i'm a bit confused by the lines commented out. btw on the documentation on cpan about XML::Simple at the very beginning (QUICK START) it's explained how to get to the second level and further: 
print $config->{server}->{kalahari}->{address}->[1];

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so in your case, you can do something like 
$data->{PairedDevices}->{DeciveA}->{DeviceNickName}

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will return 'SD130' i have no knowledge about snmp so for that i must pass Oha

In reply to Re: Accessing 2nd level elements in XML::Simple and using the data in an SNMP call by oha
in thread Accessing 2nd level elements in XML::Simple and using the data in an SNMP call by wruehl

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