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README: Update.

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Mentalflow 2024-03-14 09:46:11 +08:00
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@ -173,10 +173,11 @@ sequenceDiagram
|:----:|:----:|:----:|
| head | 2 | 包头，数值固定为`0xAAAF` |
| length | 2 | 长度，包括包头 |
| data | 可变长度 | 数据最大不超过（8191 - `BASE_FRAME_PREFIX_LEN` - `CRYPTO_ZDATA_FRAME_PREFIX_LEN`）= 8173 |
| crc | 2 | CRC16校验码,对解密数据进行CRC校验后数值与该码不同，将被判定为解密失败 |
| data | 可变长度 | 数据最大不超过（8191 - `BASE_FRAME_PREFIX_LEN` - `CRYPTO_ZDATA_FRAME_PREFIX_LEN`）= 8171 |
另有其他说明如下：
+ 宏定义`CRYPTO_ZDATA_FRAME_PREFIX_LEN`：对称加密数据帧帧头长度，固定为4Bytes
+ 宏定义`CRYPTO_ZDATA_FRAME_PREFIX_LEN`：对称加密数据帧帧头长度，固定为6Bytes
+ 宏定义`CRYPTO_ZDATA_FRAME_HEAD`：对称加密数据帧帧头，固定为`0xAAAF`
### 4.7 设备信息存储（device）
协议采用`device`结构体用作存储相关通讯数据。