[e-mobility-charging-stations-simulator.git] / src / charging-station / ocpp / 1.6 / OCPP16IncomingRequestService.ts

// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.

import fs from 'fs';
import path from 'path';
import { URL, fileURLToPath } from 'url';

import type { JSONSchemaType } from 'ajv';
import { Client, type FTPResponse } from 'basic-ftp';
import tar from 'tar';

import OCPPError from '../../../exception/OCPPError';
import type { JsonObject, JsonType } from '../../../types/JsonType';
import { OCPP16ChargePointErrorCode } from '../../../types/ocpp/1.6/ChargePointErrorCode';
import { OCPP16ChargePointStatus } from '../../../types/ocpp/1.6/ChargePointStatus';
import {
  ChargingProfilePurposeType,
  type OCPP16ChargingProfile,
} from '../../../types/ocpp/1.6/ChargingProfile';
import {
  OCPP16StandardParametersKey,
  OCPP16SupportedFeatureProfiles,
} from '../../../types/ocpp/1.6/Configuration';
import { OCPP16DiagnosticsStatus } from '../../../types/ocpp/1.6/DiagnosticsStatus';
import {
  type ChangeAvailabilityRequest,
  type ChangeConfigurationRequest,
  type ClearChargingProfileRequest,
  type DiagnosticsStatusNotificationRequest,
  type GetConfigurationRequest,
  type GetDiagnosticsRequest,
  OCPP16AvailabilityType,
  type OCPP16BootNotificationRequest,
  type OCPP16ClearCacheRequest,
  type OCPP16DataTransferRequest,
  OCPP16DataTransferVendorId,
  type OCPP16HeartbeatRequest,
  OCPP16IncomingRequestCommand,
  OCPP16MessageTrigger,
  OCPP16RequestCommand,
  type OCPP16StatusNotificationRequest,
  type OCPP16TriggerMessageRequest,
  type OCPP16UpdateFirmwareRequest,
  type RemoteStartTransactionRequest,
  type RemoteStopTransactionRequest,
  type ResetRequest,
  type SetChargingProfileRequest,
  type UnlockConnectorRequest,
} from '../../../types/ocpp/1.6/Requests';
import {
  type ChangeAvailabilityResponse,
  type ChangeConfigurationResponse,
  type ClearChargingProfileResponse,
  type DiagnosticsStatusNotificationResponse,
  type GetConfigurationResponse,
  type GetDiagnosticsResponse,
  type OCPP16BootNotificationResponse,
  type OCPP16DataTransferResponse,
  OCPP16DataTransferStatus,
  type OCPP16HeartbeatResponse,
  type OCPP16StatusNotificationResponse,
  type OCPP16TriggerMessageResponse,
  type OCPP16UpdateFirmwareResponse,
  type SetChargingProfileResponse,
  type UnlockConnectorResponse,
} from '../../../types/ocpp/1.6/Responses';
import {
  OCPP16AuthorizationStatus,
  type OCPP16AuthorizeRequest,
  type OCPP16AuthorizeResponse,
  type OCPP16StartTransactionRequest,
  type OCPP16StartTransactionResponse,
  OCPP16StopTransactionReason,
} from '../../../types/ocpp/1.6/Transaction';
import type { OCPPConfigurationKey } from '../../../types/ocpp/Configuration';
import { ErrorType } from '../../../types/ocpp/ErrorType';
import { OCPPVersion } from '../../../types/ocpp/OCPPVersion';
import type { IncomingRequestHandler } from '../../../types/ocpp/Requests';
import type { DefaultResponse } from '../../../types/ocpp/Responses';
import Constants from '../../../utils/Constants';
import logger from '../../../utils/Logger';
import Utils from '../../../utils/Utils';
import type ChargingStation from '../../ChargingStation';
import { ChargingStationConfigurationUtils } from '../../ChargingStationConfigurationUtils';
import { ChargingStationUtils } from '../../ChargingStationUtils';
import OCPPConstants from '../OCPPConstants';
import OCPPIncomingRequestService from '../OCPPIncomingRequestService';
import { OCPP16ServiceUtils } from './OCPP16ServiceUtils';

const moduleName = 'OCPP16IncomingRequestService';

export default class OCPP16IncomingRequestService extends OCPPIncomingRequestService {
  protected jsonSchemas: Map<OCPP16IncomingRequestCommand, JSONSchemaType<JsonObject>>;
  private incomingRequestHandlers: Map<OCPP16IncomingRequestCommand, IncomingRequestHandler>;

