Arduino client freezes when trying to connect a socket

Question

I am working on a project that includes sockets on the local network - I want to make a Java server (a desktop application running on Windows) that will listen and establish connections with several clients - Arduino boards.

The problem is that the code is used when trying to establish a connection. Here's the Java code:

monitorThread = new Thread(() -> {
        try {
            System.out.println("Creating socket...");
            ServerSocket server = new ServerSocket(4444);
            while (true) {
                System.out.println("Waiting for connection...");
                Socket client = server.accept();
                //NetworkManager.this.didConnect(client);
                System.out.println("Did establish connection");
                if (delegate != null) {
                    delegate.didConnect(client);
                }
            }
        } catch (IOException exception) {
            System.out.print(exception);
        }
    });
    monitorThread.start();

and Arduino code

#include <SPI.h>
#include <Ethernet.h>

IPAddress serverIp(192, 168, 1, 101);
int serverPort = 4444;

byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEF
};
IPAddress ip(192, 168, 1, 178);

EthernetClient client;

void setup() {
  Ethernet.begin(mac, ip);

  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  delay(1000);
  // give the Ethernet shield a second to initialize:

  Serial.println("connecting...");

  if (client.connect(serverIp, serverPort)) {
    Serial.println("connected.");
  } else {
    Serial.println("connection failed.");
  }
}

What happens, both of them do not crash when trying to make a connection, but rather hang - the Java server freezes Socket client = server.accept();, but the Arduino also freezes - onclient.connect(serverIp, serverPort)

A computer running on a Java server has a static IP address (192.168.1.101).

, Java server.accept() - , , ( ), , , - , Arduino .

IP - , 64.233.187.99 (Google), .

? - , ? - ?

Answer 1

:

• Windows (Java Server)
• , (telnet), 192.168.1.101 4444 ( : telnet 192.168.1.101 4444)
• (1000) (5000), ethernet ethernet

. arduino Java. ; - . , telnet .