def properties
      convert_map_to_hash(@device.getProperties) do |hash, key, value|
        hash[key.toString] = value.toString
      end
    end
def properties
      convert_map_to_hash(@device.getProperties) do |hash, key, value|
        hash[key.toString] = value.toString
      end
    end
Returns the device properties. It contains the whole output of 'getprop'
 @return [Hash<String, String>] the device properties