HTTP Server serving a simple webpage which enables to remotely turn a digital output on/off. Compile, download, run and type 'IP_address/secret/' (don't forget the last '/') into your web browser and hit ENTER.
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. An inexpensive ENC28J60 Ethernet module is used to assure connection between the mbed board and the Ethernet network (Internet). The ENC28J60 Ethernet module is driven by the UIPEthernet library.
Needed parts:
- mbed board
- ENC28J60 Ethernet module
- Wires
- Web browser (Internet Explorer, Safari, Firefox, Chrome ...) running on Windows, Mac, Linux, iPhone or Android device.
![]() | ![]() |
Notice that DHCP is turned on by default. If you prefer to use static IP address then uncomment line 234
The IP address assigned to the WebSwitch server along with an instruction how to use it is printed in the connected PC's serial terminal window during program start up.
Warning
Please notice that the 3.3V power supply chip (RT8183-B) installed on an STM32F103C8T6 board is not rated to power also the ENC28J60 board.
The project was inspired by the Tuxgraphics Web Switch. Thank you Guido!
NOTE:
- For a Web Switch using a WIZ550io or W5500 Ethernet module see WebSwitch_Wiz550io.
- For a Web Switch using mbed's built in Ethernet PHY see WebSwitch_mbed-dev or WebSwitch_mbed-os .
Diff: main.cpp
- Revision:
- 6:b38a3b476a45
- Parent:
- 5:0ab8292e37da
- Child:
- 7:f5e11393836d
diff -r 0ab8292e37da -r b38a3b476a45 main.cpp --- a/main.cpp Mon Mar 16 09:43:13 2015 +0000 +++ b/main.cpp Sun Aug 28 11:47:29 2016 +0000 @@ -5,14 +5,31 @@ * ENC28J60 is driven by the UIPEthernet library <https://github.com/ntruchsess/arduino_uip>. * The example is based on the Tuxgraphics Web Switch <http://www.tuxgraphics.org/>. */ -#include <mbed.h> -#include <UIPEthernet.h> -#include <UIPServer.h> -#include <UIPClient.h> -#include <string> + +//#define TARGET_STM32F103C8T6 1 // uncomment this line when using STM32F103C8T6 boards! + +#if defined(TARGET_STM32F103C8T6) + #define LED_PIN PC_13 + const int OFF = 1; + const int ON = 0; +#else + #define LED_PIN LED1 + const int OFF = 0; + const int ON = 1; +#endif + +#include "mbed.h" +#include "UIPEthernet.h" +#include "UIPServer.h" +#include "UIPClient.h" +#include "string" using namespace std; +Serial pc(USBTX, USBRX); + +#define DHCP 1 // if you'd like to use static IP address comment out this line + // UIPEthernet is the name of a global instance of UIPEthernetClass. // Do not change the name! It is used within the UIPEthernet library. #if defined(TARGET_LPC1768) @@ -21,12 +38,11 @@ UIPEthernetClass UIPEthernet(dp2, dp1, dp6, dp25); // mosi, miso, sck, cs #elif defined(TARGET_LPC11U68) UIPEthernetClass UIPEthernet(P0_9, P0_8, P1_29, P0_2); // mosi, miso, sck, cs -#elif defined(TARGET_NUCLEO_F103RB) -UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs -#elif defined(TARGET_NUCLEO_F401RE) -UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs -#elif defined(TARGET_NUCLEO_F411RE) -UIPEthernetClass UIPEthernet(PB_5, PB_4, PB_3, PB_6); // mosi, miso, sck, cs +#elif defined(TARGET_NUCLEO_F103RB) || defined(TARGET_NUCLEO_L152RE) || defined(TARGET_NUCLEO_F030R8) \ + || defined(TARGET_NUCLEO_F401RE) || defined(TARGET_NUCLEO_F302R8) || defined(TARGET_NUCLEO_L053R8) \ + || defined(TARGET_NUCLEO_F411RE) || defined(TARGET_NUCLEO_F334R8) || defined(TARGET_NUCLEO_F072RB) \ + || defined(TARGET_NUCLEO_F091RC) || defined(TARGET_NUCLEO_F303RE) || defined(TARGET_NUCLEO_F070RB) +UIPEthernetClass UIPEthernet(D4, D5, D3, D2); // mosi, miso, sck, cs // If your board/plaform is not present yet then uncomment // the following two lines and replace TARGET_YOUR_BOARD as appropriate. @@ -45,14 +61,11 @@ // In the second case remember to replace LED1 in sw(LED1) constructor (see below). // MAC number must be unique within the connected