[2.0.3+] LWIP PPP disabled in sdkconfig/menuconfig

[chegewara]

Board

esp32

Device Description

not important

Hardware Configuration

not important

Version

v2.0.3

IDE Name

platformio

Operating System

linux

Flash frequency

40

PSRAM enabled

no

Upload speed

115200

Description

Maybe i am just using old and outdated esp_modem library, but here is the problem.

• #include "esp_netif_ppp.h"
• this header exist
• declarations of missing functions also exist in this header
• looks like definitions are not compiled

With v2.0.0 everything works fine, but i wanted to migrate to v2.0.3 and onward.
After comparing sdkconfig files i am guessing its because PPP is disabled. Here is diff between sdkconfig.h files:

< 2.0.0 
> 2.0.3
< #define CONFIG_LWIP_MAX_SOCKETS 10
> #define CONFIG_LWIP_MAX_SOCKETS 16
> #define CONFIG_LWIP_DHCP_DISABLE_VENDOR_CLASS_ID 1
> #define CONFIG_LWIP_DHCP_OPTIONS_LEN 128
< #define CONFIG_LWIP_IPV6_RDNSS_MAX_DNS_SERVERS 0
< #define CONFIG_LWIP_PPP_SUPPORT 1
< #define CONFIG_LWIP_PPP_ENABLE_IPV6 1
< #define CONFIG_LWIP_PPP_PAP_SUPPORT 1
< #define CONFIG_LWIP_PPP_CHAP_SUPPORT 1
< #define CONFIG_LWIP_PPP_MSCHAP_SUPPORT 1
< #define CONFIG_LWIP_PPP_MPPE_SUPPORT 1
> #define CONFIG_LWIP_SNTP_MAX_SERVERS 3
> #define CONFIG_LWIP_DHCP_GET_NTP_SRV 1
< #define CONFIG_PPP_CHAP_SUPPORT CONFIG_LWIP_PPP_CHAP_SUPPORT
< #define CONFIG_PPP_MPPE_SUPPORT CONFIG_LWIP_PPP_MPPE_SUPPORT
< #define CONFIG_PPP_MSCHAP_SUPPORT CONFIG_LWIP_PPP_MSCHAP_SUPPORT
< #define CONFIG_PPP_PAP_SUPPORT CONFIG_LWIP_PPP_PAP_SUPPORT
< #define CONFIG_PPP_SUPPORT CONFIG_LWIP_PPP_SUPPORT
> #define CONFIG_WIFI_LWIP_ALLOCATION_FROM_SPIRAM_FIRST CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP

Now the question is, is it considered as a bug or is it on purpose, so i knew what to do with it next.

Thanks

sdkconfig-2.0.0.txt
sdkconfig-2.0.3.txt

Sketch

too big project, cant deliver small sketch

Debug Message

/home/chegewara/.platformio/packages/toolchain-xtensa-esp32@8.4.0+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: .pio/build/roobuck/src/networking/lte_pppos.cpp.o:(.literal._Z13CreateLteInitv+0x20): undefined reference to `NETIF_PPP_STATUS'
/home/chegewara/.platformio/packages/toolchain-xtensa-esp32@8.4.0+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: /home/chegewara/.platformio/packages/framework-arduinoespressif32/tools/sdk/esp32/lib/libesp_netif.a(esp_netif_lwip_defaults.c.obj):/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_netif/lwip/esp_netif_lwip_defaults.c:52: undefined reference to `esp_netif_lwip_ppp_input'
/home/chegewara/.platformio/packages/toolchain-xtensa-esp32@8.4.0+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: .pio/build/roobuck/lib015/libmodem.a(esp_modem_netif.c.o):(.literal.esp_modem_post_attach_start+0x1c): undefined reference to `esp_netif_ppp_set_params'
/home/chegewara/.platformio/packages/toolchain-xtensa-esp32@8.4.0+2021r2-patch3/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: .pio/build/roobuck/lib015/libmodem.a(esp_modem_netif.c.o): in function `esp_modem_post_attach_start':
../lib/modem/src/esp_modem_netif.c:82: undefined reference to `esp_netif_ppp_set_params'

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.

[me-no-dev]

neither bug or on purpose. consequence of changing the build system in the lib-builder or change of defaults in ESP-IDF. Feel free to submit a PR in the lib-builder to enable that :)

[SuGlider]

It was done on purpose because the final WiFi binary grows about 60KB with PPP enabled.
@me-no-dev, we removed it from sdkconfig file when users were complaining about the binary size in version 2. 0.0+.

It was included in the set of PRs regarding Heap and Binary size review when comparing Core 1,0.6 to 2.0.0+ (with IDF).

[SuGlider]

If the application needs LWIP PPP, I'd suggest using Arduino as Component + enabling it in the sdkconfig.
I think that the users that need PPP may be in the more expert side of the spectrum, thus, it won't be a problem going with Arduino as IDF Component project.

[chegewara]

Dont take me wrong, i am not complaining, just i was surprised by the fact its working in 2.00 and not working in 2.0.3+ (maybe earlier).
Like you said, "more advanced" users can enable it, and voila, its enabled already:
https://github.com/chegewara/arduino-esp32-custom/tree/lwip_ppp_enabled

I can accept any option, suggested by @me-no-dev or by @SuGlider , so feel free to close topic.

Thanks

[chegewara]

I also did quick comparison. v2.0.0 vs my custom build with PP enabled, and its not that bad like you said, its not 60kB:

esp-idf v4.4.3 with most recent arduino-builder and PPP enabled
RAM:   [==        ]  17.9% (used 58504 bytes from 327680 bytes)
Flash: [========  ]  77.3% (used 1570701 bytes from 2031616 bytes)

arduino-esp32 v2.0.0
RAM:   [==        ]  16.5% (used 53980 bytes from 327680 bytes)
Flash: [========  ]  76.8% (used 1560077 bytes from 2031616 bytes)

Its about 10kB and it may be anything, not just a PPP, because between v2.0.0 and 2.0.5 there is a lot changes, which could cause this. Also there may be a lot changes, which could cause shrinking code size and enabling PPP actually caused 60kB grow in size.

BTW this is huge project, with wifi, mqtt, lte, ble, dozen tasks and more, and with all enabled still leaves about 50kB free heap on esp32 without psram

[SuGlider]

Ok, let's consider your analysis for the next release.

[Elekronixx]

(maybe earlier). Like you said, "more advanced" users can enable it, and voila, its enabled already: https://github.com/chegewara/arduino-esp32-custom/tree/lwip_ppp_enabled

@chegewara How can I use it in the IDE ? I tied : Update the 2.0.0 to 2.0.5 by boardmanager (working) and then copy your github files into the /arduino_ESP32_IDF2.0.5/portable/packages/esp32/hardware/esp32/2.0.5 directory. But I get

Board esp32 (Plattform esp32, Paket esp32) is unknown

Error compiling for Board ESP32 Dev Module.

BR 'less advanced user' :-)