esp_mqtt_test1.ino

#include <ESP8266WiFi.h>
#include <Wire.h>
#include <PubSubClient.h>
//#include <Adafruit_HDC1000.h>

#define wifi_ssid "EPOL_kd@012"
//#define wifi_ssid "babilons"
#define wifi_password "epolepol"
//#define wifi_password ""

#define mqtt_server "m21.cloudmqtt.com"
#define mqtt_user "vmhckgfz"
#define mqtt_password "u4Ld1RLbnV_C"
#define mqtt_port 19716

#define humidity_topic "sensor/humidity"
#define temperature_topic "sensor/temperature"

WiFiClient espClient;
PubSubClient client(espClient);
//Adafruit_HDC1000 hdc = Adafruit_HDC1000();

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);

  // Set SDA and SDL ports
  Wire.begin(2, 14);

  // Start sensor
//  if (!hdc.begin()) {
//    Serial.println("Couldn't find sensor!");
//    while (1);
//  }
}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(wifi_ssid);

  WiFi.begin(wifi_ssid, wifi_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() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    // If you do not want to use a username and password, change next line to
    // if (client.connect("ESP8266Client")) {
    if (client.connect("ESP8266Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

//bool checkBound(float newValue, float prevValue, float maxDiff) {
//  return !isnan(newValue) &&
//         (newValue < prevValue - maxDiff || newValue > prevValue + maxDiff);
//}

long lastMsg = 0;
float temp = 0.0;
float hum = 0.0;
float diff = 1.0;

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

  long now = millis();
  if (now - lastMsg > 1000) {
    lastMsg = now;
client.publish(temperature_topic, "dupka1", true);
//    float newTemp = hdc.readTemperature();
//    float newHum = hdc.readHumidity();

//    if (checkBound(newTemp, temp, diff)) {
//      temp = newTemp;
//      Serial.print("New temperature:");
//      Serial.println(String(temp).c_str());
//      client.publish(temperature_topic, String(temp).c_str(), true);
//    }
//
//    if (checkBound(newHum, hum, diff)) {
//      hum = newHum;
//      Serial.print("New humidity:");
//      Serial.println(String(hum).c_str());
//      client.publish(humidity_topic, String(hum).c_str(), true);
//    }
  }
}