WiFiManager and Wemos d1 esp8266 sending mail problem

[claudacate]

Total newbie here. I just can’t figure out why I can’t connect to the smtp server. I have used the app password. Can someone take a look for me? here is my code. Thanks for the assist

#include <WiFiClient.h> 
#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
#include <TimeLib.h> 
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <strings_en.h>
#include <ESP8266mDNS.h>

#include <ESP_EEPROM.h>
#include "Arduino.h"
//wifi,email, internet
#include <EMailSender.h>
//#include <ArduinoJson.h>
//
#include "mainPage.h"
#include <Wire.h>
#include <Beastdevices_INA3221.h>

//Wifi setting

#define AP_SSID "custom" // custom filter roller SSID
#define AP_PWD  "1234567890"      // custom passowrd

ESP8266WebServer server(80);
WiFiManager wm;                 

char email_to[32] = "";
char email_login[32] = "";   //these are stored in EEPROM after input from web
char email_password[32] = "";

EMailSender emailSend(email_login, email_password);    
void setup() {
 
  EEPROM.begin (120);
 
  
//Wifi setup
  WiFi.mode(WIFI_STA); //set wifi toSTA；default STA+AP
  wm.setConfigPortalBlocking(false);
  wm.setConfigPortalTimeout(60);

    //automatically connect using saved credentials if they exist
    //If connection fails it starts an access point with the specified name
  // check if stored connection info is correct
  if (wm.autoConnect(AP_SSID, AP_PWD)) {
    Serial.println("\Connection data is correct！");
     Serial.println(WiFi.localIP());
  } else {
    Serial.println("\Connection data is incorrect…");
  }

//wm.startConfigPortal();

 
EMailSender::EMailMessage message;
    message.subject = "Float sensor may be stuck";
    message.message = "Float sensor may be stuck, motor disabled until float sensor is resetted";
    EMailSender::Response resp = emailSend.send(email_to, message);
    Serial.println("Sending status: ");
    Serial.println(resp.status);
    Serial.println(resp.code);
    Serial.println(resp.desc);
};

• This topic was modified 2 years, 2 months ago by Renzo Mischianti.

[Renzo Mischianti]

Hi Claudacate,
can you send me the Serial output, the name of the provider and I must verify If WiFiManager set the DNS also or like some time ago It has a problem with the setting of DNS.

How to manage dynamic WIFI configuration on esp8266 or esp32

Bye Renzo

[claudacate]

Thank you for replying. I think WifiManager set the DNS, but I am not sure. I will read up on the link you provided. Here is the serial output:

wm:[1] AutoConnect: SUCCESS
*wm:[1] STA IP Address: 192.168.88.217
Connection data is correct！
192.168.88.217
HTTP server started
ONLY ONE RECIPIENTmiltiple destination and attachments
Insecure client:0
smtp.gmail.com
465
Sending status:
0
2
Could not connect to mail server

[claudacate]

I read your link. I did not use your version of the Wi-Fimanager library. I think that is the problem. Do I just swap the whole library? Or should I change a file? Thanks

[Renzo Mischianti]

Hi Claudcate,
wait, first try to send an email with standard WiFi management.
Give me a feedback.
Bye Renzo

[claudacate]

I used the standard WiFi management and EMailSenderEsp8266GMailTest.ino and still I can’t get a connection. Here is the serial monitor output. Hopefully you can make sense of it. Thank you

Connecting to Tea King
…………….
Connection: ESTABLISHED
Got IP address: 192.168.88.217
ONLY ONE RECIPIENTmiltiple destination and attachments
Insecure client:0
smtp.gmail.com
465
Sending status:
0
2
Could not connect to mail server

[Renzo Mischianti]

Hi, claudcate,
try to do a telnet to
smtp.gmail.com 465
so you can check if you have a firewall that blocks your outgoing connection.

Bye Renzo

[claudacate]

Hi, I have tried the following. 1. I have used my iPhone’s hotspot as a wifi source since my home network may have possible network problem such as firewall. Result: same error as before. 2. I have spoofed my email address to see if I get different error code. Result: same error as before. 3. telnet to smtp.gmail.com 25 result: telnet smtp.gmail.com 25
Trying 142.251.8.108…
Connected to smtp.gmail.com.
Escape character is ‘^]’.
220 smtp.gmail.com ESMTP z11-20020a17090a1fcb00b001bc58804974sm5738172pjz.27 – gsmtp

4. telnet to smtp.gmail.com 465. Result: telnet smtp.gmail.com 465
Trying 142.251.8.108…
Connected to smtp.gmail.com.
Escape character is ‘^]’.
Connection closed by foreign host.

