Issues with non-integer --output-interval in ModelExchange simulation of a Buildings FMU

[casella]

Hi,

we encountered a weird problem while testing OMC-generated FMUs of the Buildings library with FMPy. Steps to reproduce:

• get the development version of Buildings library from https://github.com/lbl-srg/modelica-buildings/
• get the latest OMC nightly build
• export Buildings.Airflow.Multizone.Validation.ThreeRoomsContamDiscretizedDoor as FMU-ME
• run

python3 -m fmpy simulate  --output-file ThreeRoomsContamDiscretizedDoor_res.csv --start-time 0 --stop-time 3600 --timeout 50 --relative-tolerance 1e-06 --solver CVode  --interface-type ModelExchange --output-interval 5 ThreeRoomsContamDiscretizedDoor.fmu

the simulation runs successfully until time = 3600 and produces a simulation result file. This also works fine if you set --output-interval 10.

However, if you set --output-interval 7.2 or --output.interval 5.7, the simulation hangs somewhere before stopTime and eventually a partial result file is issued.

This is quite weird, maybe it's a problem with our installation, but if you can reproduce it, it would be nice to have it fixed. Keeping @deepak19015 and @AndreaBartolini in the loop.

Thanks!