{
  "msg": "fourbar unified simulate RPRR",
  "req_code": "CASE_FB_UNIFIED_RPRR",
  "req_from": "wasm_test",
  "req_cmd": "Cmd_FourBar_Simulate",
  "req_param": {
    "mechanismType": "RPRR",
    "OA": 1.0,
    "AB": 3.0,
    "OC": 3.0,
    "startAngleDeg": 0.0,
    "endAngleDeg": 180.0,
    "duration": 1.0,
    "stepTime": 0.25
  }
}