Taken from https://github.com/SenMorgan/CommandStation-EX/tree/senmorgan-ArduinoOTA and inserted into latest devel code.

without the extra code changes.

Author: mwinters-stuff

CommandStation-EX.ino

@@ -118,6 +118,11 @@ void setup()
   WifiInterface::setup(WIFI_SERIAL_LINK_SPEED, F(WIFI_SSID), F(WIFI_PASSWORD), F(WIFI_HOSTNAME), IP_PORT, WIFI_CHANNEL, WIFI_FORCE_AP);
 #else
   WifiESP::setup();
+
+  #if OTA_AUTO_INIT
+    Diag::OTA = true;
+  #endif // OTA_AUTO_INIT
+  
 #endif // ARDUINO_ARCH_ESP32
 #endif // WIFI_ON