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#!/bin/sh
 
printf "Start at `date`\n"
 
while true; do
    state=`nmcli -f device,state device | grep ttyUSB2 | awk '{ print $2 }'`
    if [ "$state" = "disconnected" ]; then
        result=`nmcli device connect ttyUSB2 | grep 'Unknown error'`
        if [ "$result" ]; then
            echo "Device connect failed, need reset usb device"
            sleep 1
            /root/bin/reset-ttyUSB2
            count=0
            while [ "$count" -lt 60 ]; do
                printf "[$count]\r"
                state=`nmcli -f device,state device | grep ttyUSB2`
                [ "$state" ] && printf "\nGSM back '$state' at `date`\n" && break
                count=`expr $count + 1`
                sleep 1
            done
            if [ "$count" -eq 60 ]; then
                echo "Hmmm, after waiting for $count secs, GSM device still not back"
                echo "Do we need to reboot the system?"
                exit
            fi
        else
            echo "=== Connect return no error ==="
            nmcli device | grep ttyUSB2
            sleep 1
        fi
    else
        echo -n "."
        sleep 10
    fi
done