ESP32 with W5500

[proasnet]

Dear @mobizt , you lock the discussion about ethernet problem.
Apparently it was misunderstood.
Well, that's exactly how I used the example without any modification. Ethernet.h is defined there, as you write, so there is no need to define a class, even so there is a compilation error. Only then, when the compilation failed, I tried to define the class, but the compilation is with the same error.
Then there is an error somewhere, I don't know where, why the example cannot be compiled.

[mobizt]

It bothers the topic owner and other people that talking 2 years ago.
Did you think of this by talking off-topic based on your code error.

[mobizt]

The examples are well tested and all are ok.

You have to check your installed libraries why it can't compile?

The EthernetClient is the class defined in Arduino Ethernet.h.

You also have to read and interpret the compilation error. At least you should remove all Ethernet libraries from your Arduino libraries folder and try again.

[proasnet]

But I don't know where the error is in my code, because it is an example from the library without any changes. I also tried it in Arduino Cloud (online IDE) to see if there is an error in my PC and again with the same error.
I share the your code from cloud, please check it.
https://app.arduino.cc/sketches/4ec0623b-071d-4e94-911b-a620edc6da69?nav=Libraries&view-mode=preview

/run/arduino/sketches/new_sketch_1740395933376/new_sketch_1740395933376.ino:92:1: error: 'EthernetClient' does not name a type; did you mean 'EthernetClass'?
 EthernetClient eth_client;
 ^~~~~~~~~~~~~~
 EthernetClass
/run/arduino/sketches/new_sketch_1740395933376/new_sketch_1740395933376.ino: In function 'void sendEmail()':
/run/arduino/sketches/new_sketch_1740395933376/new_sketch_1740395933376.ino:119:29: error: 'eth_client' was not declared in this scope
     smtp.setEthernetClient(&eth_client, Eth_MAC, WIZNET_CS_PIN, WIZNET_RESET_PIN); // The staIP can be assigned to the fifth param
                             ^~~~~~~~~~
/run/arduino/sketches/new_sketch_1740395933376/new_sketch_1740395933376.ino:119:29: note: suggested alternative: 'eth_link_t'
     smtp.setEthernetClient(&eth_client, Eth_MAC, WIZNET_CS_PIN, WIZNET_RESET_PIN); // The staIP can be assigned to the fifth param
                             ^~~~~~~~~~
                             eth_link_t
Multiple libraries were found for "WiFi.h"
  Used: /run/arduino/directories-data/packages/esp32/hardware/esp32/2.0.17/libraries/WiFi
  Not used: /run/arduino/directories-data/internal/DA16200_Wi-Fi_Library_for_Arduino_1.1.0_9d156d307009fe30
  Not used: /run/arduino/directories-data/internal/VEGA_WiFiNINA_1.0.1_ab2db6059607e9f4
  Not used: /run/arduino/directories-data/internal/NINA-Wi-Fi_1.0.1_8b5f9e1dc71eca55
  Not used: /run/arduino/directories-data/internal/WiFi_1.2.7_c357666d3257ae8a
  Not used: /run/arduino/directories-data/internal/WiFiEspAT_1.5.0_5169a7bcde168205
  Not used: /run/arduino/directories-data/internal/WiFiNINA_1.9.0_14125145f1e94a79
  Not used: /run/arduino/directories-data/internal/Seeed_Arduino_rpcWiFi_1.1.0_a93a349668c69c81
  Not used: /run/arduino/directories-data/internal/BetterWiFiNINA_1.4.1_f1b425a2b2caf410
  Not used: /run/arduino/directories-data/internal/indhilib_3.0.5_645ae16078e566f4
Multiple libraries were found for "SD.h"
  Used: /run/arduino/directories-data/packages/esp32/hardware/esp32/2.0.17/libraries/SD
  Not used: /run/arduino/directories-data/internal/SD_1.3.0_747b208849081a93
Multiple libraries were found for "SPI.h"
  Used: /run/arduino/directories-data/packages/esp32/hardware/esp32/2.0.17/libraries/SPI
  Not used: /run/arduino/directories-data/internal/EventEthernet_1.0.0_bd9dd894ef7641f8

[mobizt]

FYI.
The EthernetClass was defined here.
https://github.com/arduino-libraries/Ethernet/blob/master/src/Ethernet.h#L74

The header files inclusion order in your sketch is wrong and it's not actually pure library provided example code.

You have to remove this from the stupid Arduino Web IDE auto generation code.

#include <ESP_Mail_Client.h>
#include <ESP_Mail_Client_Version.h>
#include <ESP_Mail_Const.h>
#include <ESP_Mail_Error.h>
#include <ESP_Mail_FS.h>
#include <ESP_Mail_IMAP.h>
#include <ESP_Mail_SMTP.h>
#include <ESP_Mail_TCPClient.h>
#include <HeapStat.h>

When I refer to example, you have to follow the library provided examples instead of internet code.

[proasnet]

dear @mobizt
Unfortunately, I'm at my wits end. I can't compile your example successfully.
I installed the IDE, your library on another PC and still the same problem with EthernetClass.
I'm out of ideas. Thanks for trying to help

[mobizt]

I have checked it and found the error only existed in Arduino IDE due to the compiler.

You have to change the order of include files by include the Ethernet.h before ESP_Mail_Client.h , from

#include <ESP_Mail_Client.h>

// https://github.com/arduino-libraries/Ethernet
#include <Ethernet.h>

to

// https://github.com/arduino-libraries/Ethernet
#include <Ethernet.h>

#include <ESP_Mail_Client.h>

This is the way to make some macro that used in this library works under the Arduino IDE.

[proasnet]

dear @mobizt
Thank you, this helped, the compilation was successful.
Must be as you described.

#include <Ethernet.h>
#include <ESP_Mail_Client.h>

[proasnet]

Now I trying an example.
From console I get this error.

06:16:45.640 -> ets Jul 29 2019 12:21:46
06:16:45.640 -> 
06:16:45.640 -> rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
06:16:45.640 -> configsip: 0, SPIWP:0xee
06:16:45.640 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
06:16:45.640 -> mode:DIO, clock div:1
06:16:45.640 -> load:0x3fff0030,len:1344
06:16:45.640 -> load:0x40078000,len:13964
06:16:45.640 -> load:0x40080400,len:3600
06:16:45.640 -> entry 0x400805f0
06:16:45.919 -> 
06:16:45.919 -> #### Error, connection closed
06:16:45.919 -> ! E: connection closed
06:16:45.919 -> Connection error, Status Code: 0, Error Code: -400, Reason: connection closed

I don't think ethernet initialization will happen. In my other code that works on the same HW, I have in setup()
Ethernet.init( 5 );
Where 5 is INT pin for W5500 on ESP32.
Where in your library I define this INT pin?
Thank you.

[mobizt]

Sorry, no INT pin and it is not necessary.

[mobizt]

To initialize the Ethernet client, you must use chip enable/seclect pin instead.

Ethernet.init(<chipSeclectPin>)

[mobizt]

The interrupt pin of your module is not used in SPI bus, you should pull-up it to disable your module interrupt.

[proasnet]

OK. Got it but still can't move next. I keep getting -400 error. Over Wifi, your library send email for the first time. Over ethernet not.
W5500 is connected to ESP32 as
RST-13
CS-5
INIT-4
MOSI-23
MISO-19
SCK-18
Another ethernet programs on my HW working (pubsubclient, modbustcp, webserver)
Please, check next edited example.

#include <Arduino.h>

// https://github.com/arduino-libraries/Ethernet
#include <Ethernet.h>
#include <ESP_Mail_Client.h>

// For using other Ethernet library that works with other Ethernet module,
// the following build flags or macros should be assigned in src/ESP_Mail_FS.h or your Custom_ESP_Mail_FS.h.
// ESP_MAIL_ETHERNET_MODULE_LIB and ESP_MAIL_ETHERNET_MODULE_CLASS
// See src/ESP_Mail_FS.h for detail.

