atcommand

#!/bin/bash
#
# Description: use this script file to get the 3G Modem information
#              or other devices information by AT command.

RESPONSE="/tmp/.atresponse"
DeviceStatus="ready"
DEBUG="N"

DBG_ERR() {
	[ "$DEBUG" == "Y" ] && echo $1 >&2
}

do_atcommand() {
	atcommand=$1

        #cat will read the response, then die on timeout
        cat <&5 >$RESPONSE 2>/dev/null &

	DBG_ERR "CMD:$atcommand"
        echo -ne "$atcommand\r\n" >&5 2>/dev/null || {
		DBG_ERR "Device busying!"
		return 1
	}

        #wait for cat to die
        wait $!

	return 0
}

show_help() {
	echo "Usage: atcommand -h/--help"
	echo "Usage: atcommand [-v] dev default-command or atcommand dev -cmd ATxxxx"
	echo "-v:               output error message to stderr"
	echo "-h, --help:       show this help menu"
	echo "dev:              device like ttyACM0 or /dev/ttyACM0"
	echo "default-command:"
	echo "    manufacturer: return 3G modem manufacturer name by AT+CGMI"
	echo "    product:      return 3G modem product name by AT+CGMM"
	echo "    revision:     return 3G modem software revision by AT+CGMR"
	echo "    sn:           return 3G modem serial number by AT+CGSN"
	echo "    imsi:         return SIM card IMSI by AT+CIMI "
	echo "-cmd command:"
	echo "    -cmd ATxxxx   return the result this AT command"
}

[ "$1" == "-h" -o "$1" == "--help" ] && {
	show_help
	exit 0
}

[ "$1" == "-v" ] && {
	DEBUG="Y"
	shift
}

dev=$1
echo $dev | grep "/dev/" >/dev/null 2>&1 || dev="/dev/$dev"
[ -n "$dev" -a -e "$dev" ] || {
	DBG_ERR "Not exist device: $dev"
	exit 1
}

case "$2" in
manufacturer)
	cmd="AT+CGMI";;
product)
	cmd="AT+CGMM";;
revision)
	cmd="AT+CGMR";;
sn)
	cmd="AT+CGSN";;
imsi)
	cmd="AT+CIMI";;
-cmd)
	[ -n "$3" ] && cmd=$3
	[ -z "$3" ] && show_help && exit 1
	;;
*)
	show_help
	exit 1
	;;
esac

RETRIES=5
while [ $RETRIES -gt 0 ]
do
	# Clear old response result file
	echo > $RESPONSE

	# Set modem with timeout of 5/10 a second
	stty -F $dev 115200 -echo igncr -icanon onlcr ixon min 0 time 5 2>/dev/null

	# Open modem on FD 5
	exec 5<>$dev

	echo "debug:$cmd"
	do_atcommand "$cmd" || RETRIES=1

	result=`cat $RESPONSE | sed '/^$/d' | sed "/$cmd/d" | sed -ne '1p'`
	[ -n "$result" ] && {
		echo "$result" | grep -q "ERROR" || {
			echo $result
			RETRIES=1
		}
	}

	# Close FD5
	exec 5<&-

	let RETRIES=RETRIES-1
done

rm -f $RESPONSE

# End Of File