CDP's fork of the open62541 OPC UA stack (https://github.com/open62541/open62541)
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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 library is available 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 directory or further down on this page.
For a complete list of features check: open62541 Features
open62541 implements the OPC UA binary protocol stack as well as a client and server SDK. It currently supports the Micro Embedded Device Server Profile plus some additional features. The final server binaries can be well under 100kb, depending on the size of the information model.
Features still missing in the 0.2 release are:
A general introduction to OPC UA and the open62541 documentation can be found at http://open62541.org/doc/current. Past releases of the library can be downloaded at https://github.com/open62541/open62541/releases. To use the latest improvements, download a nightly build of the single-file distribution (the entire library merged into a single source and header file) from http://open62541.org/releases. Nightly builds of MSVC binaries of the library are available here.
For discussion and help, you can use
Besides the general open62541 community, a group of core maintainers jointly steers the long-term development. The current core maintainers are (as of Mai 2017, in alphabetical order):
As an open source project, we encourage new contributors to help improve open62541. There are ways to begin contributing without deep knowledge of the OPC UA standard:
Compile the examples with the single-file distribution open62541.h/.c
header and source file.
Using the GCC compiler, just run gcc -std=c99 <server.c> open62541.c -o server
(under Windows you may need to add -lws2_32
).
#include <signal.h>
#include "open62541.h"
UA_Boolean running = true;
void signalHandler(int sig) {
running = false;
}
int main(int argc, char** argv)
{
signal(SIGINT, signalHandler); /* catch ctrl-c */
/* Create a server listening on port 4840 */
UA_ServerConfig *config = UA_ServerConfig_new_default();
UA_Server *server = UA_Server_new(config);
/* Add a variable node */
/* 1) Define the node attributes */
UA_VariableAttributes attr = UA_VariableAttributes_default;
attr.displayName = UA_LOCALIZEDTEXT("en-US", "the answer");
UA_Int32 myInteger = 42;
UA_Variant_setScalar(&attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
/* 2) Define where the node shall be added with which browsename */
UA_NodeId newNodeId = UA_NODEID_STRING(1, "the.answer");
UA_NodeId parentNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
UA_NodeId parentReferenceNodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
UA_NodeId variableType = UA_NODEID_NULL; /* take the default variable type */
UA_QualifiedName browseName = UA_QUALIFIEDNAME(1, "the answer");
/* 3) Add the node */
UA_Server_addVariableNode(server, newNodeId, parentNodeId, parentReferenceNodeId,
browseName, variableType, attr, NULL, NULL);
/* Run the server loop */
UA_StatusCode status = UA_Server_run(server, &running);
UA_Server_delete(server);
UA_ServerConfig_delete(config);
return status;
}
#include <stdio.h>
#include "open62541.h"
int main(int argc, char *argv[])
{
/* Create a client and connect */
UA_Client *client = UA_Client_new(UA_ClientConfig_default);
UA_StatusCode status = UA_Client_connect(client, "opc.tcp://localhost:4840");
if(status != UA_STATUSCODE_GOOD) {
UA_Client_delete(client);
return status;
}
/* Read the value attribute of the node. UA_Client_readValueAttribute is a
* wrapper for the raw read service available as UA_Client_Service_read. */
UA_Variant value; /* Variants can hold scalar values and arrays of any type */
UA_Variant_init(&value);
status = UA_Client_readValueAttribute(client, UA_NODEID_STRING(1, "the.answer"), &value);
if(status == UA_STATUSCODE_GOOD &&
UA_Variant_hasScalarType(&value, &UA_TYPES[UA_TYPES_INT32])) {
printf("the value is: %i\n", *(UA_Int32*)value.data);
}
/* Clean up */
UA_Variant_deleteMembers(&value);
UA_Client_delete(client); /* Disconnects the client internally */
return status;
}