class ROTP::TOTP

def get_timecodes(at, drift_behind, drift_ahead)

Get back an array of timecodes for a period 
def get_timecodes(at, drift_behind, drift_ahead)
  now = timeint(at)
  timecode_start = timecode(now - drift_behind)
  timecode_end = timecode(now + drift_ahead)
  (timecode_start..timecode_end).step(1).to_a
end