4G Dial 脚本（N720 Neoway）

#!/bin/bash

string='Gobi'
info_eth1=$(ethtool -i eth1 | grep 'driver')

if  [[ $info_eth1 == *$string* ]]
then
    echo 'eth1 as 4g eth node'
    eth_no='eth1'
else
    echo 'eth0 as 4g eth node'
    eth_no='eth0'
fi

#echo -e "AT+CGATT?\r\n" > /dev/ttyUSB2;
#res1=$(head -n3 /dev/ttyUSB2 | grep "CGATT: 1")
#echo $res1

echo 'Power up 4G module and dial, please wait'

#--- turn off radio and SIM power
echo -e "AT+CFUN=0,1\r\n" > /dev/ttyUSB2
sleep 5

for i in {1..20}
do
    if [ -c /dev/ttyUSB2 ];then
        #AT 指令参考 Neoway_N720_AT命令手册
        cat /dev/ttyUSB2 &
        echo -e "ATI\r\n" > /dev/ttyUSB2
        sleep 1
        echo -e "ATI+CCID\r\n" > /dev/ttyUSB2
        sleep 1
        echo -e "ATI+CREG?\r\n" > /dev/ttyUSB2
        sleep 1
        echo -e "ATI+CSQ\r\n" > /dev/ttyUSB2
        sleep 5

        #运行拨号，如返回$QCRMCALL: 1 V4则正常
        echo -e "AT\$QCRMCALL=1,1\r\n" > /dev/ttyUSB2
        sleep 1
                echo -e "AT\$QCRMCALL=1,1\r\n" > /dev/ttyUSB2
        sleep 5

        udhcpc -i $eth_no
        sleep 1
        ipaddr=$(/sbin/ifconfig $eth_no|grep inet|grep -v 127.0.0.1|grep -v inet6 | awk '{print $2}' | tr -d "addr:")
        for j in {1..5}  #check ip get or not
        do 
            if [ -z "$ipaddr" ]; then
                    echo 'can not get ip re-dhcp'
                udhcpc -i $eth_no
                sleep 1
            else
                    echo $ipaddr
                exit 
            fi
        done

            exit    

    else 
        echo '4G Module reset, just waiting '
        sleep 1
    fi
done 


#PS: 其他AT 指令参考
#断开拨号
#echo -e "AT\$QCRMCALL=0,1\r\n" > /dev/ttyUSB2
#sleep 3

#如下为关闭模块和飞行模式操作方法，供参考
#--- turn off radio and fly mode
#echo -e "AT+CFUN=4,0\r\n" > /dev/ttyUSB2
#sleep 1
#--- turn off radio and SIM power
#echo -e "AT+CFUN=0,0\r\n" > /dev/ttyUSB2
#sleep 1
#--- turn on radio and full function (default)
#echo -e "AT+CFUN=1\r\n" > /dev/ttyUSB2
#sleep 10
#--- Check CFUN state
#echo -e "AT+CFUN?\r\n" > /dev/ttyUSB2

以上脚本适用于T600/T100/T101/T200等型号，但需root 执行
参考文档：
Neoway_N720_AT命令手册（标准版）
Neoway_N720_Linux集成用户手册