Manual recompile not necessary?

[gsicilia82]

Hi, after failing few times by manually recompile Arduino-SDK with enabled LWIP-NAT, I have asked ChatGPT.

It told me to use this platformio.ini:

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps = 
    esp32wifi
build_flags = 
    -DLWIP_FEATURES=1
    -DLWIP_IPV4_NAT=1

ChatGPTs C++ code was bullshit, but replacing it with your example file: IT WORKS!
Using these build flags, your example script works out of the box. I don't really understand, why it works without issues by using standard arduino sdk.

Do you know why?

[gsicilia82]

Hmm, ok it works also without any build flags....
Maybe, LWIP NAT is uncluded in standard arduino SDK?

[paclema]

Hi @gsicilia82, thank you for your comments! At the time that I made this example, the lwip nat layer was not totally available by default yet into the esp-idf compiled core that arduino-esp32 is based on.

If it works for you, it might be then included now then :)

I will check that out further and I will let you know, but I am happy that you made it works out of the box.

[paclema]

Hi @gsicilia82 I have been testing this repo example using your platofmio.ini but for me the ip_napt_enable() function is not available using the standard arduino-esp32 framework.

Could you share what are the exact program that you had run that works for you, please?

[gsicilia82]

To be sure that my arduino framework still coresponds to original distribution, how can I "reset" my data and start by null?

Attached, you will find my platformio.ini.
Maybe, the tasmota distribution has napt/lwip already included? I always use tasmota distro cause of esp32 solo1 framework.

[platformio]
default_envs = esp32debug
build_cache_dir = /home/giuseppe/.buildcache
extra_configs = platformio_override.ini

[env]
lib_compat_mode = strict

[common]
lib_deps = 
build_flags = 
	-D DEBUG

[env:esp32]
platform = https://github.com/tasmota/platform-espressif32/releases/download/v.2.0.5/platform-espressif32-v.2.0.5.zip
platform_packages = 
framework = arduino
board = esp32dev
check_tool = cppcheck
lib_deps = ${common.lib_deps}
monitor_speed = 115200
upload_speed = 1500000
lib_ldf_mode = deep
monitor_filters = 
	esp32_exception_decoder
	time
build_unflags = 
build_flags = ${common.build_flags}


[env:esp32debug]
platform = https://github.com/tasmota/platform-espressif32/releases/download/v.2.0.5/platform-espressif32-v.2.0.5.zip
platform_packages = 
framework = arduino
board = esp32dev
check_tool = cppcheck
lib_deps = ${common.lib_deps}
monitor_speed = 115200
monitor_port = /dev/ttyUSB1
debug_tool = esp-prog
debug_init_break = tbreak setup
upload_port = /dev/ttyUSB1
lib_ldf_mode = deep
monitor_filters = 
	esp32_exception_decoder
	time
build_unflags = 
build_type = debug
build_flags = ${common.build_flags}
#upload_protocol = esp-prog
#debug_port = /dev/ttyUSB0

[paclema]

Thanks for your answer @gsicilia82! I am afraid that this is the case. Tasmota platform has its own arduino-esp32 version where they have compiled esp-idf adding the NAPT features by default (not enabled in the espressif official arduino-esp32 framework) in the same way that I explain in the readme of this repo. So in your case you are not using the official arduino-esp32 framework distributed from espressif but the Tasmota version, which already include LWIP-NAPT capabilities.

You can also check more details about this on this issue: espressif/arduino-esp32#6421

Using platformio, the arduino-esp32 framework will be downloaded under the folder .platormio/packages/framework-arduinoespressif32 inside your user home folder. You can remove manually that folder if you want to make platformio download it again the next time that you compile your program.

[gsicilia82]

Thanks for your effort to clarify this topic. In this case, I am pretty sure that your test with original framework and not working lwip napt coresponds to real/original behaviour.
With solo1 project, I started to use tasmota distribution and I continued this way cause of stable results. I never thought about other side effects.

[paclema]

Thank you for your feedback too! I guess we must wait until this feature is included in espressif´s framework with this PR: espressif/esp32-arduino-lib-builder#69, but in your case, it makes sense to use tasmota´s ;)

I close this issue since I guess this has been clarified.