ethernet object does not have a dnsIP method.

[nopnop2002]

Basic Infos

• [x] This issue complies with the issue POLICY doc.
• [x] I have read the documentation at readthedocs and the issue is not addressed there.
• [x] I have tested that the issue is present in current master branch (aka latest git).
• [x] I have searched the issue tracker for a similar issue.
• [ ] If there is a stack dump, I have decoded it.
• [x] I have filled out all fields below.

Platform

• Hardware: [ESP-12 device]
• Core Version: [Core:3.1.2]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Wemos D1 mini r2]
• Flash Mode: [qio]
• Flash Size: [4MB]
• lwip Variant: [v1.4]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

The WiFi object has a dnsIP method.

The ethernet object does not have a dnsIP method.

MCVE Sketch

#include <SPI.h>
#include <ESP8266WiFi.h>
#include <W5500lwIP.h>
//#include <W5100lwIP.h>
//#include <ENC28J60lwIP.h>

#define CSPIN 16

Wiznet5500lwIP eth(CSPIN);
//Wiznet5100lwIP eth(CSPIN);
//ENC28J60lwIP eth(CSPIN);
byte mac[] = {0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02};

void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print(ESP.getFullVersion());
  Serial.println();

  SPI.begin();
  SPI.setBitOrder(MSBFIRST);
  SPI.setDataMode(SPI_MODE0);
  SPI.setFrequency(4000000);

  eth.setDefault(); // use ethernet for default route

  int present = eth.begin(mac);
  if (!present) {
    Serial.println("no ethernet hardware present");
    while(1);
  }

  Serial.print("connecting ethernet");
  while (!eth.connected()) {
    Serial.print(".");
    delay(1000);
  }
  Serial.println();
  Serial.print("ethernet ip address: ");
  Serial.println(eth.localIP());
  Serial.print("ethernet subnetMask: ");
  Serial.println(eth.subnetMask());
  Serial.print("ethernet gateway: ");
  Serial.println(eth.gatewayIP());
  Serial.println(eth.dnsIP());
}

void loop() {
  if (eth.status() == WL_CONNECTED) {
    //Serial.println("Ethernet Connected!");
  } else {
    Serial.println("Ethernet Not Connected!");
  }
  delay(1000);
}

Debug Messages

\\LANDISK-HDL-AA1\disk1\Arduino\ESP8266_Ethernet\connectEthernet\connectEthernet.ino: In function 'void setup()':
connectEthernet:57:22: error: 'using Wiznet5500lwIP = class LwipIntfDev<Wiznet5500>' {aka 'class LwipIntfDev<Wiznet5500>'} has no member named 'dnsIP'
   57 |   Serial.println(eth.dnsIP());
      |                      ^~~~~

[JAndrassy]

it will be in the next version https://github.com/esp8266/Arduino/blob/7e0d20e2b9034994f573a236364e0aef17fd66de/cores/esp8266/LwipIntfDev.h#L103