open62541 ========= open62541 (http://open62541.org) is an open source and free implementation of OPC UA (OPC Unified Architecture). open62541 is a C-based library that contains all the necessary tools to set up a dedicated OPC UA server or to integrate OPC UA-based communication into existing applications (linking with C++ projects [is possible](examples/server.cpp)). An example server implementation can be found in the [/examples](examples/) directory or further down on this page. open62541 is licensed under the LGPL + static linking exception. That means **open62541 can be freely used also in commercial projects**, although changes to the open62541 library itself need to be released under the same license. The server and client implementations in the [/examples](examples/) directory are in the public domain (CC0 license). They can be used under any license and changes don't have to be published. [![Ohloh Project Status](https://www.ohloh.net/p/open62541/widgets/project_thin_badge.gif)](https://www.ohloh.net/p/open62541) [![Build Status](https://travis-ci.org/acplt/open62541.png?branch=master)](https://travis-ci.org/acplt/open62541) [![Coverage Status](https://coveralls.io/repos/acplt/open62541/badge.png?branch=master)](https://coveralls.io/r/acplt/open62541?branch=master) [![Coverity Scan Build Status](https://scan.coverity.com/projects/1864/badge.svg)](https://scan.coverity.com/projects/1864) ### Documentation A general introduction to OPC UA and the open62541 documentation can be found at http://open62541.org/doc. Build instruction are here: https://github.com/acplt/open62541/wiki/Building-open62541. For discussion and help, you can use - the [mailing list](https://groups.google.com/d/forum/open62541) - our [IRC channel](http://webchat.freenode.net/?channels=%23open62541) - the [bugtracker](https://github.com/acplt/open62541/issues) ### Contribute to open62541 As an open source project, we invite new contributors to help improving open62541. If you are a developer, your bugfixes and new features are very welcome. Note that there are ways to contribute even without deep knowledge of the project or the UA standard: - [Report bugs](https://github.com/acplt/open62541/issues) - Improve the [documentation](http://open62541.org/doc) - Work on issues marked as "[easy hacks](https://github.com/acplt/open62541/labels/easy%20hack)" ### Example Server Implementation ```c #include /* provided by the open62541 lib */ #include "ua_server.h" /* provided by the user, implementations available in the /examples folder */ #include "logger_stdout.h" #include "networklayer_tcp.h" #define WORKER_THREADS 2 /* if multithreading is enabled */ #define PORT 16664 UA_Boolean running = UA_TRUE; void signalHandler(int sign) { running = UA_FALSE; } int main(int argc, char** argv) { /* catch ctrl-c */ signal(SIGINT, signalHandler); /* init the server */ UA_Server *server = UA_Server_new(); NetworklayerTCP *nl = ServerNetworkLayerTCP_new(UA_ConnectionConfig_standard, PORT); UA_Server_addNetworkLayer(server, nl); /* add a variable node */ UA_Int32 *myInteger = UA_Int32_new(); *myInteger = 42; UA_Variant *myIntegerVariant = UA_Variant_new(); UA_Variant_setValue(myIntegerVariant, myInteger, &UA_TYPES[UA_TYPES_INT32]); UA_QualifiedName myIntegerName; UA_QUALIFIEDNAME_ASSIGN(myIntegerName, "the answer"); UA_Server_addVariableNode(server, myIntegerVariant, /* the variant */ &UA_NODEID_NULL, /* assign a new nodeid */ &myIntegerName, /* the browse name */ /* the parent node and the referencetype to the parent */ &UA_NODEID_STATIC(0, UA_NS0ID_OBJECTSFOLDER), &UA_NODEID_STATIC(0, UA_NS0ID_ORGANIZES)); /* run the server loop */ UA_StatusCode retval = UA_Server_run(server, WORKER_THREADS, &running); UA_Server_delete(server); return retval; } ```