Examples: replaced hardcoded value

[Chornomorets]

• replaced hardcoded value with existed variable that contains same value;

[dhorner]

The reason why it was Hardcoded is that it is a check to see if it was a Broadcast message (0xFF). If you changed the destination to another address (other than broadcast) then the change breaks it the code.

It would be better to add:

#define BROADCAST_ADDRESS 0xFF
and use that in the code instead of destination.