Over-the-Air (OTA) Firmware Updates

Reflashing a deployed ESP32 over Wi-Fi instead of walking back to it with a USB cable.

A device that's already deployed — bolted to a wall, buried in an enclosure — is inconvenient to reach with a USB cable every time firmware needs updating. OTA (over-the-air) updates push new firmware over Wi-Fi instead.

#include 
#include 

void setup() {
  WiFi.begin("your-network-name", "your-network-password");
  while (WiFi.status() != WL_CONNECTED) delay(300);

  ArduinoOTA.setHostname("esp32-project");
  ArduinoOTA.begin();
}

void loop() {
  ArduinoOTA.handle();
  // ... rest of your program ...
}

Once this is running, the Arduino IDE can show the board as a network port alongside the usual USB ports, and future uploads go over Wi-Fi instead of a cable.