ESP32 Forum

Posted: **Thu Nov 24, 2022 6:38 pm**

Hi,
I am using WiFiClient to connect my ESP32 to a TCP server on my computer. Everything works nice until the server (PC) closes the connection.
When the server closes the connection, the function that returns the connection status waits exactly 100s before returning the connection status
When debugging in the terminal, you can see exactly when the server closed the connection. In terminal I see line like below

Code: [Select all] [Expand/Collapse]

[812835][D][WiFiClient.cpp:545] connected(): Disconnected: RES: 0, ERR: 128 

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How to make the function WiFiClient.connected() return the status immediately ? At the same time when the error message is written out ?

My code below

Code: [Select all] [Expand/Collapse]

 
.....
 
//Connecting to server
while(!RemoteClient.connect(server_host, server_port))
{
    Serial.println("Waiting beafore connect");
    delay(2500);
    ledState = !ledState;
    digitalWrite(LED_GREEN_PIN, ledState);
    Serial.print("Connecting to ");
    Serial.println(server_host);
}
......
 
void loop() {
 
 
if (RemoteClient.connected()) //<---- Here the program stops for 100s after the server breaks communication
{ 
....
}
else
{
  sleep(100);
  Serial.println("No connction with server. Reconnect");
  Serial.print(".");
  RemoteClient.stop();
  ConnectToServer();
 }
 
}
 

Bellow log from serial monitor

Code: [Select all] [Expand/Collapse]

 
27:35.591 -> [812835][D][WiFiClient.cpp:545] connected(): Disconnected: RES: 0, ERR: 128   
29:15.593 -> No connction with server. Reconnect
29:15.593 -> .Connecting to server                                                                  
29:38.255 -> [935514][D][WiFiClient.cpp:545] connected(): Disconnected: RES: 0, ERR: 128  
31:18.272 -> No connction with server. Reconnect
31:18.272 -> .Connecting to server                                                                 

ESP32 Forum

WiFi Client - TCP Communication

WiFi Client - TCP Communication