【树莓派】树莓派使用4G模块上网

想了解一下树莓派通过4G网络模块通信如何实现，看到这篇文章（http://www.lxway.com/95811506.htm），准备接下来有机会实践一下，先留存学习；

一、4G Luci配置

1、 新建一个wwan接口；

2、 上网方式为dhcp自动获取；

3、 物理设置选择wwan0；

4、 防火墙选择wan

二、重连脚本redial4g

LogFile=/root/4g_Log.log
mdate=`date +%R-%d-%m-%Y`

if [ -e /var/run/udhcpc-wwan0.pid ]; then
    echo 4G pid is ok!
    #echo $mdate 4G pid is ok! >> $LogFile
    #exit 0
else
    echo 4G pid is failed!
    echo $mdate 4G pid is failed! >> $LogFile
    #/etc/myLte/dial4g
    #reboot
    #exit 0
fi

if ping -c3 www.baidu.com > /dev/null 2>&1
then
    echo ping baidu is ok!
    #echo $mdate  ping baidu is ok! >> $LogFile
    echo 0 > /tmp/4g_tmp.txt
    exit 0
else
    echo ping baidu is failed!
    echo $mdate ping baidu is failed! >> $LogFile
    /etc/myLte/dial4g  #must place here
    #read pvar < /tmp/4g_temp.txt
    #if [ -z "$pvar" ] ; then
    #    pvar=0
    #fi
    if [ ! -f "/tmp/4g_tmp.txt" ] ; then
        pvar=0
        echo file not exist
    else
        read pvar < /tmp/4g_tmp.txt
        echo file exist
    fi
    pvar=`expr $pvar + 1`
    echo $pvar > /tmp/4g_tmp.txt
    if [ $pvar -ge 5 ] ; then
        echo failed 5 times!
        echo $mdate failed 5 times! >> $LogFile
        reboot
    fi

fi
exit 0

三、crontab

*/2 * * * * /etc/myLte/redial4g

重连时间不要设太短，太短可能还没拨号结束就又进行重播，会重复了。

四、拨号脚本dial4g

PORT=/dev/ttyUSB0
MODE="AT+CFUN=1" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
MODE="AT+COPS=0" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
MODE="AT+CEREG=1" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
MODE="AT+CGDCONT=1,‘IP‘" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
MODE="AT+CGACT=1,1" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
MODE="AT+ZGACT=1,1" gcom -d $PORT -s /etc/gcom/setmode.gcom
sleep 3
ifup wwan &
exit 0

五、开机启动

# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.

/etc/myLte/dial4g

exit 0