Zoltan Hudak / Mbed 2 deprecated WebSwitch_WIZ550io

HTTP Server serving a simple webpage which enables to remotely turn LED1 on/off. Compile, download, run and type 'IP_address/secret/' (don't forget the last '/') into your web browser and hit ENTER.

Dependencies:   W5500Interface mbed

Turn LED1, or other digital output, on/off using a web browser.

In this example we create a HTTP server that will serve a simple Web page to remotely turn LED1, or other digital output on the mbed board, on/off by using a web browser. A WIZ550io module or W5500 Network-Shielld is used to assure connection between the mbed module and the Ethernet network (Internet).

Needed parts:

  • mbed board
  • WIZ550io module or W5500 Network-Shield
  • Wires
  • Web browser (Internet Explorer, Safari, Firefox, Chrome ...) running on Windows, Mac, Linux, iPhone or Android device.
/media/uploads/hudakz/webswitch_wiz.jpg/media/uploads/hudakz/webswitch_mobile01.jpg

The project was inspired by the Tuxgraphics Web Switch. Thank you Guido!

NOTE:

main.cpp@2:3803ea61daa1, 2015-03-16 (annotated)

Committer:
hudakz
Date:
Mon Mar 16 09:30:02 2015 +0000
Revision:
2:3803ea61daa1
Parent:
1:343d3c7e13b8
Child:
3:d0e3d1bd73e6
Updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 2:3803ea61daa1 1 /*
hudakz 2:3803ea61daa1 2 * In this project LED1 on the mbed board is switched on/off using a web browser.
hudakz 1:343d3c7e13b8 3 * However, you can easily modify the project to remotely switch on/off any external device.
hudakz 0:5c8e08cf3b33 4 * The HTTP server is built from an mbed board and a WIZ550io board.
hudakz 0:5c8e08cf3b33 5 * The example is based on the Tuxgraphics Web Switch <http://www.tuxgraphics.org/>.
hudakz 0:5c8e08cf3b33 6 */
hudakz 0:5c8e08cf3b33 7 #include "mbed.h"
hudakz 0:5c8e08cf3b33 8 #include "EthernetInterface.h"
hudakz 0:5c8e08cf3b33 9 #include <string>
hudakz 0:5c8e08cf3b33 10
hudakz 0:5c8e08cf3b33 11 using namespace std;
hudakz 0:5c8e08cf3b33 12
hudakz 0:5c8e08cf3b33 13 Serial serial(USBTX, USBRX);
hudakz 0:5c8e08cf3b33 14
hudakz 0:5c8e08cf3b33 15 #if defined(TARGET_LPC1768)
hudakz 1:343d3c7e13b8 16 EthernetInterface eth(p11, p12, p13, p8, p14); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 17 #elif defined(TARGET_FRDM_KL25Z)
hudakz 1:343d3c7e13b8 18 EthernetInterface eth(PTD2, PTD3, PTD1, PTD0, PTD5); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 19 #elif defined(TARGET_FRDM_KL46Z)
hudakz 1:343d3c7e13b8 20 EthernetInterface eth(PTD2, PTD3, PTD1, PTD0, PTD5); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 21 #elif defined(TARGET_LPC11U24)
hudakz 1:343d3c7e13b8 22 EthernetInterface eth(P16, P15, P13, P17, P18); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 23 #elif defined(TARGET_NUCLEO_F030R8)
hudakz 1:343d3c7e13b8 24 EthernetInterface eth(PB_5, PB_4, PB_3, PB_10, PA_8); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 25 #elif defined(TARGET_NUCLEO_F072RB)
hudakz 1:343d3c7e13b8 26 EthernetInterface eth(PB_5, PB_4, PB_3, PB_10, PA_8); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 27 #elif defined(TARGET_NUCLEO_F103RB)
hudakz 1:343d3c7e13b8 28 EthernetInterface eth(PB_5, PB_4, PB_3, PB_10, PA_8); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 29 #elif defined(TARGET_NUCLEO_F401RE)
hudakz 1:343d3c7e13b8 30 EthernetInterface eth(PB_5, PB_4, PB_3, PB_10, PA_8); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 31 #elif defined(TARGET_NUCLEO_F411RE)
hudakz 1:343d3c7e13b8 32 EthernetInterface eth(PB_5, PB_4, PB_3, PB_10, PA_8); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 33
hudakz 0:5c8e08cf3b33 34 // If your board/plaform is not present yet then uncomment
hudakz 1:343d3c7e13b8 35 // the following two lines and replace modify as appropriate.
