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.
if/lwip/lwipNetUdpSocket.cpp@1:3ee499525aa5, 2010-06-14 (annotated)
- Committer:
- iva2k
- Date:
- Mon Jun 14 03:24:33 2010 +0000
- Revision:
- 1:3ee499525aa5
- Parent:
- 0:e614f7875b60
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| iva2k | 0:e614f7875b60 | 1 | |
| iva2k | 0:e614f7875b60 | 2 | /* |
| iva2k | 0:e614f7875b60 | 3 | Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) |
| iva2k | 0:e614f7875b60 | 4 | |
| iva2k | 0:e614f7875b60 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy |
| iva2k | 0:e614f7875b60 | 6 | of this software and associated documentation files (the "Software"), to deal |
| iva2k | 0:e614f7875b60 | 7 | in the Software without restriction, including without limitation the rights |
| iva2k | 0:e614f7875b60 | 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| iva2k | 0:e614f7875b60 | 9 | copies of the Software, and to permit persons to whom the Software is |
| iva2k | 0:e614f7875b60 | 10 | furnished to do so, subject to the following conditions: |
| iva2k | 0:e614f7875b60 | 11 | |
| iva2k | 0:e614f7875b60 | 12 | The above copyright notice and this permission notice shall be included in |
| iva2k | 0:e614f7875b60 | 13 | all copies or substantial portions of the Software. |
| iva2k | 0:e614f7875b60 | 14 | |
| iva2k | 0:e614f7875b60 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| iva2k | 0:e614f7875b60 | 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| iva2k | 0:e614f7875b60 | 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| iva2k | 0:e614f7875b60 | 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| iva2k | 0:e614f7875b60 | 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| iva2k | 0:e614f7875b60 | 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| iva2k | 0:e614f7875b60 | 21 | THE SOFTWARE. |
| iva2k | 0:e614f7875b60 | 22 | */ |
| iva2k | 0:e614f7875b60 | 23 | |
| iva2k | 0:e614f7875b60 | 24 | #include "lwipNetUdpSocket.h" |
| iva2k | 0:e614f7875b60 | 25 | #include "lwip/udp.h" |
| iva2k | 0:e614f7875b60 | 26 | |
| iva2k | 0:e614f7875b60 | 27 | //#define __DEBUG |
| iva2k | 0:e614f7875b60 | 28 | #include "dbg/dbg.h" |
| iva2k | 0:e614f7875b60 | 29 | |
| iva2k | 0:e614f7875b60 | 30 | #include "netCfg.h" |
| iva2k | 0:e614f7875b60 | 31 | #if NET_LWIP_STACK |
| iva2k | 0:e614f7875b60 | 32 | |
| iva2k | 0:e614f7875b60 | 33 | LwipNetUdpSocket::LwipNetUdpSocket(udp_pcb* pPcb /*= NULL*/) : m_pPcb(pPcb), m_lInPkt() //Passes a pcb if already created (by an accept req for instance), in that case transfers ownership |
| iva2k | 0:e614f7875b60 | 34 | { |
| iva2k | 1:3ee499525aa5 | 35 | DBG("New NetUdpSocket %p\r\n", (void*)this); |
