code: def _convert_to_bytes(type_name, value):
      
  
      int_types = {'uint8_t': 'B', 'int8_t': 'b', 'uint16_t': 'H', 'int16_t': 'h', 'uint32_t': 'L', 'int32_t': 'l'}
  
      type_name = type_name.lower()
  
      if type_name not in int_types and type_name not in ['string', 'binary']:
          raise ArgumentError('Type must be a known integer type, integer type array, string', known_integers=int_types.keys(), actual_type=type_name)
  
      if type_name == 'string':
          #value should be passed as a string
          bytevalue = bytes(value)
      elif type_name == 'binary':
          bytevalue = bytes(value)
      else:
          bytevalue = struct.pack("<%s" % int_types[type_name], value)
  
      return bytevalue
docs: Convert a typed value to a binary array