Our newest embedded software platform, the Simplicity Software Development Kit (SDK), is designed specifically for our Series 2 and upcoming Series 3 devices. The Simplicity SDK is a significant advancement in IoT development, providing our customers with a cohesive development environment for wireless innovation. It enables wireless developers to utilize advanced features and capabilities with the most recent Silicon Labs IoT devices.
Meanwhile, our Gecko Software Development Kit (GSDK) will continue to be available for users of our Series 0 and Series 1 devices.
The Gecko SDK will continue to support all Series 0 and 1 devices with no change to the long-term support, maintenance, quality, and responsiveness provided under our software policy.The new SDK will branch from Gecko SDK and begin to offer new features that help developers take advantage of the advanced capabilities of our Series 2 and 3 products.
This decision aligns with customer feedback, reflecting our commitment to elevate quality, ensure stability, and enhance performance for an exceptional user experience across our software SDKs.
Which SDK Do I Need?
Separate SDKs for Series 0 & 1 and Series 2 & 3 Starting in Q2 2024.
Have a question about which Series you're using. Learn more using our Series Directory.
-
Simplicity SDK
-
Gecko SDK
Simplicity SDK Release Notes (2024.6.1)
Latest Release - Q3/2024 (July 2024)
Platform Version 5.0.1.0
- Removed support for Series 0/1
- Support for EFR32xG26, EFR32xG22E and EFR32xG24 devices
- Peripherals
- New API names introduced for low-level drivers (with compatibility layer for old names)
- Services
- Memory Manager, APIs to manage embedded dynamic memory allocations
- Clock Manager, for clock tree initialization
- Event System, for inter-process communication
- Interrupt manager, APIs to manage embedded interrupts
- APIs for accessing value of tokens added to Token Manager
- CPC
- Small improvement and bug fixes
- RAIL
- Added support for collision detection feature on the EFR32xG25 parts
- Added support for additional Coex TX and RX metrics events to RAIL coexistence utility
- Updated some RAIL APIs to better prepare for future API changes while retaining backwards compile-time compatibility
- Other Components
- Compilers upgraded (to GCC 12.2.1 and IAR 9.40.1)
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 5.0.1.0  |
| 2024/06 | Version 5.0.0.0 |
Bluetooth LE Version 8.1.0.0
- Bluetooth
- Auto-connect feature to enable connecting to any device on the accept list
- Common Memory and Clock Manager integration
- Electronic Shelf Label (ESL) related improvements
- Removed support for Series 0/1
- Multiprotocol
- Alpha support for OpenWRT on host processor of multiprotocol RCP solution
- Alpha support for Concurrent Zigbee and Matter over OpenThread, with DMP BLE
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 8.1.0.0 |
| 2024/06 | Version 8.0.0.0 |
Bluetooth Location Services Version 8.1.0.0
- Channel Sounding based distance estimation support
- Removed support for Series 0/1
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 8.1.0.0 |
| 2024/06 | Version 8.0.0.0 |
Bluetooth Mesh Version 7.0.1.0
- Migration to Simplicity SDK Suite
- Removed support for Series 0/1
- Support for delta-compressed firmware updates
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 7.0.1.0 |
| 2024/06 | Version 7.0.0.0 |
Bluetooth Mesh ADK Version 7.0.1.0
- Export and Import API are added in ADK for mesh configuration database
