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

const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";
const char* mqtt_server = "YOUR_MQTT_BROKER_IP";

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, 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() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("arduinoClient")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  // Your sensor data collection and transmission code here
  client.publish("sensorDataTopic", "YourDataHere");
  delay(1000); // Adjust as needed
}

/*To achieve wireless data transmission using MQTT (Message Queuing Telemetry Transport) or HTTP (Hypertext Transfer Protocol) with an Arduino Uno, you'll need additional hardware to handle Wi-Fi or Ethernet communication. For this purpose, you can use an ESP8266 module for Wi-Fi connectivity or an Ethernet shield for Ethernet connectivity. Below, I'll provide example code for both MQTT and HTTP transmission using an ESP8266 module.

Firstly, you need to make sure you have the necessary libraries installed. For MQTT, you'll need the PubSubClient library, and for HTTP, you can use the ArduinoHttpClient library.

Here's how you can transmit data using MQTT:
Replace placeholders like YOUR_WIFI_SSID, YOUR_WIFI_PASSWORD, YOUR_MQTT_BROKER_IP, YOUR_SERVER_IP, and yourEndpoint with your actual Wi-Fi credentials, MQTT broker IP address, server IP address, and HTTP endpoint respectively.

Remember that using an ESP8266 module for Wi-Fi communication allows for easier integration with MQTT or HTTP protocols on an Arduino Uno. However, if you're using an Ethernet shield, you'll need to find compatible libraries and adjust the code accordingly.*/