#!/usr/bin/perl
use strict;
use warnings;
use XML::Twig;
$|++;
open my $fh,'<','xmlstream.xml' or die;

while (<DATA>) {
    chomp;
    if ($_ =~/Content-Length: (\d+)/){
          my $len = $1;
          my $xml;
          my $read = read (DATA,$xml,$len,0);
          print "read: tried $len got $read: [$xml]\n";
          my $t= XML::Twig->new( pretty_print => 'indented',
                    twig_handlers => {
                          'ipAddress'=>sub{print "\t\tIP ADDRESS:\t",$_[1]->text,"\n"; }
                    }
          );
          $t->parse($xml);
    }
}

__DATA__
Content-Type: application/xml; charset="UTF-8"
Content-Length: 478











<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/ver10/XMLSchema">
<ipAddress>10.1.10.23</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>c4:2f:90:00:00:00</macAddress>
<channelID>1</channelID>
<dateTime>2015-06-24T19:37:22--8:00</dateTime>
<activePostCount>0</activePostCount>
<eventType>videoloss</eventType>
<eventState>inactive</eventState>
<eventDescription>videoloss alarm</eventDescription>
</EventNotificationAlert>

Content-Type: application/xml; charset="UTF-8"
Content-Length: 514
<EventNotificationAlert version="1.0" xmlns="http://www.hikvision.com/ver10/XMLSchema">
<ipAddress>10.1.10.23</ipAddress>
<portNo>80</portNo>
<protocol>HTTP</protocol>
<macAddress>c4:2f:90:00:00:00</macAddress>
<channelID>1</channelID>
<dateTime>2015-06-24T19:37:22--8:00</dateTime>
<activePostCount>1</activePostCount>
<eventType>VMD</eventType>
<eventState>active</eventState>
<eventDescription>Motion alarm</eventDescription>
<DetectionRegionList>
</DetectionRegionList>
</EventNotificationAlert>