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70047d0948
Add WARN-level traces in LWIPRawImpl::recv_fn and LWIPRawListenImpl::s_queued_recv_fn so we can confirm whether lwIP is actually delivering received TCP data up to the application on a failing OTA. The packet capture in #15953 shows the device's TCP layer not ACKing the OTA firmware burst even though the same connection's handshake bytes go through normally and a concurrent API connection keeps working — these traces are intended to bisect 'is the data reaching the application's recv callback at all'. Diagnostic only — not for merge.