  public constructor() {
    if (new.target?.name === moduleName) {
      throw new TypeError(`Cannot construct ${new.target?.name} instances directly`);
    }
    super(OCPPVersion.VERSION_16);
    this.incomingRequestHandlers = new Map<OCPP16IncomingRequestCommand, IncomingRequestHandler>([
      [OCPP16IncomingRequestCommand.RESET, this.handleRequestReset.bind(this)],
      [OCPP16IncomingRequestCommand.CLEAR_CACHE, this.handleRequestClearCache.bind(this)],
      [OCPP16IncomingRequestCommand.UNLOCK_CONNECTOR, this.handleRequestUnlockConnector.bind(this)],
      [
        OCPP16IncomingRequestCommand.GET_CONFIGURATION,
        this.handleRequestGetConfiguration.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.CHANGE_CONFIGURATION,
        this.handleRequestChangeConfiguration.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.SET_CHARGING_PROFILE,
        this.handleRequestSetChargingProfile.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.CLEAR_CHARGING_PROFILE,
        this.handleRequestClearChargingProfile.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.CHANGE_AVAILABILITY,
        this.handleRequestChangeAvailability.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.REMOTE_START_TRANSACTION,
        this.handleRequestRemoteStartTransaction.bind(this),
      ],
      [
        OCPP16IncomingRequestCommand.REMOTE_STOP_TRANSACTION,
        this.handleRequestRemoteStopTransaction.bind(this),
      ],
      [OCPP16IncomingRequestCommand.GET_DIAGNOSTICS, this.handleRequestGetDiagnostics.bind(this)],
      [OCPP16IncomingRequestCommand.TRIGGER_MESSAGE, this.handleRequestTriggerMessage.bind(this)],
      [OCPP16IncomingRequestCommand.DATA_TRANSFER, this.handleRequestDataTransfer.bind(this)],
      // [OCPP16IncomingRequestCommand.UPDATE_FIRMWARE, this.handleRequestUpdateFirmware.bind(this)],
    ]);
    this.jsonSchemas = new Map<OCPP16IncomingRequestCommand, JSONSchemaType<JsonObject>>([
      [
        OCPP16IncomingRequestCommand.RESET,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/Reset.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<ResetRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.CLEAR_CACHE,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/ClearCache.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<OCPP16ClearCacheRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.UNLOCK_CONNECTOR,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/UnlockConnector.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<UnlockConnectorRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.GET_CONFIGURATION,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/GetConfiguration.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<GetConfigurationRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.CHANGE_CONFIGURATION,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/ChangeConfiguration.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<ChangeConfigurationRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.GET_DIAGNOSTICS,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/GetDiagnostics.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<GetDiagnosticsRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.SET_CHARGING_PROFILE,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/SetChargingProfile.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<SetChargingProfileRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.CLEAR_CHARGING_PROFILE,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/ClearChargingProfile.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<ClearChargingProfileRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.CHANGE_AVAILABILITY,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/ChangeAvailability.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<ChangeAvailabilityRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.REMOTE_START_TRANSACTION,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/RemoteStartTransaction.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<RemoteStartTransactionRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.REMOTE_STOP_TRANSACTION,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/RemoteStopTransaction.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<RemoteStopTransactionRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.TRIGGER_MESSAGE,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/TriggerMessage.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<OCPP16TriggerMessageRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.DATA_TRANSFER,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/DataTransfer.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<OCPP16DataTransferRequest>,
      ],
      [
        OCPP16IncomingRequestCommand.UPDATE_FIRMWARE,
        JSON.parse(
          fs.readFileSync(
            path.resolve(
              path.dirname(fileURLToPath(import.meta.url)),
              '../../../assets/json-schemas/ocpp/1.6/UpdateFirmware.json'
            ),
            'utf8'
          )
        ) as JSONSchemaType<OCPP16UpdateFirmwareRequest>,
      ],
    ]);
    this.validatePayload.bind(this);
  }

  public async incomingRequestHandler(
    chargingStation: ChargingStation,
    messageId: string,
    commandName: OCPP16IncomingRequestCommand,
    commandPayload: JsonType
  ): Promise<void> {
    let response: JsonType;
    if (
      chargingStation.getOcppStrictCompliance() === true &&
      chargingStation.isInPendingState() === true &&
      (commandName === OCPP16IncomingRequestCommand.REMOTE_START_TRANSACTION ||
        commandName === OCPP16IncomingRequestCommand.REMOTE_STOP_TRANSACTION)
    ) {
      throw new OCPPError(
        ErrorType.SECURITY_ERROR,
        `${commandName} cannot be issued to handle request PDU ${JSON.stringify(
          commandPayload,
          null,
          2
        )} while the charging station is in pending state on the central server`,
        commandName,
        commandPayload
      );
    }
    if (
      chargingStation.isRegistered() === true ||
      (chargingStation.getOcppStrictCompliance() === false &&
        chargingStation.isInUnknownState() === true)
    ) {
      if (
        this.incomingRequestHandlers.has(commandName) === true &&
        OCPP16ServiceUtils.isIncomingRequestCommandSupported(chargingStation, commandName) === true
      ) {
        try {
          this.validatePayload(chargingStation, commandName, commandPayload);
          // Call the method to build the response
          response = await this.incomingRequestHandlers.get(commandName)(
            chargingStation,
            commandPayload
          );
        } catch (error) {
          // Log
          logger.error(
            `${chargingStation.logPrefix()} ${moduleName}.incomingRequestHandler: Handle incoming request error:`,
            error
          );
          throw error;
        }
      } else {
        // Throw exception
        throw new OCPPError(
          ErrorType.NOT_IMPLEMENTED,
          `${commandName} is not implemented to handle request PDU ${JSON.stringify(
            commandPayload,
            null,
            2
          )}`,
          commandName,
          commandPayload
        );
      }
    } else {
      throw new OCPPError(
        ErrorType.SECURITY_ERROR,
        `${commandName} cannot be issued to handle request PDU ${JSON.stringify(
          commandPayload,
          null,
          2
        )} while the charging station is not registered on the central server.`,
        commandName,
        commandPayload
      );
    }
    // Send the built response
    await chargingStation.ocppRequestService.sendResponse(
      chargingStation,
      messageId,
      response,
      commandName
    );
  }

  private validatePayload(
    chargingStation: ChargingStation,
    commandName: OCPP16IncomingRequestCommand,
    commandPayload: JsonType
  ): boolean {
    if (this.jsonSchemas.has(commandName) === true) {
      return this.validateIncomingRequestPayload(
        chargingStation,
        commandName,
        this.jsonSchemas.get(commandName),
        commandPayload
      );
    }
    logger.warn(
      `${chargingStation.logPrefix()} ${moduleName}.validatePayload: No JSON schema found for command '${commandName}' PDU validation`
    );
    return false;
  }

