s60v3-tether

#!/bin/bash

# Bluetooth tethering for s60v3 phones in Debian 12 (bookworm)

rfc_channel=0 # choose rfcomm channel to be used
              # (it must be the same as in /etc/wvdial.conf)
devrfcomm="/dev/rfcomm$rfc_channel"

echo "Using $devrfcomm"

if [ $# -lt 1 ]; then 
    echo "Give as a parameter the bluetooth name of the (paired) phone you wish to tether"; exit 
fi

function deactivate_bt() {
    tmp=$(ls $devrfcomm 2> /dev/null);
    if [ -z "$tmp" ]; then
	echo "Deactivating bluetooth"
	sudo rfkill block bluetooth
    fi
}

function ctrl_c() {
    echo "Releasing $devrfcomm"
    sudo rfcomm release $rfc_channel
    echo "Restarting NetworkManager"
    sudo service NetworkManager start
    deactivate_bt
    exit
}

function ctrl_c0() {
    echo ""
    echo "Restarting NetworkManager"
    sudo service NetworkManager start
    deactivate_bt
    exit
}


echo -n "Getting bluetooth address of $1: "
#tmp=$(bluetoothctl paired-devices|grep $1)
tmp=$(bluetoothctl devices Paired|grep $1)
tmp=${tmp#Device }
if [ "$tmp" == "" ]
then 
    echo "device not paired"
    exit
fi
bt_address=${tmp%" $1"}
echo $bt_address
echo "Stopping NetworkManager"
sudo service NetworkManager stop
trap ctrl_c0 SIGINT
echo "Activating bluetooth"
sudo rfkill unblock bluetooth 
echo -n "Getting dial-up channel: " 
bt_channel=""
while [ "$bt_channel" == "" ]; do
    tmp=$(sdptool search --bdaddr "$bt_address" DUN|grep Channel) 
    bt_channel=${tmp#*: } 
done
echo $bt_channel
echo "Binding rfcomm $rfc_channel to $bt_address/$bt_channel"
sudo rfcomm bind "$rfc_channel" "$bt_address" "$bt_channel"
echo "Tethering $1 (CTRl-C to finish)"
trap ctrl_c SIGINT
sudo wvdial bluetooth