Sending an email with using ESP8266 Wifi module

ESP8266 is a very useful and cheap wifi module to be as client, server and access point.

ESP8266 Quick Starter Guide : http://rancidbacon.com/files/kiwicon8/ESP8266_WiFi_Module_Quick_Start_Guide_v_1.0.4.pdf

!!!BE CAREFUL, ESP8266 WORKS UNDER 3.3 VOLT NOT 5 VOLT!!!

For sending an email, we used our server and PHP code. PHP code file is in the server file system and wifi module makes a connection with the PHP code.

PHP code :

<?php
include('DatabaseConnection.php');
$data=$_GET['data'];
$email=$_GET['email'];
require /*write here php file directory*/;
$mail = new PHPMailer;

//$mail->SMTPDebug = 3;                               // Enable verbose debug output

$mail->isSMTP();                                      // Set mailer to use SMTP
$mail->Host = 'localhost';  // Specify main and backup SMTP servers
$mail->SMTPAuth = true;                               // Enable SMTP authentication
$mail->Username = /*write here SMTP username*/;                 // SMTP username
$mail->Password = /*write here SMTP password*/;                           // SMTP password
//$mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
//$mail->Port = 587;                                    // TCP port to connect to

$mail->From = (/*write here host name*/);
$mail->addAddress($email);               // Name is optional
$mail->WordWrap = 50;     
$mail->isHTML(true);                                  // Set email format to HTML

$mail->Subject = /*write here mail subject*/;
$mail->Body    = /*write here mail message*/;
$mail->AltBody = /*write here altbody*/;

if($mail->send()) {
   $flag['code']=1;
}else{
   $flag['code']=0;
}
print(json_encode($flag));
mysql_close();
?>

Arduino Code :

#include <SoftwareSerial.h>
SoftwareSerial esp8266(10,11); //TX RX
#define DEBUG true

void setup()
{
  Serial.begin(9600); //serial debug
  esp8266.begin(9600); 
  //set mode needed for new boards
  
}

void loop()
{
  
  WebRequest();
  delay(5000);
}

//web request needs to be sent without the http for now, https still needs some working
void WebRequest(){

   String response;
   String cmd = "AT+CIPSTART=4,\"TCP\",\"WRITE HERE HOST NAME\",80\r\n";  //make this command: AT+CPISTART="TCP","146.227.57.195",80
   String val =  "GET /*WRITE HERE FILE NAME OF PHP*/";  //construct http GET request
   String value = "AT+CIPSEND=4,";
   value=value+val.length();
   value=value+"\r\n";
   
  sendData("AT+RST\r\n",2000,DEBUG);
  sendData("AT+CWMODE=1\r\n",1000,DEBUG);
  sendData("AT+RST\r\n",2000,DEBUG);
  sendData("AT+CIPMUX=1",500,DEBUG);
  response=sendData("AT+CWJAP=\"WIFI ACCESS POINT NAME\",\"WIFI ACCESS POINT PASSWORD\"\r\n",2000,DEBUG);
  response=sendData(cmd,2000,DEBUG);
  response = sendData(value,2000,DEBUG);
  sendData(val,5000,DEBUG);
  
}
String sendData(String command, const int timeout, boolean debug)
{
    String response = "";
    
    esp8266.print(command); // send the read character to the esp8266
    
    long int time = millis();
    
    while( (time+timeout) > millis())
    {
      while(esp8266.available())
      {
        
        // The esp has data so display its output to the serial window 
        char c = esp8266.read(); // read the next character.
        response+=c;
      }  
    }
    
    if(debug)
    {
      Serial.println(response);
    }
    
    return response;
}
boolean Contains(String s, String search) {
    int max = s.length() - search.length();

    for (int i = 0; i <= max; i++) {
        if (s.substring(i) == search) return true; // or i
    }

    return false; //or -1
}