public ApnsServerSocketBuilder withService(ApnsServerService serverService) {
		this.serverService = serverService == null ? ApnsServerService.EMPTY
				: serverService;
		return this;
	}
Sets the delegate of the service, that gets notified of the status of
message delivery.

Note: This option has no effect when using non-blocking connections.
src/test/java/com/notnoop/apns/ApnsServerSocketBuilder.java