Simple script to ping and then atftp a firmware image e.g. openwrt or dd-wrt

ping_atftp.sh

#!/bin/bash
# Simple script to ping and then atftp a firmware image
# Works on my machine and an ASUS WL-500g series router
# Usage: ./ping_atftp 192.168.1.1 openwrt-brcm47xx-squashfs.trx

EXPECTED_ARGS=2
if [ $# -ne $EXPECTED_ARGS ]; then
echo "Usage: `basename $0` ip-addr firmware-image"
exit 1;
fi

count=50
while [[ $count -ne 0 ]] ; do
    ping -w 1 -l 3 -i 0.2 -t 0.01 -c 1 $1
    rc=$?
    if [[ $rc -eq 0 ]] ; then
        count=1
    fi
    ((count=count-1))
done

if [[ $rc -eq 0 ]] ; then
    echo "The router is online."
    atftp -p -l $2 --trace --verbose $1
else
    echo "Timeout."
fi