Client isn´t connecting to ESP32 server

[Natalia1400]

I wrote a code that reads sensor data and sends it to LabVIEW and also writes data from labview to the controller. I´m doing it trough the TCP/IP protocol but I´m having trouble connecting the esp32 and labview. I´m supposed to be able to see on the serial monitor if a client is connected but nothing comes up and I also get a LabVIEW error that means either that the server refused the connection or that the server hasn't been started but I haven´t been able to figure out what is wrong with my code since I have followed multiple examples that I´ve found online. Could anyone help me figure out if something is missing?

//Se incluye librería para el WiFi
#include <WiFi.h>
//Se define el número del puerto como "8000"
#define SERVER_PORT 8000
//Se definen nombre de red y contraseña a la que se va a conectar el controlador
const char* ssid="";
const char* pass="";

//Se configura el servidor con el puerto 8000
WiFiServer server (SERVER_PORT);

//Se conectan los sensores a los pines 36, 39, 34 y 35
int sensor2=36;
int sensor3=39;
int sensor4=34;
int sensor5=35;

//Se conectan los relé a los pines 23, 22, 21 y 19
int led1=23;
int led2=22;
int led3=21;
int led4=19;

char labview=0;

void setup() {

Serial.begin(115200);

//Se inicia la conexión a la red WiFi definida
WiFi.begin (ssid,pass);
delay(2000);

//Mostrar asteriscos mientras se realiza la conexión
while (WiFi.status() != WL_CONNECTED){
  delay(500);
  Serial.print("*");
}

//Se anuncia cuando ya se haya conectado a la red WiFi y se muestra la dirección IP que será usada para el código en LabVIEW
Serial.println("");
Serial.println("Se ha conectado a la red WiFi");
Serial.println("Dirección IP: ");
Serial.println(WiFi.localIP());



// Se establecen los sensores como entrada
pinMode(sensor2,INPUT);
pinMode(sensor3,INPUT);
pinMode(sensor4,INPUT);
pinMode(sensor5,INPUT);

//Se establecen los relé como salida
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);

}

void loop() {

//Conectar con cliente
WiFiClient client = server.available();

if (client){   
Serial.println("New Client");

while(client.available()){

  uint8_t data =client.read();  
  Serial.write(data);

//Calibración del sensor 2********************************
int humedad2=analogRead(sensor2);
//int humedad1=334*humedad-81;
int porcentaje2=map(humedad2, 579,252,0,100);

//Calibración del sensor 3**********************************
int humedad3=analogRead(sensor3);
//int humedad1=334*humedad-81;
int porcentaje3=map(humedad3, 579,252,0,100);

//Calibración del sensor 4**********************************
int humedad4=analogRead(sensor4);
//int humedad1=334*humedad-81;
int porcentaje4=map(humedad4, 579,252,0,100);

//Calibración del sensor 5**********************************
int humedad5=analogRead(sensor5);
//int humedad1=334*humedad-81;
int porcentaje5=map(humedad5, 579,252,0,100);

if (Serial.available()>0)
{

//Se define si se enciende o apaga LED1**************************************
 int labview=Serial.read();
if (labview=='0')
{ 
digitalWrite(led1,LOW); 
}
 if (labview=='1')
 {  
digitalWrite(led1, HIGH);
}

//Se define si se enciende o apaga LED2****************************************
//int labview=Serial.read();
if (labview=='2')
{  
digitalWrite(led2,LOW);
}
 if (labview=='3')
 {  
digitalWrite(led2, HIGH);
}

//Se define si se enciende o apaga LED3****************************************
//int labview=Serial.read();
if (labview=='4')
{ 
digitalWrite(led3,LOW); 
}
 if (labview=='5')
 {  
digitalWrite(led3, HIGH);
}

//Se define si se enciende o apaga LED4****************************************
//int labview=Serial.read();
if (labview=='6')
{ 
digitalWrite(led4,LOW); 
}
 if (labview=='7')
 { 
digitalWrite(led4, HIGH);
}

}
Serial.println(porcentaje2);
client.println(porcentaje2);

Serial.println(porcentaje3);
client.println(porcentaje3);

Serial.println(porcentaje4);
client.println(porcentaje4);

Serial.println(porcentaje5);
client.println(porcentaje5);
}



delay(1000);
}
}

[apf1979]

I haven't used the ESP wireless capabilities, but if you're not hosting an access point, are you sure that all the relevant firewalls are allowing traffic? Maybe try a direct connection if you aren't already.

[gcjr]

are you specifying both the IP and port (8000)?

[Natalia1400]

I already made sure that the firewalls aren´t blocking the communication. When I use the serial port with the board the code works well

[Natalia1400]

Yes, I already specified them in my LabVIEW code

[apf1979]

You haven't posted your Labview code, but another user recently had an issue where not putting in a delay in between port open and read was causing issues. Can you post your labview code and test a delay in that code.

[Natalia1400]

I can´t upload the LabVIEW code because of the format. I do have a 90000 ms timeout in the port open function but it still doesn´t work. Is that what you meant by the delay?

[apf1979]

Maybe it was between read and write. I've been trying to search for the old post but haven't been able to find it yet.

[Natalia1400]

So I kind of got it working now, I used the server.begin() command and it now connects to LabVIEW but I have a new problem. After around 2 minutes of the connection i get a LabVIEW error that says that the network connection was closed by the peer. For some reason the ESP32 is closing the connection but I haven´t figured out why, or how to connect it again automatically after the client disconnects

[apf1979]

I use this for staying connected to a PLC. Maybe it'll help?

  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Connection_LED_Red();
  } else {
    if (Ethernet.linkStatus() == 1) {
      if (!ethClient.connected()) {
        ethClient.stop();
        if (ethClient.connect(server, TCP_Client_Port)) {
          Serial.println(F("Connected to server"));
        }
      }
      if (ethClient.connected()) {
        Connection_LED_Green();
        TCP_Communications();
      }
      if (!ethClient.connected()) Connection_LED_White();
    } else {
      Connection_LED_Blue();
    }
  }