open62541库文件
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# open62541
open62541 () 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 (MPLv2). This allows the open62541 library to be combined and distributed with any proprietary software. Only changes to the open62541 library itself need to be licensed under the MPLv2 when copied and distributed. 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 library is [available](https://github.com/open62541/open62541/releases) in standard source and binary form. In addition, the single-file source distribution merges the entire library into a single .c and .h file that can be easily added to existing projects. Example server and client implementations can be found in the [/examples](examples/) directory or further down on this page.
## Project Information
Build Status:
[![Build Status](https://img.shields.io/travis/open62541/open62541/master.svg)](https://travis-ci.org/open62541/open62541)
[![Build Status](https://dev.azure.com/open62541/open62541/_apis/build/status/open62541.open62541?branchName=master)](https://dev.azure.com/open62541/open62541/_build/latest?definitionId=1&branchName=master)
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[![Build Status](https://img.shields.io/docker/cloud/build/open62541/open62541)](https://cloud.docker.com/u/open62541/repository/docker/open62541/open62541)
Code Quality:
[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/open62541.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:open62541)
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General Project Info:
[![Open Hub Project Status](https://www.openhub.net/p/open62541/widgets/project_thin_badge.gif)](https://www.openhub.net/p/open62541/)
[![Overall Downloads](https://img.shields.io/github/downloads/open62541/open62541/total.svg)](https://github.com/open62541/open62541/releases)
### Features and Certification
open62541 implements the OPC UA binary protocol stack as well as a client and server SDK. The final server binaries can be well under 100kb, depending on the selected features and the size of the information model.
- Communication Stack
- OPC UA binary protocol
- OPC UA JSON encoding
- Secure communication with encrypted messages
- Exchangeable network layer (plugin) for using custom networking APIs (e.g. on embedded targets)
- Support for generating data types from standard XML definitions
- Server
- Support for all OPC UA node types
- Access control for individual nodes
- Support for generating server-side information models from standard XML definitions (nodesets)
- Support for adding and removing nodes and references also at runtime.
- Support for inheritance and instantiation of object- and variable-types (custom constructor/destructor, instantiation of child nodes)
- Support for subscriptions/monitoreditems (data change notifications and events)
- Client
- All OPC UA services supported
- Asynchronous service requests
- Background handling of subscriptions
- Publish/Subscribe
- UADP Binary protocol with UDP-multicast or Ethernet communication
- PubSub JSON encoding
### Official Certification
The sample server (server_ctt) built using open62541 v1.0 is in conformance with the 'Micro Embedded Device Server' Profile of OPC Foundation supporting OPC UA client/server communication, subscriptions, method calls and security (encryption) with the security policies 'Basic128Rsa15', 'Basic256' and 'Basic256Sha256' and the facets 'method server' and 'node management'. See https://open62541.org/certified-sdk for more details.
PubSub (UADP) is implemented in open62541. But the feature cannot be certified at this point in time (Sep-2019) due to the lack of official test cases and testing tools.
During development, the Conformance Testing Tools (CTT) of the OPC Foundation are regularly applied.
The CTT configuration and results are tracked at https://github.com/open62541/open62541-ctt. The OPC UA profiles under regular test in the CTT are currently:
- Micro Embedded Device Server
- Method Server Facet
- Node Management Facet
- Security Policies
- Basic128Rsa15
- Basic256
- Basic256Sha256
- User Tokens
- Anonymous Facet
- User Name Password Server Facet
See the page on [open62541 Features](FEATURES.md) for an in-depth look at the support for the conformance units that make up the OPC UA profiles.
### Dependencies
On most systems, open62541 requires the C standard library only. For dependencies during the build process, see the following list and the [build documentation](https://open62541.org/doc/current/building.html) for details.
- Core Library: The core library has no dependencies besides the C99 standard headers.
- Default Plugins: The default plugins use the POSIX interfaces for networking and accessing the system clock. Ports to different (embedded) architectures are achieved by customizing the plugins.
- Building and Code Generation: The build environment is generated via CMake. Some code is auto-generated from XML definitions that are part of the OPC UA standard. The code generation scripts run with both Python 2 and 3.
**Note:**
Specific optional features are dependent on third-party libraries. These are all listed under the `deps/` folder.
Depending on the selected feature set, some of these libraries will be included in the resulting library.
More information on the third-party libraries can be found in the corresponding [deps/README.md](deps/README.md)
### Code Quality
We emphasize code quality. The following quality metrics are continuously checked and are ensured to hold before an official release is made:
- Zero errors indicated by the Compliance Testing Tool (CTT) of the OPC Foundation for the supported features
- Zero compiler warnings from GCC/Clang/MSVC with very strict compilation flags
- Zero issues indicated by unit tests (more than 80% coverage)
- Zero issues indicated by clang-analyzer, clang-tidy, cpp-check and the Codacy static code analysis tools
- Zero unresolved issues from fuzzing the library in Google's oss-fuzz infrastructure
- Zero issues indicated by Valgrind (Linux), DrMemory (Windows) and Clang AddressSanitizer / MemorySanitizer for the CTT tests, unit tests and fuzzing
### Documentation and Support
A general introduction to OPC UA and the open62541 documentation can be found at http://open62541.org/doc/current.
Past rel
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