void ota_setup() {
  ArduinoOTA.onStart([]() {
    String type;
    if (ArduinoOTA.getCommand() == U_FLASH)
      type = "sketch";
    else // U_SPIFFS
      type = "filesystem";

    // NOTE: if updating SPIFFS this would be the place to unmount SPIFFS using SPIFFS.end()
    Serial.println("OTA * Start updating " + type);
  });
  ArduinoOTA.onEnd([]() {
    Serial.println("\nOTA * End");
  });
  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
    Serial.printf("OTA * Progress: %u%%\r", (progress / (total / 100)));
  });
  ArduinoOTA.onError([](ota_error_t error) {
    Serial.printf("OTA * Error[%u]: ", error);
    if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
    else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
    else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
    else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
    else if (error == OTA_END_ERROR) Serial.println("End Failed");
  });
  char client_id[30];
  snprintf(client_id, 30, HOSTNAME, ESP.getChipId());
  LOG("OTA * Starting OTA with client_id "); LOGln(client_id);
  ArduinoOTA.setHostname(client_id);
  ArduinoOTA.begin();
}

void ota_loop() {
  ArduinoOTA.handle();
}