refactor and first ideas

src/main.cpp

@@ -1,9 +1,61 @@
 #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() {
-  // put your setup code here, to run once:
+	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() {
-  // put your main code here, to run repeatedly:
-}
+  // 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);
+}