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NTP RFC 5905 / SNTP 协议解码器
解码 48 字节 NTP/SNTP 数据包，解析闰秒、层级、时间戳等字段
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1b 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e9 8b 1a 00 00 00 00 00
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