docs: def _ic_decode(self, msg):
          """IC: Send Valid Or Invalid User Code Format."""
          code = msg[4:16]
          if re.match(r'(0\d){6}', code):
              code = re.sub(r'0(\d)', r'\1', code)
          return {'code': code, 'user': int(msg[16:19])-1,
                  'keypad': int(msg[19:21])-1}