Bluetooth LE SDK Example and Middleware Version 11.1.2 - Release Notes (Oct 14, 2026)#

Bluetooth LE Version 11.1.2

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, or, in NCP mode, allowing for the use of an external host MCU.

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Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

Added in 11.1.2#

• Channel Sounding: Added support for flexible mapping of GPIOs.

Added in 11.1.1#

• Middleware: Added Serial Port Profile (SPP).

• Middleware: Expanded Bluetooth peer manager and peer security.

• Middleware: Enhanced Channel Sounding.

• Middleware: Various Electronic Shelf Label bug fixes and stability improvements.

Added in 11.1.0#

None.

API Changes#

None.

Bug Fixes#

Added in 11.1.2#

• Fixed ncp_transport_iostream component blocking EM2 sleep.

• Fixed NCP host build error on macOS.

Added in 11.1.1#

None.

Added in 11.1.0#

None.

Chip Enablement#

Added in 11.1.2#

• Added support for BRD2610A (BGM241S Channel Sounding Dev Kit Board) - BGM241SD22VNA.

Added in 11.1.1#

None.

Added in 11.1.0#

None.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

Added in 11.1.2#

• Channel Sounding: Added support for flexible mapping of GPIOs to external antenna switching control and power enable pins.

Added in 11.1.1#

• Added Serial Port Profile middleware through the new spp component and related configuration and GATT service content.

• Added new Bluetooth peer manager and peer security middleware components for central, peripheral, filter, common, and security flows.

Added in 11.1.0#

None.

Enhancements#

• Optimised Channel Sounding PBR 1-N latency.

• Implemented various Electronic Shelf Label bug fixes and stability improvements.

• Channel Sounding: Added support for max_procedure_count=1 to Real Time Fast mode.

• Electronic Shelf Label Access Point:

  • ESL AP NCP: replaced default uart transport to iostream transport. bluetooth_ncp_transport_uart is no longer the default in ESL AP NCP, bluetooth_ncp_transport_iostream is used instead.

  • ESL AP: Modularize ap_core.py for improved maintanibility. The AccessPoint class in ESL AP/ap_core.py has been modularized using mixin classes for improved maintainability and future extensibility.

  • ESL AP: refactored event dispatching. The ESL AP event dispatcher has been refactored to an observer‑based, more flexible subscriber model, enabling easier integration of custom event handlers.

  • ESL AP: Optimize AP system bottlenecks. Improved AP scalability by removing per‑tag threading timers, optimizing tag object memory usage, and replacing linear registry lookups with indexed data structures.

Removed Features#

None.

Deprecated Features#

• Deprecated bluetooth_ncp_transport_usart and replaced by bluetooth_ncp_transport_iostream where it was applicable.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None.

Modified APIs#

None.

Removed APIs#

None.

Deprecated APIs#

None.

Bug Fixes#

Added in 11.1.2#

• Fixed the Bluetooth NCP transport over IOStream keeping the device awake and preventing EM2 sleep. The RX step function re-armed itself unconditionally and the runtime guard was not released on every path, so the transport always reported pending work to the power manager. RX now relies on the UART new data notification and only polls streams that cannot provide one. TX transfer handling was reworked as well, so the write completion callback no longer releases the guard or notifies the upper layer from interrupt context.

• Fixed NCP host build error on macOS. Added platform-specific time includes in ncp_host.c.

Added in 11.1.1#

• Fixed the uart_posix implementation that used wrong handle after select() call. Migrated the host UART interface (uart_posix.c) from select() to poll().

Added in 11.1.0#

None.

Chip Enablement#

Added in 11.1.2#

• Added support for BRD2610A (BGM241S Channel Sounding Dev Kit Board) - BGM241SD22VNA.

Added in 11.1.1#

None.

Added in 11.1.0#

None.

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

New Examples#

• Added bt_soc_spp example projects for bare-metal, FreeRTOS, and Micrium OS.

• Added bt_ncp_throughput example projects for bare-metal, FreeRTOS, and Micrium OS.

• Added bt_soc_esl_tag_demo project as a dedicated ESL tag demo configuration.

Modified Examples#

• Updated Channel Sounding examples: bt_cs_ncp, bt_cs_soc_initiator, and bt_cs_soc_reflector.

• Updated Channel Sounding example: bt_cs_soc_initiator. Changed default preferred_peer_antenna to 3 (was 1).

• Updated NCP examples including bt_ncp, bt_ncp_dfu, bt_ncp_host, and ESL AP variants.

• Updated radio and controller-facing examples including bt_rcp, bt_soc_dtm, and bt_rail_dmp_soc_*.

• Updated Bluetooth SoC examples including bt_soc_app_ota_dfu, bt_soc_blinky, bt_soc_empty, bt_soc_cbap, bt_soc_csr_generator, and bt_soc_esl_tag.

• Updated direction-finding examples including bt_aoa_ncp_locator, bt_aoa_soc_asset_tag, and bt_aod_ncp_receiver.

• Updated bt_soc_throughput example: increased default ATT MTU size. Utilize larger MTU and reconfigure default settings.

• Updated bt_soc_iop_test example to make its logging more verbose.

• Updated bt_cs_soc_initiator and bt_cs_soc_reflector and bt_cs_host examples to improve bonding security and fix reconnection behavior.

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#