code: def subscribe(self, event):
          
          uuids = event.data
  
          if not isinstance(uuids, list):
              uuids = [uuids]
  
          subscribed = []
          for uuid in uuids:
              try:
                  self._add_subscription(uuid, event)
                  subscribed.append(uuid)
              except KeyError:
                  continue
  
          result = {
              'component': 'hfos.events.objectmanager',
              'action': 'subscribe',
              'data': {
                  'uuid': subscribed, 'success': True
              }
          }
          self._respond(None, result, event)
docs: Subscribe to an object's future changes