groups similar methods/classes

[erickvermot]

Group similarities as in HWAdress and DPID.
The have very similar pack functions for example.
Maybe should they be derived from a same base class ("colon separated hex
values...")
Same with echo request, echo reply, and hello... and many others..

Maybe implement using Mixin classes, as proposed by Diego. I agree;

[beraldoleal]

I Agree. Definitely this need a refactoring. There is a few duplicated code there.

For instance _fmt is not being used in some cases. But lets discuss this on future refactoring.