#include <math.h> 
#include <WiFi.h>
#include <PubSubClient.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqtt_server = "mqtt.eclipseprojects.io"; // Example public broker
const char* mqtt_topic = "esp32/test/topic"; // Topic to subscribe to
WiFiClient espClient;
PubSubClient client(espClient);

void connectMQTT() {
  while (!client.connected()) {
  Serial.println("Attempting MQTT connection...");

// Create a unique client ID
String clientId = "ESP32Client-" + String(random(0xffff), HEX);
if (client.connect(clientId.c_str())) {
Serial.println("Connected to MQTT broker");

client.subscribe(mqtt_topic);
} else {
   Serial.print("Failed to connect, state: ");
   Serial.println(client.state());
   delay(5000);
  }
 }
}


void callback(char* topic, byte* payload, unsigned int length) {
  String message = "";
  for (int i = 0; i < length; i++) {
  message += (char)payload[i];
  }
 Serial.print("Received message: ");
 Serial.println(message);
}

const int pwmPin = 13;
const int frequency = 5000; 
const uint8_t resolution = 8; 

const float fixedDutyCyclePercent = 75.0;

const uint32_t maxDutyCycle = (1 << resolution) - 1;

uint32_t percentageToDuty(float percentage) {
 if (percentage < 0.0) {
    percentage = 0.0;
  } else if (percentage > 100.0) {
     percentage = 100.0;
   }

return (uint32_t)round((percentage / 100.0) * maxDutyCycle);
}

void connectWiFi() {
   Serial.begin(115200);
   WiFi.begin(ssid, password);
   while (WiFi.status() != WL_CONNECTED) {
   delay(1000);
   Serial.println("Connecting to WiFi...");
   Serial.println("WiFi Connected");
   Serial.print("IP Address: ");
   Serial.println(WiFi.localIP());
}

void setup() {
   connectWiFi();
}

void setup() {
    Serial.begin(115200);
   Serial.println("ESP32 Fixed PWM (Percentage Input) Example (Pin-Based API)");
   // 1. Configure and attach the PWM pin using LEDC
   ledcAttach(pwmPin, frequency, resolution);
   Serial.printf("Attached PWM to GPIO %d\n", pwmPin);
   Serial.printf("Frequency: %d Hz, Resolution: %d bits (Max Duty Value: %u)\n",frequency, resolution, maxDutyCycle);
   uint32_t calculatedDutyValue = percentageToDuty(fixedDutyCyclePercent);
   Serial.printf("Requested Duty Cycle: %.2f %%\n", fixedDutyCyclePercent);
   Serial.printf("Calculated Raw Duty Value: %u\n", calculatedDutyValue);
   ledcWrite(pwmPin, calculatedDutyValue);
   Serial.printf("Set fixed duty cycle %u on pin %d\n", calculatedDutyValue,pwmPin);
   Serial.println("PWM signal is now active.");
}

void loop() {
  delay(1000);
}