Multi-Tech Systems MTD-EVe manual Using Linux, Shell Commands, Create a PPP Connection, Example

USING LINUX

Using Linux

Shell Commands

Testing Serial Ports

To test the serial ports created by the driver, type in a shell:

cat /dev/ttyUSBx &

#echo –en "ATE0\r" > /dev/ttyUSBx

#echo –en "AT\r" > /dev/ttyUSBx

Note: Sending ATE0 is required, to avoid issues in the terminal output. It prevents the sending/receiving spurious characters to/from the modem when used with the Linux commands “echo” and “cat”

Create a PPP Connection

Most recent Linux distributions have GUI tools for creating PPP connections; the following instructions are for creating a PPP connection through command line interface.

PPP support must be compiled into the kernel; pppd and chat programs are also required.

pppd needs two scripts: the first script performs the environment setting and calls the second script, which is used by the chat program. For creating a PPP connection type:

# pppd file /etc/pppd_script &

Example

#Debug info from pppd debug

#kdebug 4

#Most phones don't reply to LCP echos lcp-echo-failure 3

lcp-echo-interval 3

#Keep pppd attached to the terminal

#Comment this to get daemon mode pppd nodetach

#The chat script (be sure to edit that file, too!)

connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs_connect/etc/chatscripts/evdo_connect"

#Serial Device to which the modem is connected /dev/ttyUSBttyACM

#Serial port line speed

115200 dump

#The phone is not required to authenticate #noauth

user <insert here the correct username for authentication> name <insert here the name of the connection>

password <insert here the correct password for authentication>

#If you want to use the GPRSEV-DO link as your gateway defaultroute

12 QuickCarrierTM USB-D EV-DO MTD-EV3 User Guide