设备升级参数

{
    "confirmation_topic": "string",
    "message_id": 0,
    "message_uuid": "string",
    "request_type": "string",
    "data": {
        "cmd_type": "string",
        "data": {
            "app_version": "string",
            "created_at": "string",
            "description": "string",
            "device_app_uuid": "string",
            "device_type": 0,
            "download_url": "string",
            "enabled": true,
            "is_newest": true,
            "issue_at": "string",
            "package_md5": "string",
            "package_name": "string",
            "package_size": 0
        }
    }
}