proxy-fmu is a tool-independent solution for running FMUs compatible with FMI for Co-simulation version 1.x & 2.x in distributed fashion. proxy-fmu will automatically spawn a new process for each instance that is instantiated from an FMU.

By default, proxy-fmu targets localhost. For this behaviour zero configuration is required apart from the fact that the proxyfmu executable must be available. It is also possible to make proxy-fmu run instances on a remote computer. For this to work, the proxyfmu-booter executable must be started on the remote computer and provided with a valid port.

In short, this solution allows you to:

• Import FMI 1.0 models in software that otherwise only supports FMI 2.0.
• Instantiate multiple instances of FMUs that only allows one instance per process.
• The ability to run the FMU on some remote resource
  • Which in turn allows FMUs to run on otherwise unsupported platforms.

The solution is written in C++ and the static library and bundled executables have no dependencies.

Currently, only Windows and Linux are supported, but there are no known obstacles for supporting the Darwin platform.

Building proxy-fmu is straightforward, however, conan is a hard requirement:

pip install conan

For an example on how to build the project using the command line, refer to the CI setup.

proxy-fmu is hosted by the conan remote https://osp.jfrog.io/artifactory/api/conan/conan-local

Add the remote using the command:

conan remote add osp https://osp.jfrog.io/artifactory/api/conan/conan-local

Then add a dependency to: proxyfmu/<version>@osp/stable

The artifact contains both the library and required executables.

Adding proxy_fmu support for libcosim is as simple as adding -o proxyfmu=True to its conan command.

This library serves similar purpose as FMU-proxy v.0.6.2. However, it requires no JVM and automatically spawns new processes. The current development of FMU-proxy is about wrapping existing FMUs into new FMUs with network capabilities, so they now serve different purposes. proxy-fmu is a library that apps can integrate with and FMU-proxy produces FMI compatible wrapper models.