recvfrom(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port)参数分别是什么

recvfrom(uint8_t sn, uint8_t *buf, uint16_t len, uint8_t *addr, uint16_t *port)函数的参数分别为：
- sn: 一个uint8_t类型的参数，表示套接字号
- buf: 一个指向uint8_t的指针，用于存储接收到的数据
- len: 一个uint16_t类型的参数，表示buf的长度
- addr: 一个指向uint8_t的指针，用于存储发送方的IP地址
- port: 一个指向uint16_t的指针，用于存储发送方的端口号 <span class="em">1</span><span class="em">2</span><span class="em">3</span>
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