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\subsection{Variable step size configuration example}\label{sec:var-step-config-example}

The variable stepsize calculator is selected and configured in a JSON config file. This file is posted to the COE with the initialize command (see Section~\ref{sec:initcmd}). An example JSON config file follows.

\begin{json}
{
    "fmus":[
        "{MassAFMU}":"src/test/resources/varsteptest/VarStepSolverTest_FMUs_MassA",
        "{MassBFMU}":"src/test/resources/varsteptest/VarStepSolverTest_FMUs_MassB",
        "{SineFMU}":"src/test/resources/varsteptest/VarStepSolverTest_FMUs_Sine",
        "{SinkFMU}":"src/test/resources/varsteptest/VarStepSolverTest_FMUs_Sink"
    ],
    "connections":{
        "{MassAFMU}.massA.QA":[
            "{MassBFMU}.massB.QA",
            "{SinkFMU}.sink.QA"
        ],
        "{SineFMU}.sine.EXTSIG":[
            "{MassBFMU}.massB.EXTSIG",
            "{SinkFMU}.sink.EXTSIG"
        ],
        "{MassBFMU}.massB.TB":[
            "{MassAFMU}.massA.TB",
            "{SinkFMU}.sink.TB"
        ],
        "{MassAFMU}.massA.TB_used":[
            "{SinkFMU}.sink.TB_used"
        ]
    },
    "parameters":{
        "{MassBFMU}.massB.B.C":15000.0,
        "{MassAFMU}.massA.A.C":120000.0
    },
    "algorithm":{
        "type":"var-step",
        "size":[
            1E-6,
            1.0
        ],
        "initsize":1E-4,
        "constraints":{
            "zc":{
                "type":"zerocrossing",
                "ports":[
                    "{SineFMU}.sine.EXTSIG"
                ],
                "order":2,
                "abstol":1.0,
                "safety":0.0,
            },
            "bd":{
                "type":"boundeddifference",
                "ports":[
                    "{MassBFMU}.massB.TB",
                    "{MassAFMU}.massA.TB_used"
                ],
                "abstol":1.0,
                "reltol":1.0,
                "safety":0.0,
            },
            "sr":{
                "type":"samplingrate",
                "base":-1,
                "rate":10,
                "startTime":15
            }        
        }   
    }
} 
\end{json}