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tcp.h File Reference
`#include "lwip/opt.h"`
`#include "lwip/tcpbase.h"`
`#include "lwip/mem.h"`
`#include "lwip/pbuf.h"`
`#include "lwip/ip.h"`
`#include "lwip/icmp.h"`
`#include "lwip/err.h"`
`#include "lwip/ip6.h"`
`#include "lwip/ip6_addr.h"`

## Data Structures

struct | tcp_ext_arg_callbacks
struct | tcp_pcb_listen
struct | tcp_pcb

## Macros

#define | TCP_PCB_COMMON(type)

## Typedefs

typedef err_t(* | tcp_accept_fn) (void *arg, struct tcp_pcb *newpcb, err_t err)
typedef err_t(* | tcp_recv_fn) (void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)
typedef err_t(* | tcp_sent_fn) (void *arg, struct tcp_pcb *tpcb, u16_t len)
typedef err_t(* | tcp_poll_fn) (void *arg, struct tcp_pcb *tpcb)
typedef void(* | tcp_err_fn) (void *arg, err_t err)
typedef err_t(* | tcp_connected_fn) (void *arg, struct tcp_pcb *tpcb, err_t err)
typedef void(* | tcp_extarg_callback_pcb_destroyed_fn) (u8_t id, void *data)
typedef err_t(* | tcp_extarg_callback_passive_open_fn) (u8_t id, struct tcp_pcb_listen *lpcb, struct tcp_pcb *cpcb)

## Functions

struct tcp_pcb * | tcp_new (void)
struct tcp_pcb * | tcp_new_ip_type (u8_t type)
void | tcp_arg (struct tcp_pcb *pcb, void *arg)
void | tcp_recv (struct tcp_pcb *pcb, tcp_recv_fn recv)
void | tcp_sent (struct tcp_pcb *pcb, tcp_sent_fn sent)
void | tcp_err (struct tcp_pcb *pcb, tcp_err_fn err)
void | tcp_accept (struct tcp_pcb *pcb, tcp_accept_fn accept)
void | tcp_poll (struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
void | tcp_recved (struct tcp_pcb *pcb, u16_t len)
err_t | tcp_bind (struct tcp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
void | tcp_bind_netif (struct tcp_pcb *pcb, const struct netif *netif)
err_t | tcp_connect (struct tcp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port, tcp_connected_fn connected)
struct tcp_pcb * | tcp_listen_with_backlog_and_err (struct tcp_pcb *pcb, u8_t backlog, err_t *err)
struct tcp_pcb * | tcp_listen_with_backlog (struct tcp_pcb *pcb, u8_t backlog)
void | tcp_abort (struct tcp_pcb *pcb)
err_t | tcp_close (struct tcp_pcb *pcb)
err_t | tcp_shutdown (struct tcp_pcb *pcb, int shut_rx, int shut_tx)
err_t | tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len, u8_t apiflags)
void | tcp_setprio (struct tcp_pcb *pcb, u8_t prio)
err_t | tcp_output (struct tcp_pcb *pcb)
u8_t | tcp_ext_arg_alloc_id (void)
void | tcp_ext_arg_set_callbacks (struct tcp_pcb *pcb, u8_t id, const struct tcp_ext_arg_callbacks *const callbacks)
void | tcp_ext_arg_set (struct tcp_pcb *pcb, u8_t id, void *arg)
void * | tcp_ext_arg_get (const struct tcp_pcb *pcb, u8_t id)

## Detailed Description

TCP API (to be used from TCPIP thread)
See also TCP

## Macro Definition Documentation

## TCP_PCB_COMMON

#define TCP_PCB_COMMON | ( |  | type | ) |

Value:
type *next; /* for the linked list */ \
void *callback_arg; \
TCP_PCB_EXTARGS \
enum tcp_state state; /* TCP state */ \
u8_t prio; \
/* ports are in host byte order */ \
u16_t local_port

members common to struct tcp_pcb and struct tcp_listen_pcb

## Typedef Documentation

## tcp_accept_fn

typedef err_t(* tcp_accept_fn) (void *arg, struct tcp_pcb *newpcb, err_t err)

Function prototype for tcp accept callback functions. Called when a new connection can be accepted on a listening pcb.

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  newpcb | The new connection pcb
  err | An error code if there has been an error accepting. Only return ERR_ABRT if you have called tcp_abort from within the callback function!

## tcp_connected_fn

typedef err_t(* tcp_connected_fn) (void *arg, struct tcp_pcb *tpcb, err_t err)

Function prototype for tcp connected callback functions. Called when a pcb is connected to the remote side after initiating a connection attempt by calling tcp_connect().

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  tpcb | The connection pcb which is connected
  err | An unused error code, always ERR_OK currently ;-)

Note
  When a connection attempt fails, the error callback is currently called!

## tcp_err_fn

typedef void(* tcp_err_fn) (void *arg, err_t err)

Function prototype for tcp error callback functions. Called when the pcb receives a RST or is unexpectedly closed for any other reason.

Note
  The corresponding pcb is already freed when this callback is called!

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  err | Error code to indicate why the pcb has been closed ERR_ABRT: aborted through tcp_abort or by a TCP timer ERR_RST: the connection was reset by the remote host

## tcp_extarg_callback_passive_open_fn

typedef err_t(* tcp_extarg_callback_passive_open_fn) (u8_t id, struct tcp_pcb_listen *lpcb, struct tcp_pcb *cpcb)

Function prototype to transition arguments from a listening pcb to an accepted pcb

Parameters

  id | ext arg id (allocated via tcp_ext_arg_alloc_id)
  lpcb | the listening pcb accepting a connection
  cpcb | the newly allocated connection pcb

Returns
  ERR_OK if OK, any error if connection should be dropped

## tcp_extarg_callback_pcb_destroyed_fn

typedef void(* tcp_extarg_callback_pcb_destroyed_fn) (u8_t id, void *data)

Function prototype for deallocation of arguments. Called just before the pcb is freed, so don't expect to be able to do anything with this pcb!

Parameters

  id | ext arg id (allocated via tcp_ext_arg_alloc_id)
  data | pointer to the data (set via tcp_ext_arg_set before)

## tcp_poll_fn

typedef err_t(* tcp_poll_fn) (void *arg, struct tcp_pcb *tpcb)

Function prototype for tcp poll callback functions. Called periodically as specified by

See also
  tcp_poll.

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  tpcb | tcp pcb

Returns
  ERR_OK: try to send some data by calling tcp_output Only return ERR_ABRT if you have called tcp_abort from within the callback function!

## tcp_recv_fn

typedef err_t(* tcp_recv_fn) (void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err)

Function prototype for tcp receive callback functions. Called when data has been received.

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  tpcb | The connection pcb which received data
  p | The received data (or NULL when the connection has been closed!)
  err | An error code if there has been an error receiving Only return ERR_ABRT if you have called tcp_abort from within the callback function!

## tcp_sent_fn

typedef err_t(* tcp_sent_fn) (void *arg, struct tcp_pcb *tpcb, u16_t len)

Function prototype for tcp sent callback functions. Called when sent data has been acknowledged by the remote side. Use it to free corresponding resources. This also means that the pcb has now space available to send new data.

Parameters

  arg | Additional argument to pass to the callback function (

See also
  tcp_arg())

Parameters

  tpcb | The connection pcb for which data has been acknowledged
  len | The amount of bytes acknowledged

Returns
  ERR_OK: try to send some data by calling tcp_output Only return ERR_ABRT if you have called tcp_abort from within the callback function!