I'm attempting to learn how to use OPC with OM (specifically OPC-UA). From the forums, I've gleaned:

1) Compile with omc, not OMEdit because OMEdit doesn't support OPC yet.
2) When running the compiled simulation, use `-embeddedServer=opc-ua -rt=1`
3) Perhaps you should also use the option, `-clock=RT`

From the official documentation (OpenModelicaSystem.pdf section 6.3.3) I've learned that:
1) OPC isn't supported in the official release of OM and needs to be manually merged in, "To utilize either of the OPC interfaces, the OPC branch needs to be merged to c_runtime."
2) You must modify the generated makefile to include the OPC libraries, "UA Server is linked to the simulation executable by adding -lOPCregistry -lua_server at the end of the compiling script."

From my own experimentation, I've found that:
1) The compiled simulation will give you no errors if you get these options wrong, i.e. a typo such as `-embleddedSerber=opc-uae` won't give an error
2) The instructions in OpenModelicaSystem.pdf section 6.3.3 are wrong. There are no OPCregistry and ua_server libraries. The only library available to be linked in is omopcua (libomopcua.dll in C:\OpenModelica1.11.0-32bit\lib\omc)

I'm guessing that the section on OPC in the official system documentation (under Users->User Documentation) on the OpenModelica web site is out of date (since it references a version built 3 years ago). Is the up-to-date system documentation in another location?