hudakz 0:5c8e08cf3b33 36
hudakz 0:5c8e08cf3b33 37 //#elif defined(TARGET_YOUR_BOARD)
hudakz 1:343d3c7e13b8 38 //EthernetInterface eth(SPI_MOSI, SPI_MISO, SPI_SCK, SPI_CS, RESET); // MOSI, MISO, SCK, CS, RESET
hudakz 0:5c8e08cf3b33 39 #endif
hudakz 0:5c8e08cf3b33 40
hudakz 0:5c8e08cf3b33 41 // Note:
hudakz 0:5c8e08cf3b33 42 // If it happends that any of the SPI_MOSI, SPI_MISO, SPI_SCK, SPI_CS or RESET pins collide with LED1 pin
hudakz 0:5c8e08cf3b33 43 // then either use different SPI port (if available on the board) and change the pin names
hudakz 0:5c8e08cf3b33 44 // in the constructor spi(...) accordingly or instead of using LED1 pin, select
hudakz 0:5c8e08cf3b33 45 // a free pin (not used by SPI port) and connect to it an external LED which is connected
hudakz 0:5c8e08cf3b33 46 // to a 220 Ohm resitor that is connected to the groud.
hudakz 0:5c8e08cf3b33 47 // In the second case remember to replace LED1 in sw(LED1) constructor (see below).
hudakz 0:5c8e08cf3b33 48 // IP address must be also unique and compatible with your network. Change as appropriate.
hudakz 0:5c8e08cf3b33 49 const char MY_IP[] = "192.168.1.181";
hudakz 0:5c8e08cf3b33 50 const char MY_NETMASK[] = "255.255.255.0";
hudakz 0:5c8e08cf3b33 51 const char MY_GATEWAY[] = "192.168.1.1";
hudakz 0:5c8e08cf3b33 52 int MY_PORT = 80;
hudakz 0:5c8e08cf3b33 53
hudakz 0:5c8e08cf3b33 54 TCPSocketServer server;
hudakz 0:5c8e08cf3b33 55 TCPSocketConnection client;
hudakz 0:5c8e08cf3b33 56 bool serverIsListening = false;
hudakz 0:5c8e08cf3b33 57
hudakz 0:5c8e08cf3b33 58 DigitalOut sw(LED1); // Change LED1 to a pin of your choice.
hudakz 0:5c8e08cf3b33 59 // However, make sure that it does not collide with any of the SPI pins
hudakz 0:5c8e08cf3b33 60
hudakz 0:5c8e08cf3b33 61 const string PASSWORD = "secret"; // change as you like
hudakz 0:5c8e08cf3b33 62 const string HTTP_OK = "HTTP/1.0 200 OK";
hudakz 0:5c8e08cf3b33 63 const string MOVED_PERM = "HTTP/1.0 301 Moved Permanently\r\nLocation: ";
hudakz 0:5c8e08cf3b33 64 const string UNAUTHORIZED = "HTTP/1.0 401 Unauthorized";
hudakz 0:5c8e08cf3b33 65
hudakz 0:5c8e08cf3b33 66 string httpHeader; // HTTP header
hudakz 0:5c8e08cf3b33 67 string httpContent; // HTTP content
hudakz 0:5c8e08cf3b33 68
hudakz 0:5c8e08cf3b33 69 // analyse the url given
hudakz 0:5c8e08cf3b33 70 // return values: -1 invalid password
hudakz 0:5c8e08cf3b33 71 // -2 no command given but password valid
hudakz 0:5c8e08cf3b33 72 // -3 just refresh page
hudakz 0:5c8e08cf3b33 73 // 0 switch off
hudakz 0:5c8e08cf3b33 74 // 1 switch on
hudakz 0:5c8e08cf3b33 75 //
hudakz 0:5c8e08cf3b33 76 // The string passed to this function will look like this:
hudakz 0:5c8e08cf3b33 77 // GET /password HTTP/1.....
