esp8266
diff --git a/‎libraries/esp8266/examples/IPv6/IPv6.ino
Lines changed: 57 additions & 16 deletions b/‎libraries/esp8266/examples/IPv6/IPv6.ino
Lines changed: 57 additions & 16 deletions
@@ -21,55 +21,61 @@
 */
 
 #include <ESP8266WiFi.h>
+#include <WiFiUdp.h>
 
 #define SSID "ssid"
 #define PSK  "psk"
 
-#define FQDN  "www.google.com" // with both IPv4 & IPv6 addresses
-#define FQDN6 "par21s04-in-x04.1e100.net" // does not resolve in IPv4 (wanted: better example)
+#define FQDN  F("www.google.com") // with both IPv4 & IPv6 addresses
+#define FQDN6 F("par21s04-in-x04.1e100.net") // does not resolve in IPv4 (wanted: better example)
 #define STATUSDELAY_MS 30000
+#define TCP_PORT 23
+#define UDP_PORT 1111
 
-WiFiServer statusServer(23);
+WiFiUDP udp;
 
 void fqdn (Print& out, const String& fqdn) {
-  out.print("resolving ");
+  out.print(F("resolving "));
   out.print(fqdn);
-  out.print(": ");
+  out.print(F(": "));
   IPAddress result;
   if (WiFi.hostByName(fqdn.c_str(), result)) {
     result.printTo(out);
     out.println();
   } else
-    out.println("timeout or not found");
+    out.println(F("timeout or not found"));
 }
 
 void status (Print& out) {
   out.println();
 
-  out.print("address= ");
+  out.print(F("address= "));
   WiFi.localIP().printTo(out);
   out.println();
-  out.print("gateway= ");
+  out.print(F("gateway= "));
   WiFi.gatewayIP().printTo(out);
   out.println();
-  out.print("netmask= ");
+  out.print(F("netmask= "));
   WiFi.subnetMask().printTo(out);
   out.println();
 
   for (int i = 0; i < 3; i++) {
-    out.print("dns");
+    out.print(F("dns"));
     out.print(i);
-    out.print("= ");
+    out.print(F("= "));
     WiFi.dnsIP(i).printTo(out);
     out.println();
   }
 
 #if LWIP_IPV6
-  out.println("Try me at these addresses (with 'telnet <addr>'):");
-  out.print("IPv6   link-scope(intranet)= ");
+  out.println(F("Try me at these addresses:"));
+  out.println(F("(with 'telnet <addr>')"));
+  out.println(F("(with 'nc -u <addr> 1111')"));
+  out.print(F("IPv6   link-scope(intranet)= "));
   WiFi.localIP6Link().printTo(out);
   out.println();
-  out.print("IPV6 global-scope(internet)= ");
+  out.print(F("IPV6 global-scope(internet)= "));
   WiFi.localIP6Global().printTo(out);
   out.println();
 #endif
@@ -87,22 +93,29 @@ void setup() {
   Serial.println();
   Serial.println(ESP.getFullVersion());
 
+  WiFi.setSleepMode(WIFI_NONE_SLEEP);
   WiFi.mode(WIFI_STA);
   WiFi.begin(SSID, PSK);
   while (WiFi.status() != WL_CONNECTED)
   {
     Serial.print('.');
     delay(500);
   }
-  Serial.println("connected");
+  Serial.println(F("connected: "));
 
   statusServer.begin();
+  udp.begin(UDP_PORT);
+
+  Serial.print(F("TCP server on port "));
+  Serial.print(TCP_PORT);
+  Serial.print(F(" - UDP server on port "));
+  Serial.println(UDP_PORT);
 }
 
 unsigned long statusTimeMs = 0;
 
 void loop() {
-  
+
   if (statusServer.hasClient()) {
     WiFiClient cli = statusServer.available();
     cli.setNoDelay(0); // should be default, was not default
@@ -111,6 +124,34 @@ void loop() {
     cli.stop();
   }
 
+  // if there's data available, read a packet
+  int packetSize = udp.parsePacket();
+  if (packetSize) {
+    Serial.print(F("udp received "));
+    Serial.print(packetSize);
+    Serial.print(F(" bytes from "));
+    udp.remoteIP().printTo(Serial);
+    Serial.print(F(" :"));
+    Serial.println(udp.remotePort());
+
+    char* buffer = (char*)malloc(packetSize + 1);
+    if (buffer) {
+      udp.read(buffer, packetSize);
+      buffer[packetSize] = 0;
+      Serial.println(F("Contents:"));
+      Serial.println(buffer);
+
+      // send a reply, to the IP address and port that sent us the packet we received
+      udp.beginPacket(udp.remoteIP(), udp.remotePort());
+      udp.write(buffer, packetSize);
+      udp.endPacket();
+      free(buffer);
+    } else {
+      Serial.println(F("udp: malloc failed"));
+      while (udp.read() >= 0);
+    }
+  }
+
   unsigned long now = millis();
   if (now > statusTimeMs) {
     statusTimeMs = now + STATUSDELAY_MS;