/api/get

 {
        "param": [
          "sntp_enable",
          "sntp_server",
          "sntp_timeout",
          "sntp_period",
          "dev_sn",
          "test_wr_param"
        ]
      }

 {
      "status": {
        "sntp_timeout": "undefined",
        "test_wr_param": "access_denied"
      },
      "value": {
        "sntp_enable":"no",
        "sntp_server": "ntp.cesnet.cz",
        "sntp_period": 2,
        "dev_sn": "00000013"
      }
    }