WiSeConnect 3 - Wi-Fi SDK Version 3.5.0 (June 18 2025) - Release Notes#

Wi-Fi 6 + BLE (WiSeConnect 3) SDK Version 3.5.0

Simplicity SDK Version 2025.6.0

The Wi-Fi software development kit (SDK) provides Wi-Fi 6 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#

Auto Join support
AT Commands support

API Changes#

Wireless Query APIs modified to support fetching more details
Thread priority macros for Event and Command Engine threads

Bug Fixes#

Fixes for Wi-Fi connection issues
Fixes in Wi-Fi scan for performance and accuracy

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#

Added AT Commands support, for accessing SiWx91x wireless, device, and platform functions using text-based commands.
Added Auto Join functionality, for automatic connection and re-connection to an access point based on priorities stored in network profiles.

Enhancements#

Added support for retrieving BSSID information while querying network parameters.
Added Wi-Fi application support for BRD4343Q and BRD4343A radio boards.
Added support for controlling the priorities of the Event and Command Engine threads.
Enhanced the wrap API to handle key buffer sizes greater than 1400 bytes.
Enhanced support for querying the wireless mode used by the connected access point.
Updated the start_dhcp command in the wireless_test application to allow static IP configuration in station mode.
Added support for specifying channel and transmit power while sending data in Wi-Fi transceiver mode.
Added Over-the-air (OTA) Firmware Update and Host OTA Firmware Update support using Amazon ExpressLink integration.
Improved security credential validations in Wi-Fi open security mode.
Added support for specifying no credentials while connecting to an access point in Wi-Fi station mode.
Increased the maximum allowed length of the Wi-Fi Pre-Shared Key (PSK) credential from 32 bytes to 64 bytes.
Increased the range of available listen interval values from uint16_t to uint32_t.
Improved the relevant APIs to return the SL_STATUS_SI91X_HOST_VOLTAGE_OUT_OF_RANGE error code.
Added support for Wi-Fi client, credential management, and MQTT in Wi-Fi Commander.
Added deprecation warnings for deprecated API functions.
Added support for SPI CS control.
Added support for separate regulatory power tables for 802.11ax single-user uplink (SU) and trigger-based (TB) transmissions.
Improved the handling of beacon misses in power save mode.
Improved the handling of Wi-Fi keep-alive packets.
RSSI will be returned as 0xFF when Wi-Fi is disconnected.

Removed Features#

None

Deprecated Features#

None

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#


New API Signature	Deprecated API replaced by this (if any)
sl_wifi_get_wireless_info	None
`SL_WLAN_EVENT_THREAD_PRIORITY`	None
`SL_WLAN_COMMAND_ENGINE_THREAD_PRIORITY`	None
`sl_status_t` sl_wifi_update_su_gain_table`(uint8_t band, uint8_t bandwidth, const uint8_t *payload, uint16_t payload_length, uint8_t x_offset, uint8_t y_offset)`	sl_wifi_update_gain_table
`sl_status_t` sl_si91x_http_otaf_v2`(const sl_si91x_http_otaf_params_t *http_otaf_params)`	sl_si91x_http_otaf
`sl_status_t` sl_wifi_set_listen_interval_v2`(sl_wifi_interface_t interface, sl_wifi_listen_interval_v2_t listen_interval)`	sl_wifi_set_listen_interval
`sl_status_t` sl_wifi_get_listen_interval_v2`(sl_wifi_interface_t interface, sl_wifi_listen_interval_v2_t *listen_interval)`	sl_wifi_get_listen_interval
`sl_status_t` sl_wifi_set_performance_profile_v2`(const sl_wifi_performance_profile_t *profile)`	sl_wifi_set_performance_profile
`sl_status_t` sl_wifi_get_performance_profile_v2`(sl_wifi_performance_profile_t *profile)`	sl_wifi_get_performance_profile
`sl_status_t` sl_wifi_get_listen_interval_v2`(sl_wifi_interface_t interface, sl_wifi_listen_interval_v2_t *listen_interval)`	sl_si91x_set_listen_interval
sl_wifi_listen_interval_v2_t	sl_wifi_listen_interval_t
sl_wifi_performance_profile_v2_t	sl_wifi_performance_profile_t

Modified APIs#

None

Removed APIs#

None

Deprecated APIs#


Deprecated API Name	Planned Removal Date
sl_wifi_update_gain_table	2026-12
sl_si91x_http_otaf	2026-12
sl_wifi_set_listen_interval	2026-12
sl_wifi_get_listen_interval	2026-12
sl_wifi_set_performance_profile	2026-12
sl_wifi_get_performance_profile	2026-12
sl_si91x_set_listen_interval	2026-12
sl_wifi_listen_interval_t	2026-12
sl_wifi_performance_profile_t	2026-12

