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/UdpSendString/UdpSendString.pde

@@ -0,0 +1,48 @@
+#include <Ethernet.h>
+#include <UdpString.h>
+#include <WString.h>
+
+/* UdpSendString.pde: Example how to send packets over UDP using the String library 
+ * to check for received packets on Unix-ish setup, execute:
+ * sudo tcpdump -A -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;
+
+/* Strings hold the packets we want to send */
+String asciiString;
+String binaryString(4); // if we want to send non-ASCII, we have to provide a capacity for the String
+
+void setup() {
+  Ethernet.begin(mac,ip,gw);
+  UdpString.begin(localPort);
+  
+  asciiString = "Hello, World";
+  
+  binaryString.getBytes()[0]=0x00;
+  binaryString.getBytes()[1]=0x01;
+  binaryString.getBytes()[2]=0x02;
+  binaryString.getBytes()[3]=0x03;
+}
+
+void loop() {
+  // send a normal, zero-terminated string.
+  UdpString.sendPacket(asciiString,targetIp,targetPort);
+  delay(1000);
+  
+  // sends a binary string that can contain 0x00 in the middle
+  // you have to specify the length;
+  UdpString.sendPacket(binaryString,binaryString.capacity(),targetIp,targetPort);
+  delay(1000);
+}