Is there already a version of mbeddr.platform that is compatible with MPS 2021.3?...

If not, when can we expect one?

We build mbeddr against MPS 2021.3 release branch to run tests and ensure MPS changes do not break mbeddr: https://teamcity.jetbrains.com/viewType.html?buildTypeId=MPS_20213_Distribution_TestMbeddrBuild There’s mps/2021.3 branch in mbeddr repository we use for these build. Last week we updated the branch to reflect mbeddr master state (which is MPS 2021.2 now). We don’t publish artifacts for the build, our goal is to run tests. Guess, we can modify TC configuration to expose build artifacts, although that would create confusion whether it’s an official mbeddr build. One can build mbeddr artifacts from command line, by using respective MPS and MPS-extensions builds, it’s a gradle script with basically 2 parameters to modify (namely, location for MPS and MPS-extensions). MPS-extensions artifact is available at our TC server.