Thanks for the tip. This is what is working for me now: 
my $ssh = Net::OpenSSH->new(
    $host,
    user                => "user",
    password            => "password",
    timeout             => 30,
);

my $motd = $ssh->capture( {
        stderr_to_stdout    => 1, 
    }
);
 
print $motd;

[download]
The devices are indeed crippled, and unfortunately we need to resort to this kind of stuff to know when they break.

In reply to Re^2: Net::OpenSSH to ups appliance by natxo
in thread Net::OpenSSH to ups appliance by natxo

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