maemo.org - Talk - Connect to Internet on demand & disconnect automatically, particularly for GPRS?

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Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Anyway to check if the script is running and working?

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by msnger (Post 521908)

Anyway to check if the script is running and working?

For the merged script? You should see one of the yellow notification popups a few seconds after connecting to gprs or wlan and one when it disconnects.

From the command line
ps | grep auto
will show if any autodisconnect is running.

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by calvin_42 (Post 521622)

Hey mclarson!

Thanks for the merge! The script begins to be pretty clean now. I will use it in the application.

I've got a few questions :

1) Why have you chosen to keep the 2 while instructions ? -> See my script with only 1 while
2) Why have you chosen to read the RX instead of the TX value ?
3) Number of bytes to ignore for each time period : where does it come from in fact ? Broadcast ? I ask because in my tests on my device, neither the 3G nor the WLAN connexion have generated transmitted packets when I was connected with no activity. But in my case I read TX value and not the RX value.

Thanks!

It may be wrong for me to answer but since most of the operational code of mclarson seems to be derivated from mine, I'll answer point 3. Put bluntly, your script doesn't fully work for me. When using my wi-fi at home the n900 receives 1 packet of 42 bytes or so every 20 (aprox) seconds. I've tested other 2 wi-fi spots and got another similar situation and another one where I don't receive any packets (and your script would work). Same configuration in the device. That's why I decided to use a small amount of bytes to asure the connection is idle and those are random packets. I don't use TX due to the low traffic and the possible erroneous disconnections that it may cause.

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by mclarson (Post 521782)

Interesting. I agreed with azstunt's detection method but did not think too hard about it as it felt right. Conversely I find it hard to believe there are no TX packets - what about email checks, weather updates or whatever..

In this case, for me, that's not an idle connexion. I consider an idle connexion as a connexion which is not used by any programs running on the device. If your device checks emails, you do not have to close the connexion.

Maybe in the end we're just using a different definition for the term "idle".

Quote:

Originally Posted by mclarson (Post 521782)

For a bulk download relativey tiny ACKS would be sent, ie tiny sample, but would have lots of rx, ie big sample. My *idle* connection does about 2k per minute - there /must/ be tx in there but I've not checked what that traffic is.

I totally agree with you. Of course there will be a lot more RX than TX packets. But you will have several TX packets and then, enough to detect that the connexion is active and used.

What are your 2k per minute used for ? Emails ? Weather update ? Then again we are not using the different definition of the term 'idle'.

Anyway that's interesting because we have both different needs and it has to be taken in account to make a generic app for that.

Thanks again for your feedback!

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by azstunt (Post 522017)

Hey azstunt!

Thanks for the feedback. I didn't asked to you directly because I knew what your answers would be (I have read all your interesting previous posts).

Do you think you could you try to identificate the origin of the 42 bytes ? I'm curious and it would help me to understand the process. I just ran a few tests with my home wifi connexion but unfortunately I didn't log any received or sent packets on my device. That's why I assumed my script worked.

Quote:

Originally Posted by azstunt (Post 522017)

I don't use TX due to the low traffic and the possible erroneous disconnections that it may cause.

As I said before, even if they are a lot more RX packets than TX, I am pretty sure the proportion is the same (TCP needs feedback from the recipient).

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

@mclarson: I've copied your code but while executing I get the following error: line 60: syntax error: "then" unexpected (expecting "{")

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

I think the script should be given a simple GUI, packaged and then see what feedback it gets. I've been wanting something like this since I got my n900 back in November. For me 3g eats up way too much battery life and if I forget to turn it off I find myself without a phone when I most need it.

Many thanks to azstunt for getting the bulk of the work done and to calvin_42 for the extra touches. So far it works ok for me but I'm still trying to find optimal settings.

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by thofstee (Post 522863)

@mclarson: I've copied your code but while executing I get the following error: line 60: syntax error: "then" unexpected (expecting "{")

The 'if' at the beginning of the line has gone missing. Re-copy and try again.

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by mclarson (Post 521034)

I've merged the scripts from azstunt and calvin_42 since they both have great features - I like the visual notification for starting connection monitoring and ending a connection. if-up was a good choice too.

Seems to work quite well. Instructions for install pretty much as azstunt says. Read the comments...

/usr/local/bin/autodisconnect:

Code:

#!/bin/sh



# ---------------------------------------------------------------------------

# MODIFY THESE PARAMETERS TO SUIT

# ---------------------------------------------------------------------------



# How often to test for inactivity

g_samplerate=90



# If only a few bytes are received you may still want to disconnect.

# Specify the number of bytes per minute here.

g_dontcountbytespermin=5000



# Don't auto disconnect for the listed interfaces in g_disable

# Effectively disables this script:

#g_disable="wlan gprs"

# Disable for gprs:

#g_disable="gprs"

# Disable for wlan:

#g_disable="wlan"

# Disconnect enabled for wlan and gprs:

g_disable=



# Enable logging

#g_logging="true"

g_logging="false"



