Automatically rebooting piaware and prevent outage (avoid "not feeding ADS-B to FlightAware" emails)

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# Send two Ping request packets and 4 seconds timeout
Logfile=/home/pi/pingtest.log

return_value=$(ping -c 2 -W 4 8.8.8.8)
return_value=$?
# Return code for ping are taken from
# ./OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/include/sysexits.h

case$return_value in
	0)  #Ping reply received
		logger "Ping result: ONLINE"
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: ONLINE">> $Logfile
		;;
	1)  #Ping sent but reply was not received
		logger "Ping result: OFFLINE (Ping reply not received), Retrying after 10 seconds"
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (Ping reply not received), Retrying after 10 seconds">> $Logfile
		sleep 10
return_value2=$(ping -c 2 -W 4 8.8.8.8)
return_value2=$?
case$return_value2 in
			0)  #Ping reply received
				logger "Ping result: ONLINE"
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: ONLINE">> $Logfile
				;;
			1)  #Ping sent but reply was not received
				logger "Ping result: OFFLINE (Ping reply not received), Rebooting..."
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (Ping reply not received), Rebooting...">> $Logfile
				reboot
				;;
			*)  #Error
				logger "Ping result: OFFLINE (ping return code: $return_value2), Rebooting..."
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (ping return code: $return_value2), Rebooting...">> $Logfile
				reboot
				;;
esac
		;;
	*)  #Error
		logger "Ping result: OFFLINE (Ping reply not received), Retrying after 10 seconds"
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (Ping reply not received), Retrying after 10 seconds">> $Logfile
		sleep 10
return_value2=$(ping -c 2 -W 4 8.8.8.8)
return_value2=$?
case$return_value2 in
			0)  #Ping reply received
				logger "Ping result: ONLINE"
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: ONLINE">> $Logfile
				;;
			1)  #Ping sent but reply was not received
				logger "Ping result: OFFLINE (Ping reply not received), Rebooting..."
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (Ping reply not received), Rebooting...">> $Logfile
				reboot
				;;
			*)  #Error
				logger "Ping result: OFFLINE (ping return code: $return_value2), Rebooting..."
TZ="Asia/Kolkata" date | xargs echo -n >> $Logfile
echo" Ping result: OFFLINE (ping return code: $return_value2), Rebooting...">> $Logfile
				reboot
				;;
esac
		;;
esac