CDP's fork of the open62541 OPC UA stack (https://github.com/open62541/open62541)

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deps 0ed23beeb7 cleaning up 9 년 전
doc 8ee327ac44 add introduction to UA to documentation. reset doxygen style until a more complete reskin is ready 10 년 전
examples 58b17a6112 split examples per-feature 9 년 전
include 58b17a6112 split examples per-feature 9 년 전
ports acce5eedd3 fix wago port 9 년 전
src 58b17a6112 split examples per-feature 9 년 전
tests 404992459b add example with datasource 9 년 전
tools f9bfd6f5f3 add old compiler flags 10 년 전
.gitignore 9f6a679802 updated gitignore 10 년 전
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AUTHORS c495d9b248 Update AUTHORS 10 년 전
CMakeLists.txt 58b17a6112 split examples per-feature 9 년 전
LICENSE 9310d323c9 changed .gitignore again 11 년 전
LICENSE-CC0 f8265df738 clean up include structure 10 년 전
README.md 93e02be509 Update README.md 10 년 전

README.md

open62541

open62541 (http://open62541.org) is an open-source 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. An example server implementation can be found in the /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 directory are in the public domain (CC0 license). They can be used under any license and changes don't have to be published.

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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

Contribute to open62541

As an open source project, we invite new contributors to help improving open6241. 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:

Example Server Implementation

#include <signal.h>

/* provided by the open62541 lib */
#include "ua_server.h"
#include "ua_namespace_0.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 = NetworkLayerTCP_new(UA_ConnectionConfig_standard, PORT);
    UA_Server_addNetworkLayer(server, nl);

    /* add a variable node */
    UA_Int32 myInteger = 42;
    UA_String myIntegerName;
    UA_STRING_STATIC(myIntegerName, "The Answer");
    UA_Server_addScalarVariableNode(server,
                 /* the browse name, the value, and the datatype vtable */
                 &myIntegerName, (void*)&myInteger, &UA_TYPES[UA_INT32],
                 /* the parent node of the variable */
                 &UA_NODEIDS[UA_OBJECTSFOLDER],
                 /* the (hierarchical) referencetype from the parent */
                 &UA_NODEIDS[UA_ORGANIZES]);

    /* run the server loop */
    UA_StatusCode retval = UA_Server_run(server, WORKER_THREADS, &running);
	UA_Server_delete(server);
	return retval;
}