  // Simulate charging station restart
  private handleRequestReset(
    chargingStation: ChargingStation,
    commandPayload: ResetRequest
  ): DefaultResponse {
    this.asyncResource
      .runInAsyncScope(
        chargingStation.reset.bind(chargingStation) as (
          this: ChargingStation,
          ...args: any[]
        ) => Promise<void>,
        chargingStation,
        (commandPayload.type + 'Reset') as OCPP16StopTransactionReason
      )
      .catch(() => {
        /* This is intentional */
      });
    logger.info(
      `${chargingStation.logPrefix()} ${
        commandPayload.type
      } reset command received, simulating it. The station will be back online in ${Utils.formatDurationMilliSeconds(
        chargingStation.stationInfo.resetTime
      )}`
    );
    return OCPPConstants.OCPP_RESPONSE_ACCEPTED;
  }

  private handleRequestClearCache(chargingStation: ChargingStation): DefaultResponse {
    chargingStation.authorizedTagsCache.deleteAuthorizedTags(
      ChargingStationUtils.getAuthorizationFile(chargingStation.stationInfo)
    );
    return OCPPConstants.OCPP_RESPONSE_ACCEPTED;
  }

  private async handleRequestUnlockConnector(
    chargingStation: ChargingStation,
    commandPayload: UnlockConnectorRequest
  ): Promise<UnlockConnectorResponse> {
    const connectorId = commandPayload.connectorId;
    if (chargingStation.connectors.has(connectorId) === false) {
      logger.error(
        `${chargingStation.logPrefix()} Trying to unlock a non existing connector Id ${connectorId.toString()}`
      );
      return OCPPConstants.OCPP_RESPONSE_UNLOCK_NOT_SUPPORTED;
    }
    if (connectorId === 0) {
      logger.error(
        chargingStation.logPrefix() + ' Trying to unlock connector Id ' + connectorId.toString()
      );
      return OCPPConstants.OCPP_RESPONSE_UNLOCK_NOT_SUPPORTED;
    }
    if (chargingStation.getConnectorStatus(connectorId)?.transactionStarted === true) {
      const stopResponse = await chargingStation.stopTransactionOnConnector(
        connectorId,
        OCPP16StopTransactionReason.UNLOCK_COMMAND
      );
      if (stopResponse.idTagInfo?.status === OCPP16AuthorizationStatus.ACCEPTED) {
        return OCPPConstants.OCPP_RESPONSE_UNLOCKED;
      }
      return OCPPConstants.OCPP_RESPONSE_UNLOCK_FAILED;
    }
    await chargingStation.ocppRequestService.requestHandler<
      OCPP16StatusNotificationRequest,
      OCPP16StatusNotificationResponse
    >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
      connectorId,
      status: OCPP16ChargePointStatus.AVAILABLE,
      errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
    });
    chargingStation.getConnectorStatus(connectorId).status = OCPP16ChargePointStatus.AVAILABLE;
    return OCPPConstants.OCPP_RESPONSE_UNLOCKED;
  }

  private handleRequestGetConfiguration(
    chargingStation: ChargingStation,
    commandPayload: GetConfigurationRequest
  ): GetConfigurationResponse {
    const configurationKey: OCPPConfigurationKey[] = [];
    const unknownKey: string[] = [];
    if (Utils.isEmptyArray(commandPayload.key) === true) {
      for (const configuration of chargingStation.ocppConfiguration.configurationKey) {
        if (Utils.isUndefined(configuration.visible) === true) {
          configuration.visible = true;
        }
        if (configuration.visible === false) {
          continue;
        }
        configurationKey.push({
          key: configuration.key,
          readonly: configuration.readonly,
          value: configuration.value,
        });
      }
    } else {
      for (const key of commandPayload.key) {
        const keyFound = ChargingStationConfigurationUtils.getConfigurationKey(
          chargingStation,
          key
        );
        if (keyFound) {
          if (Utils.isUndefined(keyFound.visible) === true) {
            keyFound.visible = true;
          }
          if (keyFound.visible === false) {
            continue;
          }
          configurationKey.push({
            key: keyFound.key,
            readonly: keyFound.readonly,
            value: keyFound.value,
          });
        } else {
          unknownKey.push(key);
        }
      }
    }
    return {
      configurationKey,
      unknownKey,
    };
  }

  private handleRequestChangeConfiguration(
    chargingStation: ChargingStation,
    commandPayload: ChangeConfigurationRequest
  ): ChangeConfigurationResponse {
    const keyToChange = ChargingStationConfigurationUtils.getConfigurationKey(
      chargingStation,
      commandPayload.key,
      true
    );
    if (!keyToChange) {
      return OCPPConstants.OCPP_CONFIGURATION_RESPONSE_NOT_SUPPORTED;
    } else if (keyToChange && keyToChange.readonly) {
      return OCPPConstants.OCPP_CONFIGURATION_RESPONSE_REJECTED;
    } else if (keyToChange && !keyToChange.readonly) {
      let valueChanged = false;
      if (keyToChange.value !== commandPayload.value) {
        ChargingStationConfigurationUtils.setConfigurationKeyValue(
          chargingStation,
          commandPayload.key,
          commandPayload.value,
          true
        );
        valueChanged = true;
      }
      let triggerHeartbeatRestart = false;
      if (keyToChange.key === OCPP16StandardParametersKey.HeartBeatInterval && valueChanged) {
        ChargingStationConfigurationUtils.setConfigurationKeyValue(
          chargingStation,
          OCPP16StandardParametersKey.HeartbeatInterval,
          commandPayload.value
        );
        triggerHeartbeatRestart = true;
      }
      if (keyToChange.key === OCPP16StandardParametersKey.HeartbeatInterval && valueChanged) {
        ChargingStationConfigurationUtils.setConfigurationKeyValue(
          chargingStation,
          OCPP16StandardParametersKey.HeartBeatInterval,
          commandPayload.value
        );
        triggerHeartbeatRestart = true;
      }
      if (triggerHeartbeatRestart) {
        chargingStation.restartHeartbeat();
      }
      if (keyToChange.key === OCPP16StandardParametersKey.WebSocketPingInterval && valueChanged) {
        chargingStation.restartWebSocketPing();
      }
      if (keyToChange.reboot) {
        return OCPPConstants.OCPP_CONFIGURATION_RESPONSE_REBOOT_REQUIRED;
      }
      return OCPPConstants.OCPP_CONFIGURATION_RESPONSE_ACCEPTED;
    }
  }

