UDP

GNRC’s implementation of the UDP protocol.

int gnrc_udp_calc_csum(include/net/gnrc/pkt.h::gnrc_pktsnip_t * hdr, include/net/gnrc/pkt.h::gnrc_pktsnip_t * pseudo_hdr)

Calculate the checksum for the given packet.

Parameters

hdr:Pointer to the UDP header pseudo_hdr:Pointer to the network layer header

Return values

• 0 on success
• -EBADMSG if hdr is not of type GNRC_NETTYPE_UDP
• -EFAULT if hdr or pseudo_hdr is NULL
• -ENOENT if include/net/gnrc/pkt.h::gnrc_pktsnip::type of pseudo_hdr is not known

include/net/gnrc/pkt.h::gnrc_pktsnip_t * gnrc_udp_hdr_build(include/net/gnrc/pkt.h::gnrc_pktsnip_t * payload, uint16_t src, uint16_t dst)

Allocate and initialize a fresh UDP header in the packet buffer.

Parameters

payload:Payload contained in the UDP packet src:Source port in host byte order dst:Destination port in host byte order

Return values

• pointer to the newly created (and allocated) header
• NULL on src == NULL, dst == NULL, src_len != 2, dst_len != 2 or on allocation error

int gnrc_udp_init(void)

Initialize and start UDP.

Return values

• PID of the UDP thread
• negative value on error

GNRC_UDP_MSG_QUEUE_SIZE

Default message queue size for the UDP thread.

(8U)

GNRC_UDP_PRIO

Priority of the UDP thread.

(THREAD_PRIORITY_MAIN - 2)

GNRC_UDP_STACK_SIZE

Default stack size to use for the UDP thread.

(THREAD_STACKSIZE_DEFAULT)