Bluetooth LE Version 11.1.1 - Release Notes (Jul 29, 2026)#
Silicon Labs is a leading vendor in Bluetooth hardware and software technologies, used in products such as sports and fitness, consumer electronics, beacons, and smart home applications. The core SDK is an advanced Bluetooth 6.1-compliant stack that provides all of the core functionality along with multiple API to simplify development. The core functionality offers both standalone mode, allowing a developer to create and run their application directly on the SoC, or NCP mode, allowing for the use of an external host MCU.
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Release Summary#
| Release Item | Version | Release Date | Release Notes | Key Features | API Changes | Bug Fixes | Chip Enablement |
|---|---|---|---|---|---|---|---|
| Example and Middleware | 11.1.1 | Jul 29, 2026 | Release Notes |
|
None | Fixed the host UART interface to avoid wrong-handle use after select() by migrating to poll(). |
None |
| Host Stack | 11.1.1 | Jul 29, 2026 | Release Notes | None | None | None | None |
| Controller | 11.1.1 | Jul 29, 2026 | Release Notes | None | None | Improved Connection Analyzer RSSI reporting and fixed controller TX power, Channel Sounding, and PAwR synchronization issues. | None |
| 802.15.4 Mesh + BLE Multiprotocol | 11.1.1 | Jul 29, 2026 | None |
None |
Targeted quality improvements and bug fixes. |
None |
Impact of Release Changes#
Impact Statements | Migration Guide
Impact Statements#
None.
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 | 2025.12.3 |
| Simplicity Studio | Any version that is compatible to Simplicity SDK 2025.12 |
| Simplicity Commander | 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#
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To learn more about the software in this release, dive into our online documentation.
Help and Feedback#
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SDK Release and Maintenance Policy#
See our SDK Release and Maintenance Policy.