#include <Arduino.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

#include "config.h"

char packetBuffer[UDP_TX_PACKET_MAX_SIZE];
char ReplyBuffer[UDP_TX_PACKET_MAX_SIZE];

EthernetUDP Udp;

void setup() {
	Serial.begin(115200);
	Serial.println("Irrigation Arduino");

	Ethernet.init(ETHERNET_CS);
	IPAddress ip;
	ip.fromString(IP_ADDRESS);
	Ethernet.begin(mac, ip);

	if (Ethernet.hardwareStatus() == EthernetNoHardware) {
		Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
		while (true)
			delay(1);
	}

	if (Ethernet.linkStatus() == LinkOFF)
		Serial.println("Ethernet cable is not connected.");

	Udp.begin(IP_PORT);
}

void loop() {
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i=0; i < 4; i++) {
      Serial.print(remote[i], DEC);
      if (i < 3) {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort());

    // read the packet into packetBuffer
    Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.println(packetBuffer);

    // send a reply to the IP address and port that sent us the packet we received
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }
  delay(10);
}