| iva2k | 0:e614f7875b60 | 36 | if(!m_pPcb) |
| iva2k | 0:e614f7875b60 | 37 | m_pPcb = udp_new(); |
| iva2k | 0:e614f7875b60 | 38 | if(m_pPcb) |
| iva2k | 0:e614f7875b60 | 39 | { |
| iva2k | 0:e614f7875b60 | 40 | //Setup callback |
| iva2k | 0:e614f7875b60 | 41 | // udp_recv( (udp_pcb*) m_pPcb, LwipNetUdpSocket::sRecvCb, (void*) this ); |
| iva2k | 0:e614f7875b60 | 42 | } |
| iva2k | 0:e614f7875b60 | 43 | } |
| iva2k | 0:e614f7875b60 | 44 | |
| iva2k | 0:e614f7875b60 | 45 | LwipNetUdpSocket::~LwipNetUdpSocket() |
| iva2k | 0:e614f7875b60 | 46 | { |
| iva2k | 0:e614f7875b60 | 47 | close(); |
| iva2k | 0:e614f7875b60 | 48 | } |
| iva2k | 0:e614f7875b60 | 49 | |
| iva2k | 0:e614f7875b60 | 50 | NetUdpSocketErr LwipNetUdpSocket::bind(const Host& me) |
| iva2k | 0:e614f7875b60 | 51 | { |
| iva2k | 0:e614f7875b60 | 52 | if(!m_pPcb) |
| iva2k | 0:e614f7875b60 | 53 | return NETUDPSOCKET_MEM; //NetUdpSocket was not properly initialised, should destroy it & retry |
| iva2k | 0:e614f7875b60 | 54 | |
| iva2k | 0:e614f7875b60 | 55 | /* err_t err = udp_bind( (udp_pcb*) m_pPcb, IP_ADDR_ANY, me.getPort()); //IP_ADDR_ANY : Bind the connection to all local addresses |
| iva2k | 0:e614f7875b60 | 56 | if(err) |
| iva2k | 0:e614f7875b60 | 57 | return NETUDPSOCKET_INUSE;*/ |
| iva2k | 0:e614f7875b60 | 58 | |
| iva2k | 0:e614f7875b60 | 59 | //Setup callback |
| iva2k | 0:e614f7875b60 | 60 | udp_recv( (udp_pcb*) m_pPcb, LwipNetUdpSocket::sRecvCb, (void*) this ); |
| iva2k | 0:e614f7875b60 | 61 | |
| iva2k | 0:e614f7875b60 | 62 | return NETUDPSOCKET_OK; |
| iva2k | 0:e614f7875b60 | 63 | } |
| iva2k | 0:e614f7875b60 | 64 | |
| iva2k | 0:e614f7875b60 | 65 | #define MAX(a,b) ((a>b)?a:b) |
| iva2k | 0:e614f7875b60 | 66 | #define MIN(a,b) ((a<b)?a:b) |
| iva2k | 0:e614f7875b60 | 67 | |
| iva2k | 0:e614f7875b60 | 68 | int /*if < 0 : NetUdpSocketErr*/ LwipNetUdpSocket::sendto(const char* buf, int len, Host* pHost) |
| iva2k | 0:e614f7875b60 | 69 | { |
| iva2k | 0:e614f7875b60 | 70 | if( !m_pPcb ) //Pcb doesn't exist (anymore) |
| iva2k | 0:e614f7875b60 | 71 | return NETUDPSOCKET_MEM; |
| iva2k | 0:e614f7875b60 | 72 | pbuf* p = pbuf_alloc(PBUF_RAW, len, PBUF_RAM); |
| iva2k | 0:e614f7875b60 | 73 | if( !p ) |
| iva2k | 0:e614f7875b60 | 74 | return NETUDPSOCKET_MEM; |
| iva2k | 0:e614f7875b60 | 75 | memcpy (p->payload, (void*)buf, len); |
| iva2k | 0:e614f7875b60 | 76 | //udp_connect( (udp_pcb*) m_pPcb, &(pHost->getIp().getStruct()), pHost->getPort() ); |
| iva2k | 0:e614f7875b60 | 77 | //err_t err = udp_send( (udp_pcb*) m_pPcb, p); |
| iva2k | 0:e614f7875b60 | 78 | err_t err = udp_sendto( (udp_pcb*) m_pPcb, p, &(pHost->getIp().getStruct()), pHost->getPort() ); |
