code: def someoneKnownSeen(self, home=None, camera=None):
          
          try:
              cam_id = self.cameraByName(camera=camera, home=home)['id']
          except TypeError:
              logger.warning("personSeenByCamera: Camera name or home is unknown")
              return False
          #Check in the last event is someone known has been seen
          if self.lastEvent[cam_id]['type'] == 'person':
              if self.lastEvent[cam_id]['person_id'] in self._knownPersons():
                  return True
          return False
docs: Return True if someone known has been seen