Linux uses PPPD and PPP programs for 3G/4G dialing

Test environment: Linux marsboard 3.4.90 #9 SMP PREEMPT Thu Mar 3 18:28:43 CST armv7l armv7l armv7l gnu/linux (note: A20 Core Board)

Communication module, loaded into ttyusb* equipment;

Target: Use the communication module for 3G4G dial-up connection to the Internet

Method: Use PPPD and PPP programs to make dial-up Connections

Prerequisite: PPP, PPPD two programs installed

Summary: The Chat-script dial script for the file PPP involved (the situation needs to be adjusted for non-communication devices, this is not considered here, most of them can be used),

Steps:

1, create the PPP program dial script, the contents are as follows: (There are two, one for mobile, Unicom and telecom 4G, one is only for telecom 3G)

# for Mobile, Unicom and telecom 4G, filename chat-script

#!/bin/sh

EXEC chat-v \
TIMEOUT 5 \
ABORT "BUSY" \
ABORT "ERROR" \
ABORT "NO CARRIER" \
"\rat \"
Ok ' at+cgdcont=1, ' IP ', ' CMNET ' \
OK ' atdt*99# ' \
CONNECT ' \

-----------------different scripts to be split, there are no files in the file-----------------------------------------

#  for telecom 3G, filename chat-script-ct3g

#!/bin/sh
EXEC chat-v \
TIMEOUT 5 \
ABORT "BUSY" \
ABORT "ERROR" \
ABORT "NO CARRIER" \
"\rat \"
Ok ' at+cgdcont=1, ' IP ', ' CMNET ' \
OK ' atdt#777 ' \
CONNECT ' \

2. Create two dial-up scripts, ppp-on for dial-up Connections Ppp-off user disconnects

# file Ppp-on

#! /bin/sh

# string Number $/baud rate $3chat script
PPPD modem-d-detach Lock $ kdebug 4 file/etc/ppp/options crtscts noipdefault netmask 255.255.255.0 defaultroute con Nect

------------------------------------------------------

# file Ppp-off

#!/bin/sh
######################################################################
#
# determine the device to be terminated.
#
if ["$" = ""]; Then
device=ppp0
else
device=$1
fi

######################################################################
#
# If The ppp0 PID file is present and the program is running. Stop it.
if [-r/var/run/$DEVICE. pid]; Then
kill-int ' cat/var/run/$DEVICE. PID '
#
# If The kill did not work then there are no process running for this
# PID. It may also mean, that the lock file would be a left. Wish
# To delete the lock file at the same time.
IF [! "$?" = "0"]; Then
rm-f/var/run/$DEVICE. PID
echo "error:removed stale pid file"
Exit 1
fi
#
# Success. Let PPPD and its own junk.
echo "PPP link to $DEVICE terminated."
Exit 0
fi
#
# The PPP process is not a running for ppp0
echo "ERROR:PPP link isn't active on $DEVICE"
Exit 1

3. How to use

Give execute permission to the four script files above and execute with root permission

./PPP-OF/DEV/TTYUSB1 115200 Chat-script (Specific path)

Use Ifconfig to view the results of dialing

4, attached to the script you wrote, which calls the above dial-up script

#! /bin/sh
Wr= "/home/marsboard/pppd-net"

# string Number $ baud rate $3chat script $4 ppp-on log
${wr}/ppp-on $ ${wr}/$3 > ${wr}/$4 &
Sleep 8

# Get dialing information from the ppp-on log
Interfacename= "Using Interface"
Addressipname= "Local IP address"
Gatewayname= "Remote IP address"

interface= ' grep "$INTERFACENAME" ${wr}/$4|awk ' {print $} '
addressip= ' grep ' $ADDRESSIPNAME ' ${wr}/$4|awk ' {print $4} '
gatewayip= ' grep "$GATEWAYNAME" ${wr}/$4|awk ' {print $4} '

# Determine if dial is successful
For n in ' seq 3 '
Do
Ping-c 1 ${addressip}-I ${interface} >/dev/null 2>&1
If [$?-eq 0]
Then
echo "PPP successed!!"
echo "${interface}, ${addressip}, ${gatewayip}"
Return
Fi
Done
echo "PPP failed!!"

Linux uses PPPD and PPP programs for 3G/4G dialing