code: def connect(self, server_config):
          
          if 'connection_string' in server_config:
              self.client = pymongo.MongoClient(
                      server_config['connection_string'])
              self.db = self.client[server_config['db']]
          else:
              self.client = pymongo.MongoClient(
                  server_config['host'],
                  server_config['port'],
                  tz_aware=self.get_config_value('tz_aware', True))
  
              self.db = self.client[server_config['db']]
  
          if ('authentication_database' in server_config and
                  server_config['authentication_database']):
              self.db.authenticate(
                      server_config['username'], server_config['password'],
                      source=server_config['authentication_database'])
          else:
              if 'username' in server_config:
                  if 'password' in server_config:
                      self.db.authenticate(server_config['username'],
                                           server_config['password'])
                  else:
                      self.db.authenticate(server_config['username'])
  
          # Mongo Engine connection
          d = dict((k, v) for k, v in server_config.items()
                   if k not in ['modalities', 'summaries'])
          if 'authentication_database' in d:
              d['authentication_source'] = d['authentication_database']
              del d['authentication_database']
  
          self.session = connect(alias="hyperstream", **d)
  
          # TODO: This sets the default connection of mongoengine, but seems to be a bit of a hack
          if "default" not in connection._connections:
              connection._connections["default"] = connection._connections["hyperstream"]
              connection._connection_settings["default"] = connection._connection_settings["hyperstream"]
docs: Connect using the configuration given
  
          :param server_config: The server configuration