | Version 8.0.0.0 |
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| 2024/05 | Version 7.4.3.0 |
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| 2024/04 | Version 7.4.2.0 |
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| 2024/03 | Version 7.3.3.0 |
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| 2024/02 | Version 7.4.1.0 |
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| 2024/01 | Version 7.2.5.0 |
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| 2023 | 2023/12 | Version 7.4.0.0 |
| 2023/10 | Version 7.3.2.0 |
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| 2023/08 | Version 7.2.4.0 |
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| 2023/07 | Version 7.3.1.0 |
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| 2023/06 | Version 7.1.5.0 |
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| 2023/06 | Version 7.3.0.0 |
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| 2023/05 | Version 7.2.3.0 |
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| 2023/03 | Version 7.2.2.0 |
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| 2023/02 | Version 7.2.1.0 |
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| 2023/01 | Version 7.1.4.0 |
Z-Wave and Z-Wave Long Range 700/800 SDK 7.22.2.0
- Self-certified according to the approved 2024A Specification test suite
- User Credential Command Class implementation is adapted based on the state of the Z-Wave Specification at the time of the 7.22.2 GA release, which may change until the 2024-B1 Z-Wave Specification release
- 7.22.0 GA is officially certified according to the approved 2023B Specification test suite and can be selected on Z-Wave Alliance Certification Portal for End Device product certification
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/09 | Version 7.22.2.0 |
| 2024/08 | Version 7.21.4.0 |
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| 2024/06 | Version 7.22.0.0 |
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| 2024/05 | Version 7.21.3.0 |
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| 2024/04 | Version 7.21.2.0 |
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| 2024/03 | Version 7.20.3.0 |
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| 2024/02 | Version 7.21.1.0 |
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| 2024/01 | Version 7.19.5.0 |
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| 2023 | 2023/12 | Version 7.21.0.0 |
| 2023/10 | Version 7.20.2.0 |
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| 2023/08 | Version 7.19.4.0 |
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| 2023/07 | Version 7.20.1.0 |
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| 2023/06 | Version 7.18.6.0 < |
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| 2023/06 | Version 7.20.0.0 |
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| 2023/05 | Version 7.19.3.0 |
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| 2023/03 | Version 7.19.2.0 |
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| 2023/02 | Version 7.19.1.0 |
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| 2023/01 | Version 7.18.4.0 |
Wireless SDKs
The following components are available as part of Simplicity Studio.
Explore the portfolio of Wireless IoT protocol SDKs
32-bit Microcontroller SDK
This software package provides all of the drivers and services needed for a successful 32-bit MCU project.
Bluetooth Low Energy SDK
Develop Bluetooth Low Energy wireless connectivity solutions for IoT devices and applications.
Bluetooth Mesh SDK
Develop scalable Bluetooth mesh wireless connectivity solutions for IoT devices and applications.
Flex SDK - Connect Stack
Connect is the IEEE 802.15.4 wireless networking stack. It allows you to develop proprietary connectivity applications for low-power devices quickly.
Flex SDK - RAIL
RAIL, the Radio Abstraction Interface Layer, gives you all the latest RF technologies without sacrificing the investment you’ve made in your wireless protocol.
Thread SDK - OpenThread
Here are the Thread SDK and development tools for creating IP-based 802.15.4 wireless mesh solutions.
Wi-SUN SDK
Industry-leading software stack and development tools for Wi-SUN IoT devices and applications.
Zigbee SDK - EmberZNet
Get the complete Zigbee protocol stack and all elements required for developing reliable mesh networking applications.
Z-Wave SDK
Develop Z-Wave Plus compliant IoT products quickly and cost-effectively with a complete SDK.