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


const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* hivemq_server3 = "broker.hivemq.com";


String my_payload;
String my_topic;


WiFiClient WOKWI_client;
PubSubClient client(WOKWI_client);


const int potPin = 34;


void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);


  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);


  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }


  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}


void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");


    if (client.connect("WOKWI_client")) {
      Serial.println("connected");
      client.subscribe("ESP32_MORETTI");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}


// Callback
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");


  String conc_payload;
  for (int i = 0; i < length; i++) {
    conc_payload += ((char)payload[i]);
  }


  my_topic = topic;
  my_payload = conc_payload;
}


void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(hivemq_server3, 1883);
  client.setCallback(callback);
}


void Publicar_vel() {
  int potValue = analogRead(potPin);
  int velocidade = map(potValue, 0, 4095, 0, 100);
  client.publish("TOPICO_WOKWI_SENSOR1_VELO", String(velocidade).c_str());
  Serial.println("Velocidade: " + String(velocidade) + " km/h");
  Serial.println("---");
  delay(2000);
}


void loop() {
  reconnect();
  client.loop();
  Publicar_vel();
}