Bluetooth LE SDK Controller Version 11.1.0 - Release Notes (Jun 23, 2026)#

Bluetooth LE Version 11.1.0

The Bluetooth 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, and NCP mode, allowing for the use of an external host MCU.

Click here for earlier releases.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

• Added support for Advertising Data Info (ADI) in Periodic Advertising and Periodic Advertising with Responses.

• Added Channel Map Update Indication support for the Periodic Advertising advertiser, enabling Adaptive Frequency Hopping with Periodic Advertising in congested RF environments.

• Improved Bluetooth LE power efficiency for advertising and peripheral connection use cases.

• Extended the Bluetooth LE CTE antenna switching pattern from 50 to 66 antenna IDs.

• Moved the selection of active or passive Adaptive Frequency Hopping (AFH) from the Bluetooth Low Energy Controller component to the AFH component.

API Changes#

• Added the SL_BLUETOOTH_COMMON_BUFFER_MEMORY_SIZE configuration to the Bluetooth Low Energy Common component.

• Added SL_BT_CONTROLLER_RF_RX_PATH_GAIN_DECI_DB and SL_BT_CONTROLLER_RF_TX_PATH_GAIN_DECI_DB configurations to the Bluetooth Low Energy Common component.

• Removed SL_BT_HOST_ADAPTATION_RADIO_IRQ_PRIORITY and SL_BT_HOST_ADAPTATION_LINKLAYER_IRQ_PRIORITY. Use SL_BT_CONTROLLER_RADIO_IRQ_PRIORITY and SL_BT_CONTROLLER_LINKLAYER_IRQ_PRIORITY in the Bluetooth Low Energy Controller component instead.

• Deprecated SL_BT_CONFIG_BUFFER_SIZE, SL_BT_CONFIG_RF_PATH_GAIN_RX, and SL_BT_CONFIG_RF_PATH_GAIN_TX in the Bluetooth Core component, and SL_BT_CONTROLLER_BUFFER_MEMORY in the Bluetooth Low Energy Controller component.

Bug Fixes#

• Fixed a Co-Processor Communication (CPC) issue where host reconnection to the BLE endpoint could fail after a client disconnect on multiprotocol applications.

• Fixed BLE Extended Advertising TX power handling. The controller now correctly interprets the Host Controller Interface (HCI) "no preference" TX power setting.

• Fixed an issue where the scanner could exceed the configured scan window while following extended advertisements, causing higher power consumption.

• Fixed an issue where the Bluetooth LE controller did not report support for LE Periodic Advertising in the link layer features.

• Connection Analyzer reliability improved: Received Signal Strength Indicator (RSSI) is now reported for every connection event, including cases where the peripheral does not respond.

• Corrected the RAIL window scheduler priority configuration naming, with no change to default behavior.

Chip Enablement#

None.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

• Added support for ADI in Periodic Advertising and Periodic Advertising with Responses, improving interoperability with devices expecting this capability.

• Added Channel Map Update Indication support for the Periodic Advertising advertiser, enabling Adaptive Frequency Hopping with Periodic Advertising for improved reliability in congested or noisy RF environments.

Enhancements#

• Improved Bluetooth LE power efficiency by optimizing Link Layer event handling for advertising and peripheral connection scenarios.

• Extended the Bluetooth LE CTE antenna switching pattern length from 50 to 66 antenna IDs, enabling longer AoA/AoD antenna patterns.

• Moved the selection of active or passive AFH from the Bluetooth Low Energy Controller component to the AFH component. Documentation was updated to clarify usage and selection.

Removed Features#

• Removed the SL_BT_HOST_ADAPTATION_RADIO_IRQ_PRIORITY and SL_BT_HOST_ADAPTATION_LINKLAYER_IRQ_PRIORITY configurations. Use SL_BT_CONTROLLER_RADIO_IRQ_PRIORITY and SL_BT_CONTROLLER_LINKLAYER_IRQ_PRIORITY in the Bluetooth Low Energy Controller component instead.

Deprecated Features#

• Deprecated the SL_BT_CONFIG_BUFFER_SIZE, SL_BT_CONFIG_RF_PATH_GAIN_RX, and SL_BT_CONFIG_RF_PATH_GAIN_TX configurations in the Bluetooth Core component, and the SL_BT_CONTROLLER_BUFFER_MEMORY configuration in the Bluetooth Low Energy Controller component. Replacement configurations are provided in the Bluetooth Low Energy Common component. Existing projects remain compatible in this release; migration is recommended ahead of removal planned for a future release.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

• Added the SL_BLUETOOTH_COMMON_BUFFER_MEMORY_SIZE configuration to the Bluetooth Low Energy Common component, enabling tuning of the Bluetooth LE Common buffer memory size. Defaults preserve previous behavior.

• Added the SL_BT_CONTROLLER_RF_RX_PATH_GAIN_DECI_DB and SL_BT_CONTROLLER_RF_TX_PATH_GAIN_DECI_DB configurations to the Bluetooth Low Energy Common component.

Modified APIs#

None.

Removed APIs#

• Removed SL_BT_HOST_ADAPTATION_RADIO_IRQ_PRIORITY and SL_BT_HOST_ADAPTATION_LINKLAYER_IRQ_PRIORITY. Use SL_BT_CONTROLLER_RADIO_IRQ_PRIORITY and SL_BT_CONTROLLER_LINKLAYER_IRQ_PRIORITY from the Bluetooth Low Energy Controller component.

Deprecated APIs#

• Deprecated SL_BT_CONFIG_BUFFER_SIZE, SL_BT_CONFIG_RF_PATH_GAIN_RX, and SL_BT_CONFIG_RF_PATH_GAIN_TX in the Bluetooth Core component.

• Deprecated SL_BT_CONTROLLER_BUFFER_MEMORY in the Bluetooth Low Energy Controller component.

Bug Fixes#

Known Issues and Limitations#