#!/bin/bash
# openAircard320U.sh
# written by bob fulton BRAEWORKS Nov 2012
# script to connect a Telstra Bigpond Sierra Wireless Aircard 320U 4G USB dongle
# BTW the host OS is CentOS 6.4 server and provides internet access (see firewall note)
# to local machines on the LAN and WLAN including iPads and iPods. No desktop nor NetworkManager is required.
# after a few requests added the read back from the modem

# provided AS IS, no warranties, etc. are provided

VERSION=V1.11
PROG="$(basename $0)"
BASEDIR="/custom/broadband"

. ${BASEDIR}/commonAircard320U.inc

echo "Start $PROG $VERSION on $(date '+%Y/%m/%d %H:%M:%S')"

if [ ! -z "$USER" -a "$USER" != "root" ]; then
        echo "Must be root (not $USER) user to execute $PROG."
        exit 1
fi

# wait for dongle to find the signal at power on (optional)
sleep 5

# echo "check its there"
TST=$(usb-devices 2> /dev/null | grep "Product=AirCard 320U")
# echo $TST # test
if [ -z "$TST" ]; then
	echo "Sierra Wireless AirCard 320U not found"
	exit 1
fi

# TTY_USBS=$(ls /dev/ttyUSB*)
# echo $TTY_USBS

# echo "check $NET_ETH is up"
TST=$(ifconfig | awk ' { print $1 } ' | grep $NET_ETH)
if [ -z "$TST" ]; then
    # echo "Bring up $NET_ETH"	# test
    ifconfig $NET_ETH up
    TST=$(ifconfig | awk ' { print $1 } ' | grep $NET_ETH)
    if [ -z "$TST" ]; then
		echo "Failed to bring up $NET_ETH"
		exit 1
    fi
fi

USBTERM_RESPONSE=""	# sometimes the doggle provides erronenous responses (typically trying to use part of a previous command)
function usbTermCmd() {	# $1=outCmd, [$2=-v (verbose)]
	USBTERM_RESPONSE=""
	echo -e "${1}\r" > "$MODEM_PORT"
	while read -t $READ_TOUT R
	do
		if [ "${#R}" -lt 1 ]; then continue; fi	# forget blank lines
		USBTERM_RESPONSE="$R"	# save the last line (usually OK or ERROR)
		if [ ! -z "$2" -a "$2" == "-v" ]; then echo "$R"; fi
	done < "$MODEM_PORT"
	return 0
} # usbTermCmd()

# NOTE: the following lines are stored in the Aircard 320U after the device has been initialized
# and are not needed here
# # usbTermCmd "ATZ"	# ???
# # usbTermCmd "ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0"	# ???
# usbTermCmd "ATD*99**#"
# usbTermCmd "AT+CGDCONT=1,\"IP\",\"telstra.bigpond\""
# usbTermCmd "AT\$QCPDPP=1,1,\"bigpond.password\",\"username@bigpond.com\""

# # disconnect first
# usbTermCmd "AT!SCACT=0,$MPPID"
# sleep 5

# connect
usbTermCmd "AT!SCACT=1,$MPPID" > /dev/null
if [ "$USBTERM_RESPONSE" != "OK" ]; then
	echo "Failed to connect"
else
	echo "Connected"
	# echo "get IP address, etc."
	# NOTE: that the dhclient.conf file will need to setup on a server type machine,
	# otherwise the dhcp will rewrite many settings for DNS etc.
	TST=$(ps ax | grep 'dhclient' | grep $NET_ETH | grep -v 'grep')
	if [ -z "$TST" ]; then
		# echo "Start dhclient on $NET_ETH"	# test
		# should only need to start once
		dhclient -cf ${BASEDIR}/dhclient-Aircard320U.conf -nw -nc -v $NET_ETH	#
	fi

	# not needed as dhclient should do this
	# # check default route is set up
	# USB0_IP=$(ip addr show dev $NET_ETH | grep inet | grep -v inet6 | awk '{ print $2 }')
	# if [ ! -z "$USB0_IP" ]; then
	#   TST=$(route -n | grep $USB0_IP | awk '{ print $1 }')
	#   if [ "$TST" != "default" ]; then
	#     echo "Adding default gateway $USB0_IP"
	#     route del default	# delete other defaults
	#     route add default gw $USB0_IP
	#   fi
	# fi
fi

echo "Finish $PROG $VERSION on $(date '+%Y/%m/%d %H:%M:%S')"
echo ""
exit 0	# done

# EOF