#!/bin/bash

attempt=0
sleep 1
while true; do
    rslt=$(timeout .5 parec --raw 2> /dev/null | od -N2 -td2 | head -n1)
    if [ "$rslt" = "0000000" ]; then
        if [ $attempt -lt 50 ]; then
            pacat /dev/null
            echo "wake attempt $attempt"
            attempt=$((attempt + 1))
        else
            sleep 1
        fi
    else
        attempt=0
        sleep 1
    fi
done