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J. Nick Koston
519be06e73
On RP2040, lwip callbacks run from a low-priority IRQ context and can preempt main-loop code. All lwip API calls from the main loop must hold the async_context lock (LWIP_LOCK) to prevent races on shared lwip state (PCB lists, pbuf pools, IGMP groups). The TCP implementation was already correct; the UDP methods were missing the lock. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
