LwIP_UDP_Echo_Server
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Outline
Includes
#include "main.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include <string.h>
#include <stdio.h>
Private define
#define UDP_SERVER_PORT
#define UDP_CLIENT_PORT
Private function prototypes
udp_echoserver_init()
udp_echoserver_receive_callback(void *, struct udp_pcb *, struct pbuf *, const ip_addr_t *, u16_t)
Files
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SourceVuSTM32 Libraries and SamplesLwIP_UDP_Echo_ServerSrc/udp_echoserver.c
 
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/** ****************************************************************************** * @file LwIP/LwIP_UDP_Echo_Server/Src/udp_echoserver.c * @author MCD Application Team * @brief UDP echo server ****************************************************************************** * @attention * * Copyright (c) 2017 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** *//* ... */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "lwip/pbuf.h" #include "lwip/udp.h" #include "lwip/tcp.h" #include <string.h> #include <stdio.h> 6 includes Includes/* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ #define UDP_SERVER_PORT 7 /* define the UDP local connection port */ #define UDP_CLIENT_PORT 7 /* define the UDP remote connection port */ Private define /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ void udp_echoserver_receive_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port); Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Initialize the server application. * @param None * @retval None *//* ... */ void udp_echoserver_init(void) { struct udp_pcb *upcb; err_t err; /* Create a new UDP control block */ upcb = udp_new(); if (upcb) { /* Bind the upcb to the UDP_PORT port */ /* Using IP_ADDR_ANY allow the upcb to be used by any local interface */ err = udp_bind(upcb, IP_ADDR_ANY, UDP_SERVER_PORT); if(err == ERR_OK) { /* Set a receive callback for the upcb */ udp_recv(upcb, udp_echoserver_receive_callback, NULL); }if (err == ERR_OK) { ... } }if (upcb) { ... } }{ ... } /** * @brief This function is called when an UDP datagrm has been received on the port UDP_PORT. * @param arg user supplied argument (udp_pcb.recv_arg) * @param pcb the udp_pcb which received data * @param p the packet buffer that was received * @param addr the remote IP address from which the packet was received * @param port the remote port from which the packet was received * @retval None *//* ... */ void udp_echoserver_receive_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) { /* Connect to the remote client */ udp_connect(upcb, addr, UDP_CLIENT_PORT); /* Tell the client that we have accepted it */ udp_send(upcb, p); /* free the UDP connection, so we can accept new clients */ udp_disconnect(upcb); /* Free the p buffer */ pbuf_free(p); }{ ... }
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