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SDK Release Notes

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.

  1. Simplicity SDK
  2. Gecko SDK

Simplicity SDK Release Notes (2024.6.0)

Latest Release - Q2/2024  (June 2024)

Platform Version 5.0.0.0

  • Migration to Simplicity SDK Suite
  • Removed support for Series 0/1
  • 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
  • Security
    • Mbed TLS upgraded (to version 3.5.0)
  • RAIL 5.0.0
    • 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)
Software Development Kit Package Release Notes/Version
Platform Version 5.0.0.0 
Bluetooth Version 8.0.0.0 
Bluetooth Location Services Version 8.0.0.0 
Bluetooth Mesh Version 7.0.0.0 
Bluetooth Mesh ADK Version 7.0.0.0 
Flex Version 3.8.0.0 
OpenThread Version 2.5.0.0 
USB Device Stack Version 1.3.0.0 
Wi-SUN Version 2.0.0.0 
Z-Wave and Z-Wave Long Range 800 Version 7.22.0.0 
Zigbee EmberZNet Version 8.0.0.0 

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
  • Security
    • 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
  • Other Components
    • Compilers upgraded (to GCC 12.2.1 and IAR 9.40.1)
Release Date Release Notes
2024  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 2024/05 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
  • 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

 

Release Date Release Notes
 2024 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 2024/05 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 2024/05 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 2024/05 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
  • 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 
Release Date Release Notes
 2024 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 Apps and Stack:
    • SUN-FSK and SUN-OFDM support
    • Long message reception andtransmission
Release Date Release Notes
2024  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
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
  • 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
Release Date Release Notes
2024 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.

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