# Where to store the logfile. This is cleared when it goes over 100k.

logfile=/root/autodisconnect.log



# ---------------------------------------------------------------------------

# DON'T MODIFY ANYTHING BELOW THIS POINT

# ---------------------------------------------------------------------------



# ---------------------------------------------------------------------------

# GLOBALS

# ---------------------------------------------------------------------------



# Never drop openvpn. Iface is just a heading therefore not real.

g_disable="Iface tun "$g_disable



# Number of bytes to ignore for each time period

g_dontcountbytes=$((g_dontcountbytespermin*g_samplerate/60))



# ---------------------------------------------------------------------------

# FUNCTIONS

# ---------------------------------------------------------------------------



# ---------------------------------------------------------------------------

init()

# ---------------------------------------------------------------------------

{

    # Allow dbus to work

    [[ -e /tmp/dbus-info ]] && eval `cat /tmp/dbus-info`



    export DBUS_SESSION_BUS_ADDRESS \

           DBUS_SESSION_BUS_PID \

           DBUS_SESSION_BUS_WINDOWID



    # Don't let log file get too big

    if [[ -w "$logfile" ]]; then

        size=`stat $logfile | grep Size | awk '{ print $2; }'`

        [[ "$size" -gt 100000 ]] && :>$logfile

    fi

}



# ---------------------------------------------------------------------------

logentry()

# ---------------------------------------------------------------------------

# Send a string to this function to append it to the log file

#

# Arg 1 - The text to log

{

    [[ "$g_logging" == "true" ]] && {

        echo -e "`date` $1" >> $logfile

        echo "`date` $1"

    }

}



# ---------------------------------------------------------------------------

osnotify()

# ---------------------------------------------------------------------------

# Send a string to this function to generate a system popup

#

# Arg 1 - The text to display

{

    /usr/bin/dbus-send --type=method_call \

        --dest=org.freedesktop.Notifications \

        /org/freedesktop/Notifications \

        org.freedesktop.Notifications.SystemNoteInfoprint \

        string:"$1"

}



# ---------------------------------------------------------------------------

disconnect()

# ---------------------------------------------------------------------------

# Disconnect current connection

#

# No args

{

    dbus-send --system --dest=com.nokia.icd \

        /com/nokia/icd_ui \

        com.nokia.icd_ui.disconnect \

        boolean:true

}



# ---------------------------------------------------------------------------

disable_quit()

# ---------------------------------------------------------------------------

{

    # Disable for some interfaces

    [[ -n "$g_disable" ]] && {

        if echo "$g_disable" | grep -qs "$interface" 2>/dev/null; then

            #osnotify "Auto-disconnect disabled for $interface"

            logentry "Auto-disconnect disabled for $interface"

            exit 0

        else

            osnotify "Auto-disconnect enabled for $interface"

            logentry "Auto-disconnect enabled for $interface"

        fi

    }

}



# ---------------------------------------------------------------------------

main()

# ---------------------------------------------------------------------------

# Main entry point

{

    init



    # Log monitor startup to file & notify user via popup

    logentry "Auto-disconnect starting"

    interface=`grep -v tun /proc/net/route | tail -1 | cut -f1 | tr -d 0-9`

    logentry "Current connection : $interface"



    # Quit if this interface is in the g_disable list

    disable_quit



    while true; do

        sleep $g_samplerate

        a=`grep -v tun /proc/net/route | tail -1 |cut -f1` 

        while [[ "$a" != "Iface" ]]; do

            b=`ifconfig $a | grep RX.b | cut -d"(" -f1 | cut -d: -f2`

            c=$b

            sleep $g_samplerate

            b=`ifconfig $a | grep RX.b | cut -d"(" -f1 | cut -d: -f2`

            a=`grep -v tun /proc/net/route | tail -1 |cut -f1`

            if [ "$a" == "Iface" ]; then

                osnotify "Auto-disconnect for $interface stopped."

                logentry "$interface lost. Quitting."

                exit 0

            fi

            if [ "$b" -lt "$((c+g_dontcountbytes))" -a "$a" != "Iface" ]; then

                disconnect

                osnotify "Connection $interface closed due to inactivity"

                logentry "$interface closed. Bytes received : $((b-c))"

                exit 0

            else

                logentry "$interface: Bytes received : $((b-c))"

            fi

        done

    done

}



# Start

main



exit 0

/etc/network/if-up.d/99_autodisconnect:

Code:

#!/bin/sh



AUTODISCONNECT=/usr/local/bin/autodisconnect



if [ ! -x $AUTODISCONNECT ]; then

  exit 0

fi



$AUTODISCONNECT

/etc/network/if-down.d/99_autodisconnect:

Code:

#!/bin/sh



AUTODISCONNECT=/usr/local/bin/autodisconnect



if [ ! -x $AUTODISCONNECT ]; then

  exit 0

fi



kill `pidof autodisconnect`

Enjoy!

This is a brilliant idea, could we get this created as an actual Maemo application?

I can see this benefitting alot of people :)

Re: Connect to Internet on demand & disconnect automatically, particularly for GPRS?

Quote:

Originally Posted by sandybeach (Post 522933)

This is a brilliant idea, could we get this created as an actual Maemo application?

I can see this benefitting alot of people :)

Working on it!