  private handleRequestSetChargingProfile(
    chargingStation: ChargingStation,
    commandPayload: SetChargingProfileRequest
  ): SetChargingProfileResponse {
    if (
      OCPP16ServiceUtils.checkFeatureProfile(
        chargingStation,
        OCPP16SupportedFeatureProfiles.SmartCharging,
        OCPP16IncomingRequestCommand.SET_CHARGING_PROFILE
      ) === false
    ) {
      return OCPPConstants.OCPP_SET_CHARGING_PROFILE_RESPONSE_NOT_SUPPORTED;
    }
    if (chargingStation.connectors.has(commandPayload.connectorId) === false) {
      logger.error(
        `${chargingStation.logPrefix()} Trying to set charging profile(s) to a non existing connector Id ${
          commandPayload.connectorId
        }`
      );
      return OCPPConstants.OCPP_SET_CHARGING_PROFILE_RESPONSE_REJECTED;
    }
    if (
      commandPayload.csChargingProfiles.chargingProfilePurpose ===
        ChargingProfilePurposeType.CHARGE_POINT_MAX_PROFILE &&
      commandPayload.connectorId !== 0
    ) {
      return OCPPConstants.OCPP_SET_CHARGING_PROFILE_RESPONSE_REJECTED;
    }
    if (
      commandPayload.csChargingProfiles.chargingProfilePurpose ===
        ChargingProfilePurposeType.TX_PROFILE &&
      (commandPayload.connectorId === 0 ||
        chargingStation.getConnectorStatus(commandPayload.connectorId)?.transactionStarted ===
          false)
    ) {
      logger.error(
        `${chargingStation.logPrefix()} Trying to set transaction charging profile(s) on connector ${
          commandPayload.connectorId
        } without a started transaction`
      );
      return OCPPConstants.OCPP_SET_CHARGING_PROFILE_RESPONSE_REJECTED;
    }
    OCPP16ServiceUtils.setChargingProfile(
      chargingStation,
      commandPayload.connectorId,
      commandPayload.csChargingProfiles
    );
    logger.debug(
      `${chargingStation.logPrefix()} Charging profile(s) set on connector id ${
        commandPayload.connectorId
      }, dump their stack: %j`,
      chargingStation.getConnectorStatus(commandPayload.connectorId).chargingProfiles
    );
    return OCPPConstants.OCPP_SET_CHARGING_PROFILE_RESPONSE_ACCEPTED;
  }

  private handleRequestClearChargingProfile(
    chargingStation: ChargingStation,
    commandPayload: ClearChargingProfileRequest
  ): ClearChargingProfileResponse {
    if (
      OCPP16ServiceUtils.checkFeatureProfile(
        chargingStation,
        OCPP16SupportedFeatureProfiles.SmartCharging,
        OCPP16IncomingRequestCommand.CLEAR_CHARGING_PROFILE
      ) === false
    ) {
      return OCPPConstants.OCPP_CLEAR_CHARGING_PROFILE_RESPONSE_UNKNOWN;
    }
    if (chargingStation.connectors.has(commandPayload.connectorId) === false) {
      logger.error(
        `${chargingStation.logPrefix()} Trying to clear a charging profile(s) to a non existing connector Id ${
          commandPayload.connectorId
        }`
      );
      return OCPPConstants.OCPP_CLEAR_CHARGING_PROFILE_RESPONSE_UNKNOWN;
    }
    const connectorStatus = chargingStation.getConnectorStatus(commandPayload.connectorId);
    if (commandPayload.connectorId && !Utils.isEmptyArray(connectorStatus.chargingProfiles)) {
      connectorStatus.chargingProfiles = [];
      logger.debug(
        `${chargingStation.logPrefix()} Charging profile(s) cleared on connector id ${
          commandPayload.connectorId
        }, dump their stack: %j`,
        connectorStatus.chargingProfiles
      );
      return OCPPConstants.OCPP_CLEAR_CHARGING_PROFILE_RESPONSE_ACCEPTED;
    }
    if (!commandPayload.connectorId) {
      let clearedCP = false;
      for (const connectorId of chargingStation.connectors.keys()) {
        if (!Utils.isEmptyArray(chargingStation.getConnectorStatus(connectorId).chargingProfiles)) {
          chargingStation
            .getConnectorStatus(connectorId)
            .chargingProfiles?.forEach((chargingProfile: OCPP16ChargingProfile, index: number) => {
              let clearCurrentCP = false;
              if (chargingProfile.chargingProfileId === commandPayload.id) {
                clearCurrentCP = true;
              }
              if (
                !commandPayload.chargingProfilePurpose &&
                chargingProfile.stackLevel === commandPayload.stackLevel
              ) {
                clearCurrentCP = true;
              }
              if (
                !chargingProfile.stackLevel &&
                chargingProfile.chargingProfilePurpose === commandPayload.chargingProfilePurpose
              ) {
                clearCurrentCP = true;
              }
              if (
                chargingProfile.stackLevel === commandPayload.stackLevel &&
                chargingProfile.chargingProfilePurpose === commandPayload.chargingProfilePurpose
              ) {
                clearCurrentCP = true;
              }
              if (clearCurrentCP) {
                connectorStatus.chargingProfiles.splice(index, 1);
                logger.debug(
                  `${chargingStation.logPrefix()} Matching charging profile(s) cleared on connector id ${
                    commandPayload.connectorId
                  }, dump their stack: %j`,
                  connectorStatus.chargingProfiles
                );
                clearedCP = true;
              }
            });
        }
      }
      if (clearedCP) {
        return OCPPConstants.OCPP_CLEAR_CHARGING_PROFILE_RESPONSE_ACCEPTED;
      }
    }
    return OCPPConstants.OCPP_CLEAR_CHARGING_PROFILE_RESPONSE_UNKNOWN;
  }