network. Modify as appropriate. const uint8_t MY_MAC[6] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x06 }; - -// IP address must be also unique and compatible with your network. Change as appropriate. -const IPAddress MY_IP(192, 168, 1, 181); const uint16_t MY_PORT = 80; // for HTTP connection EthernetServer myServer = EthernetServer(MY_PORT); // In this example we are turning on/off LED1. -DigitalOut sw(LED1); // Change LED1 to a pin of your choice. +DigitalOut sw(LED_PIN); // Change LED_PIN 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! @@ -75,7 +88,7 @@ // GET /password/ HTTP/1..... // GET /password/?sw=1 HTTP/1..... // GET /password/?sw=0 HTTP/1..... -int8_t analyse_get_url(string& str) { +int8_t analyseURL(string& str) { if(str.substr(5, PASSWORD.size()) != PASSWORD) return(-1); @@ -92,10 +105,10 @@ string cmd(str.substr(pos, 5)); if(cmd == "?sw=0") - return(0); + return(OFF); if(cmd == "?sw=1") - return(1); + return(ON); return(-3); } @@ -106,7 +119,7 @@ * @param * @retval */ -string& moved_perm(uint8_t flag) { +string& movedPermanently(uint8_t flag) { if(flag == 1) httpContent = "/" + PASSWORD + "/"; else @@ -123,19 +136,19 @@ * @param * @retval */ -string& view(uint8_t status) { +string& showWebPage(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"; + if(status == ON) { + httpContent += "<pre>\r\n <font color=#FF0000>ON </font>"; + httpContent += " <a href=\"./?sw=0\">[Turn 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 += "<pre>\r\n <font color=#BBBBBB>OFF</font>"; + httpContent += " <a href=\"./?sw=1\">[Turn on]</a>\r\n"; } - httpContent += " <a href=\".\">[refresh status]</a>\r\n"; +// httpContent += " <a href=\".\">[refresh status]</a>\r\n"; httpContent += "</pre>\r\n"; httpContent += "<hr>\r\n"; return httpContent; @@ -147,7 +160,7 @@ * @param * @retval */ -void http_send(EthernetClient& client, string& header, string& content) { +void sendHTTP(EthernetClient& client, string& header, string& content) { char content_length[5] = { }; header += "\r\nContent-Type: text/html\r\n"; @@ -169,7 +182,24 @@ * @retval */ int main(void) { +#if defined(DHCP) + pc.printf("Searching for DHCP server..\r\n"); + if(UIPEthernet.begin(MY_MAC) != 1) { + pc.printf("No DHCP server found.\r\n"); + pc.printf("Exiting application.\r\n"); + return 0; + } + pc.printf("DHCP server found.\r\n"); +#else + // IP address must be unique and compatible with your network. + const IPAddress MY_IP(192, 168, 1, 181); // Change as appropriate. UIPEthernet.begin(MY_MAC, MY_IP); +#endif + IPAddress localIP = UIPEthernet.localIP(); + pc.printf("Type "); + for(uint8_t i = 0; i < 3; i++) + pc.printf("%d.", localIP[i]); + pc.printf("%d/secret/ into your web browser and hit ENTER\r\n", localIP[3]); myServer.begin(); while(1) { EthernetClient client = myServer.available(); @@ -184,43 +214,43 @@ if(received.substr(0, 3) != "GET") { httpHeader = HTTP_OK; httpContent = "<h1>200 OK</h1>"; - http_send(client, httpHeader, httpContent); + sendHTTP(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); + sendHTTP(client, httpHeader, httpContent); continue; } - int cmd = analyse_get_url(received); + int cmd = analyseURL(received); if(cmd == -2) { // redirect to the right base url httpHeader = MOVED_PERM; - http_send(client, httpHeader, moved_perm(1)); + sendHTTP(client, httpHeader, movedPermanently(1)); continue; } if(cmd == -1) { httpHeader = UNAUTHORIZED; httpContent = "<h1>401 Unauthorized</h1>"; - http_send(client, httpHeader, httpContent); + sendHTTP(client, httpHeader, httpContent); continue; } - if(cmd == 1) { - sw = 1; // switch on + if(cmd == ON) { + sw = ON; // turn the switch on } - if(cmd == 0) { - sw = 0; // switch off + if(cmd == OFF) { + sw = OFF; // turn the switch off } httpHeader = HTTP_OK; - http_send(client, httpHeader, view(sw)); + sendHTTP(client, httpHeader, showWebPage(sw)); } } }