Unable to establish connection to mosquitto broker from Arduino+ESP8266 - arduino

Question

I am using Arduino Uno and ESP8266 for WIFI connectivity. My Laptop on which mosquitto broker is running and Arduino(through ESP8266) is are both connected to wifi network. But I am unable to establish a connection to mqtt server.
I am using the follwing code.
#define FASTLED_INTERNAL
#include <SoftwareSerial.h>
#include <DHT.h>
#include <WiFiEsp.h>
#include <WiFiEspClient.h>
#include <WiFiEspUdp.h>
#include <PubSubClient.h>
#include <FastLED.h>
#define DHTPIN 2
#define DHTTYPE DHT11
#define ESP_RX 9
#define ESP_TX 8
#define WIFI_AP "Anurag"
#define WIFI_PASSWORD "qwerty12345"
#define NUM_LED 64
#define DATA_PIN 5
#define CLOCK_PIN 13
static const int RXPin = 4, TXPin = 3;
static const uint32_t baudRate = 9600;
static const int rainSensorMin = 0;
static const int rainSensorMax = 1024;
WiFiEspClient espClient;
PubSubClient mqttClient(espClient);
IPAddress broker(192,168,43,235);
SoftwareSerial ESP8266(ESP_RX, ESP_TX);
DHT dht(DHTPIN, DHTTYPE);
int status = WL_IDLE_STATUS;
char *ID = "uno";
char *TOPIC = "weatherStats";
int AT_cmd_time;
boolean AT_cmd_result = false;
CRGB leds[NUM_LED];
void setup() {
//pinMode(13, OUTPUT);
//FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LED);
Serial.begin(9600);
//ss.begin(baudRate);
initWiFi();
dht.begin();
mqttClient.setServer(broker,1883);
Serial.println("GPS, DHT11, and, Raindrop detector started.");
}
void loop() {
status = WiFi.status();
if ( status != WL_CONNECTED) {
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(WIFI_AP);
// Connect to WPA/WPA2 network
status = WiFi.begin(WIFI_AP, WIFI_PASSWORD);
delay(500);
}
Serial.println("Connected to AP");
}
delay(3000);
float h = dht.readHumidity();
float t = dht.readTemperature();
int rainReading = analogRead(A0);
int range = map(rainReading, rainSensorMin, rainSensorMax, 0, 2);
if(!mqttClient.connected()){
reconnect_mqtt();
}
mqttClient.loop();
mqttClient.publish(TOPIC,"one step forward");
//Serial.println("Satellites: " + String(gps.satellites.value()));
if (!isnan(h) || !isnan(t))
Serial.print("Temparture: " + String(t) + "°C | " + " Humidity: " + String(h) + " | ");
else {
Serial.println("Failed to obtain temparature and humidity data");
}
switch (range) {
case 0:
Serial.print("Rain Warning : 1");
break;
case 1:
Serial.print("Rain Warning : 0");
break;
}
Serial.println(" | Lat: 22.716191217468406 Lon: 72.44229199663788");
}
void initWiFi(){
ESP8266.begin(9600);
WiFi.init(&ESP8266);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true) {
}
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(WIFI_AP);
//Connect to WPA/WPA2 network
status = WiFi.begin(WIFI_AP, WIFI_PASSWORD);
}
}
void reconnect_mqtt(){
while(!mqttClient.connected()){
Serial.println("Attempting MQTT Connection");
if(mqttClient.connect(ID)){
Serial.println("MQTT connection established.");
Serial.print("Publishing to: ");
Serial.println(TOPIC);
}
else{
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
Runnig this code I keep getting output "try again in 5 seconds". Please help.