code: def get_config_var_data(self, index, offset):
          
  
          if index == 0 or index > len(self.config_database.entries):
              return [Error.INVALID_ARRAY_KEY, b'']
  
          entry = self.config_database.entries[index - 1]
          if not entry.valid:
              return [ConfigDatabaseError.OBSOLETE_ENTRY, b'']
  
          if offset >= len(entry.data):
              return [Error.INVALID_ARRAY_KEY, b'']
  
          data_chunk = entry.data[offset:offset + 16]
          return [Error.NO_ERROR, data_chunk]
docs: Get a chunk of data for a config variable.