sub Do {
    my ($self, $cmd, $time_out) = @_;
    my ($TimeOut, @lines, $StopTime);
    my ($prematch, $result, $retVal);
    my ($success, @reply);
    my $nice = 0;
    my $linecount = 0;

    tie $retVal, 'ReturnValue';
    $retVal = PASS;
	
    # Empty the input buffer
    $self->{_tnet}->buffer_empty;

    # Clear the last error message
    $self->{_tnet}->errmsg(@reply);

    #cut newline if there is one
    chomp $cmd;
    print $gLog Text => "$cmd\n", Name => $self->{_name};
    if ($cmd =~ /Wait/) {
        # MDL 'Wait' command can be used in scripts, but is not recognised by MCI...
        # Engine provides a 'Wait' function, but sometimes 'Wait' is in a TM script and does not get
        # sent to the Engine 'Wait' function because it doesn't end in a semicolon.
        $cmd =~ s/^\s+//;
        my $waittime = ${[split /\s+/, $cmd]}[1];
        return $gEngine->Wait($waittime);
    }
    
    #If time out is defined this sets the time out.
    if (defined($time_out)) {
        if ($time_out =~/^[0-9]+$/) {
            $TimeOut = $time_out;
        } else {
            print $gLog Text => "Invalid time out provided using 90secs.\n", Color => "blue", Name => $self->{_name};
            $TimeOut = 90;
        }
    } else {
        $TimeOut = 90;
    }
    $_ = $cmd;
    
    # SCFG timeout is 15 minutes.
    /SCFG/i && do { $TimeOut = 900; $nice = 1; };
    
    # initcellsearch timeout is now 60 seconds.
    /initcellsearch/i && do { $TimeOut = 60; };

    # Send command.
    $self->{_tnet}->timeout(1);
    $success = $self->{_tnet}->print( $cmd );
    if (!$success) {
        print $gLog Text  => "Sending the command $cmd to the mobile failed\n", Color => "red", Name  => $self->{_name};
        return $self->_checkfailures($cmd);
    }
    $StopTime = time + $TimeOut;

    # Wait for reply - matches the presence of a 'C:'
    $result = "";
    WAIT: {
        do {
            undef @lines;
            _sleep_for(0.05) if ($nice);
            @lines = $self->{_tnet}->getlines(TimeOut => 0);
            foreach $prematch (@lines) {
                push @reply, $prematch;
                $result .= $prematch;
            }
            if (time > $StopTime) {
                print $gLog Text  => "Confirmation C: not received from mobile in $TimeOut seconds. Checking for errors.\n", Color => 'red', Name  => $self->{_name};
                $retVal = $self->_checkfailures($cmd);
                last WAIT;
            }
        } until (($result =~ /C:\s*(\w+)\s*0x\d\d/i) || ($result =~ /OK/i));
    }
    
    # Count the number of lines received in the WAIT loop.
    $linecount = @reply;
    if ($linecount > 0) {        
        # Print the line. Scan it for errors and set the state accordingly.
        $retVal = $self->_printReturnedLines($result);
    } else {      
        # Fatal error as no lines were received.
        $retVal = FATAL;
    }
    return $retVal if (($retVal == FATAL) || ($retVal == CRASH));
    
	$retVal = $self->Pass_Conf_Ind(@lines, $cmd);   
	return wantarray ? ($retVal, $result) : $retVal;
}