MQTT

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

// Update these with values suitable for your network.

char msg1[20];
char msgFresh[20];
char* subtop;
//char[] laggay = "FID";
//String str(laggay);
const char* ssid = "***";
const char* password = "***";
const char* mqtt_server = "192.168.1.1";
//String str1 = "";

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;
char msg[50];
int value = 0;

void setup_wifi() {

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

  WiFi.begin(ssid, password);

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

  randomSeed(micros());

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

void callback(char* topic, byte* payload, unsigned int length) {
//Serial.print("Message arrived [");
  //  Serial.print(topic);
    //Serial.print("] ");
//    for (int i = 0; i < length; i++) {
//      Serial.print((char)payload[i]);
//    }
String str(topic);
  delay(500);
//  Serial.print(length);
  if(str == "FID")
  {
    String str1;
    for (int i = 0; i < length; i++)
    {
      str1 += String((char *)payload)[i];
    }
    Serial.println(str1);
    Serial.print("---");
    if (str1 == "Denis")
    {
      Serial.println(" That's Denis");
      str1 = "";
    }
    else if(str1 == "Egor")
    {
      Serial.println(" That's Egor");
      str1 = "";
    }
    else if(str1 == "Varava")
    {
      Serial.println(" That's Sasha");
      str1 = "";
    }
    else if (str1 == "Unknown")
    {
      Serial.println("Somebody");
      str1 = "";
      }

  str1 = "";

  }
  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("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("FID");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  client.subscribe("FID");
}

void loop() {

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

}