{
  "msg": "fourbar invalid",
  "req_code": "CASE_FB_002",
  "req_from": "wasm_test",
  "req_cmd": "Cmd_FourBar_CrankSlider",
  "req_param": {
    "L_AB": 0.0,
    "L_BS": 0.2,
    "S_OFS": 0.5,
    "angleDeg": 30.0
  }
}