#!/bin/bash

sleep 1
echo "sync_barrier_start"
nc -v --udp 127.13.3.7 $2 --sh-exec 'while true; do sleep 1; echo a; done' &
nc -v --udp --listen 127.0.0.1 $1 --sh-exec 'killall -9 nc'
echo "sync_barrier_release"
sleep 10
echo "sync_barrier_done"