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 7.0.1.0 |
| 2024/06 | Version 7.0.0.0 |
OpenThread Version 2.5.1.0
- OpenThread
- Thread 1.3.0 certification compliance with Thread Test Harness v59.0 for SoC and Host-RCP architectures
- Thread 1.4 features - Alpha / Experimental
- Coex Metrics enhancements
- OpenThread Mesh Performance Results (AN1408)
- New Part support:
- MG26 support – Alpha
- Removed support for Series 0/1
- Multiprotocol
- ZigbeeD and OTBR support on OpenWRT – Alpha
- DMP BLE + CMP ZB & Matter/OT – Alpha
- Removed support for Series 0/1
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 2.5.1.0 |
| 2024/06 | Version 2.5.0.0 |
Proprietary Flex Version 3.8.1.0
- Rail Apps and Library
- Flex-RAIL SDK support for EFR32xG22E Devices
- LCD Display usage in WM-BUS Meter Sample Application on DK2600
- Collision Detection support in RAIL Library in concurrent mode on FG25
- Added support for additional Coex TX and RX metrics events to RAIL coexistence utility
- Updated some RAIL APIs to better prepare for future API changes while retaining backwards compile-time compatibility
- Connect Apps and Stack
- Flex-Connect SDK support for EFR32xG22E Devices
- Removed support for Series 0/1
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 3.8.1.0 |
| 2024/06 | Version 3.8.0.0 |
USB Device Version 1.3.1.0
- Underlying platform changes only
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 1.3.1.0 |
| 2024/06 | Version 1.3.0.0 |
Wi-SUN Version 2.1.0.0
- Wi-SUN Stack
- Dropped the legacy socket API
- Stability improvements
- Removed support for Series 0/1
- Wi-SUN Applications
- Underlying platform changes only
- Underlying platform changes only
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 2.1.0.0 |
| 2024/06 | Version 2.0.0.0 |
Zigbee EmberZNet Version 8.0.1.0
- Zigbee
- Zigbee re-architecture to support stack and framework to be fully RTOS based
- Memory management update
- New clock manager component integrated in Zigbee applications
- Removed support for Series 0/1
- Added support for series 3 – Alpha
- Added support for new platform xG26, xG22E
- Zigbee GP 1.1.2
- Support Sleepy NCP use case
- New application for Zigbee Unified Test Harness - Alpha
- Multiprotocol
- Alpha support for OpenWRT on host processor of multiprotocol RCP solution
- Alpha support for Concurrent Zigbee and Matter over OpenThread, with DMP BLE
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 8.0.1.0 |
| 2024/06 | Version 8.0.0.0 |
Z-Wave and Z-Wave Long Range 800 Version 7.22.1
- 7.22.x and future updates support the 800 Series platform
- 700 Series platform will continue to be supported through the upcoming 7.21.x releases
- Adding additional information on the reset reason in the FUNC_ID_SERIAL_API_STARTED payload
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 7.22.1.0 |
| 2024/06 | Version 7.22.0.0 |
Gecko SDK Release Notes (4.4.3.0)
Latest Release - Q2/2024 (May 2024)
Gecko Platform Version 4.4.3.0
- 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 5.0.0
- 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 | 2024/07 | Version 4.2.6.0 |
| 2024/05 | Version 4.4.3.0 |
|
| 2024/04 | Version 4.4.2.0 |
|
| 2024/03 | Version 4.3.3.0 |
|
| 2024/02 | Version 4.4.1.0 |
|
| 2024/01 | Version 4.2.5.0 |
|
| 2023 | 2023/12 | Version 4.4.0.0 |
| 2023/10 | Version 4.3.2.0 |
|
| 2023/08 | Version 4.2.4.0 |
|
| 2023/07 | Version 4.3.1.0 |
|
| 2023/06 | Version 4.1.5.0 |
|
