PPP 拨号

前面的文章已经看到了ttyUSB ,到了这一步 通过AT 我们就其实可以控制3G网卡发送短信,拨打电话了.

要连接网络还需要PPP

1. 下载  https://download.samba.org/pub/ppp/

2.交叉编译 make CC=arm-none-linux-gnueabi-gcc   

3.将生成的 char pppd pppdump pppstats 复制到  /usr/bin 目录下

4.编辑拨号脚本文件

4.1 wcdma-chat-disconnect

ABORT"ERROR"

ABORT "NODIALTONE"

SAY"\nSending break to the modem\n"

'' "\K"

''"+++ATH"

SAY"\nGoodbay\n"

4.2chat-wcdma-connect

TIMEOUT 5

ABORT 'NO CARRIER'

ABORT 'ERROR'

ABORT 'NODIALTONE'

ABORT 'BUSY'

ABORT 'NO ANSWER'

''  \rAT

OK  \rATZ

OK \rAT+CGDCONT=1,"IP","3GNET",,0,0

OK-AT-OK ATDT*99#

CONNECT \d\c

4.3 wcdma

nodetach

lock

/dev/ttyUSB0

115200

user "card"

password "card"

crtscts

show-password

usepeerdns

noauth

noipdefault

novj

novjccomp

noccp 

defaultroute 

ipcp-accept-local

ipcp-accept-remote

connect '/usr/sbin/chat -s -v -f chat-wcdma-connect'

disconnect '/usr/sbin/chat -s -v -f chat-wcdma-disconnect' 

copy以上三个 文件到/etc/ppp/peers

注意标点符号!

5. 开始拨号了  

终端输入命令   pppd call wcdma

终端开始打印

timeout set to 5 seconds

abort on (NO CARRIER)

abort on (ERROR)

abort on (NODIALTONE)

abort on (BUSY)

abort on (NO ANSWER)

send (^MAT^M)

expect (OK)

AT^M^M

OK

 -- got it

send (^MATZ^M)

expect (OK)

^M

ATZ^M^M

OK

 -- got it

send (^MAT+CGDCONT=1,"IP","3GNET",,0,0^M)

expect (OK)

^M

AT+CGDCONT=1,"IP","3GNET",,0,0^M^M

OK

 -- got it

send (ATDT*99#^M)

expect (CONNECT)

^M

ATDT*99#^M^M

CONNECT

 -- got it

send (\d)

Serial connection established.

Using interface ppp0

Connect: ppp0 <--> /dev/ttyUSB0

CHAP authentication succeeded

CHAP authentication succeeded

Could not determine remote IP address: defaulting to 10.64.64.64

local  IP address 10.188.107.188

至此,网卡已连接上网络.

再将ppp0设置为默认路由，route
add default dev ppp0 即可通过ppp0 通道连接网络.