void ota()

in arduino/plant_reference.ino [198:249]
52 lines of code
10 McCabe index (conditional complexity)

void ota() {
  switch (state) {
    case NO_OTA: {
      expresslinkExecuteCommand("AT+OTA?\n");
      if (startsWith(expresslinkResponse, "OK 0", 4)) {
        awaitingOTAResponse = false;
        otaInProgress = false;
      } else if (startsWith(expresslinkResponse, "OK 1", 4)) {
        awaitingOTAResponse = true;
        state = DOWNLOAD_OTA;
      }
      break;
    }
    case DOWNLOADING: {
        delay(timeout_ms);
        expresslinkExecuteCommand("AT+OTA?\n");
        if (startsWith(expresslinkResponse, "OK 4", 4)) {
          state = OTA_UPDATE;
        }
        break;
    }
    case DOWNLOAD_OTA: {
        Serial.printf("Would you like to download and flash the new ExpressLink firmware (y/n)?\n");
        Serial.setTimeout(10000);
        String userResponse = Serial.readStringUntil('\n');
        if (userResponse.equals("y\r")) {
          expresslinkExecuteCommand("AT+OTA ACCEPT\n");
          state = DOWNLOADING;
          otaInProgress = true;
          awaitingOTAResponse = false;
        } else if (userResponse.equals("n\r")) {
          expresslinkExecuteCommand("AT+OTA FLUSH\n");
          awaitingOTAResponse = false;
          state = NO_OTA;
        }
        break;
    }
    case OTA_UPDATE: {
      expresslinkExecuteCommand("AT+OTA APPLY\n");
      state = NO_OTA;
      otaInProgress = false;
      expresslink_serial.setTimeout(20000);
      String response = expresslink_serial.readStringUntil('\n');
      int responseLen = response.length() + 1;
      response.toCharArray(expresslinkResponse, responseLen);
      Serial.printf(expresslinkResponse);
      expresslinkExecuteCommand("AT+CONNECT\n");
      expresslinkSetParams();
      break;
    }
  }
}