Bug Fixes#

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

ID	Issue Description	GitHub / Salesforce Reference (if any)	Affected Software Variants, Hardware, Modes, Host Interfaces
1468046	SiWx917 does not respond to Block Ack request in power save mode when connected to a Raspberry Pi access point.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1409909	Wi-Fi re-join after de-authentication takes multiple attempts to connect to a Raspberry Pi 4 access point.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1446458	Issue with Channel Switch Announcements (CSAs) when background scanning is enabled.	None	Firmware variants: Standard only OPNs: All except SIWG917M110LGTBA (Lite OPN) Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1416762	Wi-Fi client interface initialization fails with 0x10003 error in concurrent (station + access point) mode.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1320647	sl_wifi_get_wireless_info API returns incorrect `wlan_state` values in access point mode with WPA3 Transition security.	None	Firmware variants: Standard only OPNs: All except SIWG917M110LGTBA (Lite OPN) Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1310679	sl_wifi_get_wireless_info API returns the wrong security type and PSK in station mode with WPA3 Transition security.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1440215	Issue with the fourth client connection in access point mode with WPA3 security.	None	Firmware variants: Standard only OPNs: All except SIWG917M110LGTBA (Lite OPN) Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1447536	`sl_wifi_get_channel` API fails to return the updated channel number after a Channel Switch Announcement (CSA).	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1366739	`sl_wifi_get_ap_client_count` API returns inaccurate results.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1409397	Command Engine thread not responsive during critical command processing.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1424570	`sl_net_deinit` API hangs when `sl_mqtt_client` is enabled but not initialized.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1416697	`SL_NET_TLS_PRIVATE_KEY_CBC_WRAP` and `SL_NET_TLS_PRIVATE_KEY_ECB_WRAP` credential types fail to load.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1410736	Some error codes were updated with the `0x16` prefix because they overlapped between `sl_additional_status.h` and `sl_status.h`.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1455096	`sl_net_down()` API returns a timeout error during soft reset.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP. Host interfaces: SPI, UART
1417968	Compilation failures on migrating external host projects from SDK v3.3.3 to v3.4.0 and later versions.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: N/A Host interfaces: SPI
1445001	Memory access violation causes MQTT publish failures when access point mode is initiated before station mode.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1373385	WLAN sensitivity degradation is observed in some units in low-power (LP) and high-performance (HP) chains at -40° C.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1465532	The network processor (NWP) fails to enter sleep on the BRD4357A board due to misconfiguration of `SI91X_32kHz_EXTERNAL_OSCILLATOR`.	None	Firmware variants: Standard and Lite OPNs: All Boards: BRD4357A Modes: NCP Host interfaces: SPI
1448532	Device enters sleep mode during DMA data transfer from the network processor (NWP) to application processor (M4), potentially resulting in undefined behavior.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1463764	Wi-Fi client initialization fails with error code `SL_STATUS_CARD_READY_TIMEOUT` in the Station Ping IPv6 application example due to insufficient heap memory.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: NCP Host interfaces: SPI, UART
1425881	Issue with Channel Switch Announcement (CSA) handling in 2.4 GHz station mode operation.	None	Firmware variants: Standard and Lite OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART

Chip Enablement#

None

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

New Examples#

Example Name	Description	Supported Software Variants (if applicable)	Supported Modes	Supported OPNs / Boards / OPN Combinations	Supported Host Interfaces
Wi-Fi - Roaming See README	Demonstrates wireless roaming for seamless network transitions between access points.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI, UART
Wi-Fi Commander See README	Demonstrates the use of Wi-Fi command handling through a command-line interface, allowing users to execute and test a wide range of Wi-Fi operations individually.	Standard	SoC	OPNs: All Boards: BRD4343A Modes: N/A Host interfaces: N/A	N/A
Wi-Fi - DTLS Client See README	Demonstrates opening a UDP client socket and using it with a secure DTLS connection for data transmission.	Standard and Lite	SoC NCP	OPNs: All Boards: All	N/A

Example Name

Description

Supported Software Variants (if applicable)

Supported Modes

Supported OPNs / Boards / OPN Combinations

Supported Host Interfaces

Wi-Fi - Roaming

See README

Demonstrates wireless roaming for seamless network transitions between access points.

Standard and Lite

OPNs: All
Boards: All

SPI, UART

Wi-Fi Commander

See README

Demonstrates the use of Wi-Fi command handling through a command-line interface, allowing users to execute and test a wide range of Wi-Fi operations individually.

Standard

OPNs: All
Boards: BRD4343A
Modes: N/A
Host interfaces: N/A

N/A

Wi-Fi - DTLS Client

See README

Demonstrates opening a UDP client socket and using it with a secure DTLS connection for data transmission.

