SOLID design pattern are adopted

[ygini]

The SOLID design pattern is requested for the MDM protocol:
S - Single-responsibility Principle
O - Open-closed Principle
L - Liskov Substitution Principle
I - Interface Segregation Principle
D - Dependency Inversion Principle

This should allow the MDM protocol to be easily extendable in the future to support more needs without any impact on previous feature, at least if we do it well…