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@brief define function of socket API
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extern uint8 socket(SOCKET s, uint8 protocol, uint16 port, uint8 flag); // Opens a socket(TCP or UDP or IP_RAW mode)
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extern void close(SOCKET s); // Close socket
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extern uint8 connect(SOCKET s, uint8 * addr, uint16 port); // Establish TCP connection (Active connection)
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extern void disconnect(SOCKET s); // disconnect the connection
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extern uint8 listen(SOCKET s); // Establish TCP connection (Passive connection)
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extern uint16 send(SOCKET s, const uint8 * buf, uint16 len); // Send data (TCP)
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extern uint16 recv(SOCKET s, uint8 * buf, uint16 len); // Receive data (TCP)
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extern uint16 sendto(SOCKET s, const uint8 * buf, uint16 len, uint8 * addr, uint16 port); // Send data (UDP/IP RAW)
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extern uint16 recvfrom(SOCKET s, uint8 * buf, uint16 len, uint8 * addr, uint16 *port); // Receive data (UDP/IP RAW)
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extern uint16 igmpsend(SOCKET s, const uint8 * buf, uint16 len);