| iva2k | 0:e614f7875b60 | 79 | pbuf_free( p ); |
| iva2k | 0:e614f7875b60 | 80 | if(err) |
| iva2k | 0:e614f7875b60 | 81 | return NETUDPSOCKET_SETUP; //Connection problem |
| iva2k | 1:3ee499525aa5 | 82 | DBG("%d bytes sent in UDP Socket.\r\n", len); |
| iva2k | 0:e614f7875b60 | 83 | return len; |
| iva2k | 0:e614f7875b60 | 84 | } |
| iva2k | 0:e614f7875b60 | 85 | |
| iva2k | 0:e614f7875b60 | 86 | int /*if < 0 : NetUdpSocketErr*/ LwipNetUdpSocket::recvfrom(char* buf, int len, Host* pHost) |
| iva2k | 0:e614f7875b60 | 87 | { |
| iva2k | 0:e614f7875b60 | 88 | if( !m_pPcb ) //Pcb doesn't exist (anymore) |
| iva2k | 0:e614f7875b60 | 89 | return NETUDPSOCKET_MEM; |
| iva2k | 0:e614f7875b60 | 90 | int inLen = 0; |
| iva2k | 0:e614f7875b60 | 91 | int cpyLen = 0; |
| iva2k | 0:e614f7875b60 | 92 | |
| iva2k | 0:e614f7875b60 | 93 | static int rmgLen = 0; |
| iva2k | 0:e614f7875b60 | 94 | //Contains the remaining len in this pbuf |
| iva2k | 0:e614f7875b60 | 95 | |
| iva2k | 0:e614f7875b60 | 96 | if( m_lInPkt.empty() ) |
| iva2k | 0:e614f7875b60 | 97 | return 0; |
| iva2k | 0:e614f7875b60 | 98 | |
| iva2k | 0:e614f7875b60 | 99 | pbuf* pBuf = (pbuf*) m_lInPkt.front().pBuf; |
| iva2k | 0:e614f7875b60 | 100 | |
| iva2k | 0:e614f7875b60 | 101 | if(pHost) |
| iva2k | 0:e614f7875b60 | 102 | *pHost = Host( IpAddr(&m_lInPkt.front().addr), m_lInPkt.front().port ); |
| iva2k | 0:e614f7875b60 | 103 | |
| iva2k | 0:e614f7875b60 | 104 | if( !pBuf ) |
| iva2k | 0:e614f7875b60 | 105 | { |
| iva2k | 0:e614f7875b60 | 106 | rmgLen = 0; |
| iva2k | 0:e614f7875b60 | 107 | return 0; |
| iva2k | 0:e614f7875b60 | 108 | } |
| iva2k | 0:e614f7875b60 | 109 | |
| iva2k | 0:e614f7875b60 | 110 | if ( !rmgLen ) //We did not know m_pReadPbuf->len last time we called this fn |
| iva2k | 0:e614f7875b60 | 111 | { |
| iva2k | 0:e614f7875b60 | 112 | rmgLen = pBuf->len; |
| iva2k | 0:e614f7875b60 | 113 | } |
| iva2k | 0:e614f7875b60 | 114 | |
| iva2k | 0:e614f7875b60 | 115 | while ( inLen < len ) |
| iva2k | 0:e614f7875b60 | 116 | { |
| iva2k | 0:e614f7875b60 | 117 | cpyLen = MIN( (len - inLen), rmgLen ); //Remaining len to copy, remaining len in THIS pbuf |
| iva2k | 0:e614f7875b60 | 118 | memcpy((void*)buf, (void*)((char*)(pBuf->payload) + (pBuf->len - rmgLen)), cpyLen); |
| iva2k | 0:e614f7875b60 | 119 | inLen += cpyLen; |
| iva2k | 0:e614f7875b60 | 120 | buf += cpyLen; |
| iva2k | 0:e614f7875b60 | 121 | |
| iva2k | 0:e614f7875b60 | 122 | rmgLen = rmgLen - cpyLen; //Update rmgLen |
| iva2k | 0:e614f7875b60 | 123 | |
| iva2k | 0:e614f7875b60 | 124 | if( rmgLen > 0 ) |
| iva2k | 0:e614f7875b60 | 125 | { |
| iva2k | 0:e614f7875b60 | 126 | //We did not read this pbuf completely, so let's save it's pos & return |