  private async handleRequestChangeAvailability(
    chargingStation: ChargingStation,
    commandPayload: ChangeAvailabilityRequest
  ): Promise<ChangeAvailabilityResponse> {
    const connectorId: number = commandPayload.connectorId;
    if (chargingStation.connectors.has(connectorId) === false) {
      logger.error(
        `${chargingStation.logPrefix()} Trying to change the availability of a non existing connector Id ${connectorId.toString()}`
      );
      return OCPPConstants.OCPP_AVAILABILITY_RESPONSE_REJECTED;
    }
    const chargePointStatus: OCPP16ChargePointStatus =
      commandPayload.type === OCPP16AvailabilityType.OPERATIVE
        ? OCPP16ChargePointStatus.AVAILABLE
        : OCPP16ChargePointStatus.UNAVAILABLE;
    if (connectorId === 0) {
      let response: ChangeAvailabilityResponse = OCPPConstants.OCPP_AVAILABILITY_RESPONSE_ACCEPTED;
      for (const id of chargingStation.connectors.keys()) {
        if (chargingStation.getConnectorStatus(id)?.transactionStarted === true) {
          response = OCPPConstants.OCPP_AVAILABILITY_RESPONSE_SCHEDULED;
        }
        chargingStation.getConnectorStatus(id).availability = commandPayload.type;
        if (response === OCPPConstants.OCPP_AVAILABILITY_RESPONSE_ACCEPTED) {
          await chargingStation.ocppRequestService.requestHandler<
            OCPP16StatusNotificationRequest,
            OCPP16StatusNotificationResponse
          >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
            connectorId: id,
            status: chargePointStatus,
            errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
          });
          chargingStation.getConnectorStatus(id).status = chargePointStatus;
        }
      }
      return response;
    } else if (
      connectorId > 0 &&
      (chargingStation.isChargingStationAvailable() === true ||
        (chargingStation.isChargingStationAvailable() === false &&
          commandPayload.type === OCPP16AvailabilityType.INOPERATIVE))
    ) {
      if (chargingStation.getConnectorStatus(connectorId)?.transactionStarted === true) {
        chargingStation.getConnectorStatus(connectorId).availability = commandPayload.type;
        return OCPPConstants.OCPP_AVAILABILITY_RESPONSE_SCHEDULED;
      }
      chargingStation.getConnectorStatus(connectorId).availability = commandPayload.type;
      await chargingStation.ocppRequestService.requestHandler<
        OCPP16StatusNotificationRequest,
        OCPP16StatusNotificationResponse
      >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
        connectorId,
        status: chargePointStatus,
        errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
      });
      chargingStation.getConnectorStatus(connectorId).status = chargePointStatus;
      return OCPPConstants.OCPP_AVAILABILITY_RESPONSE_ACCEPTED;
    }
    return OCPPConstants.OCPP_AVAILABILITY_RESPONSE_REJECTED;
  }

