Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
api_msg.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_API_MSG_H__ 00033 #define __LWIP_API_MSG_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */ 00038 00039 #include <stddef.h> /* for size_t */ 00040 00041 #include "lwip/ip_addr.h" 00042 #include "lwip/err.h" 00043 #include "lwip/sys.h" 00044 #include "lwip/igmp.h" 00045 #include "lwip/api.h" 00046 00047 #ifdef __cplusplus 00048 extern "C" { 00049 #endif 00050 00051 /* IP addresses and port numbers are expected to be in 00052 * the same byte order as in the corresponding pcb. 00053 */ 00054 /** This struct includes everything that is necessary to execute a function 00055 for a netconn in another thread context (mainly used to process netconns 00056 in the tcpip_thread context to be thread safe). */ 00057 struct api_msg_msg { 00058 /** The netconn which to process - always needed: it includes the semaphore 00059 which is used to block the application thread until the function finished. */ 00060 struct netconn *conn; 00061 /** Depending on the executed function, one of these union members is used */ 00062 union { 00063 /** used for do_send */ 00064 struct netbuf *b; 00065 /** used for do_newconn */ 00066 struct { 00067 u8_t proto; 00068 } n; 00069 /** used for do_bind and do_connect */ 00070 struct { 00071 struct ip_addr *ipaddr; 00072 u16_t port; 00073 } bc; 00074 /** used for do_getaddr */ 00075 struct { 00076 struct ip_addr *ipaddr; 00077 u16_t *port; 00078 u8_t local; 00079 } ad; 00080 /** used for do_write */ 00081 struct { 00082 const void *dataptr; 00083 size_t len; 00084 u8_t apiflags; 00085 } w; 00086 /** used for do_recv */ 00087 struct { 00088 u16_t len; 00089 } r; 00090 #if LWIP_IGMP 00091 /** used for do_join_leave_group */ 00092 struct { 00093 struct ip_addr *multiaddr; 00094 struct ip_addr *interface; 00095 enum netconn_igmp join_or_leave; 00096 } jl; 00097 #endif /* LWIP_IGMP */ 00098 #if TCP_LISTEN_BACKLOG 00099 struct { 00100 u8_t backlog; 00101 } lb; 00102 #endif /* TCP_LISTEN_BACKLOG */ 00103 } msg; 00104 }; 00105 00106 /** This struct contains a function to execute in another thread context and 00107 a struct api_msg_msg that serves as an argument for this function. 00108 This is passed to tcpip_apimsg to execute functions in tcpip_thread context. */ 00109 struct api_msg { 00110 /** function to execute in tcpip_thread context */ 00111 void (* function)(struct api_msg_msg *msg); 00112 /** arguments for this function */ 00113 struct api_msg_msg msg; 00114 }; 00115 00116 #if LWIP_DNS 00117 /** As do_gethostbyname requires more arguments but doesn't require a netconn, 00118 it has its own struct (to avoid struct api_msg getting bigger than necessary). 00119 do_gethostbyname must be called using tcpip_callback instead of tcpip_apimsg 00120 (see netconn_gethostbyname). */ 00121 struct dns_api_msg { 00122 /** Hostname to query or dotted IP address string */ 00123 const char *name; 00124 /** Rhe resolved address is stored here */ 00125 struct ip_addr *addr; 00126 /** This semaphore is posted when the name is resolved, the application thread 00127 should wait on it. */ 00128 sys_sem_t sem; 00129 /** Errors are given back here */ 00130 err_t *err; 00131 }; 00132 #endif /* LWIP_DNS */ 00133 00134 void do_newconn ( struct api_msg_msg *msg); 00135 void do_delconn ( struct api_msg_msg *msg); 00136 void do_bind ( struct api_msg_msg *msg); 00137 void do_connect ( struct api_msg_msg *msg); 00138 void do_disconnect ( struct api_msg_msg *msg); 00139 void do_listen ( struct api_msg_msg *msg); 00140 void do_send ( struct api_msg_msg *msg); 00141 void do_recv ( struct api_msg_msg *msg); 00142 void do_write ( struct api_msg_msg *msg); 00143 void do_getaddr ( struct api_msg_msg *msg); 00144 void do_close ( struct api_msg_msg *msg); 00145 #if LWIP_IGMP 00146 void do_join_leave_group( struct api_msg_msg *msg); 00147 #endif /* LWIP_IGMP */ 00148 00149 #if LWIP_DNS 00150 void do_gethostbyname(void *arg); 00151 #endif /* LWIP_DNS */ 00152 00153 struct netconn* netconn_alloc(enum netconn_type t, netconn_callback callback); 00154 void netconn_free(struct netconn *conn); 00155 00156 #ifdef __cplusplus 00157 } 00158 #endif 00159 00160 #endif /* LWIP_NETCONN */ 00161 00162 #endif /* __LWIP_API_MSG_H__ */
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