一个用于处理十六进制字符串的JavaScript库，支持十六进制字符串与字节数组的快速转换，适用于串口通信、蓝牙通信等底层通信场景。
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一些底层通信场景下，例如串口通信、蓝牙通信等，经常用到二进制协议进行通信，使用 hexstr 可以快速地转换十六进制字符串与字节数组，方便处理、发送数据。项目地址：https://github.com/sq800/hexstr
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