Memory leak when connecting / disconnecting to WiFi

[lptr]

Looks like we are loosing a few dozen bytes of RAM every time we do a cycle of connecting and disconnecting to WiFi.

This became a problem since https://github.com/kivancsikert/ugly-duckling/releases/tag/0.31.0 as we are now disconnecting from WiFi when in power-save mode. When in this mode, some devices gradually loose memory:

However, it doesn't always happen. Some MK7 instances (but not all) do not experience this phenomenon somehow.

[lptr]

There also seems to be a variation in the slope, where some devices loose memory at a faster (but similarly steady) rate.

[lptr]

The phenomenon stayed after moving from using ESP-IDF as an Arduino dependency to using Arduino as an ESP-IDF dependency.

[lptr]

Looks like this ESP-IDF issue is causing the problem: espressif/esp-idf#8446

[lptr]

The problem persists after upgrading from ESP-IDF 4.4.8 to 5.1.4 (and Arduino 2 to 3.0.5).

[lptr]

Nope. Unfortunately, the problem persists after upgrading to Arduino 3.1.0-rc-1 / ESP-IDF 5.3.1, too. :/

[lptr]

The issue is actually caused by espressif/arduino-esp32#10664. For us it is now fixed via:

• Use ESP-IDF only for WiFi #253