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J. Nick Koston
7bb1ae6520
LEAmDNS update() and close() can yield inside UdpContext::sendTimeout() while a send fails; an mDNS packet arriving then re-enters LEAmDNS from lwIP on the same UdpContext and both sides free the same tx pbufs, which corrupts the heap and shows up later as crashes such as the NULL dereference in noise_handshakestate_new during the API handshake. mdns_esp8266.cpp now owns a MDNSResponder subclass (NO_GLOBAL_MDNS) whose receive handler only counts packets while a main loop call is running and drains them from the main loop afterwards. The roaming gate from #18785 and the is_roaming() accessor it needed are no longer required.
