Checking 4 bytes to mark beginning and end of a data packet on incoming bluetooth data

[ABG]

@Ben_Biles

If I can get rid of those packet header bytes showing up in the file name byte packets it should work ok. just cannot think how they get there right now!

Typical communication stacks follow a design pattern of progressively unwrapping a data sandwich, where each software layer eats only the bread, and passes the contents to the next software layer.