IPv6 readiness and support "by default"

[nuclearcat]

Related area

tcp/ip stack

Hardware specification

any

Is your feature request related to a problem?

IPv6 support for IoT

Describe the solution you'd like

I want to create issue where i can track esp32 ipv6 readiness, ask questions regarding code and propose patches.
First question i have:
libraries/WiFi/src/WiFiGeneric.cpp
function
esp_err_t WiFiGenericClass::_eventCallback(arduino_event_t *event)
event ARDUINO_EVENT_WIFI_STA_CONNECTED
any particular reason why this line commented?
esp_netif_create_ip6_linklocal(esp_netifs[ESP_IF_WIFI_STA]);
Having it uncommented brings at least local IPv6 support.

I think if it might bring compatibility issues, i can send PR that will add some flag in wifi struct, which user can set to enable ipv6.
For user it will look something like:

  Serial.begin(115200);
+ WiFi.IPV6(true);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

Describe alternatives you've considered

No response

Additional context

No response

I have checked existing list of Feature requests and the Contribution Guide

• I confirm I have checked existing list of Feature requests and Contribution Guide.

[copercini]

It's possible to do it calling WiFi.enableIpV6();

I usually use it in ARDUINO_EVENT_WIFI_STA_CONNECTED event, but it should work from other places

[VojtechBartoska]

@nuclearcat Any updates?

[VojtechBartoska]

is this still valid?

[nuclearcat]

Yes might work on it at free time, probably this week

[VojtechBartoska]

thanks @nuclearcat!

[nuclearcat]

I added series of patches in PR, that provide necessary support for IPv6, but it needs serious testing, especially as i dont have yet devboards on s2, s3 and c3.
Also i will test in more scenarios in upcoming days and probably will provide additional test/demo sketches.