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J. Nick Koston
c7560f6878
The RP2040's LEAmDNS library relies on LwipIntf::stateUpCB() to restart mDNS when the network interface reconnects. However, this callback is stubbed out in arduino-pico because the original ESP8266 implementation used schedule_function() which doesn't exist in arduino-pico, and the callback can't safely run directly since netif status callbacks fire from IRQ context while _restart() allocates UDP sockets. The previous workaround blocked all component setup via can_proceed() until WiFi connected, which only helped on initial boot but did not handle reconnects. Replace with a proper fix: detect WiFi reconnection from the existing 50ms mDNS update interval (main loop context) and call MDNS.notifyAPChange() to restart mDNS probing and announcing.
