#! bin/sh

modem=/dev/ttyUSB3
file=/home/giuseppe/Desktop/SCRIPTMODEM/imsi.txt
chat_script=/home/giuseppe/Desktop/SCRIPTMODEM/omnitel.chat

exec 3<&1 >"$modem" <"$modem"

stty 115200 clocal
if ! chat -v -s -f "${chat_script}"; then
    echo "error setup modem" >&2
    exit 1
fi

die() {
    echo "$@" >&2
    exit 1
}
send_expect() {
    chat -v -f 'ABORT ERROR' '' "$@" ''
}

if ! [ -e "$modem" ]; then
    die 'Modem not connected'
fi

if ! send_expect 'AT+CREG?' '+CREG: 0,1'; then
    die 'Modem not registered'
fi

if ! send_expect 'AT!PADCONN=1' 'CONNECT'; then
    die 'Unable to open socket'
fi

cat"$file"
echo "done" >&3

#! /bin/bash
exec 2>error

cat /dev/ttyUSB3 /home/giuseppe/Desktop/SCRIPTMODEM/imsi.txt &
sleep 1

# CONTROLLO MODEM CONNESSO
if ! [ -e /dev/ttyUSB3 ]; then
    echo 'Modem non connesso'
    exit 0
fi

if ! chat -V -f 'ABORT ERROR' '' "$@" '' 'AT' 'OK' > /dev/ttyUSB3 < /dev/ttyUSB3; then
    echo "$@" 'ERRORE AT 1'
fi

sleep 2
killall cat
exit 0