Espressif Systems ESP8266 SDK, Beginner'S Manual

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Until there's support for the new OAuth2 protocol on the ESP, we'll have to use the old, less secure method.
Hardware
Connect an LED (+ resistor) to pin 13, as an unread email indicator.
The Code
#include < WiFiClientSecure . h > // Include the HTTPS library
#include < ESP8266WiFi . h > // Include the Wi-Fi library
#include < ESP8266WiFiMulti . h > // Include the Wi-Fi-Multi library
ESP8266WiFiMulti wifiMulti; // Create an instance of the ESP8266WiFiMulti class, called 'wifiMulti'
const char * host = "mail.google.com" ; // the Gmail server
const char * url = "/mail/feed/atom" ; // the Gmail feed url
const int httpsPort = 443; // the port to connect to the email server
// The SHA-1 fingerprint of the SSL certificate for the Gmail server (see below)
const char * fingerprint = "D3 90 FC 82 07 E6 0D C2 CE F9 9D 79 7F EC F6 E6 3E CB 8B B3" ;
// The Base64 encoded version of your Gmail login credentials (see below)
const char * credentials = "ZW1haWwuYWRkcmVzc0BnbWFpbC5jb206cGFzc3dvcmQ=" ;
const byte led = 13;
void setup () {
Serial . begin (115200); // Start the Serial communication to send messages to the computer
delay (10);
Serial . println ( '\n' );
pinMode (led , OUTPUT );
wifiMulti . addAP( "ssid_from_AP_1" , "your_password_for_AP_1" ); // add Wi-Fi networks you want to connect to
wifiMulti . addAP( "ssid_from_AP_2" , "your_password_for_AP_2" );
wifiMulti . addAP( "ssid_from_AP_3" , "your_password_for_AP_3" );
Serial . println ( "Connecting ..." );
int i = 0;
while (wifiMulti . run () != WL_CONNECTED) { // Wait for the Wi-Fi to connect: scan for Wi-Fi networks, and connect to the strongest of
the networks above
delay (250);
Serial . print ( '.' );
}
Serial . println ( '\n' );
Serial . print ( "Connected to " );
Serial . println ( WiFi . SSID ()); // Tell us what network we're connected to
Serial . print ( "IP address:\t" );
Serial . println ( WiFi . localIP ()); // Send the IP address of the ESP8266 to the computer
Serial . println ( '\n' );
}
void loop () {
int unread = getUnread();
if (unread == 0) {
Serial . println ( "\r\nYou've got no unread emails" );
digitalWrite (led , LOW );
} else if (unread > 0) {
Serial . printf ( "\r\nYou've got %d new messages\r\n" , unread);
digitalWrite (led , HIGH );
} else {
Serial . println ( "Could not get unread mails" );
}
Serial . println ( '\n' );
delay (5000);
}
int getUnread() { // a function to get the number of unread emails in your Gmail inbox
WiFiClientSecure client ; // Use WiFiClientSecure class to create TLS (HTTPS) connection
Serial . printf ( "Connecting to %s:%d ... \r\n" , host , httpsPort);
if ( ! client . connect (host , httpsPort)) { // Connect to the Gmail server, on port 443
Serial . println ( "Connection failed" ); // If the connection fails, stop and return
return - 1;
}
if ( client . verify(fingerprint , host)) { // Check the SHA-1 fingerprint of the SSL certificate
Serial . println ( "Certificate matches" );