hudakz 0:5c8e08cf3b33 78 // GET /password/ HTTP/1.....
hudakz 0:5c8e08cf3b33 79 // GET /password/?sw=1 HTTP/1.....
hudakz 0:5c8e08cf3b33 80
hudakz 0:5c8e08cf3b33 81 // GET /password/?sw=0 HTTP/1.....
hudakz 0:5c8e08cf3b33 82 int8_t analyse_get_url(string& str) {
hudakz 0:5c8e08cf3b33 83 if(str.substr(5, PASSWORD.size()) != PASSWORD)
hudakz 0:5c8e08cf3b33 84 return(-1);
hudakz 0:5c8e08cf3b33 85
hudakz 0:5c8e08cf3b33 86 uint8_t pos = 5 + PASSWORD.size();
hudakz 0:5c8e08cf3b33 87
hudakz 0:5c8e08cf3b33 88 if(str.substr(pos, 1) == " ")
hudakz 0:5c8e08cf3b33 89 return(-2);
hudakz 0:5c8e08cf3b33 90
hudakz 0:5c8e08cf3b33 91 if(str.substr(pos, 1) != "/")
hudakz 0:5c8e08cf3b33 92 return(-1);
hudakz 0:5c8e08cf3b33 93
hudakz 0:5c8e08cf3b33 94 pos++;
hudakz 0:5c8e08cf3b33 95
hudakz 0:5c8e08cf3b33 96 string cmd(str.substr(pos, 5));
hudakz 0:5c8e08cf3b33 97
hudakz 0:5c8e08cf3b33 98 if(cmd == "?sw=0")
hudakz 0:5c8e08cf3b33 99 return(0);
hudakz 0:5c8e08cf3b33 100
hudakz 0:5c8e08cf3b33 101 if(cmd == "?sw=1")
hudakz 0:5c8e08cf3b33 102 return(1);
hudakz 0:5c8e08cf3b33 103
hudakz 0:5c8e08cf3b33 104 return(-3);
hudakz 0:5c8e08cf3b33 105 }
hudakz 0:5c8e08cf3b33 106
hudakz 0:5c8e08cf3b33 107 /**
hudakz 0:5c8e08cf3b33 108 * @brief
hudakz 0:5c8e08cf3b33 109 * @note
hudakz 0:5c8e08cf3b33 110 * @param
hudakz 0:5c8e08cf3b33 111 * @retval
hudakz 0:5c8e08cf3b33 112 */
hudakz 0:5c8e08cf3b33 113 string& moved_perm(uint8_t flag) {
hudakz 0:5c8e08cf3b33 114 if(flag == 1)
hudakz 0:5c8e08cf3b33 115 httpContent = "/" + PASSWORD + "/";
hudakz 0:5c8e08cf3b33 116 else
hudakz 0:5c8e08cf3b33 117 httpContent = "";
hudakz 0:5c8e08cf3b33 118
hudakz 0:5c8e08cf3b33 119 httpContent += "<h1>301 Moved Permanently</h1>\r\n";
hudakz 0:5c8e08cf3b33 120
hudakz 0:5c8e08cf3b33 121 return(httpContent);
hudakz 0:5c8e08cf3b33 122 }
hudakz 0:5c8e08cf3b33 123
hudakz 0:5c8e08cf3b33 124 /**
hudakz 0:5c8e08cf3b33 125 * @brief
hudakz 0:5c8e08cf3b33 126 * @note
hudakz 0:5c8e08cf3b33 127 * @param
hudakz 0:5c8e08cf3b33 128 * @retval
hudakz 0:5c8e08cf3b33 129 */
hudakz 0:5c8e08cf3b33 130 string& view(uint8_t status) {
hudakz 0:5c8e08cf3b33 131 httpContent = "<h2>Web Switch</h2>\r\n";
hudakz 0:5c8e08cf3b33 132
hudakz 0:5c8e08cf3b33 133 if(status == 1) {
