ip_napt_enable_no defined in lwip/lwip_napt.h, but not there in precompiled lib

[sekarpdkt]

Board

All ESP32 modules

Device Description

ESP-WROOM-32

Hardware Configuration

Issue with enabling NAPT

Version

v2.0.2

IDE Name

Arduino IDE

Operating System

UBUNTU

Flash frequency

40Mhz

PSRAM enabled

no

Upload speed

115200

Description

Looks like, even though in lwip/lwip_napt.h, function void ip_napt_enable_no(u8_t number, int enable); is defined, actual implementation is missing. So while compiling the code, getting undefined reference error

Sketch

I included following define directives and headers

#define CONFIG_LWIP_IP_FORWARD 1
#define CONFIG_LWIP_IPV4_NAPT 1
#define CONFIG_LWIP_L2_TO_L3_COPY 1
#define PROTO_TCP 6
#define PROTO_UDP 17

#include "lwipopts.h"
#include "lwip/opt.h"
#include "lwip/err.h"
#include "lwip/sys.h"
#include "lwip/ip4_addr.h"
#include "lwip/lwip_napt.h"
#include "lwip/ip4_napt.h"

Code that enables NAT

/**
 * Enable/Disable NAPT for a specified interface.
 *
 * @param netif number of the interface: 0 = STA, 1 = AP
 * @param enable non-zero to enable NAPT, or 0 to disable.
 */
ip_napt_enable_no(0, 1);
ip_napt_enable_no(1, 1);

### Debug Message

```plain
Getting following error:


undefined reference to `ip_napt_enable_no'

### Other Steps to Reproduce

_No response_

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

- [X] I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[Jason2866]

Yes this is not set in the sdkonfig for the compiled libs used here.
I have set and it should work in my forked build. You can download from https://github.com/Jason2866/esp32-arduino-lib-builder/releases/download/729/framework-arduinoespressif32-v4.4_dev-d3c108c910.tar.gz

[sekarpdkt]

I just copied all files from /framework-arduinoespressif32/tools/sdk/esp32/lib/ from downloaded gz to ~/.arduino15/packages/esp32/hardware/esp32/2.0.2/tools/sdk/esp32/lib/. Getting new error.

undefined reference to `_printf_float'
undefined reference to `_scanf_float'

Do I need to do something else?

[sekarpdkt]

I copied two lib files liblwip.a & libvfs.a. Code got compiled. Still unable to get the NAT to work. ESP connected to AP with 192.168.4.x address is unable to reach nodes connected to router directly (192.168.1.x)

[Jason2866]

You have to copy ALL files. NAPT is working. We use it as wifi range extender.

[sekarpdkt]

It worked if I try ip_napt_enable(WiFi.softAPIP(), 1); and not for ip_napt_enable_no(1, 1);. Is it mandatory to enable it for softAPIP()?

[VojtechBartoska]

Hello, is this still valid @sekarpdkt?

[Jason2866]

@VojtechBartoska yes, since the Options are not set in sdkconfig used by Arduino Lib builder.