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J. Nick Koston
49ba08cec9
Add native UDP support to the lwip raw TCP socket layer used by ESP8266 and RP2040, eliminating the need for Arduino WiFiUDP fallback. Two new classes: - LWIPRawUDPImpl: send-only UDP (8 bytes overhead) - LWIPRawUDPRecvImpl: send+recv with fixed-size ring buffer (no heap allocation in recv callback) Factory functions: socket_udp(), socket_udp_recv(), socket_ip_udp(), socket_ip_udp_recv() with UDPSocket/UDPRecvSocket type aliases. Additive only — no consumer migration in this PR.
