Huawei 3G Module Dial-up Internet

Introduction to a development environment

Kernel version 3.19.5, 3.15 (all 2 of which I have tried)

Compilation Environment Ubuntu 12.04

SIM card Unicom

Two main steps

Support for adding 3G module drivers (option drivers for USB to serial ports) and PPP network protocols to the Linux kernel

Cross-compiling ppp-2.4.2 source code

Copy the two applications PPPD and chats required for dial-up Internet to the Development Board/usr/sbin folder.

Write PPP dial scripts WCDMA, Wcdma-chat-connect, wcdma-chat-disconnect and stored in the/etc/ppp/peers directory. Write DNS to the/etc/resolv.conf file

perform the "PPPD call WCDMA" command to dial

You can also follow these steps:

First go to make Menuconfig interface

1 Configuring 3G module Drivers

Figure 1

1 First select Device Drivers

Figure 2

2 Entering USB support

Figure 3

Go down to USB support until you find Figure 3 and select USB to serial port

Figure 4

Finally select USB driver for GSM and CDMA modems to this 3G card driver has been added complete

The main additions are driver/usb/serial/option.c and driver/usb/serial/usb_wwan.c.

Two files, although the driver has been added, but this is only a USB-to-serial driver, and can not be used as a network device directly, at this time need to support the PPP network protocol, he will ttyusb* and other devices to simulate the use of network equipment (/dev/ttyusb0<----> PPP0)

2 Adding PPP protocols

Also enter make Menuconfig interface

Figure 5

The first is also to enter the driver configuration Interface Device Drivers

Figure 6

6 Select Network Device Support

7 Choosing PPP

Both drivers and protocols have been configured successfully. The next step is to compile and download to the board.

View Development Board Dev Directory

[Email protected] ~]# LS/DEV/TTYUSB
TtyUSB0 ttyUSB1 ttyUSB2 ttyUSB3

Four writing PPP dialing scripts

Because the dial-up script needs to use CHAT,PPPD, such as commands, you need to download ppp-2.4.4

After the download is successful, the first is compile

1 Compiling ppp-2.4.4

Generally very good, but may rely on libpcap-1.6.2.tar.gz this library, zlib library. If there is an error about libcrypt.so during compilation, put the/usr/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib/libcrypt.so in your compilation tool directory This library can be copied to/usr/local/lib/.

Compile the generated CHAT,PPPD, and then copy the command to the/usr/sbin directory of the board file system.

2 Writing a dial-up script

Create three files below the/etc/ppp/peers directory of the board file system below

Wcdma,chat-wcdma-connect,chat-wcdma-disconnect

WCDMA Configuration file Contents

Debug

Nodetach

/dev/ttyusb0

115200

Usepeerdns

Noauth

Noipdefault

Novj

Novjccomp

Noccp

Defaultroute

Ipcp-accept-local

Ipcp-accept-remote

Connect '/usr/sbin/chat-s-v-f/etc/ppp/peers/chat-wcdma-connect '

Disconnect '/usr/sbin/chat-s-v-f/etc/ppp/peers/chat-wcdma-disconnect '

Wcdma-chat-connect Configuration file Contents

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

Wcdma-chat-disconnect Configuration file Contents

ABORT "ERROR"

ABORT "Nodialtone"

SAY "\nsending break to the modem\n"

"\k"

"+++ath"

SAY "\ngoodbay\n"

After the dial script is created, it's officially dialed.

PPPD Call wcdma&

The & symbol is mainly because after the successful dialing, the program will always execute without exiting, so thepppd call WCDMA is the function of establishing the protocol and generating the network interface ppp0. You can also modifyWCDMAScript#Nodetach, and then execute the commandPPPD call WCDMA can be run in the background.

If the following behavior occurs:

Indicates a successful dial-up.

3. Test network connectivity

Ping-i ppp0 www.baidu.com -C 5-i 1 timeout occurs

Route View routing Table

The default gateway is eth0, which removes the default gateway route del Deflaut. Add Ppp0 as default gateway route add default Dev ppp0. manually add DNS echo "nameserver 123.123.123.124" > /etc/ resolv.conf

Ping-i ppp0 www.baidu.com -C 5-s 1

Network communication is normal

Five, realize automatic dialing

Mainly wrote 2 script files, one is the configuration script init.sh, the content is as follows:

echo "NameServer 123.123.123.124" >/etc/resolv.conf
Route del Default
Route add default Dev ppp0
Ifconfig eth0 Down
ifconfig eth0 hw ether 00:12:34:56:78:90
Ifconfig eth0 up

The other is the automatic dialing script pp.sh. The contents are as follows:

dns1= "61.135.169.121" #baidu
Dns2= "61.135.157.156" #qq
PPPD Call WCDMA &
Sleep 12
/root/init.sh
While True
Do
Ping-s 1-c 5 $dns 1 #| ... To ping the first DNS
If ["$?"! = "0"] #€| ... If the ping does not pass
Then
Ping-s 1-c 2 $dns 2 # ... To ping a second DNS
If ["$?"! = "0"] #| ... If the ping does not pass
Then
Killall pppd #| ... End PPPD Process
PPPD call WCDMA & # ... Dial again.
Sleep 12 #€| ... ET 2s
Else
Sleep 5 '
Fi
Else
Sleep 120 #)

Fi
Done

With this script, you can rest assured that the Internet.

Some people also want to get the signal strength of dial-up internet in real time. There are 2 ways to do this.

1, through Microcom-s 115200/dev/ttyusb0 this way to use Ctrl+x to quit!

Input AT+CSQ

At+csq
+csq:11,99


Ok

You can see that the signal strength is 11.

2, can also write a program, through the ttyUSB2 to send the AT+CSQ command, note that this command to the end of \ R, as follows:

Six notes

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.