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@1:343d3c7e13b8, 2015-03-16 (annotated)

Committer:
hudakz
Date:
Mon Mar 16 09:24:23 2015 +0000
Revision:
1:343d3c7e13b8
Parent:
0:5c8e08cf3b33
Child:
2:3803ea61daa1
Updated

Who changed what in which revision?

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