A tiny webserver alowing to remotely turn on or turn off a digital output on an STM32F407VET6 board. For more details see https://os.mbed.com/users/hudakz/code/STM32F407VET6_Hello/
Dependencies: EthernetInterface mbed-rtos 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/off by using a web browser.
Notice that DHCP is turned on by default. The IP address assigned to the WebSwitch server along with an instruction how to use it is printed to the connected PC's serial terminal window during program start up.
For more details on how to connect an Ethernet interface to a STM32F407VET6 board see https://os.mbed.com/users/hudakz/code/STM32F407VET6_Hello/.
The project was inspired by the Tuxgraphics Web Switch. Thank you Guido!
main.cpp
- Committer:
- hudakz
- Date:
- 2018-04-03
- Revision:
- 1:a583ba376cc7
- Parent:
- 0:7764029ff97d
File content as of revision 1:a583ba376cc7:
// Blinky demo for the STM32F407VET6 boards. // See http://wiki.stm32duino.com/index.php?title=STM32F407. // // Use "Seed Arch Max" as target platform for the online compiler. #include "mbed.h" #include "EthernetInterface.h" #include <stdio.h> #include <string> using namespace std; #define PORT 80 EthernetInterface ethernet; TCPSocketServer server; bool serverIsListening = false; TCPSocketConnection client; bool clientIsConnected = false; const int OFF = 1; const int ON = 0; DigitalOut sw(PA_6); float roomTemp = 21.8; // A temperature sensor output 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 /** * @brief Defines a custom MAC address * @note Uncomment the code below to define a unique MAC address. * Modify the mac array items as needed. * @param * @retval */ extern "C" void mbed_mac_address(char* mac) { mac[0] = 0x00; mac[1] = 0x01; mac[2] = 0x02; mac[3] = 0x03; mac[4] = 0x04; mac[5] = 0x05; }; /** * @brief Analyses the received URL * @note 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..... * @param url URL string * @retval -1 invalid password * -2 no command given but password valid * -3 just refresh page * 0 switch off * 1 switch on */ int8_t analyseURL(string& url) { if(url.substr(5, PASSWORD.size()) != PASSWORD) return(-1); uint8_t pos = 5 + PASSWORD.size(); if(url.substr(pos, 1) == " ") return(-2); if(url.substr(pos++, 1) != "/") return(-1); string cmd(url.substr(pos, 5)); if(cmd == "?sw=0") return(OFF); if(cmd == "?sw=1") return(ON); return(-3); } /** * @brief * @note * @param * @retval */ string& movedPermanently(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& showWebPage(uint8_t status) { char roomTempStr[5]; //roomTemp = ds1820.read(); sprintf(roomTempStr, "%3.1f", roomTemp); httpContent = "<h2><a href=\".\" title=\"Click to refresh the page\">Smart Home</a></h2>"; httpContent += "<pre>Temperature:\t" + string(roomTempStr) + "°C\r\n</pre>"; if(status == ON) { httpContent += "<pre>\r\nHeating:\t<font color=#FF0000>On </font>"; httpContent += " <a href=\"./?sw=0\"><button>Turn off</button></a>\r\n"; } else { httpContent += "<pre>\r\nHeating:\t<font color=#999999>Off</font>"; httpContent += " <a href=\"./?sw=1\"><button>Turn on</button></a>\r\n"; } httpContent += "</pre>\r\n"; httpContent += "<hr>\r\n"; httpContent += "<pre>2017 armMBED</pre>"; return httpContent; } /** * @brief * @note * @param * @retval */ void sendHTTP(TCPSocketConnection& client, string& header, string& content) { char contentLength[5] = { }; header += "\r\nContent-Type: text/html\r\n"; header += "Content-Length: "; sprintf(contentLength, "%d", content.length()); header += string(contentLength) + "\r\n"; header += "Pragma: no-cache\r\n"; header += "Connection: About to close\r\n"; header += "\r\n"; string webpage = header + content; client.send((char*)webpage.c_str(), webpage.length()); clientIsConnected = false; printf("HTTP sent.\n\r"); } /** * @brief * @note * @param * @retval */ int main(void) { sw = OFF; //setup ethernet interface ethernet.init(); //Use DHCP //ethernet.init("192.168.1.181", "255.255.255.0", "192.168.1.1"); // Use static IP ethernet.connect(); printf("USAGE: Type '%s/%s/' into your web browser and hit ENTER\r\n", ethernet.getIPAddress(), PASSWORD.c_str()); printf("NOTE: Don't forget to type the last '/'.\r\n\r\n"); //setup tcp socket if(server.bind(PORT) < 0) { printf("HTTP server bind failed.\n\r"); return -1; } else { printf("HTTP server bind succeeded.\n\r"); serverIsListening = true; } if(server.listen(1) < 0) { printf("HTTP server listen failed.\n\r"); return -1; } else { printf("HTTP server is listening...\n\r"); } //listening for http GET request while(serverIsListening) { if(server.accept(client) < 0) { printf("Failed to accept connection.\n\r"); } else { printf("\r\n=========================================\r\n"); printf("Connection accepted!\n\rIP: %s\n\r", client.get_address()); clientIsConnected = true; while(clientIsConnected) { char buffer[1024] = { }; switch(client.receive(buffer, 1023)) { case 0: printf("Recieved buffer is empty.\n\r"); clientIsConnected = false; break; case -1: printf("Failed to read data from client.\n\r"); clientIsConnected = false; break; default: printf("Recieved Data: %d\n\r\n\r%.*s\n\r", strlen(buffer), strlen(buffer), buffer); string received(buffer); if(received.substr(0, 3) != "GET") { httpHeader = HTTP_OK; httpContent = "<h1>200 OK</h1>"; sendHTTP(client, httpHeader, httpContent); continue; } if(received.substr(0, 6) == "GET / ") { httpHeader = HTTP_OK; httpContent = "<p>USAGE: Type 'http://ip_address/password/' into your web browser and hit ENTER</p>\r\n"; sendHTTP(client, httpHeader, httpContent); continue; } int cmd = analyseURL(received); if(cmd == -2) { // redirect to the correct base URL httpHeader = MOVED_PERM; sendHTTP(client, httpHeader, movedPermanently(1)); continue; } if(cmd == -1) { httpHeader = UNAUTHORIZED; httpContent = "<h1>401 Unauthorized</h1>"; sendHTTP(client, httpHeader, httpContent); continue; } if(cmd == ON) { sw = ON; // turn the switch on } if(cmd == OFF) { sw = OFF; // turn the switch off } httpHeader = HTTP_OK; sendHTTP(client, httpHeader, showWebPage(sw)); break; } } printf("Closing connection.\n\r"); printf("HTTP server is listening...\n\r"); client.close(); } } }