NODEMCU_sketch

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

#define interruptPin D1

const char* ssid = "Jorge 2.4";
const char* password = "";
const char* mqtt_server = "iot.eclipse.org";

WiFiClient espClient;
PubSubClient mqttClient(espClient);

long lastReconnectAttempt = 0;
String message = "";
int timer = millis();
void callback(char* topic, byte* payload, unsigned int length) {
  message = "";
  for (int i = 0; i < length; i++) {
    message += (char) payload[i];
  }
  message.toLowerCase();
  message.trim();
}

boolean reconnect() {
  String clientId = "ESP8266Client-";
  clientId += String(random(0xffff), HEX);

  if (mqttClient.connect(clientId.c_str())) {
    mqttClient.publish("julinho/enable", "1");
    mqttClient.publish("julinho/sos", "0");
    mqttClient.subscribe("julinha/rota");
  }

  return mqttClient.connected();
}

void setup() {
  Serial.begin(9600);
  WiFi.begin(ssid, password);
  pinMode(interruptPin, OUTPUT);
  digitalWrite(interruptPin, HIGH);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  mqttClient.setServer(mqtt_server, 1883);
  mqttClient.setCallback(callback);
  Serial.println("Setup feito");
}

void loop() {
  if (!mqttClient.connected()) {
    long now = millis();
    if (now - lastReconnectAttempt > 5000) {
      lastReconnectAttempt = now;
      if (reconnect()) {
        lastReconnectAttempt = 0;
      }
    }
    return;
  }
  if (Serial.available()) {
    String messageCheck = Serial.readString();
    char check[messageCheck.length()];
    messageCheck.toCharArray(check, messageCheck.length());
    mqttClient.publish("julinho/check", check);
  }

  boolean routeExists = message.compareTo("") != 0;

  if (!routeExists) {
    delay(100);
    mqttClient.loop();
    return;
  }

  digitalWrite(interruptPin, LOW);
  Serial.print(message);
  message = "";
  delay(2000);
  ESP.deepSleep(30e6);
  delay(100);

}