Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
ip_addr.c
00001 /** 00002 * @file 00003 * This is the IPv4 address tools implementation. 00004 * 00005 */ 00006 00007 /* 00008 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00009 * All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without modification, 00012 * are permitted provided that the following conditions are met: 00013 * 00014 * 1. Redistributions of source code must retain the above copyright notice, 00015 * this list of conditions and the following disclaimer. 00016 * 2. Redistributions in binary form must reproduce the above copyright notice, 00017 * this list of conditions and the following disclaimer in the documentation 00018 * and/or other materials provided with the distribution. 00019 * 3. The name of the author may not be used to endorse or promote products 00020 * derived from this software without specific prior written permission. 00021 * 00022 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00023 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00024 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00025 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00026 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00027 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00028 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00029 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00030 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00031 * OF SUCH DAMAGE. 00032 * 00033 * This file is part of the lwIP TCP/IP stack. 00034 * 00035 * Author: Adam Dunkels <adam@sics.se> 00036 * 00037 */ 00038 00039 #include "lwip/opt.h" 00040 #include "lwip/ip_addr.h" 00041 #include "lwip/inet.h" 00042 #include "lwip/netif.h" 00043 00044 #define IP_ADDR_ANY_VALUE 0x00000000UL 00045 #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL 00046 00047 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */ 00048 const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE }; 00049 const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE }; 00050 00051 /** 00052 * Determine if an address is a broadcast address on a network interface 00053 * 00054 * @param addr address to be checked 00055 * @param netif the network interface against which the address is checked 00056 * @return returns non-zero if the address is a broadcast address 00057 */ 00058 u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif) 00059 { 00060 u32_t addr2test; 00061 00062 addr2test = addr->addr; 00063 /* all ones (broadcast) or all zeroes (old skool broadcast) */ 00064 if ((~addr2test == IP_ADDR_ANY_VALUE) || 00065 (addr2test == IP_ADDR_ANY_VALUE)) 00066 return 1; 00067 /* no broadcast support on this network interface? */ 00068 else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) 00069 /* the given address cannot be a broadcast address 00070 * nor can we check against any broadcast addresses */ 00071 return 0; 00072 /* address matches network interface address exactly? => no broadcast */ 00073 else if (addr2test == netif->ip_addr.addr) 00074 return 0; 00075 /* on the same (sub) network... */ 00076 else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask)) 00077 /* ...and host identifier bits are all ones? =>... */ 00078 && ((addr2test & ~netif->netmask.addr) == 00079 (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr))) 00080 /* => network broadcast address */ 00081 return 1; 00082 else 00083 return 0; 00084 }
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