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.
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 ip_addr_t *addr; 00046 u16_t port; 00047 #if LWIP_NETBUF_RECVINFO 00048 ip_addr_t *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 err_t netbuf_data (struct netbuf *buf, 00064 void **dataptr, u16_t *len); 00065 s8_t netbuf_next (struct netbuf *buf); 00066 void netbuf_first (struct netbuf *buf); 00067 00068 00069 #define netbuf_copy_partial(buf, dataptr, len, offset) \ 00070 pbuf_copy_partial((buf)->p, (dataptr), (len), (offset)) 00071 #define netbuf_copy(buf,dataptr,len) netbuf_copy_partial(buf, dataptr, len, 0) 00072 #define netbuf_take(buf, dataptr, len) pbuf_take((buf)->p, dataptr, len) 00073 #define netbuf_len(buf) ((buf)->p->tot_len) 00074 #define netbuf_fromaddr(buf) ((buf)->addr) 00075 #define netbuf_fromport(buf) ((buf)->port) 00076 #if LWIP_NETBUF_RECVINFO 00077 #define netbuf_destaddr(buf) ((buf)->toaddr) 00078 #define netbuf_destport(buf) ((buf)->toport) 00079 #endif /* LWIP_NETBUF_RECVINFO */ 00080 00081 #ifdef __cplusplus 00082 } 00083 #endif 00084 00085 #endif /* __LWIP_NETBUF_H__ */
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