@Override
  public String toString() {
    Connection result = clientToServerConn.get();
    if (result != null) {
      return result.toString();
    } else {
      return "SubscriptionConnectionImpl[" + getServer() + ":closed]";
    }
  }
Indicate that we have, or are about to send the client create message on this connection.

@return true if we have not yet sent client ready.
geode-core/src/main/java/org/apache/geode/cache/client/internal/QueueConnectionImpl.java