| iva2k | 0:e614f7875b60 | 127 | break; |
| iva2k | 0:e614f7875b60 | 128 | } |
| iva2k | 0:e614f7875b60 | 129 | |
| iva2k | 0:e614f7875b60 | 130 | if(pBuf->next) |
| iva2k | 0:e614f7875b60 | 131 | { |
| iva2k | 0:e614f7875b60 | 132 | pbuf* pNextPBuf = pBuf->next; |
| iva2k | 0:e614f7875b60 | 133 | pBuf->next = NULL; //So that it is not freed as well |
| iva2k | 0:e614f7875b60 | 134 | //We get the reference to pNextPBuf from m_pReadPbuf |
| iva2k | 0:e614f7875b60 | 135 | pbuf_free((pbuf*)pBuf); |
| iva2k | 0:e614f7875b60 | 136 | pBuf = pNextPBuf; |
| iva2k | 0:e614f7875b60 | 137 | rmgLen = pBuf->len; |
| iva2k | 0:e614f7875b60 | 138 | } |
| iva2k | 0:e614f7875b60 | 139 | else |
| iva2k | 0:e614f7875b60 | 140 | { |
| iva2k | 0:e614f7875b60 | 141 | pbuf_free((pbuf*)pBuf); |
| iva2k | 0:e614f7875b60 | 142 | pBuf = NULL; |
| iva2k | 0:e614f7875b60 | 143 | rmgLen = 0; |
| iva2k | 0:e614f7875b60 | 144 | m_lInPkt.pop_front(); |
| iva2k | 0:e614f7875b60 | 145 | break; //No more data to read |
| iva2k | 0:e614f7875b60 | 146 | } |
| iva2k | 0:e614f7875b60 | 147 | } |
| iva2k | 0:e614f7875b60 | 148 | |
| iva2k | 0:e614f7875b60 | 149 | return inLen; |
| iva2k | 0:e614f7875b60 | 150 | } |
| iva2k | 0:e614f7875b60 | 151 | |
| iva2k | 0:e614f7875b60 | 152 | NetUdpSocketErr LwipNetUdpSocket::close() |
| iva2k | 0:e614f7875b60 | 153 | { |
| iva2k | 1:3ee499525aa5 | 154 | //DBG("LwipNetUdpSocket::close() : Closing...\r\n"); |
| iva2k | 0:e614f7875b60 | 155 | |
| iva2k | 0:e614f7875b60 | 156 | if(m_closed) |
| iva2k | 0:e614f7875b60 | 157 | return NETUDPSOCKET_OK; //Already being closed |
| iva2k | 0:e614f7875b60 | 158 | m_closed = true; |
| iva2k | 0:e614f7875b60 | 159 | |
| iva2k | 0:e614f7875b60 | 160 | if( !m_pPcb ) //Pcb doesn't exist (anymore) |
| iva2k | 0:e614f7875b60 | 161 | return NETUDPSOCKET_MEM; |
| iva2k | 0:e614f7875b60 | 162 | |
| iva2k | 0:e614f7875b60 | 163 | //Cleanup incoming data |
| iva2k | 0:e614f7875b60 | 164 | cleanUp(); |
| iva2k | 0:e614f7875b60 | 165 | |
| iva2k | 0:e614f7875b60 | 166 | udp_remove( (udp_pcb*) m_pPcb); |
| iva2k | 0:e614f7875b60 | 167 | |
| iva2k | 0:e614f7875b60 | 168 | m_pPcb = NULL; |
| iva2k | 0:e614f7875b60 | 169 | return NETUDPSOCKET_OK; |
| iva2k | 0:e614f7875b60 | 170 | } |
| iva2k | 0:e614f7875b60 | 171 | |
| iva2k | 0:e614f7875b60 | 172 | NetUdpSocketErr LwipNetUdpSocket::poll() |
| iva2k | 0:e614f7875b60 | 173 | { |
| iva2k | 0:e614f7875b60 | 174 | NetUdpSocket::flushEvents(); |
| iva2k | 0:e614f7875b60 | 175 | return NETUDPSOCKET_OK; |
| iva2k | 0:e614f7875b60 | 176 | } |
| iva2k | 0:e614f7875b60 | 177 | |
| iva2k | 0:e614f7875b60 | 178 | // Callbacks events |
| iva2k | 0:e614f7875b60 | 179 | |
