协议作用:用于机箱设备心跳功能
返回示例:(返回JSON格式字符串,实际返回结果以服务器为标准)
{"data": {"id":"123456","lastDownloadDate":1415933424000,"ltdCode":"123456","parkCode":"123456","returnJson":null,"creat eDate":null,"macCode":"123456"},"status":true,"code":"02","msg":"操作成功(有数据)"}