  private async handleRequestRemoteStartTransaction(
    chargingStation: ChargingStation,
    commandPayload: RemoteStartTransactionRequest
  ): Promise<DefaultResponse> {
    const transactionConnectorId = commandPayload.connectorId;
    if (chargingStation.connectors.has(transactionConnectorId) === true) {
      const remoteStartTransactionLogMsg =
        chargingStation.logPrefix() +
        ' Transaction remotely STARTED on ' +
        chargingStation.stationInfo.chargingStationId +
        '#' +
        transactionConnectorId.toString() +
        " for idTag '" +
        commandPayload.idTag +
        "'";
      await chargingStation.ocppRequestService.requestHandler<
        OCPP16StatusNotificationRequest,
        OCPP16StatusNotificationResponse
      >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
        connectorId: transactionConnectorId,
        status: OCPP16ChargePointStatus.PREPARING,
        errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
      });
      const connectorStatus = chargingStation.getConnectorStatus(transactionConnectorId);
      connectorStatus.status = OCPP16ChargePointStatus.PREPARING;
      if (chargingStation.isChargingStationAvailable() === true) {
        // Check if authorized
        if (chargingStation.getAuthorizeRemoteTxRequests() === true) {
          let authorized = false;
          if (
            chargingStation.getLocalAuthListEnabled() === true &&
            chargingStation.hasAuthorizedTags() === true &&
            chargingStation.authorizedTagsCache
              .getAuthorizedTags(
                ChargingStationUtils.getAuthorizationFile(chargingStation.stationInfo)
              )
              .find((idTag) => idTag === commandPayload.idTag)
          ) {
            connectorStatus.localAuthorizeIdTag = commandPayload.idTag;
            connectorStatus.idTagLocalAuthorized = true;
            authorized = true;
          } else if (chargingStation.getMustAuthorizeAtRemoteStart() === true) {
            connectorStatus.authorizeIdTag = commandPayload.idTag;
            const authorizeResponse: OCPP16AuthorizeResponse =
              await chargingStation.ocppRequestService.requestHandler<
                OCPP16AuthorizeRequest,
                OCPP16AuthorizeResponse
              >(chargingStation, OCPP16RequestCommand.AUTHORIZE, {
                idTag: commandPayload.idTag,
              });
            if (authorizeResponse?.idTagInfo?.status === OCPP16AuthorizationStatus.ACCEPTED) {
              authorized = true;
            }
          } else {
            logger.warn(
              `${chargingStation.logPrefix()} The charging station configuration expects authorize at remote start transaction but local authorization or authorize isn't enabled`
            );
          }
          if (authorized === true) {
            // Authorization successful, start transaction
            if (
              this.setRemoteStartTransactionChargingProfile(
                chargingStation,
                transactionConnectorId,
                commandPayload.chargingProfile
              ) === true
            ) {
              connectorStatus.transactionRemoteStarted = true;
              if (
                (
                  await chargingStation.ocppRequestService.requestHandler<
                    OCPP16StartTransactionRequest,
                    OCPP16StartTransactionResponse
                  >(chargingStation, OCPP16RequestCommand.START_TRANSACTION, {
                    connectorId: transactionConnectorId,
                    idTag: commandPayload.idTag,
                  })
                ).idTagInfo.status === OCPP16AuthorizationStatus.ACCEPTED
              ) {
                logger.debug(remoteStartTransactionLogMsg);
                return OCPPConstants.OCPP_RESPONSE_ACCEPTED;
              }
              return this.notifyRemoteStartTransactionRejected(
                chargingStation,
                transactionConnectorId,
                commandPayload.idTag
              );
            }
            return this.notifyRemoteStartTransactionRejected(
              chargingStation,
              transactionConnectorId,
              commandPayload.idTag
            );
          }
          return this.notifyRemoteStartTransactionRejected(
            chargingStation,
            transactionConnectorId,
            commandPayload.idTag
          );
        }
        // No authorization check required, start transaction
        if (
          this.setRemoteStartTransactionChargingProfile(
            chargingStation,
            transactionConnectorId,
            commandPayload.chargingProfile
          ) === true
        ) {
          connectorStatus.transactionRemoteStarted = true;
          if (
            (
              await chargingStation.ocppRequestService.requestHandler<
                OCPP16StartTransactionRequest,
                OCPP16StartTransactionResponse
              >(chargingStation, OCPP16RequestCommand.START_TRANSACTION, {
                connectorId: transactionConnectorId,
                idTag: commandPayload.idTag,
              })
            ).idTagInfo.status === OCPP16AuthorizationStatus.ACCEPTED
          ) {
            logger.debug(remoteStartTransactionLogMsg);
            return OCPPConstants.OCPP_RESPONSE_ACCEPTED;
          }
          return this.notifyRemoteStartTransactionRejected(
            chargingStation,
            transactionConnectorId,
            commandPayload.idTag
          );
        }
        return this.notifyRemoteStartTransactionRejected(
          chargingStation,
          transactionConnectorId,
          commandPayload.idTag
        );
      }
      return this.notifyRemoteStartTransactionRejected(
        chargingStation,
        transactionConnectorId,
        commandPayload.idTag
      );
    }
    return this.notifyRemoteStartTransactionRejected(
      chargingStation,
      transactionConnectorId,
      commandPayload.idTag
    );
  }

  private async notifyRemoteStartTransactionRejected(
    chargingStation: ChargingStation,
    connectorId: number,
    idTag: string
  ): Promise<DefaultResponse> {
    if (
      chargingStation.getConnectorStatus(connectorId).status !== OCPP16ChargePointStatus.AVAILABLE
    ) {
      await chargingStation.ocppRequestService.requestHandler<
        OCPP16StatusNotificationRequest,
        OCPP16StatusNotificationResponse
      >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
        connectorId,
        status: OCPP16ChargePointStatus.AVAILABLE,
        errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
      });
      chargingStation.getConnectorStatus(connectorId).status = OCPP16ChargePointStatus.AVAILABLE;
    }
    logger.warn(
      chargingStation.logPrefix() +
        ' Remote starting transaction REJECTED on connector Id ' +
        connectorId.toString() +
        ", idTag '" +
        idTag +
        "', availability '" +
        chargingStation.getConnectorStatus(connectorId).availability +
        "', status '" +
        chargingStation.getConnectorStatus(connectorId).status +
        "'"
    );
    return OCPPConstants.OCPP_RESPONSE_REJECTED;
  }

  private setRemoteStartTransactionChargingProfile(
    chargingStation: ChargingStation,
    connectorId: number,
    cp: OCPP16ChargingProfile
  ): boolean {
    if (cp && cp.chargingProfilePurpose === ChargingProfilePurposeType.TX_PROFILE) {
      OCPP16ServiceUtils.setChargingProfile(chargingStation, connectorId, cp);
      logger.debug(
        `${chargingStation.logPrefix()} Charging profile(s) set at remote start transaction on connector id ${connectorId}, dump their stack: %j`,
        chargingStation.getConnectorStatus(connectorId).chargingProfiles
      );
      return true;
    } else if (cp && cp.chargingProfilePurpose !== ChargingProfilePurposeType.TX_PROFILE) {
      logger.warn(
        `${chargingStation.logPrefix()} Not allowed to set ${
          cp.chargingProfilePurpose
        } charging profile(s) at remote start transaction`
      );
      return false;
    } else if (!cp) {
      return true;
    }
  }