#define SMTP_HOST "report.***.sk"
#define SMTP_PORT 26

#define AUTHOR_EMAIL "***@***.sk"
#define AUTHOR_PASSWORD "***"
#define RECIPIENT_EMAIL "***@***.sk"

#define WIZNET_RESET_PIN 13 // Connect W5500 Reset pin to GPIO 26 of ESP32
#define WIZNET_CS_PIN 5     // Connect W5500 CS pin to GPIO 5 of ESP32
#define WIZNET_MISO_PIN 19  // Connect W5500 MISO pin to GPIO 19 of ESP32
#define WIZNET_MOSI_PIN 23  // Connect W5500 MOSI pin to GPIO 23 of ESP32
#define WIZNET_SCLK_PIN 18  // Connect W5500 SCLK pin to GPIO 18 of ESP32

unsigned long sentMillis = 0;

uint8_t Eth_MAC[] = { 0x00, 0x80, 0x41, 0x19, 0x69, 0x90 };

SMTPSession smtp;

EthernetClient eth_client;

void smtpCallback(SMTP_Status status);

void sendEmail()
{

  Session_Config config;

  config.server.host_name = SMTP_HOST;
  config.server.port = SMTP_PORT;
  config.login.email = "***";
  config.login.password = AUTHOR_PASSWORD;

  config.login.user_domain = F("127.0.0.1");

  SMTP_Message message;

  message.sender.name = F("ESP Mail");
  message.sender.email = AUTHOR_EMAIL;
  message.subject = F("Test sending plain text Email");

  message.addRecipient(F("Someone"), RECIPIENT_EMAIL);

  message.text.content = "This is simple plain text message";

  /* Assign the pointer to global defined Ethernet Client object */
  smtp.setEthernetClient(&eth_client, Eth_MAC, WIZNET_CS_PIN, WIZNET_RESET_PIN ); // The staIP can be assigned to the fifth param

  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.");
  }

  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());

  MailClient.printf("Free Heap: %d\n", MailClient.getFreeHeap());
}

void setup()
{

  Serial.begin(115200);

  Serial.println();
  //pinMode( W5500_RST_PIN , OUTPUT );
  //digitalWrite( W5500_RST_PIN , HIGH );
  smtp.debug(1);

  smtp.callback(smtpCallback);
}

void loop()
{
  if (millis() - sentMillis > 120000 || sentMillis == 0)
  {
    sentMillis = millis();
    sendEmail();
  }
}

void smtpCallback(SMTP_Status status)
{
  Serial.println(status.info());

  if (status.success())
  {
    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++)
    {
      SMTP_Result result = smtp.sendingResult.getItem(i);

      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");
    smtp.sendingResult.clear();
  }
}

09:22:01.461 -> 
09:22:01.461 -> #### Error, connection closed
09:22:01.461 -> ! E: connection closed
09:22:01.461 -> Connection error, Status Code: 0, Error Code: -400, Reason: connection closed

[proasnet]

Yes, exactly as you write. Is it possible to configure your library ESP email client for not not maintain the network connection? If so, how do I achieve this?

[mobizt]

It maintains only WiFi reconnection and can be disabled.

For other networks, it is just initializing the hardware only to make sure the network client is setup properly, no re-connection when your network/device failed.

In your case, EthernetClient library may not functioning with your module.

[proasnet]

I will try if possible. Please tell me how to set the library to not control and maintain the connection client, for both wifi or ethernet.
Thank you very much.

[mobizt]

For other networks, it is just initializing the hardware only to make sure the network client is setup properly, no re-connection when your network/device failed.

That includes Ethernet.

For generic network (unknown).
https://github.com/mobizt/ESP-Mail-Client/blob/master/examples/SMTP/External_Client/Generic/Generic.ino

[mobizt]

To disable network reconnection (only ESP32/ESP8266 WiFi have this feature).

MailClient.networkReconnect(false);

Ethernet/GSM do not have reconnection ability (we will not reset user modem for re-connection, it is user responsibility to solve the problem).