Webserver for Arduino ESP8266

webserver.ino

//Leonardo
Serial_ & dbgTerminal = Serial;
HardwareSerial & espSerial = Serial1;

////UNO & M328P
//#include <SoftwareSerial.h>
//SoftwareSerial dbgTerminal(10, 11); // RX, TX
//HardwareSerial & espSerial = Serial;

//
////MEGA2560 
//HardwareSerial & dbgTerminal = Serial;
//HardwareSerial & espSerial = Serial1;

// set pin numbers:
const int ledPin =  13;      // the number of the LED pin
const int ESP8266_CHPD = 4;

// Variables will change:
int ledState = HIGH;             // ledState used to set the LED

#define BUFFER_SIZE 128
char buffer[BUFFER_SIZE];

void setup() { 
  pinMode(ledPin, OUTPUT);  
  //pinMode(ESP8266_CHPD, OUTPUT);
      
  dbgTerminal.begin(9600); // Serial monitor
  espSerial.begin(115200); // ESP8266
    
  //while (!dbgTerminal) {
   // ; // wait for serial port to connect. Needed for Leonardo only
  //}

  dbgTerminal.println(F("ESP8266 demo."));

  //hardReset();
  //delay(2000);
  
  clearSerialBuffer();
  
  //connect to router
  //connectWiFi("YOUR_SSID", "YOUR_PASSWORD");
  
  //test if the module is ready
  //dbgTerminal.print("AT : ");
  //dbgTerminal.println( GetResponse("AT",100) );
    
  //Change to mode 1
  //dbgTerminal.print("AT+CWMODE=1 : ");
  //dbgTerminal.println( GetResponse("AT+CWMODE=1",10) );
        
  //set the multiple connection mode
  dbgTerminal.print(F("AT+CIPMUX=1 : "));
  dbgTerminal.println( GetResponse("AT+CIPMUX=1",10) );
  
  //set the server of port 80 check "no change" or "OK"
  dbgTerminal.print(F("AT+CIPSERVER=1,8888 : "));
  dbgTerminal.println( GetResponse("AT+CIPSERVER=1,8888", 10) );
 
  //set time out
  //dbgTerminal.print("AT+CIPSTO=15 : ");
  //dbgTerminal.println( GetResponse("AT+CIPSTO=15",10) );
  
   //print the ip addr
  dbgTerminal.print(F("ip address : "));
  dbgTerminal.println( GetResponse("AT+CIFSR", 10) );
  delay(200);

   
  dbgTerminal.println();
  dbgTerminal.println(F("Start Webserver"));

  digitalWrite(ledPin,ledState);  
}

void loop() {
  int ch_id, packet_len;
  char *pb;  
  espSerial.readBytesUntil('\n', buffer, BUFFER_SIZE);
  
  if(strncmp(buffer, "+IPD,", 5)==0) {
    // request: +IPD,ch,len:data
    sscanf(buffer+5, "%d,%d", &ch_id, &packet_len);
    if (packet_len > 0) {
      // read serial until packet_len character received
      // start from :
      pb = buffer+5;
      while(*pb!=':') pb++;
      pb++;
      if (strncmp(pb, "GET /led", 8) == 0) {
        dbgTerminal.print(millis());
        dbgTerminal.print(" : ");
        dbgTerminal.println(buffer);
        dbgTerminal.print( "get led from ch :" );
        dbgTerminal.println(ch_id);
 
        delay(100);
        clearSerialBuffer();
        
       if (ledState == LOW)
          ledState = HIGH;
       else
          ledState = LOW;
        digitalWrite(ledPin, ledState);
        
        homepage(ch_id);

      } else if (strncmp(pb, "GET / ", 6) == 0) {
        dbgTerminal.print(millis());
        dbgTerminal.print(" : ");
        dbgTerminal.println(buffer);
        dbgTerminal.print( "get Status from ch:" );
        dbgTerminal.println(ch_id);
        
        delay(100);
        clearSerialBuffer();

        homepage(ch_id);
      }
    }
  }
  clearBuffer();
}

void homepage(int ch_id) {
  String Header;

