Merge remote-tracking branch 'remotes/esp8266/master' into w5100

Author: Links2004

libraries/ArduinoOTA/ArduinoOTA.cpp

@@ -51,6 +51,13 @@ void ArduinoOTA::setup() {
 }
 
 void ArduinoOTA::handle() {
+    
+  if (!*_udp_ota) {
+    _udp_ota->begin(_port); 
+        if (_serial_debug) {
+            Serial.println("OTA restarted"); 
+        }
+  }
 
   if (!_udp_ota->parsePacket()) return;