Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
netbuf.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_NETBUF_H__ 00033 #define __LWIP_NETBUF_H__ 00034 00035 #include "lwip/opt.h" 00036 #include "lwip/pbuf.h" 00037 #include "lwip/ip_addr.h" 00038 00039 #ifdef __cplusplus 00040 extern "C" { 00041 #endif 00042 00043 struct netbuf { 00044 struct pbuf *p, *ptr; 00045 struct ip_addr *addr; 00046 u16_t port; 00047 #if LWIP_NETBUF_RECVINFO 00048 struct ip_addr *toaddr; 00049 u16_t toport; 00050 #endif /* LWIP_NETBUF_RECVINFO */ 00051 }; 00052 00053 /* Network buffer functions: */ 00054 struct netbuf * netbuf_new (void); 00055 void netbuf_delete (struct netbuf *buf); 00056 void * netbuf_alloc (struct netbuf *buf, u16_t size); 00057 void netbuf_free (struct netbuf *buf); 00058 err_t netbuf_ref (struct netbuf *buf, 00059 const void *dataptr, u16_t size); 00060 void netbuf_chain (struct netbuf *head, 00061 struct netbuf *tail); 00062 00063 u16_t netbuf_len (struct netbuf *buf); 00064 err_t netbuf_data (struct netbuf *buf, 00065 void **dataptr, u16_t *len); 00066 s8_t netbuf_next (struct netbuf *buf); 00067 void netbuf_first (struct netbuf *buf); 00068 00069 00070 #define netbuf_copy_partial(buf, dataptr, len, offset) \ 00071 pbuf_copy_partial((buf)->p, (dataptr), (len), (offset)) 00072 #define netbuf_copy(buf,dataptr,len) netbuf_copy_partial(buf, dataptr, len, 0) 00073 #define netbuf_take(buf, dataptr, len) pbuf_take((buf)->p, dataptr, len) 00074 #define netbuf_len(buf) ((buf)->p->tot_len) 00075 #define netbuf_fromaddr(buf) ((buf)->addr) 00076 #define netbuf_fromport(buf) ((buf)->port) 00077 #if LWIP_NETBUF_RECVINFO 00078 #define netbuf_destaddr(buf) ((buf)->toaddr) 00079 #define netbuf_destport(buf) ((buf)->toport) 00080 #endif /* LWIP_NETBUF_RECVINFO */ 00081 00082 #ifdef __cplusplus 00083 } 00084 #endif 00085 00086 #endif /* __LWIP_NETBUF_H__ */
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