  private async handleRequestRemoteStopTransaction(
    chargingStation: ChargingStation,
    commandPayload: RemoteStopTransactionRequest
  ): Promise<DefaultResponse> {
    const transactionId = commandPayload.transactionId;
    for (const connectorId of chargingStation.connectors.keys()) {
      if (
        connectorId > 0 &&
        chargingStation.getConnectorStatus(connectorId)?.transactionId === transactionId
      ) {
        await chargingStation.ocppRequestService.requestHandler<
          OCPP16StatusNotificationRequest,
          OCPP16StatusNotificationResponse
        >(chargingStation, OCPP16RequestCommand.STATUS_NOTIFICATION, {
          connectorId,
          status: OCPP16ChargePointStatus.FINISHING,
          errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
        });
        chargingStation.getConnectorStatus(connectorId).status = OCPP16ChargePointStatus.FINISHING;
        const stopResponse = await chargingStation.stopTransactionOnConnector(
          connectorId,
          OCPP16StopTransactionReason.REMOTE
        );
        if (stopResponse.idTagInfo?.status === OCPP16AuthorizationStatus.ACCEPTED) {
          return OCPPConstants.OCPP_RESPONSE_ACCEPTED;
        }
        return OCPPConstants.OCPP_RESPONSE_REJECTED;
      }
    }
    logger.warn(
      chargingStation.logPrefix() +
        ' Trying to remote stop a non existing transaction ' +
        transactionId.toString()
    );
    return OCPPConstants.OCPP_RESPONSE_REJECTED;
  }

  private handleRequestUpdateFirmware(
    chargingStation: ChargingStation,
    commandPayload: OCPP16UpdateFirmwareRequest
  ): OCPP16UpdateFirmwareResponse {
    if (
      OCPP16ServiceUtils.checkFeatureProfile(
        chargingStation,
        OCPP16SupportedFeatureProfiles.FirmwareManagement,
        OCPP16IncomingRequestCommand.UPDATE_FIRMWARE
      ) === false
    ) {
      return OCPPConstants.OCPP_RESPONSE_EMPTY;
    }
    logger.debug(
      chargingStation.logPrefix() +
        ' ' +
        OCPP16IncomingRequestCommand.UPDATE_FIRMWARE +
        ' request received: %j',
      commandPayload
    );
  }

  private async handleRequestGetDiagnostics(
    chargingStation: ChargingStation,
    commandPayload: GetDiagnosticsRequest
  ): Promise<GetDiagnosticsResponse> {
    if (
      OCPP16ServiceUtils.checkFeatureProfile(
        chargingStation,
        OCPP16SupportedFeatureProfiles.FirmwareManagement,
        OCPP16IncomingRequestCommand.GET_DIAGNOSTICS
      ) === false
    ) {
      return OCPPConstants.OCPP_RESPONSE_EMPTY;
    }
    logger.debug(
      chargingStation.logPrefix() +
        ' ' +
        OCPP16IncomingRequestCommand.GET_DIAGNOSTICS +
        ' request received: %j',
      commandPayload
    );
    const uri = new URL(commandPayload.location);
    if (uri.protocol.startsWith('ftp:')) {
      let ftpClient: Client;
      try {
        const logFiles = fs
          .readdirSync(path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../../../../'))
          .filter((file) => file.endsWith('.log'))
          .map((file) => path.join('./', file));
        const diagnosticsArchive = chargingStation.stationInfo.chargingStationId + '_logs.tar.gz';
        tar.create({ gzip: true }, logFiles).pipe(fs.createWriteStream(diagnosticsArchive));
        ftpClient = new Client();
        const accessResponse = await ftpClient.access({
          host: uri.host,
          ...(!Utils.isEmptyString(uri.port) && { port: Utils.convertToInt(uri.port) }),
          ...(!Utils.isEmptyString(uri.username) && { user: uri.username }),
          ...(!Utils.isEmptyString(uri.password) && { password: uri.password }),
        });
        let uploadResponse: FTPResponse;
        if (accessResponse.code === 220) {
          // eslint-disable-next-line @typescript-eslint/no-misused-promises
          ftpClient.trackProgress(async (info) => {
            logger.info(
              `${chargingStation.logPrefix()} ${
                info.bytes / 1024
              } bytes transferred from diagnostics archive ${info.name}`
            );
            await chargingStation.ocppRequestService.requestHandler<
              DiagnosticsStatusNotificationRequest,
              DiagnosticsStatusNotificationResponse
            >(chargingStation, OCPP16RequestCommand.DIAGNOSTICS_STATUS_NOTIFICATION, {
              status: OCPP16DiagnosticsStatus.Uploading,
            });
          });
          uploadResponse = await ftpClient.uploadFrom(
            path.join(
              path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../../../../'),
              diagnosticsArchive
            ),
            uri.pathname + diagnosticsArchive
          );
          if (uploadResponse.code === 226) {
            await chargingStation.ocppRequestService.requestHandler<
              DiagnosticsStatusNotificationRequest,
              DiagnosticsStatusNotificationResponse
            >(chargingStation, OCPP16RequestCommand.DIAGNOSTICS_STATUS_NOTIFICATION, {
              status: OCPP16DiagnosticsStatus.Uploaded,
            });
            if (ftpClient) {
              ftpClient.close();
            }
            return { fileName: diagnosticsArchive };
          }
          throw new OCPPError(
            ErrorType.GENERIC_ERROR,
            `Diagnostics transfer failed with error code ${accessResponse.code.toString()}${
              uploadResponse?.code && '|' + uploadResponse?.code.toString()
            }`,
            OCPP16IncomingRequestCommand.GET_DIAGNOSTICS
          );
        }
        throw new OCPPError(
          ErrorType.GENERIC_ERROR,
          `Diagnostics transfer failed with error code ${accessResponse.code.toString()}${
            uploadResponse?.code && '|' + uploadResponse?.code.toString()
          }`,
          OCPP16IncomingRequestCommand.GET_DIAGNOSTICS
        );
      } catch (error) {
        await chargingStation.ocppRequestService.requestHandler<
          DiagnosticsStatusNotificationRequest,
          DiagnosticsStatusNotificationResponse
        >(chargingStation, OCPP16RequestCommand.DIAGNOSTICS_STATUS_NOTIFICATION, {
          status: OCPP16DiagnosticsStatus.UploadFailed,
        });
        if (ftpClient) {
          ftpClient.close();
        }
        return this.handleIncomingRequestError(
          chargingStation,
          OCPP16IncomingRequestCommand.GET_DIAGNOSTICS,
          error as Error,
          { errorResponse: OCPPConstants.OCPP_RESPONSE_EMPTY }
        );
      }
    } else {
      logger.error(
        `${chargingStation.logPrefix()} Unsupported protocol ${
          uri.protocol
        } to transfer the diagnostic logs archive`
      );
      await chargingStation.ocppRequestService.requestHandler<
        DiagnosticsStatusNotificationRequest,
        DiagnosticsStatusNotificationResponse
      >(chargingStation, OCPP16RequestCommand.DIAGNOSTICS_STATUS_NOTIFICATION, {
        status: OCPP16DiagnosticsStatus.UploadFailed,
      });
      return OCPPConstants.OCPP_RESPONSE_EMPTY;
    }
  }