| 2023/06 | Version 4.3.0.0 |
|
| 2023/05 | Version 4.2.3.0 |
|
| 2023/03 | Version 4.2.2.0 |
|
| 2023/02 | Version 4.2.1.0 |
|
| 2023/01 | Version 4.1.4.0 |
32-bit MCU Version 6.6.3.0
- Added support for new OPNs
- Upgrade compilers to GCC 12.2.1 and IAR 9.40.1
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 6.4.6.0 |
| 2024/05 | Version 6.6.3.0 |
|
| 2024/04 | Version 6.6.2.0 |
|
| 2024/03 | Version 6.5.3.0 |
|
| 2024/02 | Version 6.6.1.0 |
|
| 2024/01 | Version 6.4.5.0 |
|
| 2023 | 2023/12 | Version 6.6.0.0 |
| 2023/10 | Version 6.5.2.0 |
|
| 2023/10 | Version 6.1.9.0 |
|
| 2023/08 | Version 6.4.4.0 |
|
| 2023/07 | Version 6.5.1.0 |
|
| 2023/06 | Version 6.3.5.0 |
|
| 2023/06 | Version 6.5.0.0 |
|
| 2023/05 | Version 6.4.3.0 |
|
| 2023/03 | Version 6.4.2.0 |
|
| 2023/02 | Version 6.4.1.0 |
|
| 2023/01 | Version 6.3.4.0 |
Bluetooth Version 7.1.1.0
- Bluetooth
- New feature component bluetooth_feature_connection_analyzer provides thefunctionality to capture and analyze theRSSI of transmissions on a Bluetoothconnection
- New feature component bluetooth_feature_connection_analyzer provides thefunctionality to capture and analyze theRSSI of transmissions on a Bluetoothconnection
- Multiprotocol
- Concurrent Listening support (RCP) – MG21 and MG24
- Concurrent Multiprotocol (CMP) Zigbee NCP + OpenThread RCP – production quality
- Dynamic Multiprotocol Bluetooth + Concurrent Multiprotocol (CMP) Zigbee and OpenThread support on SoC
- Concurrent Listening support (RCP) – MG21 and MG24
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 5.1.4.1 |
| 2024/05 | Version 7.1.1.0 |
|
| 2024/04 | Version 7.1.0.0 |
|
| 2024/03 | Version 6.3.0.0 |
|
| 2024/02 | Version 7.0.1.0 |
|
| 2024/01 | Version 5.1.4.0 |
|
| 2023 | 2023/12 | Version 7.0.0.0 |
| 2023/10 | Version 6.2.0.0 |
|
| 2023/08 | Version 5.1.3.0 |
|
| 2023/07 | Version 6.1.0.0 |
|
| 2023/06 | Version 4.2.3.0 |
|
| 2023/06 | Version 6.0.0.0 |
|
| 2023/05 | Version 5.1.2.0 |
|
| 2023/03 | Version 5.1.1.0 |
|
| 2023/02 | Version 5.1.0.0 |
|
| 2023/01 | Version 4.2.2.0 |
Bluetooth Location Services Version 7.1.1.0
- Underlying code changes only
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 5.1.4.1 |
| 2024/05 | Version 7.1.1.0 |
|
| 2024/04 | Version 7.1.0.0 |
|
| 2024/03 | Version 6.3.0.0 |
|
| 2024/02 | Version 7.0.1.0 |
|
| 2024/01 | Version 5.1.4.0 |
|
| 2023 | 2023/12 | Version 7.0.0.0 |
| 2023/10 | Version 6.2.0.0 |
|
| 2023/08 | Version 5.1.3.0 |
|
| 2023/07 | Version 6.1.0.0 |
|
| 2023/06 | Version 4.2.3.0 |
|
| 2023/06 | Version 6.0.0.0 |
|
| 2023/05 | Version 5.1.2.0 |
|
| 2023/02 | Version 5.1.1.0 |
|
| 2023/01 | Version 4.2.2.0 |
Bluetooth Mesh Version 6.1.1.0
- Qualified implementation of Bluetooth Mesh 1.1
- Added Network Lighting Control (NLC) profiles
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 4.2.4.0 |
| 2024/05 | Version 6.1.1.0 |
|
| 2024/04 | Version 6.1.0.0 |
|
| 2024/03 | Version 5.0.3.0 |
|
| 2024/02 | Version 6.0.1.0 |
|
| 2024/01 | Version 4.2.3.0 |
|
| 2023 | 2023/12 | Version 6.0.0.0 |
| 2023/10 | Version 5.0.2.0 |
|
| 2023/08 | Version 4.2.2.0 |
|
| 2023/07 | Version 5.0.1.0 |
|
| 2023/06 | Version 3.0.5.0 |
|
| 2023/06 | Version 5.0.0.0 |
|
| 2023/05 | Version 4.2.1.0 |
|
| 2023/03 | Version 4.2.0.0 |
Bluetooth Mesh ADK Version 6.0.3.0
- Added support for Networked Lighting Control (NLC) profiles. Mobile Application can detect the presence of a NLC based device and automatically provision and configure it.
