UDP
[Base Protocols]

Collaboration diagram for UDP:

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Detailed Description

RFC 768 user datagram protocol.

UDP only provides checksumming of data and multiplexing by port number. Therefore, an application program must deal directly with end-to-end communication problems like retransmission, flow control etc., if required.

Applications should call the UDP Socket API when using this protocol.

Functions
void	NutUdpInput (NETBUF *nb, ureg_t bcast)
	Handle incoming UDP packets.
int	NutUdpOutput (UDPSOCKET *sock, u_long daddr, u_short port, NETBUF *nb)
	Send a UDP packet.

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Function Documentation

void NutUdpInput (  NETBUF *  nb, ureg_t  bcast )

Handle incoming UDP packets. Note: This routine is called by the IP layer on incoming UDP packets. Applications typically do not call this function. Parameters: nb  Network buffer structure containing the UDP packet. bcast  Broadcast flag.

int NutUdpOutput (  UDPSOCKET *  sock, u_long  daddr, u_short  port, NETBUF *  nb )

Send a UDP packet. Parameters: sock  Socket descriptor. This pointer must have been retrieved by calling NutUdpCreateSocket(). daddr  IP address of the remote host in network byte order. port  Remote port number in host byte order. nb  Network buffer structure containing the datagram. This buffer will be released if the function returns an error. Note: Applications typically do not call this function but use the UDP socket interface. Returns: 0 on success, -1 otherwise.

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