ESP32 WiFiClient Library – localPort

/*
 * Author: Avant Maker
 * Date: February 24, 2025
 * Version: 1.0
 * Description: This example connects an ESP32
 * to www.httpbin.org on port 80, retrieves
 *  the local port number using ESP32 WiFiClient
 * Library's localPort method, and prints it to
 * the Serial Monitor to illustrate the ESP32’s
 * assigned port.
 
 This example demonstrates how to use 
 * ESP32 WiFiClient Library's available method to
 
 * License: MIT 
 * 
 * Code Source: This example code is sourced from the Comprehensive 
 * Guide to the ESP32 Arduino Core Library, accessible on 
 * AvantMaker.com. For additional code examples and in-depth 
 * documentation related to the ESP32 Arduino Core Library, 
 * please visit:
 *
 * https://avantmaker.com/references/esp32-arduino-core-index/
 *
 * AvantMaker.com, your premier destination for all things 
 * DIY, AI, IoT, Smart Home, and STEM projects. We are dedicated 
 * to empowering makers, learners, and enthusiasts with the resources
 * they need to bring their innovative ideas to life.
 */

#include <WiFi.h>

const char* ssid = "your-SSID";          // Replace with your Wi-Fi SSID
const char* password = "your-PASSWORD";  // Replace with your Wi-Fi password
const char* host = "www.httpbin.org";
const int port = 80;

void setup() {
    Serial.begin(115200);

    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\nConnected to WiFi");

    // Create a WiFiClient instance
    WiFiClient client;

    // Connect to the server
    if (client.connect(host, port)) {
        Serial.println("Connected to server");

        // Get the local port number
        uint16_t localPortNum = client.localPort();
        Serial.print("Local Port Number: ");
        Serial.println(localPortNum);

        // Send HTTP GET request
        client.println("GET /get HTTP/1.1");
        client.println("Host: www.httpbin.org");
        client.println("Connection: close");
        client.println();

        // Wait for server response
        while (client.connected()) {
            if (client.available()) {
                String line = client.readStringUntil('\n');
                Serial.println(line);
            }
        }
        client.stop();
        Serial.println("Disconnected");
    } else {
        Serial.println("Connection failed");
    }
}

void loop() {
    // Nothing to do here
}