Lab 3: TCP vs UDP Protocol Implementation

#include <WiFi.h>
#include <WiFiServer.h>
#include <WiFiClient.h>

const char* ssid = "your-network-name";
const char* password = "your-password";

WiFiServer server(80);

void setup() {
    Serial.begin(115200);
    
    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    
    Serial.println("WiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    
    // Start TCP server
    server.begin();
    Serial.println("TCP Server started on port 80");
}

void loop() {
    WiFiClient client = server.available();
    
    if (client) {
        Serial.println("New TCP client connected");
        
        while (client.connected()) {
            if (client.available()) {
                String request = client.readStringUntil('\n');
                Serial.println("Received: " + request);
                
                // Echo back with timestamp
                String response = "Echo: " + request + " [" + String(millis()) + "]\n";
                client.print(response);
                
                // Send sensor data simulation
                float temperature = 20.0 + random(0, 100) / 10.0;
                float humidity = 40.0 + random(0, 400) / 10.0;
                
                String sensorData = "SENSOR,TEMP:" + String(temperature) + 
                                  ",HUM:" + String(humidity) + "\n";
                client.print(sensorData);
            }
        }
        
        client.stop();
        Serial.println("TCP client disconnected");
    }
    
    delay(100);
}

#include <WiFi.h>
#include <WiFiClient.h>

const char* ssid = "your-network-name";
const char* password = "your-password";
const char* serverIP = "192.168.1.100"; // Server ESP32 IP
const int serverPort = 80;

WiFiClient client;

void setup() {
    Serial.begin(115200);
    
    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    
    Serial.println("WiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
}

void loop() {
    if (!client.connected()) {
        Serial.println("Connecting to TCP server...");
        if (client.connect(serverIP, serverPort)) {
            Serial.println("Connected to TCP server");
        } else {
            Serial.println("Connection failed");
            delay(5000);
            return;
        }
    }
    
    // Send data to server
    String message = "Hello from TCP client " + String(millis());
    client.println(message);
    Serial.println("Sent: " + message);
    
    // Read response
    unsigned long timeout = millis() + 5000;
    while (client.available() == 0 && millis() < timeout) {
        delay(10);
    }
    
    if (client.available()) {
        String response = client.readStringUntil('\n');
        Serial.println("Received: " + response);
    }
    
    delay(2000);
}

#include <WiFi.h>
#include <WiFiUdp.h>

const char* ssid = "your-network-name";
const char* password = "your-password";

WiFiUDP udp;
const int udpPort = 1234;
char packetBuffer[255];

void setup() {
    Serial.begin(115200);
    
    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    
    Serial.println("WiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    
    // Start UDP server
    udp.begin(udpPort);
    Serial.println("UDP Server started on port " + String(udpPort));
}

void loop() {
    int packetSize = udp.parsePacket();
    
    if (packetSize) {
        Serial.print("Received UDP packet of size ");
        Serial.print(packetSize);
        Serial.print(" from ");
        Serial.print(udp.remoteIP());
        Serial.print(":");
        Serial.println(udp.remotePort());
        
        // Read packet
        int len = udp.read(packetBuffer, 255);
        if (len > 0) {
            packetBuffer[len] = 0;
        }
        Serial.println("Contents: " + String(packetBuffer));
        
        // Send response back
        udp.beginPacket(udp.remoteIP(), udp.remotePort());
        
        // Send sensor data
        float temperature = 20.0 + random(0, 100) / 10.0;
        float humidity = 40.0 + random(0, 400) / 10.0;
        unsigned long timestamp = millis();
        
        String response = "SENSOR_DATA,TEMP:" + String(temperature) + 
                         ",HUM:" + String(humidity) + 
                         ",TIME:" + String(timestamp);
        
        udp.print(response);
        udp.endPacket();
        
        Serial.println("Sent response: " + response);
    }
    
    delay(10);
}