| iva2k | 0:e614f7875b60 | 180 | void LwipNetUdpSocket::recvCb(udp_pcb* pcb, struct pbuf* p, ip_addr_t* addr, u16_t port) |
| iva2k | 0:e614f7875b60 | 181 | { |
| iva2k | 1:3ee499525aa5 | 182 | DBG(" Packet of length %d arrived in UDP Socket.\r\n", p->tot_len); |
| iva2k | 0:e614f7875b60 | 183 | list<InPacket>::iterator it; |
| iva2k | 0:e614f7875b60 | 184 | for ( it = m_lInPkt.begin(); it != m_lInPkt.end(); it++ ) |
| iva2k | 0:e614f7875b60 | 185 | { |
| iva2k | 0:e614f7875b60 | 186 | if( ip_addr_cmp((&((*it).addr)), addr) && ((*it).port == port) ) |
| iva2k | 0:e614f7875b60 | 187 | { |
| iva2k | 0:e614f7875b60 | 188 | //Let's tail this packet to the previous one |
| iva2k | 0:e614f7875b60 | 189 | pbuf_cat((pbuf*)(*it).pBuf, p); |
| iva2k | 0:e614f7875b60 | 190 | //No need to queue an event in that case since the read buf has not been processed yet |
| iva2k | 0:e614f7875b60 | 191 | return; |
| iva2k | 0:e614f7875b60 | 192 | } |
| iva2k | 0:e614f7875b60 | 193 | } |
| iva2k | 0:e614f7875b60 | 194 | |
| iva2k | 0:e614f7875b60 | 195 | //New host, add a packet to the queue |
| iva2k | 0:e614f7875b60 | 196 | InPacket pkt; |
| iva2k | 0:e614f7875b60 | 197 | pkt.pBuf = p; |
| iva2k | 0:e614f7875b60 | 198 | pkt.addr = *addr; |
| iva2k | 0:e614f7875b60 | 199 | pkt.port = port; |
| iva2k | 0:e614f7875b60 | 200 | m_lInPkt.push_back(pkt); |
| iva2k | 0:e614f7875b60 | 201 | |
| iva2k | 0:e614f7875b60 | 202 | queueEvent(NETUDPSOCKET_READABLE); |
| iva2k | 0:e614f7875b60 | 203 | } |
| iva2k | 0:e614f7875b60 | 204 | |
| iva2k | 0:e614f7875b60 | 205 | void LwipNetUdpSocket::cleanUp() //Flush input buffer |
| iva2k | 0:e614f7875b60 | 206 | { |
| iva2k | 0:e614f7875b60 | 207 | list<InPacket>::iterator it; |
| iva2k | 0:e614f7875b60 | 208 | for ( it = m_lInPkt.begin(); it != m_lInPkt.end(); it++ ) |
| iva2k | 0:e614f7875b60 | 209 | { |
| iva2k | 0:e614f7875b60 | 210 | //Free buf |
| iva2k | 0:e614f7875b60 | 211 | pbuf_free((pbuf*)(*it).pBuf); |
| iva2k | 0:e614f7875b60 | 212 | } |
| iva2k | 0:e614f7875b60 | 213 | recvfrom(NULL, 0, NULL); |
| iva2k | 0:e614f7875b60 | 214 | m_lInPkt.clear(); |
| iva2k | 0:e614f7875b60 | 215 | } |
| iva2k | 0:e614f7875b60 | 216 | |
| iva2k | 0:e614f7875b60 | 217 | // Static callback from LwIp |
| iva2k | 0:e614f7875b60 | 218 | |
| iva2k | 0:e614f7875b60 | 219 | void LwipNetUdpSocket::sRecvCb(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port) |
| iva2k | 0:e614f7875b60 | 220 | { |
| iva2k | 0:e614f7875b60 | 221 | LwipNetUdpSocket* pMe = (LwipNetUdpSocket*) arg; |
| iva2k | 0:e614f7875b60 | 222 | return pMe->recvCb( pcb, p, addr, port ); |
| iva2k | 0:e614f7875b60 | 223 | } |
| iva2k | 0:e614f7875b60 | 224 | |
| iva2k | 0:e614f7875b60 | 225 | #endif |