Wi-Fi 6 + BLE (RCP) 2.15.0 (April 8, 2026) - Release Notes#

The SiWT917 RCP Driver is a SoftMAC driver that interacts with the Linux wireless MAC layer, MAC80211. It consists of simple and efficient kernel modules that currently support SiWT917 RCP chipsets and can be ported to any embedded platform, in addition to the X-86 platform.

Click here for SiWT917 releases.

Release Summary#

Release Item Version Release Date Release Notes Key Features Bug Fixes Chip Enablement
Wi-Fi 2.15.0 April 8, 2026 Release Notes
  • Added kernel support till 6.12.
  • Added support for module refresh (external low-power XTAL option support).
  • Fixed delay issue while creating the VAP.
  • Fixed beacon and broadcast reception issues in congested environments.
  • Fixed an issue where the module was incorrectly identifying early beacons from the AP, leading to excessive power consumption during long-run tests.
  • Improved Wi-Fi RSSI Accuracy for high attenuation levels.
  • Fixed Beacon reception issues in congested environment.
  • Disabled RF turnoff till the end of packet on air when the packet is dropped.
 OPN : SIWT917Y100XGAXA

Board: SiW917Y-RB4357C
Bluetooth LE 2.15.0 April 8, 2026 Release Notes None
  • Fixed a BLE disconnection issue that occurred when the DUT attempted to connect to an access point while configured for the China (SRRC) region only.
  • Fixed an issue where the output transmit power was higher in end-to-end mode compared to PER test mode across all temperatures.
  • Fixed an issue where the central device was unable to establish a BLE Advertising Extension (AE) connection when operating with LE Coded PHY rates.
  • Fixed a SiWx917Y BLE test power mismatch where SRRC ('cn') region output was 2 dB higher than 'us'.
  • Functional fixes for RSSI accuracy.
 OPN : SIWT917Y100XGAXA

Board: SiW917Y-RB4357C
Multiprotocol 2.15.0 April 8, 2026 Release Notes
  • Added KC and SRRC region selection support in PER mode for Wi-Fi and BLE.
 None OPN : SIWT917Y100XGAXA

Board: SiW917Y-RB4357C

Using This Release#

What's in the Release? | Release Details | Installation and Use | Help and Feedback

What's in the Release?#

  • si91x-rcp-driver

  • The si91x-rcp-driver release consists of the following components

    • Firmware - SiWT917 Firmware Binary

    • rsi - SiWT917 RCP driver source code

    • apps - contains driver tools source code

    • release - contains kernel modules and script files

  • This software is meant only for use with designs based on SiWT917 Silicon

Release Details#

Item Details

Release Date

April 8, 2026

Firmware Version

1711.2.15.1.0.0.4

Package Name

SiWT917.2.15.0.4

Linux Kernel Version support

From v3.18 to v6.12

Host interfaces supported

SDIO

Operating Modes Supported

Wi-Fi STA, Wi-Fi AP, Wi-Fi STA+BLE, Wi-Fi STA+AP, BLE

Installation and Use#

To get started with the SiWT917 Linux driver in RCP mode, see our Getting Started Guides.

To kick start your development and debugging with the SiWT917 Linux driver in RCP mode, see our Developers Guide.

To review Security and Software Advisory notifications and manage your notification preferences:

  1. Go to https://community.silabs.com/.

  2. Log in with your account credentials.

  3. Click your profile icon in the upper-right corner of the page.

  4. Select Notifications from the dropdown menu.

  5. In the Notifications section, go to the My Product Notifications tab to review historical Security and Software Advisory notifications.

  6. To manage your preferences, use the Manage Notifications tab to customize which product updates and advisories you receive.

For recommended settings, configurations, and usage guidelines, see the Recommendations section.

To learn more about the software in this release, dive into our online documentation.

Help and Feedback#

Supported Hardware OPNs#

Hardware Ordering Part Number (OPN)
OPNS QFN OPN: SIWT917M100XGTBA.

Module OPN: SIWT917Y100XGNBA Module with RF-PIN, SIWT917Y100XGABA Module with Antenna.

Module Refresh OPN : SIWT917Y100XGAXA Module Refresh (This module will be available after launch)
Expansion kits SiWx917-EB4346A (based on Radio board SiWx917-4346A + 8045A Co-Processor Adapter board or 8045B Co-Processor Raspberry Pi Adapter board).

Module Board: SiW917Y-RB4357A (SiWT917Y Module Wi-Fi 6 and Bluetooth LE Co-Processor Radio Board).

Module Board: SiW917Y-RB4357C (SiWx917 Module Refresh Wi-Fi 6 and Bluetooth LE Co-Processor Radio Board)

Features Supported#

Wi-Fi | BLE | Multi-protocol

Wi-Fi#

  • Operating Modes:#

    • Wi-Fi STA (802.11ax, 802.11n),

    • Wi-Fi 802.11n AP,

    • Wi-Fi STA (802.11ax, 802.11n) + 802.11n AP,

    • Wi-Fi STA (802.11ax, 802.11n) + BLE,

    • BLE

  • Host Interface :#

    • SDIO 2.0

  • Power save#

    • Deep Sleep

    • Connected Sleep

    • Host-based wake-up

  • Wi-Fi Protocols#

    • IEEE 802.11 b/g/n/ax (2.4 GHz)

