Initial SR implementation for pure OPC-UA coupler in C.

slapos/software/osie-coupler/software-c.cfg

+[buildout] 
+parts = 
+  open62541
+
+extends =   
+  https://lab.nexedi.com/nexedi/slapos/raw/master/stack/slapos.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/component/cmake/buildout.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/component/git/buildout.cfg
+  https://lab.nexedi.com/nexedi/slapos/raw/master/component/python3/buildout.cfg
+
+# we need to have bootstrap Python for buildout in Python3 due to
+# https://bugs.kde.org/show_bug.cgi?id=344802
+[python]
+part = python3
+
+[open62541-source]
+recipe = slapos.recipe.build:gitclone
+repository = https://github.com/open62541/open62541.git
+branch = master
+revision = 465e8c47
+git-executable = ${git:location}/bin/git
+
+[open62541]
+recipe = slapos.recipe.cmmi
+path = ${open62541-source:location}
+configure-command =
+  ${git:location}/bin/git submodule update --init --recursive
+  ${cmake:location}/bin/cmake
+configure-options =
+  -DBUILD_SHARED_LIBS=ON
+  -DCMAKE_BUILD_TYPE=RelWithDebInfo
+  -DCMAKE_INSTALL_PREFIX=@@LOCATION@@
+  -DUA_ENABLE_PUBSUB=ON
+  -DUA_ENABLE_PUBSUB_MONITORING=ON
+  -DUA_NAMESPACE_ZERO=REDUCED
+