ESP-12F Relay 30A 8 Channel-mqtt

// mosquitto_sub -h broker.mqtt-dashboard.com -t /myrelay/status
//mosquitto_sub -h broker.mqtt-dashboard.com -t /myrelay/cnt
//control
//mosquitto_pub -h broker.mqtt-dashboard.com -t /myrelay/control -m 7
// again untuk mematikan
// mosquitto_pub -h broker.mqtt-dashboard.com -t /myrelay/control -m 7


#include <ESP8266WiFi.h>
#include <PubSubClient.h>

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

// Definisikan informasi broker MQTT
const char* mqtt_server = "broker.mqtt-dashboard.com";
//broker.emqx.io
//broker.hivemq.com


const int mqtt_port = 1883;
const char* mqtt_username = ""; // Biarkan kosong jika tidak ada
const char* mqtt_password = ""; // Biarkan kosong jika tidak ada

// Inisialisasi koneksi WiFi
WiFiClient espClient;

// Inisialisasi koneksi MQTT
PubSubClient client(espClient);

// Daftar status relay (0 = OFF, 1 = ON)
int relayStatus[8] = {0, 0, 0, 0, 0, 0, 0, 0};

int rly1 = 16;
int rly2 = 14;
int rly3 = 12;
int rly4 = 13;
int rly5 = 15;
int rly6 = 0;
int rly7 = 4;
int rly8 = 5;
int relayPins[8] = {rly1, rly2, rly3, rly4, rly5, rly6, rly7, rly8};

unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;

void setup() {
  // Mulai Serial
  Serial.begin(115200);

    // Inisialisasi pin relay sebagai OUTPUT
  for (int i = 0; i < 8; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW);
  }

  // Sambungkan ke WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Menghubungkan ke WiFi...");
  }
  Serial.println("Terhubung ke WiFi");

  // Tampilkan alamat IP yang diperoleh dari router/hotspot
  Serial.print("Alamat IP: ");
  Serial.println(WiFi.localIP());

  // Sambungkan ke broker MQTT
  client.setServer(mqtt_server, mqtt_port);
  // Gunakan ini jika broker MQTT memerlukan otentikasi
  // client.setCredentials(mqtt_username, mqtt_password);

  // Langsung subscribe ke topik yang Anda inginkan
  client.setCallback(callback);
  client.subscribe("/myrelay/control");
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    ++value;
    snprintf (msg, MSG_BUFFER_SIZE, "send data #%ld", value);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("/myrelay/cnt", msg);
  }

  // Periksa status relay dan kendalikan relay di sini sesuai kebutuhan
  for (int i = 0; i < 8; i++) {
    // Contoh: Mengaktifkan relay jika status adalah 1, mematikan jika status adalah 0
    int rlystat=relayStatus[i] == (1 ? HIGH : LOW);
    digitalWrite(relayPins[i], rlystat);
    // Serial.printf("status relay callback'%d': \n\r", rlystat);
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  // Serial.print("Pesan yang diterima pada topik '");
  // Serial.print(topic);
  // Serial.print("': ");
  Serial.printf("Pesan yang diterima pada topik '%s': \n\r", topic);

    String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.print("isi payload: ");
  Serial.println(message);

  // Periksa pesan dan ubah status relay sesuai kebutuhan
  if (strcmp(topic, "/myrelay/control") == 0) {
    int relayNumber = message.toInt();
    if (relayNumber >= 0 && relayNumber < 8) {
      relayStatus[relayNumber] = 1 - relayStatus[relayNumber]; // Toggle relay status
      Serial.printf("status relay %d:   arrayRLY %d: \n\r", relayNumber, relayStatus[relayNumber]);
      publishRelayStatus(relayNumber);
    }
  }
}

void publishRelayStatus(int relayNumber) {
  String topic = "/relay/status/" + String(relayNumber);
  String payload = String(relayStatus[relayNumber]);
  client.publish(topic.c_str(), payload.c_str());
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("/myrelay/status", "Reconnect");
      // ... and resubscribe
      client.subscribe("/myrelay/control");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}