Three related issues were causing the simulation to get stuck:
1. Network events (connect, disconnect, send_data) were scheduled with
relative times instead of absolute times, causing events to be
scheduled in the past once simulation time exceeded 10-100ms.
2. When DATA events couldn't be fully consumed (receiver buffer full),
they stayed at their original time, preventing time from advancing.
Now they are rescheduled to current_time + 10ms.
3. When poll_timeout was 0, WAKEUP events were created at current_time,
causing an infinite loop where time never advanced. Now timeout=0
sets timedout immediately without creating an event.
Claude
cozis