I am tryin to add SMTP emailing to my smart home arduino monitor. I have a sketch that monitors water usage and tank levels and I need it to send me daily summaries as well as alerts on over usage. I tried out ESP-Mail-Client by mobizt - https://github.com/mobizt/ESP-Mail-Client and it works fine. The problem is the basic Send_Enriched_Text sketch uses up 228420 bytes (87%) of my Arduino UNO R4's storage space. My monitor program uses up around 40% of the space so this puts me over the edge. Any suggestions on a lighter SMTP solution or a way to thin down ESP-Mail-Client?
Below is the example code for the Send_Enriched_Text sketch
/**
* Created by K. Suwatchai (Mobizt)
*
* Email: suwatchai@outlook.com
*
* Github: https://github.com/mobizt/ESP-Mail-Client
*
* Copyright (c) 2023 mobizt
*/
// This example shows how to send Email in enriched text version.
/** Note for library update from v2.x.x to v3.x.x.
*
* Struct data names changed
*
* "ESP_Mail_Session" changes to "Session_Config"
* "IMAP_Config" changes to "IMAP_Data"
*
* Changes in the examples
*
* ESP_Mail_Session session;
* to
* Session_Config config;
*
* IMAP_Config config;
* to
* IMAP_Data imap_data;
*/
#include <Arduino.h>
#if defined(ESP32) || defined(ARDUINO_RASPBERRY_PI_PICO_W)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#elif __has_include(<WiFiNINA.h>)
#include <WiFiNINA.h>
#elif __has_include(<WiFi101.h>)
#include <WiFi101.h>
#elif __has_include(<WiFiS3.h>)
#include <WiFiS3.h>
#endif
#include <ESP_Mail_Client.h>
#define WIFI_SSID "<ssid>"
#define WIFI_PASSWORD "<password>"
/** For Gmail, the app password will be used for log in
* Check out https://github.com/mobizt/ESP-Mail-Client#gmail-smtp-and-imap-required-app-passwords-to-sign-in
*
* For Yahoo mail, log in to your yahoo mail in web browser and generate app password by go to
* https://login.yahoo.com/account/security/app-passwords/add/confirm?src=noSrc
*
* To use Gmai and Yahoo's App Password to sign in, define the AUTHOR_PASSWORD with your App Password
* and AUTHOR_EMAIL with your account email.
*/
/** The smtp host name e.g. smtp.gmail.com for GMail or smtp.office365.com for Outlook or smtp.mail.yahoo.com */
#define SMTP_HOST "<host>"
/** The smtp port e.g.
* 25 or esp_mail_smtp_port_25
* 465 or esp_mail_smtp_port_465
* 587 or esp_mail_smtp_port_587
*/
#define SMTP_PORT esp_mail_smtp_port_587
/* The log in credentials */
#define AUTHOR_EMAIL "<email>"
#define AUTHOR_PASSWORD "<password>"
/* Recipient email address */
#define RECIPIENT_EMAIL "<recipient email here>"
/* Declare the global used SMTPSession object for SMTP transport */
SMTPSession smtp;
/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status);
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
WiFiMulti multi;
#endif
void setup()
{
Serial.begin(115200);
#if defined(ARDUINO_ARCH_SAMD)
while (!Serial)
;
#endif
Serial.println();
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
multi.addAP(WIFI_SSID, WIFI_PASSWORD);
multi.run();
#else
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
#endif
Serial.print("Connecting to Wi-Fi");
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
unsigned long ms = millis();
#endif
while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
delay(300);
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
if (millis() - ms > 10000)
break;
#endif
}
Serial.println();
Serial.print("Connected with IP: ");
Serial.println(WiFi.localIP());
Serial.println();
/* Set the network reconnection option */
MailClient.networkReconnect(true);
// The WiFi credentials are required for Pico W
// due to it does not have reconnect feature.
#if defined(ARDUINO_RASPBERRY_PI_PICO_W)
MailClient.clearAP();
MailClient.addAP(WIFI_SSID, WIFI_PASSWORD);
#endif
/** Enable the debug via Serial port
* 0 for no debugging
* 1 for basic level debugging
*
* Debug port can be changed via ESP_MAIL_DEFAULT_DEBUG_PORT in ESP_Mail_FS.h
*/
smtp.debug(1);
/* Set the callback function to get the sending results */
smtp.callback(smtpCallback);
/* Declare the Session_Config for user defined session credentials */
Session_Config config;
/* Set the session config */
config.server.host_name = SMTP_HOST;
config.server.port = SMTP_PORT;
config.login.email = AUTHOR_EMAIL;
config.login.password = AUTHOR_PASSWORD;
/** Assign your host name or you public IPv4 or IPv6 only
* as this is the part of EHLO/HELO command to identify the client system
* to prevent connection rejection.
* If host name or public IP is not available, ignore this or
* use loopback address "127.0.0.1".
*
* Assign any text to this option may cause the connection rejection.
