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/UdpString.cpp

@@ -0,0 +1,83 @@
+/*
+ * UdpString.cpp: Library to send/receive UDP packets with the Arduino ethernet shield
+ * using Tom Igoe/Hernando Barragan's WString library.
+ * Drop UdpString.h/.cpp from this distribution into the Ethernet library directory at 
+ * hardware/libraries/Ethernet/ 
+ * Then copy directory /libraries/String from this distribution to /hardware/libraries/String in
+ * your Arduino installation.
+ *
+ * MIT License:
+ * Copyright (c) 2008 Bjoern Hartmann
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * bjoern@cs.stanford.edu 12/30/2008
+ */
+
+extern "C" {
+#include "types.h"
+#include "w5100.h"
+#include "socket.h"
+}
+
+#include "Ethernet.h"
+#include "UdpString.h"
+
+/* Start UDP socket, listening at local port PORT */
+void UdpStringClass::begin(uint16_t port) {
+	_port = port;
+	_sock = 0; //TODO: should not be hardcoded
+	socket(_sock,Sn_MR_UDP,_port,0);
+}
+
+/* Is data available in rx buffer? Returns 0 if no, number of available bytes if yes. */
+int UdpStringClass::available() {
+	return getSn_RX_RSR(_sock);
+}
+
+/////////////////////////////////////////
+//Wstring functions
+int UdpStringClass::sendPacket(String str, byte * ip, unsigned int port) {
+	return (int)sendto(_sock,(const uint8_t *)str.cstr(),str.length(),ip,port);
+}
+
+int UdpStringClass::sendPacket(String str, int length, byte * ip, unsigned int port) {
+	return (int)sendto(_sock,(const uint8_t *)str.cstr(),length,ip,port);
+}
+
+int UdpStringClass::readPacket(String &str) {
+	uint8_t ip[4];
+	uint16_t port[1];
+	return readPacket(str,ip,port);
+}
+
+/* read packet into String str - if str is too short, expand its capacity */
+int UdpStringClass::readPacket(String &str, byte * ip, unsigned int *port) {
+	int len = available() -8; //skip UDP header
+	if(len <= 0) return 0;
+	if(len > str.capacity()) {
+		//packet is longer than string capacity - 
+		//resize string - this is very implementation dependent on WString
+		str = String(len);		
+		//fall through to read which should be ok now
+	}
+	return (int)recvfrom(_sock,(byte *)(str.cstr()),(uint16_t)str.capacity(),ip,port);
+}
+
+/* Create one global object */
+UdpStringClass UdpString;