Init commit with many years of arduino sketches and projects. I dont know if the esp8266 includes much, but there are also libraries. I hope they dont have crazy automatic versioning through the Arduino IDE.

Projects/libraries/Installed_libs/Ethernet/examples/UdpSendRaw/UdpSendRaw.pde

@@ -0,0 +1,40 @@
+#include <Ethernet.h>
+#include <UdpRaw.h>
+/* UdpSendRaw.pde: Example how to send packets over UDP using the UdpRaw library 
+ * to check for received packets on Unix-ish setup, execute:
+ * sudo tcpdump -ien0 "udp port 8000"
+ * bjoern@cs.stanford.edu 12/30/2008 */
+
+/* ETHERNET CONFIGURATION 
+ * ARDUINO: set MAC, IP address of Ethernet shield, its gateway,
+ * and local port to listen on for incoming packets */
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //MAC address to use
+byte ip[] = { 192, 168, 11, 200 }; // Arduino's IP address
+byte gw[] = { 192, 168, 11, 1 };   // Gateway IP address
+int localPort = 8888; //local port to listen on
+
+/* TARGET: set this to IP/Port of computer that will receive
+ * UDP messages from Arduino */
+byte targetIp[] = { 192, 168, 11, 15};
+int targetPort = 8000;
+
+/* A binary packet we'll send to our target - can contain 0x00 */
+byte packet[] = { 'h','e','l','l','o','\0','w','o','r','l','d','\0' };
+int packetLen = 12;
+
+
+void setup() {
+  Ethernet.begin(mac,ip,gw);
+  UdpRaw.begin(localPort);
+}
+
+void loop() {
+  // this version of sendPacket sends a zero-terminated string.
+  UdpRaw.sendPacket("hello, world.",targetIp,targetPort);
+  delay(1000);
+  
+  // this version sends an arbitrary buffer with specified length;
+  // buffer can contain '\0'
+  UdpRaw.sendPacket(packet,packetLen,targetIp,targetPort);
+  delay(1000);
+}