Thanks @BulldogLowell, I see you are with me!
I guess that's right, but I am so happy with @Ric's solution that I would prefer to refine that one further with CRC checking rather than to try all over again starting with another library. Let me know if you don't agree and which one gives us a better solution... 
Concerning the extra "filtering" needed:
I remembered another exercise with @Ric, developing a "filtering method": LINK
Probably that's an even better way than my previous idea...
What do you think?
