ESP32 Forum

Posted: **Wed Oct 17, 2018 11:28 pm**

Hello,

When using the Arduino IDE and the ESP8266 we declare a global WiFiServer before the setup() code like this:

WiFiServer myServer(0);  // to be changed later at run-time

and later in the setup code or in the loop code we can change the listening port like this:

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myServer.begin(myPort);

This is useful when the port number for TCP communication is not previously defined or when it is defined by the user during a setup phase.

Unfortunately this does not work with the ESP32. If we do the same we got this error:

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no matching function for call to 'WiFiServer::begin(unsigned int&)'

I wonder if there is a way to bypass this problem without fixing "à priori" the port number.

Regards, Luis

Posted: **Thu Oct 18, 2018 11:24 am**

begin does not take a parameter.

I think you can just repeat the instance using myServer(myPort); before doing the begin.

Posted: **Fri Oct 19, 2018 10:06 am**

Hello again,

I am sorry for my post. Actually it is possible to change the TCP port at run time as we do with the ESP8266. I was not using the 1.0.0 ESP32 core for Arduino. Once installed the begin method accepts a parameter and there is no error.

Regards Luis

Posted: **Fri Oct 19, 2018 10:20 am**

I see now the port argument has been added into to later versions than I had.

That's good. Time to update.

ESP32 Forum

Changing TCP listening port not possible on the ESP32

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