[randersson]

We discussed length preambles vs markers when we designed the FAST protocol 8 years ago. That time we made length preambles optional (there are two "modes"). The nature of the FAST encoding made it impractical to use markers even though it would have been entirely possible. This time around we decided to use length preambles. Blink focuses on encoding short messages, so streaming works well with preamble. We expect bit-level errors, disconnects etc. to be handled by a lower layer. Rolf