hudakz 0:5c8e08cf3b33 134 httpContent += "<pre>\r\n <font color=#FF0000>ON</font>";
hudakz 0:5c8e08cf3b33 135 httpContent += " <a href=\"./?sw=0\">[switch off]</a>\r\n";
hudakz 0:5c8e08cf3b33 136 }
hudakz 0:5c8e08cf3b33 137 else {
hudakz 0:5c8e08cf3b33 138 httpContent += "<pre>\r\n <font color=#00FF00>OFF</font>";
hudakz 0:5c8e08cf3b33 139 httpContent += " <a href=\"./?sw=1\">[switch on]</a>\r\n";
hudakz 0:5c8e08cf3b33 140 }
hudakz 0:5c8e08cf3b33 141
hudakz 0:5c8e08cf3b33 142 httpContent += " <a href=\".\">[refresh status]</a>\r\n";
hudakz 0:5c8e08cf3b33 143 httpContent += "</pre>\r\n";
hudakz 0:5c8e08cf3b33 144 httpContent += "<hr>\r\n";
hudakz 0:5c8e08cf3b33 145 return httpContent;
hudakz 0:5c8e08cf3b33 146 }
hudakz 0:5c8e08cf3b33 147
hudakz 0:5c8e08cf3b33 148 /**
hudakz 0:5c8e08cf3b33 149 * @brief
hudakz 0:5c8e08cf3b33 150 * @note
hudakz 0:5c8e08cf3b33 151 * @param
hudakz 0:5c8e08cf3b33 152 * @retval
hudakz 0:5c8e08cf3b33 153 */
hudakz 0:5c8e08cf3b33 154 void http_send(TCPSocketConnection& client, string& header, string& content) {
hudakz 0:5c8e08cf3b33 155 char content_length[5] = { };
hudakz 0:5c8e08cf3b33 156
hudakz 0:5c8e08cf3b33 157 header += "\r\nContent-Type: text/html\r\n";
hudakz 0:5c8e08cf3b33 158 header += "Content-Length: ";
hudakz 0:5c8e08cf3b33 159 sprintf(content_length, "%d", content.length());
hudakz 0:5c8e08cf3b33 160 header += string(content_length) + "\r\n";
hudakz 0:5c8e08cf3b33 161 header += "Pragma: no-cache\r\n";
hudakz 0:5c8e08cf3b33 162 header += "Connection: About to close\r\n";
hudakz 0:5c8e08cf3b33 163 header += "\r\n";
hudakz 0:5c8e08cf3b33 164
hudakz 0:5c8e08cf3b33 165 string webpage = header + content;
hudakz 0:5c8e08cf3b33 166 client.send (const_cast<char*>(webpage.c_str ()), webpage.length ());
hudakz 0:5c8e08cf3b33 167 }
hudakz 0:5c8e08cf3b33 168
hudakz 0:5c8e08cf3b33 169 /**
hudakz 0:5c8e08cf3b33 170 * @brief
hudakz 0:5c8e08cf3b33 171 * @note
hudakz 0:5c8e08cf3b33 172 * @param
hudakz 0:5c8e08cf3b33 173 * @retval
hudakz 0:5c8e08cf3b33 174 */
hudakz 0:5c8e08cf3b33 175 int main(void) {
hudakz 0:5c8e08cf3b33 176 int ret = eth.init(MY_IP, MY_NETMASK, MY_GATEWAY);
hudakz 0:5c8e08cf3b33 177
hudakz 0:5c8e08cf3b33 178 if(!ret) {
hudakz 0:5c8e08cf3b33 179 serial.printf("Initialized, MY_MAC: %s\n", eth.getMACAddress());