  Header =  "HTTP/1.1 200 OK\r\n";
  Header += "Content-Type: text/html\r\n";
  Header += "Connection: close\r\n";  
  //Header += "Refresh: 5\r\n";
  
  String Content;
  Content = "D";
  Content += String(ledState);
  
  Header += "Content-Length: ";
  Header += (int)(Content.length());
  Header += "\r\n\r\n";
  
  
  espSerial.print("AT+CIPSEND=");
  espSerial.print(ch_id);
  espSerial.print(",");
  espSerial.println(Header.length()+Content.length());
  delay(10);
  
  // for debug buffer serial error
  //while (espSerial.available() >0 )  {
  //  char c = espSerial.read();
  //  dbgTerminal.write(c);
  //  if (c == '>') {
  //      espSerial.print(Header);
  //      espSerial.print(Content);
  //  }
  //}
  
  if (espSerial.find(">")) {
      espSerial.print(Header);
      espSerial.print(Content);
      delay(10);
   }
 
//  Serial1.print("AT+CIPCLOSE=");
//  Serial1.println(ch_id);


}



// Get the data from the WiFi module and send it to the debug serial port
String GetResponse(String AT_Command, int wait){
  String tmpData;
  
  espSerial.println(AT_Command);
  delay(10);
  while (espSerial.available() >0 )  {
    char c = espSerial.read();
    tmpData += c;
    
    if ( tmpData.indexOf(AT_Command) > -1 )         
      tmpData = "";
    else
      tmpData.trim();       
          
   }
   return tmpData;
}

boolean hardReset() {
  String tmpData;
  
  digitalWrite(ESP8266_CHPD,LOW);
  delay(100);
  digitalWrite(ESP8266_CHPD,HIGH);
  delay(1000);
    
  while ( espSerial.available() > 0 ) {
    char c = espSerial.read();
    tmpData +=c;
    espSerial.write(c);
    if ( tmpData.indexOf("Ready") > -1 ) {
      //Serial.println("Ready");
        clearBuffer();
        return 1;
    } 
  }
}

void clearSerialBuffer(void) {
       while ( espSerial.available() > 0 ) {
         espSerial.read();
       }
}

void clearBuffer(void) {
       for (int i =0;i<BUFFER_SIZE;i++ ) {
         buffer[i]=0;
       }
}
         
boolean connectWiFi(String NetworkSSID,String NetworkPASS) {
  String cmd = "AT+CWJAP=\"";
  cmd += NetworkSSID;
  cmd += "\",\"";
  cmd += NetworkPASS;
  cmd += "\"";
  
  dbgTerminal.println(cmd); 
  dbgTerminal.println(GetResponse(cmd,10));
}

Thanks for sharing this! This is exactly what I was looking for!
I'm running this code on my arduino nano, and as long as there's a single client everything works great.
Whenever I connect from two (or more) different clients it works for a little while and then stops responding. Usually closing all web browsers and re-opening the url seems to work, but sometimes a full reset (for the arduino) is needed. What can be the problem?

Thanks again!

Has anyone figured out if this thing can act as a SSL web server? I have found information of SSL support, but no any real information as to if it can act like a web server with SSL support.

Hi! This example brings the lights on all my doubts!!! there's just one thing i'm trying to achieve and is not working for now. How can i get only the "command" itself passed by the url?
For Example, i can i trim the buffer char array to get only the word "led" ?
I replaced the following line : while(_pb!=':') pb++; with this line : while(_pb!='/') pb++;
so now, i can print the following statement : "led HTTP/1.1" . But i'd like to get rid of the final part " HTTP/1.1"
Sorry if my question sound just stupid but i'm a newbye and i cannot undestand the code entirely
Thank you so much for this great example!

Which version of firmware needs to work? (Awesome work)

Hi everyone,
I have arduino leonardo and the code works fine to me. I have connected a temperature sensor and works fine with all together. Now i want to show in homepage more the data from sensor. How can i edit the code?

Hi all, I have just compiled this code to lenardo with esp8266, it's great. But I don't know how i run a html to control led via wifi. Every boddy please help me. I'm stater..