with doing
push @{$slots{$device}}, $rtr_diag;

[download]
you are populating an anonymous array, better try that with the already existant hash 
$slots{$device} = $rtr_diag;

[download]

Have a nice day
All decision is left to your taste

In reply to Re: Nesting/Loop/Print problem by little
in thread Nesting/Loop/Print problem by Limo

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