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 4.2.4.0 |
| 2024/05 | Version 6.0.3.0 |
|
| 2024/04 | Version 6.0.2.0 |
|
| 2024/03 | Version 5.0.3.0 |
|
| 2024/02 | Version 6.0.1.0 |
|
| 2024/01 | Version 4.2.3.0 |
|
| 2023 | 2023/12 | Version 6.0.0.0 |
| 2023/08 | Version 4.2.2.0 |
|
| 2023/07 | Version 5.0.1.0 |
|
| 2023/06 | Version 3.0.5.0 |
|
| 2023/06 | Version 5.0.0.0 |
|
| 2023/05 | Version 4.2.1.0 |
|
| 2023/03 | Version 4.2.0.0 |
OpenThread Version 2.4.3.0
- OpenThread
- Thread 1.3.0 certification compliance withThread Test Harness v59.0 for SoC andHost-RCP architectures
- Thread 1.3.1 feature support - Experimental
- Crash Handler support
- TrustZone Evaluation support
- MR21 support for OpenThread RCP – Production
- Thread 1.3.0 certification compliance withThread Test Harness v59.0 for SoC andHost-RCP architectures
- Multiprotocol
- Concurrent Listening support (RCP) –MG21 and MG24
- Concurrent Multiprotocol (CMP) ZigbeeNCP + OpenThread RCP – production quality
- Dynamic Multiprotocol Bluetooth + Concurrent Multiprotocol (CMP) Zigbee andOpenThread support on SoC
- Concurrent Listening support (RCP) –MG21 and MG24
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 2.2.6.0 |
| 2024/05 | Version 2.4.3.0 |
|
| 2024/04 | Version 2.4.2.0 |
|
| 2024/03 | Version 2.3.3.0 |
|
| 2024/02 | Version 2.4.1.0 |
|
| 2024/01 | Version 2.2.5.0 |
|
| 2023 | 2023/12 | Version 2.4.0.0 |
| 2023/10 | Version 2.3.2.0 |
|
| 2023/08 | Version 2.2.4.0 |
|
| 2023/07 | Version 2.3.1.0 |
|
| 2023/06 | Version 2.1.5.0 |
|
| 2023/06 | Version 2.3.0.0 |
|
| 2023/05 | Version 2.2.3.0 |
|
| 2023/03 | Version 2.2.2.0 |
|
| 2023/02 | Version 2.2.1.0 |
|
| 2023/01 | Version 2.1.4.0 |
Proprietary Flex Version 3.7.3.0
- RAIL Apps and Library:
- Connect OFDM support for some applications
- EFR32xG28 Proprietary 2.4 GHz 15.4Standard PHY support
- Added hardware support: MG24 QFN40, EFRBG22-E, EFR32xG28 Explorer Kit
- Connect OFDM support for some applications
- Connect Apps and Stack:
- SUN-FSK and SUN-OFDM support
- Long message reception andtransmission
- SUN-FSK and SUN-OFDM support
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 3.5.6.0 |
| 2024/05 | Version 3.7.3.0 |
|
| 2024/04 | Version 3.7.2.0 |
|
| 2024/03 | Version 3.6.3.0 |
|
| 2024/02 | Version 3.7.1.0 |
|
| 2024/01 | Version 3.5.5.0 |
|
| 2023 | 2023/12 | Version 3.7.0.0 |
| 2023/10 | Version 3.6.2.0 |
|
| 2023/08 | Version 3.5.4.0 |
|
| 2023/07 | Version 3.6.1.0 |
|
| 2023/06 | Version 3.4.5.0 |
|
| 2023/06 | Version 3.6.0.0 |
|
| 2023/05 | Version 3.5.3.0 |
|
| 2023/03 | Version 3.5.2.0 |
|
| 2023/02 | Version 3.5.1.0 |
|
| 2023/01 | Version 3.4.4.0 |
USB Device Stack 1.2.2.0
- Targeted quality improvements and bug fixes
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/05 | Version 1.2.2.0 |
