#include <WiFiClientSecure.h>
//#include <WiFiClientSecureAxTLS.h>
//using namespace axTLS;
#include <base64.h>
#include "Mail.h"
#define NDEBUG
static inline bool checkResponse(const String& response, int16_t code) {
return response.startsWith(String(code) + ' ');
}
static bool checkResponse(const String& response, int16_t code, const String& errorMsg) {
bool result = checkResponse(response, code);
if (! result) {
Serial.print(errorMsg);
Serial.print(F(": \""));
if (response.endsWith(F("\r\n")))
Serial.print(response.substring(0, response.length() - 2));
else
Serial.print(response);
Serial.println(F("\"!"));
}
return result;
}
static String getLine(WiFiClient& client) {
String result;
if (client.connected())
result = client.readStringUntil('\n');
#ifndef NDEBUG
Serial.print(F("<<"));
Serial.println(result);
#endif
return result;
}
static void sendLine(WiFiClient& client, const String& str) {
#ifndef NDEBUG
Serial.print(F(">>"));
Serial.println(str);
#endif
if (client.connected())
client.println(str);
}
static String sendCommand(WiFiClient& client, const String& str) {
sendLine(client, str);
client.flush();
return getLine(client);
}
bool sendMail(const String& smtpHost, uint16_t smtpPort, const String& smtpUser, const String& smtpPassword, const String& mailTo, const String& mailSubject, const String& mailMessage) {
WiFiClientSecure client;
String str;
Serial.print(F("Connecting to "));
Serial.println(smtpHost);
// client.setInsecure();
if (! client.connect(smtpHost.c_str(), smtpPort)) {
Serial.println(F("Connection failed!"));
return false;
}
client.setTimeout(15000); // 15 sec. read timeout
str = getLine(client);
if (! checkResponse(str, 220, F("SMTP connection error")))
return false;
str = sendCommand(client, F("HELO esp8266.local"));
if (! checkResponse(str, 250, F("SMTP HELO error")))
return false;
if (smtpPassword.length()) {
str = sendCommand(client, F("AUTH LOGIN"));
if (! checkResponse(str, 334, F("SMTP AUTH error")))
return false;
str = sendCommand(client, base64::encode(smtpUser));
if (! checkResponse(str, 334, F("SMTP AUTH USER error")))
return false;
str = sendCommand(client, base64::encode(smtpPassword));
if (! checkResponse(str, 235, F("SMTP AUTH PASS error")))
return false;
}
str = F("MAIL FROM: <");
str += smtpUser;
str += '>';
str = sendCommand(client, str);
if (! checkResponse(str, 250, F("SMTP MAIL FROM error")))
return false;
str = F("RCPT TO: <");
str += mailTo;
str += '>';
str = sendCommand(client, str);
if (! checkResponse(str, 250, F("SMTP RCPT TO error")))
return false;
str = sendCommand(client, F("DATA"));
if (! checkResponse(str, 354, F("SMTP DATA error")))
return false;
str = F("Subject: =?utf-8?B?");
str += base64::encode(mailSubject);
str += F("=?=");
sendLine(client, str);
sendLine(client, F("MIME-Version: 1.0"));
sendLine(client, F("Content-type: text/plain; charset=utf-8"));
str = F("From: <");
str += smtpUser;
str += '>';
sendLine(client, str);
str = F("To: <");
str += mailTo;
str += '>';
sendLine(client, str);
sendLine(client, "");
sendLine(client, mailMessage);
str = sendCommand(client, F("\r\n."));
if (! checkResponse(str, 250, F("SMTP send error")))
return false;
sendCommand(client, F("QUIT"));
client.stop();
return true;
}
