Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
raw.h
00001 /* 00002 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without modification, 00006 * are permitted provided that the following conditions are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright notice, 00011 * this list of conditions and the following disclaimer in the documentation 00012 * and/or other materials provided with the distribution. 00013 * 3. The name of the author may not be used to endorse or promote products 00014 * derived from this software without specific prior written permission. 00015 * 00016 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00017 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00018 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00019 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00020 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00021 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00022 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00023 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00024 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00025 * OF SUCH DAMAGE. 00026 * 00027 * This file is part of the lwIP TCP/IP stack. 00028 * 00029 * Author: Adam Dunkels <adam@sics.se> 00030 * 00031 */ 00032 #ifndef __LWIP_RAW_H__ 00033 #define __LWIP_RAW_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #if LWIP_RAW /* don't build if not configured for use in lwipopts.h */ 00038 00039 #include "lwip/pbuf.h" 00040 #include "lwip/inet.h" 00041 #include "lwip/ip.h" 00042 #include "lwip/ip_addr.h" 00043 00044 #ifdef __cplusplus 00045 extern "C" { 00046 #endif 00047 00048 struct raw_pcb { 00049 /* Common members of all PCB types */ 00050 IP_PCB; 00051 00052 struct raw_pcb *next; 00053 00054 u8_t protocol; 00055 00056 /* receive callback function 00057 * @param arg user supplied argument (raw_pcb.recv_arg) 00058 * @param pcb the raw_pcb which received data 00059 * @param p the packet buffer that was received 00060 * @param addr the remote IP address from which the packet was received 00061 * @return 1 if the packet was 'eaten' (aka. deleted), 00062 * 0 if the packet lives on 00063 * If returning 1, the callback is responsible for freeing the pbuf 00064 * if it's not used any more. 00065 */ 00066 u8_t (* recv)(void *arg, struct raw_pcb *pcb, struct pbuf *p, 00067 struct ip_addr *addr); 00068 /* user-supplied argument for the recv callback */ 00069 void *recv_arg; 00070 }; 00071 00072 /* The following functions is the application layer interface to the 00073 RAW code. */ 00074 struct raw_pcb * raw_new (u8_t proto); 00075 void raw_remove (struct raw_pcb *pcb); 00076 err_t raw_bind (struct raw_pcb *pcb, struct ip_addr *ipaddr); 00077 err_t raw_connect (struct raw_pcb *pcb, struct ip_addr *ipaddr); 00078 00079 void raw_recv (struct raw_pcb *pcb, 00080 u8_t (* recv)(void *arg, struct raw_pcb *pcb, 00081 struct pbuf *p, 00082 struct ip_addr *addr), 00083 void *recv_arg); 00084 err_t raw_sendto (struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr); 00085 err_t raw_send (struct raw_pcb *pcb, struct pbuf *p); 00086 00087 /* The following functions are the lower layer interface to RAW. */ 00088 u8_t raw_input (struct pbuf *p, struct netif *inp); 00089 #define raw_init() /* Compatibility define, not init needed. */ 00090 00091 #ifdef __cplusplus 00092 } 00093 #endif 00094 00095 #endif /* LWIP_RAW */ 00096 00097 #endif /* __LWIP_RAW_H__ */
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