#include <NativeEthernet.h>
#include <NativeEthernetUdp.h>

byte mac[] = { 0x04, 0xE9, 0xE5, 0x10, 0x00, 0x02 };  // Unique MAC address for receiver
IPAddress ip(192, 168, 1, 101);  // Receiver IP address
unsigned int localPort = 8888;  // Port number to listen on

EthernetUDP Udp;
byte packetBuffer[256];  // Buffer to hold received data

void setup() {
    Serial.begin(115200);
    //while (!Serial);  // Wait for Serial Monitor

    Serial.println("Initializing Ethernet...");
    Ethernet.begin(mac, ip);

    if (Ethernet.hardwareStatus() == EthernetNoHardware) {
        Serial.println("Ethernet hardware not found!");
        while (true);  // Halt execution
    }

    if (Ethernet.linkStatus() == LinkOFF) {
        Serial.println("Ethernet cable not connected!");
    }

    Udp.begin(localPort);  // Start listening on the specified port
    Serial.println("UDP Receiver Ready");
}

void loop() {
    int packetSize = Udp.parsePacket();
    
    if (packetSize) {
        Serial.print("Received packet of size: ");
        Serial.println(packetSize);

        // Read the 256 bytes into packetBuffer
        int len = Udp.read(packetBuffer, sizeof(packetBuffer));
        
        if (len > 0) {
            packetBuffer[len] = 0;  // Null-terminate buffer for string output (optional)
            Serial.print("Message: ");
            for (int i = 0; i < len; i++) {
                // Print the received data (in decimal for example)
                Serial.print(packetBuffer[i], DEC);
                Serial.print(" ");
            }
            Serial.println();
        }
    }
}