AB BLE Gateway Http Post

Thanks I’ve read the user guide but it does not cover this topic very well.
Please could you explain the hex data that I’m getting in the post.
I can see the 0D0A value repeated and that means “End of Frame” but where
is the FE value for “Start of the data frame” ? Mine all look like the start with KD which is
strange since it’s hex, I would expect to see only chars A through F, please advise?.