0.3-rc2

This is the second release candidate of what will become open62541 v0.3. The API has been frozen and only backwards-compatible patches will be applied before v0.3. Compared to the RC1 (0.3-rc1) this version includes additional bugfixes and small improvements under the hood while keeping the same API as 0.3-rc1. For the final 0.3 release there is still the CTT compliance test missing.

open62541 (http://open62541.org) is an open source and free implementation of OPC UA (OPC Unified Architecture) written in the common subset of the C99 and C++98 languages. The library is usable with all major compilers and provides the necessary tools to implement dedicated OPC UA clients and servers, or to integrate OPC UA-based communication into existing applications. open62541 library is platform independent. All platform-specific functionality is implemented via exchangeable plugins. Plugin implementations are provided for the major operating systems.

open62541 is licensed under the Mozilla Public License v2.0. So the open62541 library can be used in projects that are not open source. Only changes to the open62541 library itself need to published under the same license. The plugins, as well as the server and client examples are in the public domain (CC0 license). They can be reused under any license and changes do not have to be published.

The most important changes compared to the 0.2 branch are as follows.

• Support for encrypted SecureChannels
• Support for node-based access control
• Support for client-side subscriptions handling in the background
• Support for custom storage layers for the information model
• Improved lifecycle handling for nodes (constructors and destructors)
• Improved documentation

The final release will be made in the coming weeks after a period of stabilisation and additional testing.