code: def write(self, data):
          
          data_sent = None
  
          try:
              if isinstance(data, str):
                  data = data.encode('utf-8')
  
              data_sent = self._device.send(data)
  
              if data_sent == 0:
                  raise CommError('Error writing to device.')
  
              self.on_write(data=data)
  
          except (SSL.Error, socket.error) as err:
              raise CommError('Error writing to device.', err)
  
          return data_sent
docs: Writes data to the device.
  
          :param data: data to write
          :type data: string
  
          :returns: number of bytes sent
          :raises: :py:class:`~alarmdecoder.util.CommError`