v5.7.1 更新：
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> UDP 组件更新：
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1、增加新组件：UDP Node
1) UDP Node 没有“连接”的概念，可以与任意地址相互收发数据
2) UDP Node 支持三种运行模式：单播、组播和广播
3) 增加 UDP Node 组件示例 Demo ‘TestUDPNode’

> 其它更新：
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1、所有组件增加 Wait() 方法，用于等待组件关闭
2、所有通信组件增加 SetReuseAddressPolicy() 方法，支持设置地址重用策略
3、所有 SSL 通信组件增加 SetSSLCipherList() 方法，支持设置 SSL 加密套件
4、大量 API 更新，代码重构、优化

升级说明：
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1、HP-Socket v5.7.1 改动或删除了一些旧版本的 API，升级时请参考 Chang-APIs.txt

Linux更新：

> UDP Update
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1. Add new component: UDP Nod:
1) UDP Node has no concept of “connection”, and can send and receive data with any address.
2) UDP Node supports three execution modes: unicast, multicast, and broadcast.
3) Add UDP Node component demo ‘hp-testecho-udp-node’.

> Other Update
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1. Added ‘Wait()’ method for all components to wait for components to close.
2. Added ‘SetReuseAddressPolicy()’ method for all communication components to support setting address reuse policy.
3. Added ‘SetSSLCipherList()’ method for all SSL communication components to support setting SSL cipher suites.
4. Extensive API updates, code refactoring and optimization.

> Update instructions
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1. HP-Socket v5.7.1 has changed or deleted some old APIs, please refer to ‘Chang-APIs.txt’ when upgrading.