Standard and Lite

OPNs: All
Boards: All

N/A

Modified Examples#

Example Name	Changes	Supported Software Variants if applicable	Supported Modes	Supported OPNs / Boards / OPN Combinations	Supported Host Interfaces
Wi-Fi - Embedded MQTT CLIENT See README	Fixed PSK credential corruption occurring during repeated WLAN connection attempts.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI
Wireless Test See README	Fixed an issue in the wireless_test application that caused connection failures to access points using Wi-Fi open security mode. Replaced the deprecated API `sl_wifi_update_gain_table` with the new API sl_wifi_update_su_gain_table, which supports additional configuration to increase the gain in 11ax SU operations. This new API can also be used to update 11ax TB values.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI, UART
Wi-Fi - AWS IoT MQTT CLIENT See README	Added the `sl_net_set_wrapped_private_key` function and new credential types for enhanced key management.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI
Wi-Fi - Select App See README	Fixed error handling for `SL_SI91X_EXT_TCP_IP_TOTAL_SELECTS` when not configured.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI
Wi-Fi - Azure IoT MQTT Client Application See README	Fixed Azure IoT connection issues in the process loop with state machine checks.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI
Wi-Fi - HTTP Client See README	Fixed issue with the HTTP server hanging in a loop, and improved response latency.	Standard and Lite	SoC NCP	OPNs: All Boards: All	SPI, UART
Wi-Fi - User Gain Table See README	Replaced the deprecated API `sl_wifi_update_gain_table` with the new API sl_wifi_update_su_gain_table, which supports additional configuration to increase the gain in 11ax SU operations. This new API can also be used to update 11ax TB values..	Standard and Lite	SoC NCP	OPNs: All QFN OPNs Boards: All	SPI, UART

Removed Examples#

None

Deprecated Examples#

None

Known Issues and Limitations#

Note: See the Feature Matrix section for a list of all hardware parts that work with the WiSeConnect 3 SDK.

ID	Issue or Limitation Description	GitHub / Salesforce Reference (if any)	Workaround (if any)	Affected Software Variants, Hardware, Modes, Host Interfaces
1454142	The beacon reception region is elongated before the PS Poll is sent, leading to increased current consumption, under -85 dB RSSI and 70% congestion.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1454069	23 consecutive beacon wakeups occur over a period of 4.3 seconds due to beacon misses, when the beacon miss threshold is set to 3, under -85 dB RSSI and 70% congestion.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1458372	MCS rates drop in between data transfers causing a reduction in SSL RX throughput.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1467697	Simplicity Studio only shows 27 out of over 100 examples when the OPN SIWG917Y110LGABA or SIWG917Y121MGABA is selected.	None	None	OPNs: SIWG917Y110LGABA SIWG917Y121MGABA Boards: None Modes: SoC Host interfaces: N/A
1454907	SiWx917 fails to connect to an enterprise access point when using NVM3 storage.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1268204	SiWx917 fails to enter deep sleep mode in the WLAN Deep Sleep application.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: UART
1451898	Set credential commands accept invalid SSID or PSK lengths without returning an error.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1463912	AES encryption stops working after network processor (NWP) power save is enabled.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1462913	SiWx917 hangs when the access point sends a de-authentication frame with the reason code "Disassociated due to inactivity (0x0004)" during continuous DTLS data transfer.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1406129	Command engine gets stuck in a waiting state under poor RSSI conditions.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1467698	Enhanced `sl_wifi_get_firmware_version()` API to provide more details (ROM ID, chip ID, security version, etc.) which is not backward compatible with firmware older than 1711.2.10.1.0.0.4. Firmware binary notation does not include the security version number.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
N/A	Command Engine stack overflow can occur if local variables are used in user callback.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1310207	Beacon misses from the access point may occur when channel congestion exceeds 85%.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
N/A	When scanning with low-power mode is enabled, a WLAN sensitivity degradation of 3-6 dB is observed, which may prevent access points at longer ranges from appearing in the scan results.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1350997	Advanced scan feature is not supported in access point mode.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1199044	Connection issues may be seen with configuring certificate key and programming 4096 bit key and SHA384 / SHA512 certificates in station mode with WPA2 enterprise security.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
N/A	Less throughput observed in DL-OFDMA with some access points that enabled low-density parity check coding.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1467933	Performance and interoperability issues with MU MIMO with certain access points.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A
1218972	When the `sl_wifi_enable_target_wake_time` API is used, occasional MQTT disconnections may be observed if TWT is configured with longer TWT intervals (>30 seconds) with embedded MQTT + TWT.	None	Use the `sl_wifi_target_wake_time_auto_selection` API where these dependencies are internally handled.	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1448461	Binaries created using the CMake generator hang at runtime after OTA upgrades.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1467703	Connection issue with third-party access point in concurrent mode using the web page.	None	None	OPNs: All Boards: All Modes: NCP Host interfaces: SPI, UART
1357685	Extended scan results are not supported with MBSSID feature enabled.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1443112	CSA with power save enabled may cause the SiWx917 device to re-join the access point.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1435733	SiWx917 returns incorrect RSSI values at high attenuation levels.	None	None	OPNs: All Boards: All Modes: SoC, NCP Host interfaces: SPI, UART
1439592	SiWx917 power save does not work in station mode when M4 retention is disabled and network processor (NWP) memory is configured at 416 KB or 480 KB.	None	None	OPNs: All Boards: All Modes: SoC Host interfaces: N/A