Remove MAC Address Requirement

[isaac-webb]

Is your feature request related to a problem? Please describe:
The v1.0.0 implementation requires that MAC addresses be input in all caps with no colons, contrary to the way they are normally written.

Describe the solution you'd like:
Allow MAC addresses to be written lowercase and with or without colons.

Describe alternatives you've considered:
Requiring colons may be more consistent with convention.

Additional context:
The API uses all caps, no colons MAC addresses, which is where the restriction comes from.