OpenWRT huawei modem reset/restart or reboot device

#!/bin/sh
MODEMDEV="/dev/ttyUSB1"
HOST_1=8.8.8.8
HOST_2=8.8.4.4
STRING_OK="Connection OK..."
STRING_LOSS="Connection loss... send \"AT^RESET\" to $MODEMDEV"
STRING_NOTFOUND="Device $MODEMDEV not found, device reboot."

ping -c 3 $HOST_1 > /dev/null 2>&1
if [ $? -ne 0 ]; then
    ping -c 3 $HOST_2 > /dev/null 2>&1
    if [ $? -gt 0 ]; then
        if [ -e $MODEMDEV ]; then
            logger $STRING_LOSS
            echo $STRING_LOSS
            echo -ne "AT^RESET\r" > $MODEMDEV
        else
            logger $STRING_NOTFOUND
            echo $STRING_NOTFOUND
            reboot
        fi
        exit 1
    else
        logger $STRING_OK
        echo $STRING_OK
        exit 0
    fi
else
    logger $STRING_OK
    echo $STRING_OK
    exit 0
fi