#!/bin/bash

s=${1:-0.005}
t=${2:-0.010}

while :; do
	a=; (( n++ ))

	while { IFS= read -r -d '' -t $t x; r=$?; (( r == 0 || r > 128 )); }; do
		a+=$x
		echo "x: $x (${#x})"
	done < <(for i in {a..z}; do echo -n $i; sleep $s; done; echo -ne '\0')

	echo -e "a: $a (${#a})\n"

	[[ ${#a} < 26 ]] && break
done

for i in {a..z}; do
	[[ $a == *$i* ]] || m+=$i
done

echo "missed $m (${#m}); failed after $n iterations"