start()
{
    socat -d -d pty,raw,echo=0,link=/tmp/ttyV0 pty,raw,echo=0,link=/tmp/ttyV1 < /dev/null > /dev/null &
}

stop()
{
    while [ 1 ]; do
        echo "* Stopping process..."        
        killall socat > /dev/null 2>&1

       
        for r in 0 1 2 3 4 5 6 7 8 9; do
            if [ -n "$(pidof socat)" ]; then
                echo "* Waiting for process to exit ($r)..."
                sleep 1
            else
                echo "* Process not running."
                return 1
            fi
        done

        echo "* Forcing exit..."
        killall -9 socat > /dev/null 2>&1
        sleep 1
    done
}