The Blog (Posts by Systerel)

S2OPC 1.7.3 release

Systerel — Mon, 08 Jun 2026 13:09:16 GMT

The S2OPC team is proud to announce the 1.7.3 release of S2OPC.

This is mainly a security release. It fixes two vulnerabilities related to certificate trust and revocation checking, and we strongly recommend all users to upgrade. It also brings a new feature completing the Cyclone library wrapper, along with several enhancements and bug fixes.

Read more… (1 min remaining to read)

S2OPC 1.7.2 release

Systerel — Wed, 25 Mar 2026 14:14:36 GMT

The S2OPC team is proud to announce the 1.7.2 release of S2OPC.

This release introduces several improvements including:

Alarms and Conditions: first support of the OPC UA AlarmConditionType
Optional structure fields: support for OPC UA Unions and Structures with optional fields
Thread-safe dictionary: a new thread safe dictionary API
Session management: the server wrapper can now terminate sessions (except one)

S2OPC 1.7.1 release

Systerel — Tue, 17 Feb 2026 13:24:03 GMT

The S2OPC team is proud to announce the 1.7.1 release of S2OPC.

This is a maintenance release following the 1.7.0 version. It brings a few enhancements and a security-related bug fix that adds a check for a buffer over-read while verifying the signature of secure channel message chunks (see issue #1704).

Read more… (1 min remaining to read)

S2OPC 1.7.0 release

Systerel — Tue, 20 Jan 2026 08:56:51 GMT

The S2OPC team is proud to announce the 1.7.0 release of S2OPC.

This release introduces several improvements including:

Security Audit: fires OPC UA events in case of cybersecurity related events
Role Permission: to assign permissions to roles rather than individual users, simplifying management and improving security
PubSub Extended Support: it is now available on Windows
History Read: adds the capacity for the server to store previous values of nodes
Node Management : completes the services to add and delete nodes run time
Performance Improvement: improves performance of write/add nodes operations
Zephyr 4.1 Support: compatible with the latest version of this real-time operating system

S2OPC 1.6.0 release

Systerel — Mon, 27 Jan 2025 08:56:51 GMT

The S2OPC team is proud to announce the 1.6.0 release of S2OPC.

This release introduces several improvements including:

OPC UA events management
Support of Zephyr revision 3.6 (see issue #1464)
Support of PikeOS revision 5.1 (thanks to our partner SYSGO) (see issue #1160)
Support of MbedTLS revision 3 (see issue #1446)
A complete rework of our Python binding PyS2OPC (see issue #1251)

As this revision contains important cybersecurity fixes, we advice all our customers to switch to this new revision.

Un nouveau cœur pour OVADO

Systerel — Tue, 05 Nov 2024 15:50:49 GMT

Depuis plus de 10 ans le département MOP réalise des prestations de validation de données avec l'outil OVADO²® propriété de la RATP, qui est maintenu et distribué par Systerel.

Les delta aggregates en △da₂₀₂₂

Systerel — Thu, 10 Oct 2024 10:36:11 GMT

Ada₂₀₂₂ a introduit la notion de delta aggregate permettant de modifier un objet sans passer nécessairement par une ou des données intermédiaires.

Cette fonctionnalité s'applique aussi bien aux structures qu'aux tableaux unidimensionnels.

Read more… (1 min remaining to read)

S2OPC 1.5.1 release

Systerel — Thu, 13 Jun 2024 08:56:51 GMT

The S2OPC team is proud to announce the 1.5.1 release of S2OPC.

The main new features are the availability of a demo server implementing the Push Management model according to the OPC UA part 12 (see issue #1247), and a hook to re-evaluate X509IdentityToken certificates for all sessions (on server side, see issue #1370).

Read more… (1 min remaining to read)

S2OPC 1.5.0 release

Systerel — Tue, 06 Feb 2024 08:56:51 GMT

The S2OPC team is proud to announce the 1.5.0 release of S2OPC.