%device_info = (
  device1 => { version => '1.4', module => [1, 2, 3], memory => '18k' },
  device2 => { version => '1.4', module => [4,5,6], memory => '25k' },
  device3 => { version => '1.2', module => [7,8,9], memory => '18k' },
);