Tasmota/sonoff/sendemail.h

#ifndef __SENDEMAIL_H
#define __SENDEMAIL_H

//#define DEBUG_EMAIL_PORT

//#include <WiFiClient.h>
//#include <WiFiClientSecure.h>
#include <base64.h>
//#include <core_version.h>

#include "WiFiClientSecureLightBearSSL.h"

class SendEmail
{
  private:
    const String host;
    const int port;
    const String user;
    const String passwd;
    const int timeout;
    const bool ssl;
    const int auth_used;
#if defined(ARDUINO_ESP8266_RELEASE_2_3_0) || defined(ARDUINO_ESP8266_RELEASE_2_4_2)
    WiFiClient* client;
#else
    // use bear ssl
    BearSSL::WiFiClientSecure_light *client;
#endif
    String readClient();
    void a3_to_a4(unsigned char * a4, unsigned char * a3);
    int base64_encode(char *output, const char *input, int inputLen);
  public:
   SendEmail(const String& host, const int port, const String& user, const String& passwd, const int timeout, const int auth_used);
   bool send(const String& from, const String& to, const String& subject, const String& msg);
   ~SendEmail() {client->stop(); delete client;}
};

#endif