public boolean hasReceivers()
    {
        return !lastSmTimestampNsByReceiverIdMap.isEmpty();
    }
@Test
    void shouldNotBeLiveIfNoReceiversAdded()
    {
        final ReceiverLivenessTracker receiverLivenessTracker = new ReceiverLivenessTracker();
        assertFalse(receiverLivenessTracker.hasReceivers());
    }