Ilya I
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.
Diff: lwip/netif/ppp/randm.h
- Revision:
- 0:e614f7875b60
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/lwip/netif/ppp/randm.h Sat Jun 12 06:01:50 2010 +0000 @@ -0,0 +1,81 @@ +/***************************************************************************** +* randm.h - Random number generator header file. +* +* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. +* Copyright (c) 1998 Global Election Systems Inc. +* +* The authors hereby grant permission to use, copy, modify, distribute, +* and license this software and its documentation for any purpose, provided +* that existing copyright notices are retained in all copies and that this +* notice and the following disclaimer are included verbatim in any +* distributions. No written agreement, license, or royalty fee is required +* for any of the authorized uses. +* +* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR +* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +* +****************************************************************************** +* REVISION HISTORY +* +* 03-01-01 Marc Boucher <marc@mbsi.ca> +* Ported to lwIP. +* 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc. +* Extracted from avos. +*****************************************************************************/ + +#ifndef RANDM_H +#define RANDM_H + +/*********************** +*** PUBLIC FUNCTIONS *** +***********************/ +/* + * Initialize the random number generator. + */ +void avRandomInit(void); + +/* + * Churn the randomness pool on a random event. Call this early and often + * on random and semi-random system events to build randomness in time for + * usage. For randomly timed events, pass a null pointer and a zero length + * and this will use the system timer and other sources to add randomness. + * If new random data is available, pass a pointer to that and it will be + * included. + */ +void avChurnRand(char *randData, u32_t randLen); + +/* + * Randomize our random seed value. To be called for truely random events + * such as user operations and network traffic. + */ +#if MD5_SUPPORT +#define avRandomize() avChurnRand(NULL, 0) +#else /* MD5_SUPPORT */ +void avRandomize(void); +#endif /* MD5_SUPPORT */ + +/* + * Use the random pool to generate random data. This degrades to pseudo + * random when used faster than randomness is supplied using churnRand(). + * Thus it's important to make sure that the results of this are not + * published directly because one could predict the next result to at + * least some degree. Also, it's important to get a good seed before + * the first use. + */ +void avGenRand(char *buf, u32_t bufLen); + +/* + * Return a new random number. + */ +u32_t avRandom(void); + + +#endif /* RANDM_H */