code: def on_person_update(self, people):
          
          self.debug("()")
          changed = []
          with self._people_lock:
              for p in people:
                  person = Person.from_person(p)
                  if person.id not in self._people:
                      self.warning(u"{} not in audience".format(person.id))
                  self._people[person.id] = person
                  # Check if really changed? - trust source for now
                  changed.append(person)
          for plugin in self.plugins:
              try:
                  plugin.on_person_update(changed)
              except:
                  self.exception(
                      u"Failed to send updated people to {}".format(plugin.name)
                  )
docs: People have changed (e.g. a sensor value)
  
          :param people: People whos state changed (may include unchanged)
          :type people: list[paps.person.Person]
          :rtype: None