我在作为服务器的计算机上有一个java程序，在充当客户机的esp上有一个程序。它们都连接到本地wifi，然后彼此连接。其目的是让计算机向esp发送一个号码。我曾设法让它们工作，但突然esp已停止连接到服务器。我花了相当长的时间试图弄清楚发生了什么，但我认为我没有改变什么。前一天他们都在一起工作，第二天就没有了。
这是我的java代码的主要部分，我相信它可以工作，尽管它可能并不理想（除此之外，还有一些函数可以用来制作一个小型gui和执行一些操作）：

createGUI();

        //looking for the arduino port, to get data from it
        SerialPort comPort = findArduinoPort();
        if (comPort != null) {
            System.out.println("Arduino port found: " + comPort.getSystemPortName());
        } else {
            System.out.println("Arduino port not found");
            System.exit(0);
        }

        comPort.openPort();
        comPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_SEMI_BLOCKING, 0, 0);

        InputStream inComPort = comPort.getInputStream();

        ServerSocket listener = new ServerSocket(8020);

        char lastRead;
        String data = new String("0");

        try{
            while(true){
                Thread.sleep(0);
                if(myStatus == status.ON) {
                    //read data from aduino serial
                    if (inComPort.available() > 0) {
                        data = "";
                        while (true) {
                            lastRead = (char)inComPort.read();
                            if (lastRead == '\r') {
                                lastRead = (char)inComPort.read();
                                break;
                            } else {
                                data += lastRead;
                            }
                        } 
                    }

                    System.out.println("Waiting for client");
                    //from my understanding the next line waits for the client to connect
                    Socket socket = listener.accept();
                    socket.setKeepAlive(true);
                    System.out.println("Client Connected");

                    try{
                        //i read data from the client, to make sure it's ready to receive
                        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                        System.out.println("Client response: " + in.readLine());

                        //I send the data to esp8266
                        BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                        System.out.println("Sending Message: " + data);
                        out.write(data);
                        out.flush();

                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        socket.close();
                    }
                }
            }
        } finally {
            try {
                inComPort.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            comPort.closePort(); 
            listener.close();
        }
    }

在写入控制台“waitingforclient”之后，它会等待一个客户端连接（据我所知，它工作正常）。这个问题与esp8266中的代码有关

# include <ESP8266WiFi.h>

# include <LiquidCrystal.h>

//wifi data

# define NAME "i_put_my_wifi_here"

# define PASSWORD "i_put_my_wifi_pw_here"

String host = "i_put_my_computer_ip_here";
const int port = 8020;
WiFiClient client;

//lcd display to write the data to
LiquidCrystal lcd(D2, D3, D5, D6, D7, D8);

void setup() {
  Serial.begin(115200);
  //lcd setup
  lcd.begin(16, 2);
  lcd.print("Puntamenti:");
  lcd.setCursor(0, 1);
  lcd.print("0");

  WiFi.mode(WIFI_STA);
  WiFi.begin(NAME, PASSWORD);
  Serial.print("\nConnecting to wifi");

  while(WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.println("Connected\n");

}

void loop() {
  //i try to conect to the server
  if (client.connect(host, port))
  {
    Serial.print("Connected to host: ");
    Serial.println(host);

    //i tell the server i'm ready for data
    client.println("Connected");

    Serial.print("Wating for data");
    int i = 0;
    while(true){
      if(client.available() == 0){
        Serial.print(".");
        i++;
        if(i >= 10){
          break;
        }
        delay(1000);
      } else {
        lcd.setCursor(0, 1);
        String streamData = client.readStringUntil('\n');
        lcd.print(streamData);
        Serial.print("\nData received: ");
        Serial.println(streamData);
        break;
      }
    }
    client.stop();
  } else {
    Serial.println("Connection to host failed");
  }
  delay(1000);
}

所以我的问题来自client.connect（主机，端口）。上次我试过这些程序，效果很好。结果是真的，剩下的就发生了。然而，从今天起，它总是错误的，所以esp连接到wifi，就像计算机一样，但是它总是无法连接到等待它的服务器。我不明白问题出在哪里，尤其是它以前工作得很好，现在已经不工作了。