问为什么加利福尼亚在使用CoAP协议发送数据时等待65535条记录

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public class HelloWorldServer extends CoapServer {
    /*
     * Application entry point.
     */
    public static void main(String[] args) {
        try {
            // create server
            HelloWorldServer server = new HelloWorldServer();
            server.start();
        } catch (SocketException e) {
            System.err
                    .println("Failed to initialize server: " + e.getMessage());
        }
    }

    /*
     * Constructor for a new Hello-World server. Here, the resources of the
     * server are initialized.
     */
    public HelloWorldServer() throws SocketException {
        // provide an instance of a Hello-World resource
        add(new HelloWorldResource());
    }

    /*
     * Definition of the Hello-World Resource
     */
    class HelloWorldResource extends CoapResource {
        public HelloWorldResource() {
            // set resource identifier
            super("helloWorld");
            // set display name
            getAttributes().setTitle("Hello-World Resource");
        }

        @Override
        public void handleGET(CoapExchange exchange) {
            // respond to the request
            exchange.respond("Hello World!");
        }

        @Override
        public void handlePOST(CoapExchange exchange){
            //System.out.println("Start "+System.currentTimeMillis());
            exchange.accept();           
            //List<String> queries = exchange.getRequestOptions().getURIQueries();
        //    System.out.println("Text Received : "+ exchange.getRequestText().length());
        //    System.out.println("End "+System.currentTimeMillis());
            exchange.respond("Received");


        }
    }
}

try {           

            long startTime = System.currentTimeMillis();
            for (int i = 0; i < 1000000; i++) {
                CoapClient client = new CoapClient(new URI("coap://192.168.15.170:5683/helloWorld"));
                CoapResponse response = client.post(str, 0);            

            }
            System.out.println("done");         
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }catch (Exception e) {
            e.printStackTrace();
        }