docs: private void setTempoMaster(DeviceUpdate newMaster) {
          DeviceUpdate oldMaster = tempoMaster.getAndSet(newMaster);
          if ((newMaster == null && oldMaster != null) ||
                  (newMaster != null && ((oldMaster == null) || !newMaster.getAddress().equals(oldMaster.getAddress())))) {
              // This is a change in master, so report it to any registered listeners
              deliverMasterChangedAnnouncement(newMaster);
          }
      }