WiSeConnect 3 - Network Stack 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 Network Stack software development kit (SDK) provides core and advanced networking features with Wi-Fi IoT cloud integration.
Click here for earlier releases.
Release Summary#
Key Features | API Changes | Bug Fixes | Chip Enablement
Key Features#
Dual network stack support
DTLS client socket support
mDNS over IPv6 support
Support for socket bind before Wi-Fi connection
API Changes#
None
Bug Fixes#
Stability fixes for TLS sockets and VLAN
Fix for IP configuration failure
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 support for DTLS client sockets.
Added support for mDNS over IPv6.
Added support for MQTT over WebSockets and TCP.
Added support for dual network stacks, enabling simultaneous operation of both the embedded, offloaded network stack and the hosted network stack.
Enhancements#
Added support for multiple key-value pairs in the mDNS TXT record during service registration.
Added a feature bit to allow socket commands prior to Wi-Fi connection.
Added a feature bit to allow socket bind commands prior to Wi-Fi connection and IP configuration.
Added support for automatic handling of TLS SNI extension and default TLS version handling for the HTTP client feature.
Enhanced the HTTP Over-the-air firmware (OTAF) update feature with TLS 1.3 support and automated handling of the TLS SNI extension.
Added support for three DTLS client sockets.
Added support for enabling DTLS with both version 1.0 and version 1.2.
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) |
|---|---|
| No |
Modified APIs#
None
Removed APIs#
None
Deprecated APIs#
None
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 |
|---|---|---|---|
| 1411229 | Application becomes unresponsive when closing sockets. | None |
|
| 1415701 |
Issue with error handling of SL_SI91X_EXT_TCP_IP_TOTAL_SELECTS when not configured.
|
None |
|
| 1371151 | HTTP server hangs in a loop and can be unresponsive. | None |
|
| 1440922 | RX buffers are not properly released during socket read operations and remote socket termination within the loop. | None |
|
| 1424189 |
Fixed incorrect data type for SSL option value that caused compilation errors, and addressed redundant checkpoints that led to setsockopt failures.
|
None |
|
| 1448768 |
Race condition between the remote terminate event and application-initiated read operations results in an additional read request after all data was read, causing the SDK to return the SL_STATUS_SI91X_SOCKET_CLOSED error code.
|
None |
|
| 1444632 | IP change notification is not sent in idle mode or during ping data transfer. | None |
|
| 1376229 |
LwIP TCP/IP thread priority must be set to osPriorityNormal to improve task scheduling.
|
None |
|
| 1438876 | HTTP server fails to start when the interface is down. | None |
|
| 1451392 | Issue with mDNS usage with IPv6 Link-Local addressing. | None |
|
| 1447445 | Issue with IP configuration failure followed by module disconnection. | None |
|
| 1431443 | During DTLS, the device will now stay awake even if power save is enabled. | None |
|
| 1413268 | UDP/TCP data corruption occurs when VPN is enabled in the network. | None |
|
| 1451205 | IP configuration fails when attempting to reconnect to the access point. | None |
|
| 1309088 | Firmware updates fail when using the default NCP UART example application. | None |
|
| 1404067 | SSL / TLS vulnerability fixed by implementing secure re-negotiation. | None |
|
| 1390329 | Stability issues with Wi-Fi station and access point instances in concurrent mode during socket creation, closure, data reading, and LTCP socket operations when re-join events occur. | None |
|
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#
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 |
|---|---|---|---|---|
| 1463929 | Wrap operation fails when performing TLS transmission and HMAC operations concurrently in two application threads. | None | None |
|
| 1467702 | Issue with the firmware update over TCP in a dense environment. | None | None |
|
| 1454747 |
OTA firmware upgrade fails with error 0x1DD15 after ~185-189 iterations during BLE advertising/connection.
|
None | None |
|
| 1453556 |
Socket read timeout (0x1FF6A) error is returned when accessing the web page from a third-party station connected to APUT.
|
None | None |
|
| N/A | Power save with TCP/IP is not supported with the UART host interface in the non-bypass mode. | None | None |
|
| 745282 |
Occasionally, during a TLS handshake, the device generates incorrect ECC curve parameters, causing a connection failure that results in a BBD2 error.
|
None | The error is recovered in the next attempt. |
|
| 1390329 | Data transfer over the Link-local address always uses the first IP interface created by the application, when using concurrent mode. | None | None |
|
| 1133422 | HTTP PUT does not support the SNI extension. | None | None |
|
| N/A | Embedded MQTT username is supported only up to 120 bytes. | None | None |
|
| N/A | Embedded MQTT topic length is supported only up to 200 bytes. | None | None |
|
| N/A | Embedded MQTT password is supported only up to 62 bytes. | None | None |
|
| N/A | HTTP GET URL length is only supported up to 2048 bytes. | None | None |
|
| N/A | More than 3 SSL connections are not supported. | None | None |
|
| 1453542 | A third-party Wi-Fi station connected to the SiWx917 access point fails to access the web page over several hours of UDP TX/RX traffic on the station interface. | None | None |
|
| 1454728 | HTTP server experiences a connection reset when the web page is refreshed multiple times. | None | None |
|
| 1457125 | The SiWx917 device fails to connect to AWS Cloud when using a root CA3 certificate. | None | None |
|