fix(net): Allow to compile without IPv6 enabled

[me-no-dev]

cc: @Jason2866

[github-actions]

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Generated by 🚫 dangerJS against 786d831

[github-actions]

Test Results

 62 files   62 suites   7m 23s ⏱️
 22 tests  21 ✅ 0 💤 1 ❌
144 runs  143 ✅ 0 💤 1 ❌

For more details on these failures, see this check.

Results for commit 786d831.

♻️ This comment has been updated with latest results.

[Jason2866]

@me-no-dev Great! Thx. Will test ASAP

[Jason2866]

Tested and build a framework without IPv6 support which worked to build an Arduino sketch with IPv4 only.

[Jason2866]

When IPv6 is disabled in IDF there is something broken. The example sketch https://github.com/espressif/arduino-esp32/blob/master/libraries/WebServer/examples/HelloServer/HelloServer.ino
does compile connects to the AP but the WebServer is not reachable. Ping gets replys from the esp IP address.

[Jason2866]

@me-no-dev Webserver is now reachable with last commit. Build a small Tasmota Variant without IPv6 support. Looks like it is fully working.

[SuGlider]

All Good. Tested WiFi Server, Client and Scan.
No IPv6 saves about 28KB flash space.

[P-R-O-C-H-Y]

Tested WebServer + Client, both working.