'inet_addr_to_ipaddr' was not declared in this scope [SOLVED]

[wieb18]

Thanks a lot for excellent library.

It works fine on ESP32, no compiler error.

Because something wrong on my PC, I did fresh install Windows 10 and Arduino IDE 1.8.8.

But after fresh install, ESP32 Ping doesn't work anymore.

Arduino IDE Compiler error in Ping.cpp line:

inet_addr_from_ipaddr(&to.sin_addr, addr);

The error message: 'inet_addr_to_ipaddr' was not declared in this scope

It seems this error cause by broken lwip library.

ESP32 Ping use 2 separate lwip libraries (Arduino library in C:\Program Files (x86)\Arduino and ESP32 library in C:\Users\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.1\tools\sdk\include\lwip\lwip folder).

But somehow the library connection is broken and cause 'inet_addr_to_ipaddr' was not declared in this scope error

Instead using Board Manager to install ESP32 package, also tried install ESP32 package by using git, but didn't help either. Still 'inet_addr_to_ipaddr' was not declared in this scope error

How to fix this error?

Please help...

[wieb18]

Tried very dumb solution by adding these lines:

#define inet_addr_from_ipaddr 
#define inet_addr_to_ipaddr 

in Ping.cpp.

No compiler error and able upload the sketch into ESP32.

But ping doesn't work because it didn't find inet_addr_from_ipaddr and inet_addr_to_ipaddr functions.

How to fix this?

Please help...

[wieb18]

Done this steps:

1. Uninstall Arduino IDE 1.8.8
2. Delete C:\Users\AppData\Local\
3. Rename C:\Users\Documents\Arduino into C:\Users\Documents\Arduino_OLD
4. Restart the PC
5. Install Arduino IDE 1.8.8
6. Install ESP32 Core version 1.0.0 using Boards Manager

Then.... compile my sketch.

And now.... it WORKS.... :) :) :)

My previous mistake is not installing ESP32 Core version 1.0.0.

I did it by installing version 1.0.1 - the Boards Manager default version - which didn't work.

It seems some change in ESP32 Core version 1.0.1 broke ESP32 Ping library connection.

[atanisoft]

Ping.cpp does not include the header that defines this function, you can alter the library to add the following to fix this likely:

#include <lwip/inet.h>

[bill-orange]

I added #include <lwip/inet.h> to Ping.cpp.. Compilation with Core 1.0.1 resulted in the same error.

[atanisoft]

The "function" is defined in that file, additional code may be required but I don't have this library setup on my system but I do use this function in my own code without issues.

[atanisoft]

a fix for this: PotatoX@4b8688e

[bill-orange]

@atanisoft That works, thanks! I use ping to test for a live internet connection.

[dachshund-digital]

When will PotatoX fix be merged to mater? I am getting the same issue with ESP core 1.0.1 right now.

[dachshund-digital]

Found another bug, typo...

In Ping.cpp... free() call is malformed, missing ";"... throws errors on compile.

if ((err = sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to)))) {
	transmitted++;
}
free(iecho)
return (err ? ERR_OK : ERR_VAL);

[chillitomato]

to make this work for v1.01 just change

inet_addr_from_ipaddr to inet_addr_from_ip4addr
inet_addr_to_ipaddr to inet_addr_to_ip4addr

in file Ping.cpp in your library path

Thats it

[BojanJurca]

The solution that works for me is changing the following lines:

to.sin_addr = *(in_addr *) addr; // inet_addr_from_ipaddr (&to.sin_addr, addr);

fromaddr = *(ip4_addr_t *) &from.sin_addr; // inet_addr_to_ipaddr (&fromaddr, &from.sin_addr);