OTA.h

/**************************************************************
 * This is a DEMO. You can use it only for development and testing.
 *
 * If you would like to add these features to your product,
 * please contact Blynk for Business:
 *
 *                  http://www.blynk.io/
 *
 **************************************************************
 *
 * How to trigger an OTA update?
 *   1. In Arduino IDE menu: Sketch -> Export compiled Binary
 *   2. Open console, navigate to the sketch directory
 *   3.a Trigger update using HTTPS API on local server for specific hardware:
 *       curl -v -F file=@Template_ESP8266.ino.nodemcu.bin --insecure -u admin@blynk.cc:admin https://localhost:9443/admin/ota/start?token=123
 *   3.b Trigger update using HTTPS API on local server for all hardware:
 *       curl -v -F file=@Template_ESP8266.ino.nodemcu.bin --insecure -u admin@blynk.cc:admin https://localhost:9443/admin/ota/start
 *   3.c Trigger update using HTTPS API on local server for single user:
 *       curl -v -F file=@Template_ESP8266.ino.nodemcu.bin --insecure -u admin@blynk.cc:admin https://localhost:9443/admin/ota/start?user=pupkin@gmail.com
 *   3.d Trigger update using HTTPS API on local server for single user and specific project:
 *       curl -v -F file=@Template_ESP8266.ino.nodemcu.bin --insecure -u admin@blynk.cc:admin https://localhost:9443/admin/ota/start?user=pupkin@gmail.com&project=123
 * More about ESP8266 OTA updates:
 *  https://github.com/esp8266/Arduino/blob/master/doc/ota_updates/readme.md
 */

#include <ESP8266HTTPClient.h>
#include <ESP8266httpUpdate.h>

String overTheAirURL;

BLYNK_WRITE(InternalPinOTA) {
  overTheAirURL = param.asString();

  Blynk.logEvent("sys_ota_upgrade");

  delay(500);
  // Disconnect, not to interfere with OTA process
  Blynk.disconnect();

  // Start OTA
  BlynkState::set(MODE_OTA_UPGRADE);
}

void enterOTA() {
  BlynkState::set(MODE_OTA_UPGRADE);

  DEBUG_PRINT(String("Firmware update URL: ") + overTheAirURL);
  switch (ESPhttpUpdate.update(overTheAirURL, BOARD_FIRMWARE_VERSION)) {
  case HTTP_UPDATE_FAILED:
    DEBUG_PRINT(String("Firmware update failed (error ") + ESPhttpUpdate.getLastError() + "): " + ESPhttpUpdate.getLastErrorString());
    BlynkState::set(MODE_ERROR);
    break;
  case HTTP_UPDATE_NO_UPDATES:
    DEBUG_PRINT("No firmware updates available.");
    BlynkState::set(MODE_CONNECTING_CLOUD);
    break;
  case HTTP_UPDATE_OK:
    DEBUG_PRINT("Firmware update: OK.");
    delay(10);
    restartMCU();
    break;
  }
}