lwip upgradation

[giksonca]

We want to upgrade ESP32 lwip version to 2.1.2 from 2.0.3. Is there any impact if we upgrade ?

[ESP_Angus]

Yes, this is a substantial undertaking. ESP-LWIP project has a number of patches which are not in the upstream LWIP. You can diff the upstream 2.0.3 release with the current ESP-LWIP HEAD commit to see the differences.

Updating to 100% upstream LWIP without these patches will probably result in some crashes and incorrect TCP/IP functionality. At least some patches would need to be applied to the upstream release.

I'm not sure what the current timetable for the next official ESP-LWIP update is.