Stopping a PPP connexion

hwoarang · 10-01-2009, 05:54 AM

Hi all,

I am currently using a PPP connexion on an embedded ARM board. On this board, there is a RS232 connector where we have Tx, Rx, CTS and RTS. All other signals are not there.

I can establish the PPP connexion but when it is established and I reboot the board, the modem does not detect the end of connexion and when the board boots again, I cannot launch a new PPP connexion. I have to unplug the modem to make it work again.

I believe that the problem comes from the modem not detecting the board's reboot. Since there, the modem does not respond to at commands. Is there some way to handle it, configuring PPP or sending some trame to the modem ?

Thanks

PS : The modem is a Wavecom fastrack supreme.

Anarion · 10-01-2009, 06:37 AM

Hi, I don't know if this is what you need to do, but I use this command for connecting:

Code:

poff dsl-provider

Note: "dsl-provider" is the name of connection, or you can just use "poff" without the name of connection if there's just one active. I also use this one for connecting:

Code:

pon dsl-provider

Hope this helped you.

hwoarang · 10-01-2009, 10:57 AM

Thanks for your answer. pon and poff are used to establish a PPP connexion. That works. But my problem is that when I am connected and I reboot my board, the modems seems to be still connected and I can no longer connect it again.

Any idea on how to force the modem to reset ? Or maybe there is some configuration to make it reset when there is no PPP trafic during some time ?

Anarion · 10-01-2009, 01:50 PM

You could add the poff script a way that it will be run at reboot/shutdown... Which will be like this:
1. First, create a script file. let's call it mypoffcmd

Code:

#!/bin/bash
echo "Disconnecting from internet..."
poff dsl-provider

2. make it executable and then add it for halt and reboot:

Code:

sudo cp mypoffcmd /etc/init.d
sudo ln -s /etc/init.d/mypoffcmd /etc/rc0.d/K10mypoffcmd
sudo ln -s /etc/init.d/mypoffcmd /etc/rc6.d/K10mypoffcmd

I haven't tested it yet, the info on how to add a command for halt/reboot time came from http://ubuntuforums.org/showthread.php?t=185261

Just let me know if it works.

hwoarang · 10-02-2009, 04:47 AM

Yes, that should work in case of software reboot. But the problem is that I want that to work even if the board is unplugged while the modem is still connected. After some search, It seems that the modem can be disconnected and returned to the command mode by sending the command "+++". So I made an executable that sends this command to make sure that the modem is ready when I call pppd, no matter about its previous state. Then I send "at+cfun=1" to reset the modem and it works.

Thanks for the help Anarion.

Anarion · 10-03-2009, 03:11 AM

Welcome! but Would you please write what you did to send that command ? I guess I need that too