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

byte mac[] = { 0x04, 0xE9, 0xE5, 0x10, 0x00, 0x01 };  // Unique MAC address
IPAddress ip(192, 168, 1, 100);  // Sender IP address
IPAddress receiverIP(192, 168, 1, 101);  // Receiver IP address
unsigned int receiverPort = 8888;  // Port number to send data

EthernetUDP Udp;

// Create a 256-byte buffer to send
byte buffer[256];

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 shield not found!");
        while (true);  // Halt execution
    }

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

    Udp.begin(8888);  // Initialize UDP
    Serial.println("UDP Sender Ready");

    // Fill the buffer with some data (e.g., increasing bytes)
    for (int i = 0; i < 256; i++) {
        buffer[i] = i;  // Example: Fill with 0, 1, 2, ..., 255
    }
}

void loop() {
    Serial.println("Sending packet...");

    // Send the 256-byte buffer to the receiver
    if (Udp.beginPacket(receiverIP, receiverPort)) {
        Udp.write(buffer, 256);  // Send the full 256 bytes
        Udp.endPacket();
        Serial.println("Packet sent successfully");
    } else {
        Serial.println("Failed to start UDP packet");
    }

    //delay(1000);  // Wait for a second before sending the next packet
}