【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
文章来自：http://www.cnblogs.com/haochuang/p/6215022.html