// subscribe on the client side - starts sending heartbeats
LiveDataSpecification subscription = new LiveDataSpecification(
dataServer.getDefaultNormalizationRuleSetId(),
ExternalId.of(identificationDomain, "USSw5 Curncy"));
CollectingLiveDataListener listener = new CollectingLiveDataListener();
valueDistributor.addListener(subscription, listener);
assertEquals(dataServer.getSubscriptions().size(), 0);
// subscribe on the server side
dataServer.subscribe(subscription, false);