NitrokeyManager: Also return serial number as u32

This patch adds the get_serial_number_as_u32 method to NitrokeyManager.
It returns the serial number as a 32-bit unsigned integer.  Previously,
we only returned it as a string generated from the integer value,
get_serial_number.

While get_serial_number returns an empty string if no device is
connected and "NA" if an unknown model is connected, the new method
throws a DeviceNotConnected exception in the first case and returns zero
in the second case as we cannot express the three states in one integer
return value.

0 files changed, 0 insertions, 0 deletions