private CacheClientProxy getClientProxy() {
    CacheClientNotifier notifier = getCacheServer().getAcceptor().getCacheClientNotifier();
    return notifier.getClientProxies().stream().findFirst().orElse(null);
  }
Create client cache and return the client connection pool's primary server port
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientWithInterestFailoverDistributedTest.java