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I am trying to connect my arduino ethernet shield and a java application to communicate. I could not achieve that any one can help.

this is my java code

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package client;

import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

* @author amanuel Negash

public class Client extends Application {
// IO streams
DataOutputStream toServer = null;
DataInputStream fromServer = null;

@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
// Panel p to hold the label and text field
BorderPane paneForTextField = new BorderPane();
paneForTextField.setPadding(new Insets(5, 5, 5, 5));
paneForTextField.setStyle("-fx-border-color: green");
paneForTextField.setLeft(new Label("Enter a radius: "));

TextField tf = new TextField();

BorderPane mainPane = new BorderPane();
// Text area to display contents
TextArea ta = new TextArea();
mainPane.setCenter(new ScrollPane(ta));

// Create a scene and place it in the stage
Scene scene = new Scene(mainPane, 450, 200);
primaryStage.setTitle("Client"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage; // Display the stage

tf.setOnAction(e -> {
try {
// Get the radius from the text field
double radius = Double.parseDouble(tf.getText().trim());

// Send the radius to the server

// Get area from the server
double area = fromServer.readDouble();

// Display to the text area
ta.appendText("Radius is " + radius + "\n");
ta.appendText("Area received from the server is "
+ area + '\n');
catch (IOException ex) {
try {
SocketAddress sockaddr = new InetSocketAddress("", 59637);
// Create your socket
Socket socket = new Socket();
// Connect with 10 s timeout
socket.connect(sockaddr, 999999999);;

// Create an input stream to receive data from the server
fromServer = new DataInputStream(socket.getInputStream());

// Create an output stream to send data to the server
toServer = new DataOutputStream(socket.getOutputStream());
catch (IOException ex) {
ta.appendText(ex.toString() + '\n');

the following is my etherent arduino code

#include <ethernet.h>
#include <spi.h>
byte mac[] = {0x90, 0xf2, 0xda, 0x0e, 0x98, 0x34 };

EthernetClient client;
void setup() {
Serial.print("server is at ");

void loop() {
client = server.available();
char incoming;

if (client)
Serial.println("Client connected");
while(client.connected()) {
if (client.available()) {
incoming =;
Serial.println("Client disconnected");

What I have tried:

I have disabled the firewall and I can ping the server.
[no name] 18-Feb-18 18:55pm    
How about providing details of what actually happens. Where does it get to?

1 solution

nothing really happens the java client ends saying the Receive timed out
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