hudakz 0:5c8e08cf3b33 180 serial.printf
hudakz 0:5c8e08cf3b33 181 (
hudakz 0:5c8e08cf3b33 182 "Connected, MY_IP: %s, MY_NETMASK: %s, MY_GATEWAY: %s\n",
hudakz 0:5c8e08cf3b33 183 eth.getIPAddress(),
hudakz 0:5c8e08cf3b33 184 eth.getNetworkMask(),
hudakz 0:5c8e08cf3b33 185 eth.getGateway()
hudakz 0:5c8e08cf3b33 186 );
hudakz 0:5c8e08cf3b33 187 }
hudakz 0:5c8e08cf3b33 188 else {
hudakz 0:5c8e08cf3b33 189 serial.printf("Error eth.init() - ret = %d\n", ret);
hudakz 0:5c8e08cf3b33 190 return -1;
hudakz 0:5c8e08cf3b33 191 }
hudakz 0:5c8e08cf3b33 192
hudakz 0:5c8e08cf3b33 193 //setup tcp socket
hudakz 0:5c8e08cf3b33 194 if(server.bind(MY_PORT) < 0) {
hudakz 0:5c8e08cf3b33 195 serial.printf("TCP server bind failed.\n\r");
hudakz 0:5c8e08cf3b33 196 return -1;
hudakz 0:5c8e08cf3b33 197 }
hudakz 0:5c8e08cf3b33 198 else {
hudakz 0:5c8e08cf3b33 199 serial.printf("TCP server bind succeeded.\n\r");
hudakz 0:5c8e08cf3b33 200 serverIsListening = true;
hudakz 0:5c8e08cf3b33 201 }
hudakz 0:5c8e08cf3b33 202
hudakz 0:5c8e08cf3b33 203 if(server.listen(1) < 0) {
hudakz 0:5c8e08cf3b33 204 serial.printf("TCP server listen failed.\n\r");
hudakz 0:5c8e08cf3b33 205 return -1;
hudakz 0:5c8e08cf3b33 206 }
hudakz 0:5c8e08cf3b33 207 else {
hudakz 0:5c8e08cf3b33 208 serial.printf("TCP server is listening...\n\r");
hudakz 0:5c8e08cf3b33 209 }
hudakz 0:5c8e08cf3b33 210
hudakz 0:5c8e08cf3b33 211 while(serverIsListening) {
hudakz 0:5c8e08cf3b33 212 if(server.accept(client) >= 0) {
hudakz 0:5c8e08cf3b33 213 char buf[1024] = { };
hudakz 0:5c8e08cf3b33 214 size_t size = 0;
hudakz 0:5c8e08cf3b33 215
hudakz 0:5c8e08cf3b33 216 serial.printf("Client connected!\n\rIP: %s\n\r", client.get_address());
hudakz 0:5c8e08cf3b33 217
hudakz 0:5c8e08cf3b33 218 switch(client.receive(buf, 1023)) {
hudakz 0:5c8e08cf3b33 219 case 0:
hudakz 0:5c8e08cf3b33 220 serial.printf("Recieved buffer is empty.\n\r");
hudakz 0:5c8e08cf3b33 221 break;
hudakz 0:5c8e08cf3b33 222
hudakz 0:5c8e08cf3b33 223 case -1:
hudakz 0:5c8e08cf3b33 224 serial.printf("Failed to read data from client.\n\r");
hudakz 0:5c8e08cf3b33 225 break;
hudakz 0:5c8e08cf3b33 226
hudakz 0:5c8e08cf3b33 227 default:
hudakz 0:5c8e08cf3b33 228 size = strlen(buf);
hudakz 0:5c8e08cf3b33 229
