Multi-Protocol SDK Version 2.12.1 (September 10, 2025) - Release Notes#

Wi-Fi 4 RS9116x Series

The Multiprotocol software development kit (SDK) provides Wi-Fi and BLE co-existence and packet traffic arbitration (PTA) features.

Click here for earlier releases.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

None

API Changes#

None

Bug Fixes#

  • Fixed firmware hang issue while trying to perform BT SPP disconnection during simultaneous WLAN scan and BTC SPP data transfer.

Chip Enablement#

None

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

Note: See Feature Matrix for a list of any applicable APIs, examples, software variants, modes, hardware, and host interfaces for each feature.

New Features#

None

Enhancements#

None

Removed Features#

None

Deprecated Features#

None

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None

Modified APIs#

None

Removed APIs#

None

Deprecated APIs#

None

Bug Fixes#

ID Issue Description GitHub / Salesforce Reference (if any) Affected Chip Revision, Hardware, Host Interfaces
1465515 Resolved a firmware hang issue that occurred during Bluetooth SPP disconnection while a WLAN scan and BTC SPP data transfer were running simultaneously. None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI

Chip Enablement#

None

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

New Examples#

None

Modified Examples#

None

Removed Examples#

None

Deprecated Examples#

None

Known Issues and Limitations#

ID Issue or Limitation Description GitHub / Salesforce Reference (if any) Workaround (if any) Affected Chip Revision, Hardware, Host Interfaces
NA In Wi-Fi + BLE mode, BLE may disconnect if the supervision timeout is set below 16 seconds. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA WPS does not work. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi + BLE or BLE-only modes, BT/BLE reconnection issues may occur when Wi-Fi disconnects. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1215476 In Wi-Fi + BT mode, Wi-Fi throughput logs are not displayed in serial terminals (for example, TeraTerm) when BT SPP is connected using the wlan_bt_throughput_app demo. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi + BT/BLE CoEx mode, high Wi-Fi broadcast traffic may cause BT/BLE disconnections. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi + BT mode, continuous Wi-Fi data may prevent BT from reconnecting after disconnection. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi + BLE mode, Wi-Fi connection attempts may be unsuccessful when the BLE scan interval and scan window parameters are equal. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi + AE Coexistence:
  • Enable power save to test the Wi-Fi + AE coexistence use cases.
  • Maximum supported BLE scan interval and window for 100% duty cycling is 3 seconds.
  • Remove bond information on remote device for every connection if SMP is enabled.
  • Maximum of 2 extended Advertising sets are supported.
  • Maximum of 2 BLE connections ( 1 central + 1 peripheral) are supported.
    		•  None None
    • Hardware boards: All
    • Chip revision: All
    • Host interface: UART, SPI
    NA Wi-Fi STA + BT + BLE multiprotocol use cases requires a detailed understanding of use cases and associated configurations. Contact Silicon Labs support for additional details. None None
    • Hardware boards: All
    • Chip revision: All
    • Host interface: UART, SPI