Example program with HTTPServer and sensor data streaming over TCPSockets, using Donatien Garnier's Net APIs and services code on top of LWIP. Files StreamServer.h and .cpp encapsulate streaming over TCPSockets. Broadcast is done by sendToAll(), and all incoming data is echoed back to the client. Echo code can be replaced with some remote control of the streaming interface. See main() that shows how to periodically send some data to all subscribed clients. To subscribe, a client should open a socket at <mbed_ip> port 123. I used few lines in TCL code to set up a quick sink for the data. HTTP files are served on port 80 concurrently to the streaming.
ip.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_IP_H__ 00033 #define __LWIP_IP_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #include "lwip/def.h" 00038 #include "lwip/pbuf.h" 00039 #include "lwip/ip_addr.h" 00040 #include "lwip/err.h" 00041 #include "lwip/netif.h" 00042 00043 #ifdef __cplusplus 00044 extern "C" { 00045 #endif 00046 00047 /** Currently, the function ip_output_if_opt() is only used with IGMP */ 00048 #define IP_OPTIONS_SEND LWIP_IGMP 00049 00050 #define IP_HLEN 20 00051 00052 #define IP_PROTO_ICMP 1 00053 #define IP_PROTO_IGMP 2 00054 #define IP_PROTO_UDP 17 00055 #define IP_PROTO_UDPLITE 136 00056 #define IP_PROTO_TCP 6 00057 00058 /* This is passed as the destination address to ip_output_if (not 00059 to ip_output), meaning that an IP header already is constructed 00060 in the pbuf. This is used when TCP retransmits. */ 00061 #ifdef IP_HDRINCL 00062 #undef IP_HDRINCL 00063 #endif /* IP_HDRINCL */ 00064 #define IP_HDRINCL NULL 00065 00066 #if LWIP_NETIF_HWADDRHINT 00067 #define IP_PCB_ADDRHINT ;u8_t addr_hint 00068 #else 00069 #define IP_PCB_ADDRHINT 00070 #endif /* LWIP_NETIF_HWADDRHINT */ 00071 00072 /* This is the common part of all PCB types. It needs to be at the 00073 beginning of a PCB type definition. It is located here so that 00074 changes to this common part are made in one location instead of 00075 having to change all PCB structs. */ 00076 #define IP_PCB \ 00077 /* ip addresses in network byte order */ \ 00078 ip_addr_t local_ip; \ 00079 ip_addr_t remote_ip; \ 00080 /* Socket options */ \ 00081 u16_t so_options; \ 00082 /* Type Of Service */ \ 00083 u8_t tos; \ 00084 /* Time To Live */ \ 00085 u8_t ttl \ 00086 /* link layer address resolution hint */ \ 00087 IP_PCB_ADDRHINT 00088 00089 struct ip_pcb { 00090 /* Common members of all PCB types */ 00091 IP_PCB; 00092 }; 00093 00094 /* 00095 * Option flags per-socket. These are the same like SO_XXX. 00096 */ 00097 #define SOF_DEBUG (u16_t)0x0001U /* turn on debugging info recording */ 00098 #define SOF_ACCEPTCONN (u16_t)0x0002U /* socket has had listen() */ 00099 #define SOF_REUSEADDR (u16_t)0x0004U /* allow local address reuse */ 00100 #define SOF_KEEPALIVE (u16_t)0x0008U /* keep connections alive */ 00101 #define SOF_DONTROUTE (u16_t)0x0010U /* just use interface addresses */ 00102 #define SOF_BROADCAST (u16_t)0x0020U /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */ 00103 #define SOF_USELOOPBACK (u16_t)0x0040U /* bypass hardware when possible */ 00104 #define SOF_LINGER (u16_t)0x0080U /* linger on close if data present */ 00105 #define SOF_OOBINLINE (u16_t)0x0100U /* leave received OOB data in line */ 00106 #define SOF_REUSEPORT (u16_t)0x0200U /* allow local address & port reuse */ 00107 00108 00109 #ifdef PACK_STRUCT_USE_INCLUDES 00110 # include "arch/bpstruct.h" 00111 #endif 00112 PACK_STRUCT_BEGIN 00113 struct ip_hdr { 00114 /* version / header length / type of service */ 00115 PACK_STRUCT_FIELD(u16_t _v_hl_tos); 00116 /* total