Open Source C++ OPC-UA Server and Client Library

LGPL OPC-UA server and client library written in C++ and with a lot of code auto-generated from xml specification using python.

Python bindings can be found in the python directory.

code: https://github.com/FreeOpcUa/freeopcua
website: http://freeopcua.github.io/
mailing list: https://groups.google.com/forum/#!forum/freeopcua

Currently supported:

read, write, browse
translateBrowsePathToNodeId
DataChange Events
Events
Subscriptions
complete opc-ua address space generated from xml specification
Method call from client

Work in progress

StatusChange Events
Filtering
Documentation
Windows port
Automatic generation of binary protocol from OPC schema files

Not implemented yet (patches are welcome)

Methods on server side
History
Security: Authentication, Certificates handling, ..

##Usage

Documentation is sparse but several examples are availables:

C++ examples in https://github.com/FreeOpcUa/freeopcua/tree/master/src/examples
Python examples in https://github.com/FreeOpcUa/freeopcua/tree/master/python/src
https://github.com/FreeOpcUa/freeopcua/blob/master/python/tests/test_highlevel.py can also be a usefull source of information

Example minimal client in python

  client = opcua.Client(False)
  client.connect("opc.tcp://10.10.10.4:4841/OPCUA/AnyServer/")

  objects = client.get_objects_node()
  print("Children of objects are: ", objects.get_children())

  var = objects.get_child(["3:AnObject", "AVariable"])
  print("Value of variable is: ", var.get_value())
  
  client.disconnect()

Tested clients and servers with default settings

uaexperts client application
node-opcua (client and server tested)
ignition server
Beckhoff PLC (seems to be some issues, but mostly working)
ignition open-source sdk (server tested)
quickopc client sdk
prosysopc demo client
prosysopc demo server
unified automation sdk (client and server tested)

##Installation

An environment supporting c++11 is necessary: gcc-4.8+, clang 3.4 or VS2013

Ubuntu (Debians)

There is a script debian.soft in the root for installing all required soft to build all repositories.

Using GNU autotools

autoreconf -f -i
./configure --prefix=/path/to/server
make 
make check
make install
cd /path/to/server
LD_LIBRARY_PATH=./lib ./bin/opcuaserver

Using cmake

Linux

mkdir build
cd build
cmake ..
make
make test

Windows

Boost and libxml2 are necessary

rem compiling
mkdir build
cd build
cmake .. -DBOOST_ROOT=c:\boost_1_56
cmake --build
ctest -C Debug
cd bin\Debug
example_server.exe

Developement

C++ style

2 spaces not tab
CamelCase
local variables start with small letter
gobal/member variables starts with capital letters.

python code and API should follows PEP8 (many places should be fixed)

Address space and most protocol code are auto-generated and should not be modified directly. Every auto-generated file starts with a mention that it should not be edited. There's a lot of old hand written protocol code left that should use the auto-generated code. This is done by uncommenting struct names in schemas/generate_protocol.py and removing old code and files in src/protocol and include/opc/ua/protocol/

DeppChen/freeopcua