hudakz 0:5c8e08cf3b33 230 string received((char*)buf);
hudakz 0:5c8e08cf3b33 231
hudakz 0:5c8e08cf3b33 232 if(received.substr(0, 3) != "GET") {
hudakz 0:5c8e08cf3b33 233 httpHeader = HTTP_OK;
hudakz 0:5c8e08cf3b33 234 httpContent = "<h1>200 OK</h1>";
hudakz 0:5c8e08cf3b33 235 http_send(client, httpHeader, httpContent);
hudakz 0:5c8e08cf3b33 236 continue;
hudakz 0:5c8e08cf3b33 237 }
hudakz 0:5c8e08cf3b33 238
hudakz 0:5c8e08cf3b33 239 if(received.substr(0, 6) == "GET / ") {
hudakz 0:5c8e08cf3b33 240 httpHeader = HTTP_OK;
hudakz 0:5c8e08cf3b33 241 httpContent = "<p>Usage: http://host_or_ip/password</p>\r\n";
hudakz 0:5c8e08cf3b33 242 http_send(client, httpHeader, httpContent);
hudakz 0:5c8e08cf3b33 243 continue;
hudakz 0:5c8e08cf3b33 244 }
hudakz 0:5c8e08cf3b33 245
hudakz 0:5c8e08cf3b33 246 int cmd = analyse_get_url(received);
hudakz 0:5c8e08cf3b33 247
hudakz 0:5c8e08cf3b33 248 if(cmd == -2) {
hudakz 0:5c8e08cf3b33 249
hudakz 0:5c8e08cf3b33 250 // redirect to the right base url
hudakz 0:5c8e08cf3b33 251 httpHeader = MOVED_PERM;
hudakz 0:5c8e08cf3b33 252 http_send(client, httpHeader, moved_perm(1));
hudakz 0:5c8e08cf3b33 253 continue;
hudakz 0:5c8e08cf3b33 254 }
hudakz 0:5c8e08cf3b33 255
hudakz 0:5c8e08cf3b33 256 if(cmd == -1) {
hudakz 0:5c8e08cf3b33 257 httpHeader = UNAUTHORIZED;
hudakz 0:5c8e08cf3b33 258 httpContent = "<h1>401 Unauthorized</h1>";
hudakz 0:5c8e08cf3b33 259 http_send(client, httpHeader, httpContent);
hudakz 0:5c8e08cf3b33 260 continue;
hudakz 0:5c8e08cf3b33 261 }
hudakz 0:5c8e08cf3b33 262
hudakz 0:5c8e08cf3b33 263 if(cmd == 1) {
hudakz 0:5c8e08cf3b33 264 sw = 1; // switch on
hudakz 0:5c8e08cf3b33 265 }
hudakz 0:5c8e08cf3b33 266
hudakz 0:5c8e08cf3b33 267 if(cmd == 0) {
hudakz 0:5c8e08cf3b33 268 sw = 0; // switch off
hudakz 0:5c8e08cf3b33 269 }
hudakz 0:5c8e08cf3b33 270
hudakz 0:5c8e08cf3b33 271 httpHeader = HTTP_OK;
hudakz 0:5c8e08cf3b33 272 http_send(client, httpHeader, view(sw));
hudakz 0:5c8e08cf3b33 273 }
hudakz 0:5c8e08cf3b33 274
hudakz 0:5c8e08cf3b33 275 client.close();
hudakz 0:5c8e08cf3b33 276
hudakz 0:5c8e08cf3b33 277 serial.printf("Connection closed.\n\rTCP server is listening...\n\r");
hudakz 0:5c8e08cf3b33 278 }
hudakz 0:5c8e08cf3b33 279 }
hudakz 0:5c8e08cf3b33 280 }