INADDR_NONE leads to compilation error in Arduino

[SuGlider]

Board

Any (ESP32, ESP32S2, ESP32S3, ESP32C3)

Device Description

Any - it doesn't matter for the issue

Hardware Configuration

Any - it doesn't matter for the issue

Version

latest master (checkout manually)

IDE Name

Any - it doesn't matter for the issue

Operating System

Any - it doesn't matter for the issue

Flash frequency

80MHz

PSRAM enabled

no

Upload speed

115200

Description

It just need to be compiled and the error will be displayed.
Basically IPAddress INADDR_NONE declared in <IPAddress.h> is replaced by an integer due to any network usage in any Arduino sketch. This issue causes a compilation error.

Sketch

// If it DOESN'T include any Network header file, it works perfectly well! 
// But it makes no sense to do that and use INADDR_NONE...
#include <WiFi.h>
// or just include <ETH.h> 

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

  // the code line below causes compilation error
  Serial.printf("INADDR_NONE = [%s]", INADDR_NONE.toString());

  // This piece of code compiles, but outputs trash: "IP_NONE addr = [⸮⸮⸮?�]" 
  // it should output [0.0.0.0] instead!
  IPAddress addr = INADDR_NONE; 
  Serial.printf("\n IP_NONE addr = [%s]\n", addr.toString());
}

void loop() {
}

Debug Message

None - just a compilation error message:

Compiling sketch...

C:\Users\espduino\Documents\Arduino\issue_4073_INADDR_UNDEF\issue_4073_INADDR_UNDEF.ino: In function 'void setup()':
issue_4073_INADDR_UNDEF:48:51: error: request for member 'toString' in '4294967295', which is of non-class type 'u32_t' {aka 'unsigned int'}
   Serial.printf("INADDR_NONE = [%s]", INADDR_NONE.toString());
                                                   ^~~~~~~~
Using library WiFi at version 2.0.0 in folder: C:\Users\espduino\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\libraries\WiFi 
exit status 1
request for member 'toString' in '4294967295', which is of non-class type 'u32_t' {aka 'unsigned int'}

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[SuGlider]

The main issue is that <lwip/inet.h> declares #define INADDR_NONE IPADDR_NONE and it includes <lwip/ip4_addr.h> that declares #define IPADDR_NONE ((u32_t)0xffffffffUL) (IP 255.255.255.255)
When <lwip/inet.h> is included, it makes the Arduino declaration of "IPAddress INADDR_NONE(0,0,0,0)" invalid. This happens in all the Arduino WiFi and ETH libraries.

[VojtechBartoska]

probably related issue #5220 ?

[SuGlider]

probably related issue #5220 ?

Yes, it is possible, once IPADDR_NONE will not work at all in Arduino. I'll verify the issue #5220 as well.

update

I checked the issue #5220. WiFiMuilti.ino example seems to be working correctly with 2.0.2 and 2.0.3-RC1.
Thus, it is not related to #6610 issue.

[SuGlider]

This is another test case used to verify/test this issue and PR Fix:
issue #4732

#include <Arduino.h>
#include <WiFi.h>

void setup() {
  WiFi.begin("Your_SSID", "Your_wifi_password");
  String nodeName = "NODE-" + WiFi.macAddress();
  nodeName.replace(":", "");
  char _nodeName[20]; nodeName.toCharArray(_nodeName, 20);
  WiFi.setHostname(_nodeName);
  WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE);
  WiFi.mode(WIFI_STA);

  log_i("Connected to: ");
  log_i( "%s", WiFi.SSID() );
  log_i( "%s", WiFi.localIP().toString().c_str() );
  log_i( "%s", WiFi.getHostname());
}

void loop() {
}