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The worker calls the app's on_flow_control hook before each recv and between buffered frames; when it returns 0 the read is skipped so the lwIP receive window closes and stalls the sender. Buffered frames resume without requiring new network data. Add worker_yield (zero-event tcp_poll) so single-core targets (ESP32-C3) cannot starve the IDLE task and trip the task watchdog under a TTS flood. New knobs: TAI_FLOW_CONTROL_POLL_MS and TAI_WORKER_YIELD_MS. Integration test covers per-packet pause, resume without new bytes, and disconnect while paused.
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The worker calls the app's on_flow_control hook before each recv and between buffered frames; when it returns 0 the read is skipped so the lwIP receive window closes and stalls the sender. Buffered frames resume without requiring new network data. Add worker_yield (zero-event tcp_poll) so single-core targets (ESP32-C3) cannot starve the IDLE task and trip the task watchdog under a TTS flood. New knobs: TAI_FLOW_CONTROL_POLL_MS and TAI_WORKER_YIELD_MS. Integration test covers per-packet pause, resume without new bytes, and disconnect while paused.