Function decode_log_record 

pub fn decode_log_record(
    data: &[u8],
    offset: usize,
) -> Result<(BACnetLogRecord, usize), Error>

Decode one Trend Log record starting at offset, returning it and the offset just past it.

Records sit back to back in a ReadRange item list, so the optional status flags are read only when the very next tag is the primitive context 2; anything else is left for the caller as the start of what follows.