{
  "msg": "fourbar valid",
  "req_code": "CASE_FB_001",
  "req_from": "wasm_test",
  "req_cmd": "Cmd_FourBar_CrankSlider",
  "req_param": {
    "L_AB": 0.5,
    "L_BS": 2.0,
    "S_OFS": 0.0,
    "angleDeg": 45.0
  }
}