Cannot setting hostname ESP32 (Arduino)

[alongkornchaisen001]

I'm use only WiFi.setHostname("MyHostname_ESP32"); but It's not work anymore.

My code

#include <ESPmDNS.h>
#include <WiFi.h>
 
const char* ssid = "My SSID";
const char* password =  "My Password";
 
void setup() {
  Serial.begin(115200);
 
  WiFi.begin(ssid, password);
  WiFi.setHostname("myHost_ESP");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("Connecting...\n\n");
  }
 
  if(mdns_init()!= ESP_OK){
    Serial.println("mDNS failed to start");
    return;
  }
 
  int nrOfServices = MDNS.queryService("http", "tcp");
   
  if (nrOfServices == 0) {
    Serial.println("No services were found.");
  } 
   
  else {
     
    Serial.print("Number of services found: ");
    Serial.println(nrOfServices);
     
    for (int i = 0; i < nrOfServices; i=i+1) {
 
      Serial.println("---------------");
       
      Serial.print("Hostname: ");
      Serial.println(MDNS.hostname(i));
 
      Serial.print("IP address: ");
      Serial.println(MDNS.IP(i));
 
      Serial.print("Port: ");
      Serial.println(MDNS.port(i));
 
      Serial.println("---------------");
    }
  }
 
}
 
void loop() {}

[alongkornchaisen001]

I change my some code and already fix it

#include <ESPmDNS.h>
#include <Arduino.h>
#include <Thing.h>
#include <WebThingAdapter.h>
#include <analogWrite.h>
#include <WiFi.h>

#define MIN(a,b) (((a)<(b))?(a):(b))
#define HOSTNAME "ESP32"

const char* ssid = "ssid";
const char* password = "password";

const int lampPin = LED_BUILTIN;


#define LEDC_CHANNEL_0     0
#define LEDC_TIMER_13_BIT  13
#define LEDC_BASE_FREQ     5000

WebThingAdapter* adapter;

const char* lampTypes[] = {"OnOffSwitch", "Light", nullptr};
ThingDevice lamp("mylamp", "My LED 2", lampTypes);

ThingProperty lampOn("on", "Whether the lamp is turned on", BOOLEAN, "OnOffProperty");
ThingProperty lampLevel("level", "The level of light from 0-100", NUMBER, "BrightnessProperty");

bool lastOn = false;

void ledcAnalogWrite(uint8_t channel, uint32_t value, uint32_t valueMax = 255) {
    uint32_t duty = (8191 / valueMax) * MIN(value, valueMax);
    ledcWrite(channel, duty);
}

void setup(void){
    pinMode(lampPin, OUTPUT);
    digitalWrite(lampPin, LOW); // initially off

    // Setup timer and attach timer to a led pin
    ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT);
    ledcAttachPin(lampPin, LEDC_CHANNEL_0);
    
    Serial.begin(115200);
    Serial.println("");
    Serial.print("Connecting to \"");
    Serial.print(ssid);
    Serial.println("\"");

    WiFi.mode(WIFI_STA);  
    WiFi.begin(ssid, password);
    WiFi.setHostname(HOSTNAME); 
    Serial.println("");   
    
    while (WiFi.status() != WL_CONNECTED) {     
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.print("Connected to ");
    Serial.println(ssid);
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    Serial.print("Subnet Mask: ");
    Serial.println(WiFi.subnetMask());
    Serial.print("Gateway IP: ");
    Serial.println(WiFi.gatewayIP());
    Serial.print("DNS 1: ");
    Serial.println(WiFi.dnsIP(0));
    Serial.print("DNS 2: ");
    Serial.println(WiFi.dnsIP(1));
    Serial.print("Hostname: ");
    Serial.println(WiFi.getHostname());
      
    adapter = new WebThingAdapter("led-lamp", WiFi.localIP());

    lamp.addProperty(&lampOn);
    lamp.addProperty(&lampLevel);
    adapter->addDevice(&lamp);
    adapter->begin();
    
    Serial.println("HTTP server started");
    Serial.print("http://");
    Serial.print(WiFi.localIP());
    Serial.print("/things/");
    Serial.println(lamp.id);

    #ifdef analogWriteRange
        analogWriteRange(255);
    #endif
}

void loop(void){
    adapter->update();
    int level = map(lampLevel.getValue().number, 0, 100, 255, 0);
    int levelShow = 255 - level;
   
    bool on = lampOn.getValue().boolean;
    digitalWrite(lampPin, on ? LOW : HIGH);
  
    if (lampOn.getValue().boolean) {

        Serial.print("Percent(%): ");
        Serial.println(lampLevel.getValue().number);
        ledcAnalogWrite(LEDC_CHANNEL_0, level);

        analogWrite(lampPin, level);
         
        Serial.print("level : ");
        Serial.println(levelShow);
        
        Serial.print(lamp.id);
        Serial.print(": ");
        Serial.println(on);

        Serial.println("*************************************");
    } else {
        Serial.print("Percent(%) : ");
        Serial.println(lampLevel.getValue().number);
        ledcAnalogWrite(LEDC_CHANNEL_0, 0);
        analogWrite(lampPin, 255); 
        
        Serial.print("Level : ");
        Serial.println(levelShow);
    
        Serial.print(lamp.id);
        Serial.print(": ");
        Serial.println(on);

        Serial.println("*************************************");
    }
    delay(500);
    lastOn = on;
}