[claudacate]

However, upon further research. It seems port 465 requires SSL to connect. I used openssl and below is result. I think I am missing SSL in the code
openssl s_client -connect smtp.gmail.com:465
CONNECTED(00000005)
depth=3 C = BE, O = GlobalSign nv-sa, OU = Root CA, CN = GlobalSign Root CA
verify return:1
depth=2 C = US, O = Google Trust Services LLC, CN = GTS Root R1
verify return:1
depth=1 C = US, O = Google Trust Services LLC, CN = GTS CA 1C3
verify return:1
depth=0 CN = smtp.gmail.com
verify return:1

Here is the EMailSenderEsp8266GMailTest.ino I used

#include "Arduino.h"
#include <EMailSender.h>
#include <ESP8266WiFi.h>

const char *ssid = "hotspot";
const char *password = "12345678";

uint8_t connection_state = 0;
uint16_t reconnect_interval = 10000;

EMailSender emailSend("sendemailfrom@gmail.com", "passworddfdf");

uint8_t WiFiConnect(const char *nSSID = nullptr,
		const char *nPassword = nullptr) {
	static uint16_t attempt = 0;
	Serial.print("Connecting to ");
	if (nSSID) {
		WiFi.begin(nSSID, nPassword);
		Serial.println(nSSID);
	}

	uint8_t i = 0;
	while (WiFi.status() != WL_CONNECTED && i++ < 50) {
		delay(200);
		Serial.print(".");
	}
	++attempt;
	Serial.println("");
	if (i == 51) {
		Serial.print("Connection: TIMEOUT on attempt: ");
		Serial.println(attempt);
		if (attempt % 2 == 0)
			Serial.println(
					"Check if access point available or SSID and Password\r\n");
		return false;
	}
	Serial.println("Connection: ESTABLISHED");
	Serial.print("Got IP address: ");
	Serial.println(WiFi.localIP());
	return true;
}

void Awaits() {
	uint32_t ts = millis();
	while (!connection_state) {
		delay(50);
		if (millis() > (ts + reconnect_interval) && !connection_state) {
			connection_state = WiFiConnect();
			ts = millis();
		}
	}
}

void setup() {
	Serial.begin(115200);

	connection_state = WiFiConnect(ssid, password);
	if (!connection_state) // if not connected to WIFI
		Awaits(); // constantly trying to connect

	EMailSender::EMailMessage message;
	message.subject = "Soggetto";
	message.message = "Ciao come stai<br>io bene.<br>www.mischianti.org";

	EMailSender::Response resp = emailSend.send("hcubeh@yahoo.com", message);

	Serial.println("Sending status: ");

	Serial.println(resp.status);
	Serial.println(resp.code);
	Serial.println(resp.desc);
}

void loop() {

}

[claudacate]

I found my mistake! When I read the tutorial I followed the instruction for esp8266 core 2.4.2 and changed the emailsenderkey.h. I feel silly. Sorry I took up so much your time Renzo. Thanks again for your help.

[claudacate]

I know this is not part of your library, but was wondering if you can help. I recorded my email and password in EEProm, but when the value are used to login I can’t login. However, if I placed the value like char email_login[32]= “claudacate@gmail.com” I’d have no problem. I serial print out the value they looked identical. Here is what I used to update my email and password. Thank you

		char email_login[32];
		char email_password[32];

		void loademail() {
			EEPROM.get(0, email_to);
			EEPROM.get(0 + sizeof(email_to), email_login);
			EEPROM.get(0 + sizeof(email_to) + sizeof(email_login),
					email_password);
			char ok[3];
			EEPROM.get(
					0 + sizeof(email_to) + sizeof(email_login)
							+ sizeof(email_password), ok);
			if (String(ok) != String(“OK”)) {
				email_to[0] = 0;
				email_login[0] = 0;
				email_password[0] = 0;
			}
		}

		void saveemail() {
			EEPROM.put(0, email_to);
			EEPROM.put(0 + sizeof(email_to), email_login);
			EEPROM.put(0 + sizeof(email_to) + sizeof(email_login),
					email_password);
			char ok[3] = “OK”;
			EEPROM.put(
					0 + sizeof(email_to) + sizeof(email_login)
							+ sizeof(email_password), ok);
			EEPROM.commit();

		}

[Renzo Mischianti]

Hi Claudecate,
probably there are spaces added to the end of string to grow all byte array length

Try something similar to

int writeStringToEEPROM(int addrOffset, const String &strToWrite)
{
  byte len = strToWrite.length();
  EEPROM.write(addrOffset, len);
  for (int i = 0; i < len; i++)
  {
    EEPROM.write(addrOffset + 1 + i, strToWrite[i]);
  }
  return addrOffset + 1 + len;
}
int readStringFromEEPROM(int addrOffset, String *strToRead)
{
  int newStrLen = EEPROM.read(addrOffset);
  char data[newStrLen + 1];
  for (int i = 0; i < newStrLen; i++)
  {
    data[i] = EEPROM.read(addrOffset + 1 + i);
  }
  data[newStrLen] = '\0'; 
  *strToRead = String(data);
  return addrOffset + 1 + newStrLen;
}

where the addrOffset is the start of eeprom and you can use String variable

String user = "ciccio";
String password = "passwd";
writeStringToEEPROM(0, user);
writeStringToEEPROM(32, password);

and to read

String user;
String password;
readStringFromEEPROM(0, &user);
readStringFromEEPROM(32, &password);

Bye Renzo

[Renzo Mischianti]

Hi Claudacate,
I do a lot of tests (with core 2.7 and 3.0), but no problem with WeMos D1.

Do you have to change some settings on EMailSenderKey?

Bye Renzo

[Renzo Mischianti]

Ahhh ok..
Too late 😛

[claudacate]

Thank you for your help. I really appreciate it.

However,when I change the variable from char to String, I’d get error message

testemail:14:50: error: no matching function for call to ‘EMailSender::EMailSender(String&, String&)’
14 | EMailSender emailSend(email_login, email_password);

[Renzo Mischianti]

Try

EMailSender emailSend(email_login.c_str(), email_password.c_str());

Bye Renzo

[Author]

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