| 2024/04 | Version 1.2.1.0 |
|
| 2023 | 2023/12 | Version 1.2.0.0 |
| 2023/06 | Version 1.1.2.0 |
|
| 2023/02 | Version 1.1.1.0 |
Wi-SUN Version 1.10.1.0
- Wi-SUN Stack:
- Added support for LFN multicast reception
- Added support for non-standard PHY configurations
- Added support for blocking sockets
- Wi-SUN Applications:
- Wi-SUN – SoC Network Measurement improvements
- Wi-SUN – SoC (CoAP) Meter and Wi-SUN –SoC (CoAP) Collector improvements
- Wi-SUN – SoC Network Measurement improvements
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/05 | Version 1.10.1.0 |
| 2024/04 | Version 1.10.0.0 |
|
| 2024/03 | Version 1.7.2.0 |
|
| 2024/01 | Version 1.9.0.0 |
|
| 2023 | 2023/12 | Version 1.8.0.0 |
| 2023/10 | Version 1.7.1.0 |
|
| 2023/07 | Version 1.7.0.0 |
|
| 2023/06 | Version 1.6.0.0 |
|
| 2023/05 | Version 1.5.2.0 |
|
| 2023/03 | Version 1.5.1.0 |
|
| 2023/02 | Version 1.5.0.0 |
Zigbee EmberZNet Version 7.4.3.0
- Zigbee
- Zigbee R23 compliance
- Zigbee Smart Energy 1.4a compliance - production
- Zigbee GP 1.1.2 compliance - Alpha
- MG27 support - production
- Improved support for Secure Vault parts
- Sleepy support on NCP SPI (non-CPC) applications – Alpha
- Zigbee R23 compliance
- Multiprotocol
- Concurrent Listening support (RCP) – MG21 and MG24
- Concurrent Multiprotocol (CMP) Zigbee NCP+ OpenThread RCP – production
- Dynamic Multiprotocol Bluetooth + ConcurrentMultiprotocol (CMP) Zigbee and OpenThread support on SoC
- Concurrent Listening support (RCP) – MG21 and MG24
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/07 | Version 7.2.6.0 |
| 2024/05 | Version 7.4.3.0 |
|
| 2024/04 | Version 7.4.2.0 |
|
| 2024/03 | Version 7.3.3.0 |
|
| 2024/02 | Version 7.4.1.0 |
|
| 2024/01 | Version 7.2.5.0 |
|
| 2023 | 2023/12 | Version 7.4.0.0 |
| 2023/10 | Version 7.3.2.0 |
|
| 2023/08 | Version 7.2.4.0 |
|
| 2023/07 | Version 7.3.1.0 |
|
| 2023/06 | Version 7.1.5.0 |
|
| 2023/06 | Version 7.3.0.0 |
|
| 2023/05 | Version 7.2.3.0 |
|
| 2023/03 | Version 7.2.2.0 |
|
| 2023/02 | Version 7.2.1.0 |
|
| 2023/01 | Version 7.1.4.0 |
Z-Wave and Z-Wave Long Range 700/800 SDK 7.21.3.0
- Various quality improvements
- Improve the power manager interfacewith the Z-Wave application layer
| Release | Date | Release Notes |
|---|---|---|
| 2024 | 2024/05 | Version 7.21.3.0 |
| 2024/04 | Version 7.21.2.0 |
|
| 2024/03 | Version 7.20.3.0 |
|
| 2024/02 | Version 7.21.1.0 |
|
| 2024/01 | Version 7.19.5.0 |
|
| 2023 | 2023/12 | Version 7.21.0.0 |
| 2023/10 | Version 7.20.2.0 |
|
| 2023/08 | Version 7.19.4.0 |
|
| 2023/07 | Version 7.20.1.0 |
|
| 2023/06 | Version 7.18.6.0 < |
|
| 2023/06 | Version 7.20.0.0 |
|
| 2023/05 | Version 7.19.3.0 |
|
| 2023/03 | Version 7.19.2.0 |
|
| 2023/02 | Version 7.19.1.0 |
|
| 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.