ESP32 sethostname in arduino core 2.x not correct

[kroon040]

Board

LilyGO TTGO T-Camera ESP32-WROVER

Device Description

LilyGO TTGO T-Camera ESP32-WROVER

Hardware Configuration

nothing

Version

v2.0.1

IDE Name

Aruido IDE

Operating System

Linux

Flash frequency

80mhz

PSRAM enabled

no

Upload speed

921600

Description

In arduino core 1.06 is WiFi.setHostname ok and works with sketch below.

When switching to arduin core 2.x, it fail I see the hostname: esp32-88DB80

I should expect ESP32-Test, this I get switching to core 1.06

Sketch

#include <Arduino.h>
#include <WiFi.h>


const char *_ssid = "kroonen";
const char *_password = "password";


void setup() {
  WiFi.disconnect(true, true);
  Serial.begin(115200);
  while(!Serial) yield();
  Serial.println();

  Serial.println("### === ESP32 Wifi-Test v1.0 === ###");

  Serial.printf(" WiFi mode set to WIFI_STA: %s\n", WiFi.mode(WIFI_STA) ? "Success!" : "Failed!");
  Serial.printf(" Setting hostname: %s\n", WiFi.setHostname("ESP32-Test") ? "Success!" : "Failed!");
  WiFi.begin(_ssid, _password);

  // Warte auf Verbindung
  while ((WiFi.status() != WL_CONNECTED)) {
    delay(100);
    Serial.print(" ");
    Serial.print(WiFi.status());
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("");
    Serial.print(" Verbunden mit: ");
    Serial.println(WiFi.SSID());
    Serial.print(" IP address: ");
    Serial.println(WiFi.localIP());
    Serial.print("\n");
  }
  else {
    Serial.println("\n ERROR: WiFi Connection not possible!\n");
  }

}

void loop() {

}

Debug Message

10:41:47.280 -> 
10:41:47.280 -> ### === ESP32 Wifi-Test v1.0 === ###
10:41:47.479 ->  WiFi mode set to WIFI_STA: Success!
10:41:47.479 ->  Setting hostname: Success!
10:41:47.644 ->  6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 0 3
10:41:50.133 ->  Verbunden mit: kroonen
10:41:50.133 ->  IP address: 192.168.180.25
10:41:50.133 ->

Other Steps to Reproduce

core 1.06 works, 2.0 and higher fails

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[20162026]

Looks like setHostname() function only writes into temporary buffer that is then copied into low level network layer by the first WiFi.mode(WIFI_STA) call.

In your example moving WiFi.setHostname() above WiFi.mode() should solve the issue.

[kroon040]

Ok, that worked. Thnx.