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.
The project was inspired by the Tuxgraphics Web Switch. Thank you Guido!
NOTE:
- For a Web Switch using an ENC28J60 Ethernet module see WebSwitch_ENC28J60
- For a Web Switch using mbed's built in Ethernet PHY see WebSwitch_mbed-dev or WebSwitch_mbed-os
Diff: main.cpp
- Revision:
- 0:5c8e08cf3b33
- Child:
- 1:343d3c7e13b8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Mar 15 22:47:37 2015 +0000 @@ -0,0 +1,290 @@ +/* In this example LED1 on the mbed board is switched on/off using a web browser. + * The HTTP server is built from an mbed board and a WIZ550io board. + * The example is based on the Tuxgraphics Web Switch <http://www.tuxgraphics.org/>. + */ +#include "mbed.h" +#include "EthernetInterface.h" +#include <string> + +using namespace std; + +Serial serial(USBTX, USBRX); + +// Do not change the name! It is used within the UIPEthernet library. +#if defined(TARGET_LPC1768) +SPI spi(p11, p12, p13); // MOSI, MISO, SCK +EthernetInterface eth(&spi, p8, p14); // SPI, CS, RESET +#elif defined(TARGET_FRDM_KL25Z) +SPI spi(PTD2, PTD3, PTD1); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PTD0, PTD5); // SPI, CS, RESET +#elif defined(TARGET_FRDM_KL46Z) +SPI spi(PTD2, PTD3, PTD1); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PTD0, PTD5); // SPI, CS, RESET +#elif defined(TARGET_LPC11U24) +SPI spi(P16, P15, P13); // MOSI, MISO, SCK +EthernetInterface eth(&spi, P17, P18); // SPI, CS, RESET +#elif defined(TARGET_NUCLEO_F030R8) +SPI spi(PB_5, PB_4, PB_3); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PB_10, PA_8); // SPI, CS, RESET +#elif defined(TARGET_NUCLEO_F072RB) +SPI spi(PB_5, PB_4, PB_3); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PB_10, PA_8); // SPI, CS, RESET +#elif defined(TARGET_NUCLEO_F103RB) +SPI spi(PB_5, PB_4, PB_3); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PB_10, PA_8); // SPI, CS, RESET +#elif defined(TARGET_NUCLEO_F401RE) +SPI spi(PB_5, PB_4, PB_3); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PB_10, PA_8); // SPI, CS, RESET +#elif defined(TARGET_NUCLEO_F411RE) +SPI spi(PB_5, PB_4, PB_3); // MOSI, MISO, SCK +EthernetInterface eth(&spi, PB_10, PA_8); // SPI, CS, RESET + +// If your board/plaform is not present yet then uncomment +// the following three lines and replace modify as appropriate. + +//#elif defined(TARGET_YOUR_BOARD) +//SPI spi(SPI_MOSI, SPI_MISO, SPI_SCK); // MOSI, MISO, SCK +//EthernetInterface eth(&spi, SPI_CS, RESET); // SPI, CS, RESET +#endif + +// Note: +// If it happends that any of the SPI_MOSI, SPI_MISO, SPI_SCK, SPI_CS or RESET pins collide with LED1 pin +// then either use different SPI port (if available on the board) and change the pin names +// in the constructor spi(...) accordingly or instead of using LED1 pin, select +// a free pin (not used by SPI port) and connect to it an external LED which is connected +// to a 220 Ohm resitor that is connected to the groud. +// In the second case remember to replace LED1 in sw(LED1) constructor (see below). +// IP address must be also unique and compatible with your network. Change as appropriate. +const char MY_IP[] = "192.168.1.181"; +const char MY_NETMASK[] = "255.255.255.0"; +const char MY_GATEWAY[] = "192.168.1.1"; +int MY_PORT = 80; + +TCPSocketServer server; +TCPSocketConnection client; +bool serverIsListening = false; + +DigitalOut sw(LED1); // Change LED1 to a pin of your choice. + // However, make sure that it does not collide with any of the SPI pins + // already used in the UIPEthernet(...) constructor above! + +const string PASSWORD = "secret"; // change as you like +const string HTTP_OK = "HTTP/1.0 200 OK"; +const string MOVED_PERM = "HTTP/1.0 301 Moved Permanently\r\nLocation: "; +const string UNAUTHORIZED = "HTTP/1.0 401 Unauthorized"; + +string httpHeader; // HTTP header +string httpContent; // HTTP content + +// analyse the url given +// return values: -1 invalid password +// -2 no command given but password valid +// -3 just refresh page +// 0 switch off +// 1 switch on +// +// The string passed to this function will look like this: +// GET /password HTTP/1..... +// GET /password/ HTTP/1..... +// GET /password/?sw=1 HTTP/1..... + +// GET /password/?sw=0 HTTP/1..... +int8_t analyse_get_url(string& str) { + if(str.substr(5, PASSWORD.size()) != PASSWORD) + return(-1); + + uint8_t pos = 5 + PASSWORD.size(); + + if(str.substr(pos, 1) == " ") + return(-2); + + if(str.substr(pos, 1) != "/") + return(-1); + + pos++; + + string cmd(str.substr(pos, 5)); + + if(cmd == "?sw=0") + return(0); + + if(cmd == "?sw=1") + return(1); + + return(-3); +} + +/** + * @brief + * @note + * @param + * @retval + */ +string& moved_perm(uint8_t flag) { + if(flag == 1) + httpContent = "/" + PASSWORD + "/"; + else + httpContent = ""; + + httpContent += "<h1>301 Moved Permanently</h1>\r\n"; + + return(httpContent); +} + +/** + * @brief + * @note + * @param + * @retval + */ +string& view(uint8_t status) { + httpContent = "<h2>Web Switch</h2>\r\n"; + + if(status == 1) { + httpContent += "<pre>\r\n <font color=#FF0000>ON</font>"; + httpContent += " <a href=\"./?sw=0\">[switch off]</a>\r\n"; + } + else { + httpContent += "<pre>\r\n <font color=#00FF00>OFF</font>"; + httpContent += " <a href=\"./?sw=1\">[switch on]</a>\r\n"; + } + + httpContent += " <a href=\".\">[refresh status]</a>\r\n"; + httpContent += "</pre>\r\n"; + httpContent += "<hr>\r\n"; + return httpContent; +} + +/** + * @brief + * @note + * @param + * @retval + */ +void http_send(TCPSocketConnection& client, string& header, string& content) { + char content_length[5] = { }; + + header += "\r\nContent-Type: text/html\r\n"; + header += "Content-Length: "; + sprintf(content_length, "%d", content.length()); + header += string(content_length) + "\r\n"; + header += "Pragma: no-cache\r\n"; + header += "Connection: About to close\r\n"; + header += "\r\n"; + + string webpage = header + content; + client.send (const_cast<char*>(webpage.c_str ()), webpage.length ()); +} + +/** + * @brief + * @note + * @param + * @retval + */ +int main(void) { + int ret = eth.init(MY_IP, MY_NETMASK, MY_GATEWAY); + + if(!ret) { + serial.printf("Initialized, MY_MAC: %s\n", eth.getMACAddress()); + serial.printf + ( + "Connected, MY_IP: %s, MY_NETMASK: %s, MY_GATEWAY: %s\n", + eth.getIPAddress(), + eth.getNetworkMask(), + eth.getGateway() + ); + } + else { + serial.printf("Error eth.init() - ret = %d\n", ret); + return -1; + } + + //setup tcp socket + if(server.bind(MY_PORT) < 0) { + serial.printf("TCP server bind failed.\n\r"); + return -1; + } + else { + serial.printf("TCP server bind succeeded.\n\r"); + serverIsListening = true; + } + + if(server.listen(1) < 0) { + serial.printf("TCP server listen failed.\n\r"); + return -1; + } + else { + serial.printf("TCP server is listening...\n\r"); + } + + while(serverIsListening) { + if(server.accept(client) >= 0) { + char buf[1024] = { }; + size_t size = 0; + + serial.printf("Client connected!\n\rIP: %s\n\r", client.get_address()); + + switch(client.receive(buf, 1023)) { + case 0: + serial.printf("Recieved buffer is empty.\n\r"); + break; + + case -1: + serial.printf("Failed to read data from client.\n\r"); + break; + + default: + size = strlen(buf); + + string received((char*)buf); + + if(received.substr(0, 3) != "GET") { + httpHeader = HTTP_OK; + httpContent = "<h1>200 OK</h1>"; + http_send(client, httpHeader, httpContent); + continue; + } + + if(received.substr(0, 6) == "GET / ") { + httpHeader = HTTP_OK; + httpContent = "<p>Usage: http://host_or_ip/password</p>\r\n"; + http_send(client, httpHeader, httpContent); + continue; + } + + int cmd = analyse_get_url(received); + + if(cmd == -2) { + + // redirect to the right base url + httpHeader = MOVED_PERM; + http_send(client, httpHeader, moved_perm(1)); + continue; + } + + if(cmd == -1) { + httpHeader = UNAUTHORIZED; + httpContent = "<h1>401 Unauthorized</h1>"; + http_send(client, httpHeader, httpContent); + continue; + } + + if(cmd == 1) { + sw = 1; // switch on + } + + if(cmd == 0) { + sw = 0; // switch off + } + + httpHeader = HTTP_OK; + http_send(client, httpHeader, view(sw)); + } + + client.close(); + + serial.printf("Connection closed.\n\rTCP server is listening...\n\r"); + } + } +}