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.
LwipNetIf.cpp
00001 00002 /* 00003 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) 00004 00005 Permission is hereby granted, free of charge, to any person obtaining a copy 00006 of this software and associated documentation files (the "Software"), to deal 00007 in the Software without restriction, including without limitation the rights 00008 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00009 copies of the Software, and to permit persons to whom the Software is 00010 furnished to do so, subject to the following conditions: 00011 00012 The above copyright notice and this permission notice shall be included in 00013 all copies or substantial portions of the Software. 00014 00015 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00016 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00017 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00018 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00019 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00020 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00021 THE SOFTWARE. 00022 */ 00023 00024 #include "LwipNetIf.h" 00025 #include "lwip/init.h" 00026 #include "lwip/tcp_impl.h" 00027 #include "lwip/dns.h" 00028 00029 #include "netCfg.h" 00030 #if NET_LWIP_STACK 00031 00032 //See doc/rawapi.txt for details 00033 00034 LwipNetIf::LwipNetIf() : NetIf(), m_tcpTicker(), m_dnsTicker(), m_init(false) 00035 { 00036 00037 } 00038 00039 00040 LwipNetIf::~LwipNetIf() 00041 { 00042 m_tcpTicker.detach(); 00043 m_dnsTicker.detach(); 00044 } 00045 00046 void LwipNetIf::init() 00047 { 00048 if(m_init) 00049 return; 00050 m_init=true; 00051 lwip_init(); //init lwip, see init.c for details 00052 00053 //Setup Clocks 00054 m_tcpTicker.attach_us( tcp_tmr, TCP_TMR_INTERVAL * 1000 ); //TCP_TMR_INTERVAL = 250 ms in tcp_impl.h 00055 m_dnsTicker.attach_us( dns_tmr, DNS_TMR_INTERVAL * 1000 ); //DNS_TMR_INTERVAL = 1000 ms in dns.h 00056 } 00057 00058 NetTcpSocket* LwipNetIf::tcpSocket() //Create a new tcp socket 00059 { 00060 return new LwipNetTcpSocket(); 00061 } 00062 00063 NetUdpSocket* LwipNetIf::udpSocket() //Create a new udp socket 00064 { 00065 return new LwipNetUdpSocket(); 00066 } 00067 00068 NetDnsRequest* LwipNetIf::dnsRequest(const char* hostname) //Create a new NetDnsRequest object 00069 { 00070 return new LwipNetDnsRequest(hostname); 00071 } 00072 00073 NetDnsRequest* LwipNetIf::dnsRequest(Host* pHost) //Create a new NetDnsRequest object 00074 { 00075 return new LwipNetDnsRequest(pHost); 00076 } 00077 00078 void LwipNetIf::poll() 00079 { 00080 //Do some stuff... 00081 } 00082 00083 #endif
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