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.
memp.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 00033 #ifndef __LWIP_MEMP_H__ 00034 #define __LWIP_MEMP_H__ 00035 00036 #include "lwip/opt.h" 00037 00038 #ifdef __cplusplus 00039 extern "C" { 00040 #endif 00041 00042 /* Create the list of all memory pools managed by memp. MEMP_MAX represents a NULL pool at the end */ 00043 typedef enum { 00044 #define LWIP_MEMPOOL(name,num,size,desc) MEMP_##name, 00045 #include "lwip/memp_std.h" 00046 MEMP_MAX 00047 } memp_t; 00048 00049 #if MEM_USE_POOLS 00050 /* Use a helper type to get the start and end of the user "memory pools" for mem_malloc */ 00051 typedef enum { 00052 /* Get the first (via: 00053 MEMP_POOL_HELPER_START = ((u8_t) 1*MEMP_POOL_A + 0*MEMP_POOL_B + 0*MEMP_POOL_C + 0)*/ 00054 MEMP_POOL_HELPER_FIRST = ((u8_t) 00055 #define LWIP_MEMPOOL(name,num,size,desc) 00056 #define LWIP_MALLOC_MEMPOOL_START 1 00057 #define LWIP_MALLOC_MEMPOOL(num, size) * MEMP_POOL_##size + 0 00058 #define LWIP_MALLOC_MEMPOOL_END 00059 #include "lwip/memp_std.h" 00060 ) , 00061 /* Get the last (via: 00062 MEMP_POOL_HELPER_END = ((u8_t) 0 + MEMP_POOL_A*0 + MEMP_POOL_B*0 + MEMP_POOL_C*1) */ 00063 MEMP_POOL_HELPER_LAST = ((u8_t) 00064 #define LWIP_MEMPOOL(name,num,size,desc) 00065 #define LWIP_MALLOC_MEMPOOL_START 00066 #define LWIP_MALLOC_MEMPOOL(num, size) 0 + MEMP_POOL_##size * 00067 #define LWIP_MALLOC_MEMPOOL_END 1 00068 #include "lwip/memp_std.h" 00069 ) 00070 } memp_pool_helper_t; 00071 00072 /* The actual start and stop values are here (cast them over) 00073 We use this helper type and these defines so we can avoid using const memp_t values */ 00074 #define MEMP_POOL_FIRST ((memp_t) MEMP_POOL_HELPER_FIRST) 00075 #define MEMP_POOL_LAST ((memp_t) MEMP_POOL_HELPER_LAST) 00076 #endif /* MEM_USE_POOLS */ 00077 00078 #if MEMP_MEM_MALLOC || MEM_USE_POOLS 00079 extern const u16_t memp_sizes[MEMP_MAX]; 00080 #endif /* MEMP_MEM_MALLOC || MEM_USE_POOLS */ 00081 00082 #if MEMP_MEM_MALLOC 00083 00084 #include "mem.h" 00085 00086 #define memp_init() 00087 #define memp_malloc(type) mem_malloc(memp_sizes[type]) 00088 #define memp_free(type, mem) mem_free(mem) 00089 00090 #else /* MEMP_MEM_MALLOC */ 00091 00092 #if MEM_USE_POOLS 00093 /** This structure is used to save the pool one element came from. */ 00094 struct memp_malloc_helper 00095 { 00096 memp_t poolnr; 00097 }; 00098 #endif /* MEM_USE_POOLS */ 00099 00100 void memp_init(void); 00101 00102 #if MEMP_OVERFLOW_CHECK 00103 void *memp_malloc_fn(memp_t type, const char* file, const int line); 00104 #define memp_malloc(t) memp_malloc_fn((t), __FILE__, __LINE__) 00105 #else 00106 void *memp_malloc(memp_t type); 00107 #endif 00108 void memp_free(memp_t type, void *mem); 00109 00110 #endif /* MEMP_MEM_MALLOC */ 00111 00112 #ifdef __cplusplus 00113 } 00114 #endif 00115 00116 #endif /* __LWIP_MEMP_H__ */
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