Module phases

Main loop phase implementations.

5-Phase Structure

1. RX Refill (~20µs)
2. smoltcp Poll - EXACTLY ONCE (~200µs)
3. TX Drain (~40µs)
4. App State Step (~400µs)
5. TX Completions (~20µs)

Target: <1ms per iteration Maximum: 5ms per iteration

Reference

NETWORK_IMPL_GUIDE.md §6.2, §6.3

Constants

• TX_BUDGET
  TX budget per iteration (max packets to send in Phase 3).

Functions

• check_timing_warning
  Check if timing warning should be emitted.
• phase1_rx_refill
  Phase 1: Refill RX queue.
• phase5_tx_completions
  Phase 5: Collect TX completions.