Is there a way for me to get stop_time and step_size and then use it in my fmu class(e.g. do_stop)?

[MengnanLi91]

I wonder if I can get stop_time and step_size and use it in my fmu? I can get start_time from setup_experiment as shown below, but the stop_time and step_size is not allowed and throw out error fmpy.fmi1.FMICallException: fmi2DoStep failed with status 4 (fatal).

class MooseSlave(Fmi2Slave):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs, logging_add_standard_categories=False)

        self.control = MooseControl(moose_port=40000)

        self.moose_time = 0
        self.time = 0.0

        self.register_variable(Real("moose_time", causality=Fmi2Causality.output, variability=Fmi2Variability.continuous))
        self.register_variable(Real("time", causality=Fmi2Causality.output, variability=Fmi2Variability.continuous))


        self.default_experiment = DefaultExperiment(
        start_time=0.0,    # simulation begins at t=0 s
        stop_time=3.0,    # simulation ends at t=10 s
        step_size=0.5     # fixed time‐step, can not be adjusted after fmu is built
        )

        self.sim_start_time = None
        self.sim_stop_time = None


    def setup_experiment(self,
                         start_time: float,
                         tolerance:  float = None,
                         stop_time:  float = None) -> bool:

        self.sim_start_time = start_time
        self.sim_stop_time = stop_time ## this line doesn't work and will give me error

        return True


    def do_step(self,
                current_time: float,
                step_size:    float) -> bool:

## This is the logic I want to achieve with start_time and stop_time, since I control MOOSE simulation via FMU, I need to sync my FMU time with MOOSE simulation time.

        if current_time == self.sim_start_time:
            self.control.initialize()
        
        moose_time = self.control.getPostprocessor('t')
        
        if moose_time >= self.sim_stop_time:
              return False

        return True

This is how I run it:

    result = simulate_fmu(
        "MooseSlave.fmu",
        start_time=0.0,
        stop_time=T_end,
        output      = ['time','moose_time', 'diffused']
    )

[markaren]

stop_time and tolerance is actually not passed to the Python environment.

PythonFMU/pythonfmu/pythonfmu-export/src/pythonfmu/PySlaveInstance.cpp

Line 227 in 43d059d

void SetupExperiment(double startTime, std::optional<double> stop, std::optional<double> tolerance) override

I suppose they should. It's an easy fix.

[markaren]

See #246