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J. Nick Koston
9265d9e0f8
When LWIPRawImpl creation was deferred to the main-loop accept(), the queued PCB had no recv callback registered. lwip's default tcp_recv_null handler ACKs incoming data but drops it silently. On ESP8266, lwip processes TCP segments in batches — if the SYN completion and first data packet arrive in the same batch, the API handshake data is lost, causing SocketClosedAPIError (EOF). Fix: register temporary recv/err callbacks on queued PCBs that buffer any data received before accept() creates the LWIPRawImpl. The buffered data is transferred to the new socket via init().
