I use ZTE USB Modem on Natty Narwhal. Every thing works fine but sometimes it get disconnected. I want to write Shell script that reconnects mobile broadband if it is disconnected or the received data is less than 20 KB after 5 seconds of connection.
So my question is how to enable/disable mobile broadband? How to check for data received? and how to enable/disable network service ?
note: terminal commands only Or if you can write script, I'll be very thankful.
Open terminal window and type:
sudo gedit /etc/init.d/mobile-broadband-connect
Then copy and paste this (Change for your needs):
Note: Replace the <Your Mobile Broadband Connection Name Here> with the name of your connection.
#!/bin/bash
case "$1" in
start)
echo "Starting Mobile Broadband Connection."
while true; do
# testing...to see if gsm is on the list of active devices
LC_ALL=C nmcli -t -f TYPE,STATE dev | grep -q "^gsm:disconnected$"
if [ $? -eq 0 ]; then
break
else
# not connected, sleeping for a second
sleep 1
fi
done
# now once GSM modem shows up, run these commands
nmcli -t nm wwan on
nmcli -t con up id <Your Mobile Broadband Connection Name Here>
;;
stop)
echo "Stopping Mobile Broadband Connection."
nmcli -t con down id <Your Mobile Broadband Connection Name Here>
nmcli -t nm wwan off
;;
status)
# Check to see if the process is running with Network Manager dev status
nmcli -p dev
;;
*)
echo "Mobile Broadband Startup Service"
echo $"Usage: $0 {start|stop|status}"
exit 1
esac
exit 0
Change the permissions of this file for execution:
sudo chmod +x /etc/init.d/mobile-broadband-connect
To run this script has a service, do:
sudo update-rc.d mobile-broadband-connect defaults
The script is registered as a system startup service so you can start, stop, or check the status of the script with :
sudo service mobile-broadband-connect start
sudo service mobile-broadband-connect stop
sudo service mobile-broadband-connect status
Reboot to complete installation and auto connect.
Done ...
I created a shell script as follows and put that in Startup Applications and it works like a charm ! I am happy with this but if you can make it better I'll be very thankful.
#!/bin/bash
while true; do
LC_ALL=C nmcli -t -f TYPE,STATE dev | grep -q "^gsm:disconnected$"
if [ $? -eq 0 ]; then
#jdownloader is still in the download status so stop it because
#internet is disconnected and jdownloader won't resume download
#when connected again
#jdownloader --stop-download
#sometimes I can not get connected after disconnection when
#I click on <name of the network connection>. I have to disable
#and enable Mobile Broadband
nmcli -t nm wwan off
sleep 1
nmcli -t nm wwan on
sleep 1
nmcli -t con up id "Tata Docomo Internet"
#wait approximately 15 sec to get connected
#if anyone can add better command to check for it just comment it :-p
sleep 15
#now connected to internet so start download
#jdownloader --start-download
fi
#it does not worth keep it checking every millisecond.
#my connection will be reestablished within 5-15 seconds
sleep 2
#if anyone can code it better please feel free to comment
#TO-DO:: check for data received. if data < 15 KB after 20 seconds of connection
#reconnect mobile broadband connection
done
#!/bin/sh
echo "Starting Mobile Broadband Connection. Tej"
while true; do
# testing...to see if gsm is on the list of active devices
LC_ALL=C nmcli -t -f TYPE,STATE dev | grep -q "^gsm:disconnected$"
if [ $? -eq 0 ]; then
break
else
# not connected, sleeping for a second
sleep 1
fi
done
# now once GSM modem shows up, run these commands
while true; do
# Enable Mobile Broadband
nmcli -t nm wwan on
# Connect to network
nmcli -t con up id "BSNL/CellOne New GPRS/3G 1"
# Check status if connected or not
nmcli -f device,state -t dev | grep ttyACM0 | awk -F':' '{print $2}' | { read status; }
echo $status;
if [$status == "connected"]; then
break
else
# not connected, sleeping for a second
nmcli -t nm wwan off
sleep 1
fi
done
