main.cpp

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#include <Arduino.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SPI.h>
 
// Network configuration for the RECEIVER PCB
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xEE};  // Unique MAC address
IPAddress staticIP(192, 168, 2, 101);  // Unique IP for the receiver
IPAddress gateway(192, 168, 2, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns(192, 168, 2, 1);
 
unsigned int localPort =
    5006;  // Port to listen on (must match sender's receiverPort)
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];  // Buffer to hold incoming packets
 
EthernetUDP udp;
 
// Define the Chip Select (CS) pin as a constant variable
const int ETH_CS_PIN = 6;
 
void setup() {
    Serial.begin(115200);
    while (!Serial)
        ;  // Wait for Serial Monitor to open
 
    Serial.println("Minimal UDP Receiver");
 
    // Initialize Ethernet using the variable
    Ethernet.init(ETH_CS_PIN);
    delay(1000);
 
    // Start the Ethernet connection and the UDP library
    Ethernet.begin(mac, staticIP, dns, gateway, subnet);
    udp.begin(localPort);
 
    Serial.print("Receiver IP: ");
    Serial.println(Ethernet.localIP());
    Serial.print("Listening on port ");
    Serial.println(localPort);
}
 
void loop() {
    // Check for incoming UDP packets
    int packetSize = udp.parsePacket();
    if (packetSize) {
        Serial.print("Received packet of size ");
        Serial.println(packetSize);
        Serial.print("From ");
        IPAddress remoteIp = udp.remoteIP();
        Serial.print(remoteIp);
        Serial.print(", port ");
        Serial.println(udp.remotePort());
 
        // Read the packet into the buffer
        int len = udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
        if (len > 0) {
            packetBuffer[len] = '\0';  // Null-terminate the string
        }
 
        Serial.println("Contents:");
        Serial.println(packetBuffer);
    }
}