{
  "msg": "fourbar unified simulate RRRR",
  "req_code": "CASE_FB_UNIFIED_RRRR",
  "req_from": "wasm_test",
  "req_cmd": "Cmd_FourBar_Simulate",
  "req_param": {
    "mechanismType": "RRRR",
    "L1": 1.0,
    "L2": 3.0,
    "L3": 2.5,
    "L4": 3.5,
    "startAngleDeg": 0.0,
    "endAngleDeg": 180.0,
    "duration": 1.0,
    "stepTime": 0.25
  }
}