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Update README.md
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README.md

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| 标识 | 长度(位) | 说明 |
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|----|----|----|
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| 魔术字 | 16 | 0x1234 |
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| 包类型 | 4 | 1-15 |
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| 魔术字 | 24 | “iot” |
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| 包含数据 | 1 | 0-1 |
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| 数据格式 | 3 | 0-7 |
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| [数据长度] | 20 | 0- 1MB |
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| 包类型 | 4 | 1-15 |
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| [事务序号] | 16 | 0-65535 |
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| [数据长度] | 16 | 0-64KB |
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### 包类型
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| 类型 | id | 说明 |
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|----|----|----|
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| - | 0 | 无效 |
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| CONNECT | 1 | 连接 |
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| CONNECT_ACK | 2 | 连接响应 |
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| CONNACK | 2 | 连接响应 |
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| HEARTBEAT | 3 | 心跳 |
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| PING | 4 | ping |
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| PONG | 5 | ping响应 |
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| REQUEST | 6 | 请求 |
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| RESPONSE | 7 | 响应 |
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| STREAM | 8 | 数据流 |
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| STREAM_END | 9 | 数据流结束 |
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| | 10 | |
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| | 14 | |
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| PUBLISH | 10 | 广播 |
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| PUBACK | 11 | 广播响应 |
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| SUBSCRIBE | 12 | 订阅 |
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| SUBACK | 13 | 订阅响应 |
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| UNSUBSCRIBE | 14 | 取消订阅 |
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| DISCONNECT | 15 | 断开连接 |
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### 数据格式

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