Wi-Fi SDK Version 2.12.1 (August 29 2025) - Release Notes#

Wi-Fi 4 RS9116x Series

The Wi-Fi software development kit (SDK) provides Wi-Fi 4 connectivity in various operating modes, including Station and Software Access Point (SoftAP).

Click here for earlier releases.

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

None

API Changes#

  • Wireless Query APIs modified to support fetching more details.

Bug Fixes#

  • Disabled the wireless activity enable/disable feature based on supply voltage.

  • Added documentation note about region-specific behavior of the RS9116 module while functioning in AP (Access Point) mode.

  • Updated the wakeup threshold to ensure RS9116 reliably wakes up to receive beacons.

  • Updated documentation to clarify that the 802.11r fast roaming feature is not supported.

  • Enhanced macro documentation in the SAPI Programming Reference Manual (PRM).

  • Updated the Aggregation feature description in the opermode.

  • Modified the Load certification section of the EAP example readme file.

  • Added the Note point to update the Pathlen bit in the EAP testing when using the existing Silabs wifi-user.pem file.

  • Updated the description of the pathlen field in opermode command.

  • Listed down all the available setsockopt in the PRM.

Chip Enablement#

None

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

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

New Features#

None

Enhancements#

  • Enhanced the rsi_wlan_get API to retrieve the BSSID data of connected Access Point.

Removed Features#

None

Deprecated Features#

None

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

None

Modified APIs#

Old API

Modified

rsi_wlan_get

Only the output of rsi_wlan_get API has been enhanced to return the BSSID information of connected Access Point along with the other parameters.

Removed APIs#

None

Deprecated APIs#

None

Bug Fixes#

ID Issue Description GitHub / Salesforce Reference (if any) Affected Chip Revision, Hardware, Host Interfaces
1476699 Wireless Initialization fails with IO_VDD 1.8V and FW 2.12.0.0.3 - 916 ACx None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1468498 [9116][ACX]AP_MODE cases fail with FF82 when enable REGION support bit None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1440461 Silabs issue: Triple AP beacon wakeup None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1416239 Documentation changes for Wi-Fi roaming feature None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1392487 SDK Update to 2.11.1 queries None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1502997 Clarification in FEAT_AGGREGATION: WLAN-level aggregation vs. TCP-level expectations. None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1503001 Update the proper description of existing certificate and formation in the readme file of EAP example. None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1503003 Update the note point in the EAP command. None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1503005 Update the description of the Pathlen field in the SAPI PRM. None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1503006 Clarification on rsi_setsockopt() API: Missing option_name details in SAPI product reference manual. 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 WPA3 Connection with Hunting and Pecking algorithm takes about three to four seconds. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA If the station performs a scan in concurrent mode (Wi-Fi STA + AP), stations connected to the AP may be disconnected. Enable AP after the STA connection is completed. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA With powersave, PTA 3-wire co-existence does not work. However, if a weak pull-up is applied on the GRANT pin, the PTA 3-wire functionality works while the power is saved. For further information, refer to Application Notes. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA EAP security in the aws_device_shadow application is unsupported on the EFR platform due to memory constraints. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In STA + AP, if AP started first station scan is supported only in channel in which AP is brought up. If multiple channel scan is requested, AP behaviour is undefined. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA Auto channel selection is not supported in AP mode when the EXT_FEAT_IEEE_80211J feature is enabled. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1250359 WMM tests fail and low throughput is observed when aggregation support is disabled for AP. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
NA In Wi-Fi client mode, disconnections may occur if the AP does not acknowledge QoS null frames when powersave is enabled. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1452090 Disconnections and data transfer issues have been observed with the Ubiquiti Amplifi AP when powersave mode is enabled. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI
1225954 Reduced throughput (~1 Mb) observed during TCP RX with Max_PSP powersave enabled with D-Link 810 AP. None None
  • Hardware boards: All
  • Chip revision: All
  • Host interface: UART, SPI