length */ 00117 PACK_STRUCT_FIELD(u16_t _len); 00118 /* identification */ 00119 PACK_STRUCT_FIELD(u16_t _id); 00120 /* fragment offset field */ 00121 PACK_STRUCT_FIELD(u16_t _offset); 00122 #define IP_RF 0x8000 /* reserved fragment flag */ 00123 #define IP_DF 0x4000 /* dont fragment flag */ 00124 #define IP_MF 0x2000 /* more fragments flag */ 00125 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 00126 /* time to live */ 00127 PACK_STRUCT_FIELD(u8_t _ttl); 00128 /* protocol*/ 00129 PACK_STRUCT_FIELD(u8_t _proto); 00130 /* checksum */ 00131 PACK_STRUCT_FIELD(u16_t _chksum); 00132 /* source and destination IP addresses */ 00133 PACK_STRUCT_FIELD(ip_addr_t src); 00134 PACK_STRUCT_FIELD(ip_addr_t dest); 00135 } PACK_STRUCT_STRUCT; 00136 PACK_STRUCT_END 00137 #ifdef PACK_STRUCT_USE_INCLUDES 00138 # include "arch/epstruct.h" 00139 #endif 00140 00141 #define IPH_V(hdr) (ntohs((hdr)->_v_hl_tos) >> 12) 00142 #define IPH_HL(hdr) ((ntohs((hdr)->_v_hl_tos) >> 8) & 0x0f) 00143 #define IPH_TOS(hdr) (ntohs((hdr)->_v_hl_tos) & 0xff) 00144 #define IPH_LEN(hdr) ((hdr)->_len) 00145 #define IPH_ID(hdr) ((hdr)->_id) 00146 #define IPH_OFFSET(hdr) ((hdr)->_offset) 00147 #define IPH_TTL(hdr) ((hdr)->_ttl) 00148 #define IPH_PROTO(hdr) ((hdr)->_proto) 00149 #define IPH_CHKSUM(hdr) ((hdr)->_chksum) 00150 00151 #define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos))) 00152 #define IPH_LEN_SET(hdr, len) (hdr)->_len = (len) 00153 #define IPH_ID_SET(hdr, id) (hdr)->_id = (id) 00154 #define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off) 00155 #define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl) 00156 #define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto) 00157 #define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum) 00158 00159 /** The interface that provided the packet for the current callback invocation. */ 00160 extern struct netif *current_netif; 00161 /** Header of the input packet currently being processed. */ 00162 extern const struct ip_hdr *current_header; 00163 00164 #define ip_init() /* Compatibility define, not init needed. */ 00165 struct netif *ip_route(ip_addr_t *dest); 00166 err_t ip_input(struct pbuf *p, struct netif *inp); 00167 err_t ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, 00168 u8_t ttl, u8_t tos, u8_t proto); 00169 err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, 00170 u8_t ttl, u8_t tos, u8_t proto, 00171 struct netif *netif); 00172 #if LWIP_NETIF_HWADDRHINT 00173 err_t ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, 00174 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint); 00175 #endif /* LWIP_NETIF_HWADDRHINT */ 00176 #if IP_OPTIONS_SEND 00177 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, 00178 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options, 00179 u16_t optlen); 00180 #endif /* IP_OPTIONS_SEND */ 00181 /** Get the interface that received the current packet. 00182 * This function must only be called from a receive callback (udp_recv, 00183 * raw_recv, tcp_accept). It will return NULL otherwise. */ 00184 #define ip_current_netif() (current_netif) 00185 /** Get the IP header of the current packet. 00186 * This function must only be called from a receive callback (udp_recv, 00187 * raw_recv, tcp_accept). It will return NULL otherwise. */ 00188 #define ip_current_header() (current_header) 00189 #if IP_DEBUG 00190 void ip_debug_print(struct pbuf *p); 00191 #else 00192 #define ip_debug_print(p) 00193 #endif /* IP_DEBUG */ 00194 00195 #ifdef __cplusplus 00196 } 00197 #endif 00198 00199 #endif /* __LWIP_IP_H__ */ 00200 00201
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