  • Wi-Fi Station mode#

    • Scan#

      • Selective Scan

      • Active/Passive Scanning

    • Wi-Fi Security#

      • Open Mode

      • WPA2 Personal, WPA2 Enhancements

      • WPA2 Enterprise

      • WPA3 Personal

      • Mixed Mode (WPA/WPA2)

      • WPA3 Personal Transition Mode (WPA2/WPA3)

    • Wi-Fi STA Rejoin#

    • Wi-Fi STA Roaming#

      • BG Scan

      • OKC (Opportunistic Key caching)

      • PMK (Pairwise Master Key) caching

      • Pre-Authentication

    • Wi-Fi Protocol Power save#

      • Deep sleep (unconnected state)

      • Max PSP

      • Enhanced Max PSP

      • Fast PSP

      • TWT

    • QoS#

      • WMM-QoS

    • Wi-Fi 6 Feature#

      • MU-MIMO (DL)

      • OFDMA (UL/DL)

      • iTWT,TWT I-Frame & TWT Enhancements

      • BSS coloring

      • MBSSID

  • Access Point (AP) mode#

    • 8 Client Support

    • Wi-Fi Security

      • Open Mode

      • WPA2 Personal

      • WPA2 Enterprise

      • WPA3 Personal (H2E method only)

      • WPA Mixed mode (WPA/WPA2)

    • Hidden SSID Mode

    • Auto Channel Selection

  • WPA2 Enterprise security#

    • Method

      • PEAP/TTLS/TLS/FAST

  • Wi-Fi Concurrency#

    • AP+STA (Same channel)

    • Scan in AP mode

  • Wi-Fi Band/Channels#

    • 2.4GHz CH1-11 (US)

    • 2.4GHz CH1-13 (Europe)

    • 2.4GHz CH1-14 (Japan)

  • Known Security vulnerabilities handled#

    • WPA2 KRACK Attacks

    • Fragment and Forge Vulnerability

BLE#

  • Security

  • Accept list

  • LE PHY(1Mbps, 2Mbps) & Coded PHY(125Kbps, 500kbps)

  • Simultaneous scanning on 1M and Coded PHY

  • LE dual role topology

  • LE data packet length extensions( DLE)

  • Asymmetric PHYs

  • LE channel selection algorithm 2 (CSA#2)

  • Bluetooth 5.4 Qualified

Multi-protocol#

  • Wi-Fi STA + BLE

  • PTA Coexistence#

    • 3 wire coex acting as Wi-Fi Station with external Bluetooth

    • 3 wire coex acting as Wi-Fi Station with external Zigbee/OT

Recommendations#

Wi-Fi | BLE | Multi-protocol

Wi-Fi#

  • Set the recommended Power Save Profile (PSP) type to Enhanced Max PSP.

  • Disable power save for higher throughput values or use FAST PSP power save mode as per application requirement.

BLE#

  • In BLE, the recommended range of Connection Interval in

    • Power Save (BLE Only) - 100 ms to 1.28 s.

  • In BLE, during Connection, the configuration of Scan Interval and Scan Window with the same value is not recommended. The suggested ratio of Scan Window to Scan Interval is 3:4.

  • In BLE, if a device is acting as Central, the scan window must be less than the existing Connection Interval. The suggested ratio of Scan Window to Connection Interval is 2:3.

  • In BLE mode, if scanning and advertising are in progress on the SiWx91x module and it subsequently gets connected and moves to the central role, scanning stops else if it moves to the peripheral role, advertising stops. To further establish a connection to another peripheral device or to a central device, the application should give a command for starting advertising and scanning again.

  • Recommend using XTAL clock for BLE instead of RC clock.

Multi-protocol#

  • For concurrent Wi-Fi + BLE, and while a Wi-Fi connection is active, we recommend setting the ratio of the BLE scan window to BLE scan interval to 1:3 or 1:4.

  • Wi-Fi + BLE Advertising

    • All standard advertising intervals are supported. As Wi-Fi throughput is increased, a slight difference in on-air advertisements compared to configured intervals may be seen.

    • BLE advertising is skipped if the advertising interval collides with Wi-Fi activity.

  • Wi-Fi + BLE scanning

    • All standard scan intervals are supported. For better scan results, we recommend setting the ratio of the BLE scan window to BLE scan interval to 1:3 or 1:4.

    • BLE scanning will be stopped for intervals that collide with Wi-Fi activity.

  • Wi-Fi + BLE Central/Peripheral Connections

    • All standard connection intervals are supported.

    • For a stable connection, use optimal connection intervals and max supervision timeout in the presence of Wi-Fi activity.

  • Wi-Fi + BLE Central/Peripheral Data Transfer

    • To achieve higher throughput for both Wi-Fi and BLE, use medium connection intervals, such as 45 to 80 ms with maximum supervision timeout.

    • Ensure Wi-Fi activity consumes lower intervals.

Known Issues#

Wi-Fi | BLE | Multi-protocol

Wi-Fi#

None

BLE#

  • BLE connected power consumption has increased following the transmit power alignment fix. The increase is approximately 8% at the 200ms connection interval and approximately 29% at the 1.28 sec connection interval.

Multi-protocol#

None

Limitations and Unsupported Features#

Wi-Fi | BLE | Multi-protocol

Wi-Fi#

None

BLE#

None

Multi-protocol#

None