*/
config.login.user_domain = F("127.0.0.1");
/*
Set the NTP config time
For times east of the Prime Meridian use 0-12
For times west of the Prime Meridian add 12 to the offset.
Ex. American/Denver GMT would be -6. 6 + 12 = 18
See https://en.wikipedia.org/wiki/Time_zone for a list of the GMT/UTC timezone offsets
*/
config.time.ntp_server = F("pool.ntp.org,time.nist.gov");
config.time.gmt_offset = 3;
config.time.day_light_offset = 0;
/* Declare the message class */
SMTP_Message message;
/* Set the message headers */
message.sender.name = F("ESP Mail");
message.sender.email = AUTHOR_EMAIL;
message.subject = F("Test sending enriched text Email");
message.addRecipient(F("Someone"), RECIPIENT_EMAIL);
message.text.content = F("This is <bold><italic>enriched </italic></bold> <smaller>as defined in RFC 1896</smaller>\r\n\r\nIsn't it <bigger><bigger>cool?</bigger></bigger>");
message.text.content_type = F("text/enriched");
/** The Plain text message character set e.g.
* us-ascii
* utf-8
* utf-7
* The default value is utf-8
*/
message.text.charSet = F("us-ascii");
/** The content transfer encoding e.g.
* enc_7bit or "7bit" (not encoded)
* enc_qp or "quoted-printable" (encoded)
* enc_base64 or "base64" (encoded)
* enc_binary or "binary" (not encoded)
* enc_8bit or "8bit" (not encoded)
* The default value is "7bit"
*/
message.text.transfer_encoding = Content_Transfer_Encoding::enc_7bit;
/** The message priority
* esp_mail_smtp_priority_high or 1
* esp_mail_smtp_priority_normal or 3
* esp_mail_smtp_priority_low or 5
* The default value is esp_mail_smtp_priority_low
*/
message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_low;
/** The Delivery Status Notifications e.g.
* esp_mail_smtp_notify_never
* esp_mail_smtp_notify_success
* esp_mail_smtp_notify_failure
* esp_mail_smtp_notify_delay
* The default value is esp_mail_smtp_notify_never
*/
// message.response.notify = esp_mail_smtp_notify_success | esp_mail_smtp_notify_failure | esp_mail_smtp_notify_delay;
/* Set the custom message header */
message.addHeader(F("Message-ID: <abcde.fghij@gmail.com>"));
/* Connect to the server */
if (!smtp.connect(&config))
{
MailClient.printf("Connection error, Status Code: %d, Error Code: %d, Reason: %s\n", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());
return;
}
if (!smtp.isLoggedIn())
{
Serial.println("Error, Not yet logged in.");
}
else
{
if (smtp.isAuthenticated())
Serial.println("Successfully logged in.");
else
Serial.println("Connected with no Auth.");
}
/* Start sending Email and close the session */
if (!MailClient.sendMail(&smtp, &message))
MailClient.printf("Error, Status Code: %d, Error Code: %d, Reason: %s\n", smtp.statusCode(), smtp.errorCode(), smtp.errorReason().c_str());
// to clear sending result log
// smtp.sendingResult.clear();
MailClient.printf("Free Heap: %d\n", MailClient.getFreeHeap());
}
void loop()
{
}
/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status)
{
/* Print the current status */
Serial.println(status.info());
/* Print the sending result */
if (status.success())
{
// MailClient.printf used in the examples is for format printing via debug Serial port
// that works for all supported Arduino platform SDKs e.g. SAMD, ESP32 and ESP8266.
// In ESP8266 and ESP32, you can use Serial.printf directly.
Serial.println("----------------");
MailClient.printf("Message sent success: %d\n", status.completedCount());
MailClient.printf("Message sent failed: %d\n", status.failedCount());
Serial.println("----------------\n");
for (size_t i = 0; i < smtp.sendingResult.size(); i++)
{
/* Get the result item */
SMTP_Result result = smtp.sendingResult.getItem(i);
// In case, ESP32, ESP8266 and SAMD device, the timestamp get from result.timestamp should be valid if
// your device time was synched with NTP server.
// Other devices may show invalid timestamp as the device time was not set i.e. it will show Jan 1, 1970.
// You can call smtp.setSystemTime(xxx) to set device time manually. Where xxx is timestamp (seconds since Jan 1, 1970)
MailClient.printf("Message No: %d\n", i + 1);
MailClient.printf("Status: %s\n", result.completed ? "success" : "failed");
MailClient.printf("Date/Time: %s\n", MailClient.Time.getDateTimeString(result.timestamp, "%B %d, %Y %H:%M:%S").c_str());
MailClient.printf("Recipient: %s\n", result.recipients.c_str());
MailClient.printf("Subject: %s\n", result.subject.c_str());
}
Serial.println("----------------\n");
// You need to clear sending result as the memory usage will grow up.
smtp.sendingResult.clear();
}
}
There are some other capabilities of the Giga that would be fun to explore. It still seems like there should be a SMTP solution that doesn't swallow up so much memory