  private handleRequestTriggerMessage(
    chargingStation: ChargingStation,
    commandPayload: OCPP16TriggerMessageRequest
  ): OCPP16TriggerMessageResponse {
    if (
      !OCPP16ServiceUtils.checkFeatureProfile(
        chargingStation,
        OCPP16SupportedFeatureProfiles.RemoteTrigger,
        OCPP16IncomingRequestCommand.TRIGGER_MESSAGE
      ) ||
      !OCPP16ServiceUtils.isMessageTriggerSupported(
        chargingStation,
        commandPayload.requestedMessage
      )
    ) {
      return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_NOT_IMPLEMENTED;
    }
    if (
      !OCPP16ServiceUtils.isConnectorIdValid(
        chargingStation,
        OCPP16IncomingRequestCommand.TRIGGER_MESSAGE,
        commandPayload.connectorId
      )
    ) {
      return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_REJECTED;
    }
    try {
      switch (commandPayload.requestedMessage) {
        case OCPP16MessageTrigger.BootNotification:
          setTimeout(() => {
            chargingStation.ocppRequestService
              .requestHandler<OCPP16BootNotificationRequest, OCPP16BootNotificationResponse>(
                chargingStation,
                OCPP16RequestCommand.BOOT_NOTIFICATION,
                chargingStation.bootNotificationRequest,
                { skipBufferingOnError: true, triggerMessage: true }
              )
              .then((response) => {
                chargingStation.bootNotificationResponse = response;
              })
              .catch(() => {
                /* This is intentional */
              });
          }, Constants.OCPP_TRIGGER_MESSAGE_DELAY);
          return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_ACCEPTED;
        case OCPP16MessageTrigger.Heartbeat:
          setTimeout(() => {
            chargingStation.ocppRequestService
              .requestHandler<OCPP16HeartbeatRequest, OCPP16HeartbeatResponse>(
                chargingStation,
                OCPP16RequestCommand.HEARTBEAT,
                null,
                {
                  triggerMessage: true,
                }
              )
              .catch(() => {
                /* This is intentional */
              });
          }, Constants.OCPP_TRIGGER_MESSAGE_DELAY);
          return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_ACCEPTED;
        case OCPP16MessageTrigger.StatusNotification:
          setTimeout(() => {
            if (commandPayload?.connectorId) {
              chargingStation.ocppRequestService
                .requestHandler<OCPP16StatusNotificationRequest, OCPP16StatusNotificationResponse>(
                  chargingStation,
                  OCPP16RequestCommand.STATUS_NOTIFICATION,
                  {
                    connectorId: commandPayload.connectorId,
                    errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
                    status: chargingStation.getConnectorStatus(commandPayload.connectorId).status,
                  },
                  {
                    triggerMessage: true,
                  }
                )
                .catch(() => {
                  /* This is intentional */
                });
            } else {
              for (const connectorId of chargingStation.connectors.keys()) {
                chargingStation.ocppRequestService
                  .requestHandler<
                    OCPP16StatusNotificationRequest,
                    OCPP16StatusNotificationResponse
                  >(
                    chargingStation,
                    OCPP16RequestCommand.STATUS_NOTIFICATION,
                    {
                      connectorId,
                      errorCode: OCPP16ChargePointErrorCode.NO_ERROR,
                      status: chargingStation.getConnectorStatus(connectorId).status,
                    },
                    {
                      triggerMessage: true,
                    }
                  )
                  .catch(() => {
                    /* This is intentional */
                  });
              }
            }
          }, Constants.OCPP_TRIGGER_MESSAGE_DELAY);
          return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_ACCEPTED;
        default:
          return OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_NOT_IMPLEMENTED;
      }
    } catch (error) {
      return this.handleIncomingRequestError(
        chargingStation,
        OCPP16IncomingRequestCommand.TRIGGER_MESSAGE,
        error as Error,
        { errorResponse: OCPPConstants.OCPP_TRIGGER_MESSAGE_RESPONSE_REJECTED }
      );
    }
  }

  private handleRequestDataTransfer(
    chargingStation: ChargingStation,
    commandPayload: OCPP16DataTransferRequest
  ): OCPP16DataTransferResponse {
    try {
      if (Object.values(OCPP16DataTransferVendorId).includes(commandPayload.vendorId)) {
        return {
          status: OCPP16DataTransferStatus.ACCEPTED,
        };
      }
      return {
        status: OCPP16DataTransferStatus.UNKNOWN_VENDOR_ID,
      };
    } catch (error) {
      return this.handleIncomingRequestError(
        chargingStation,
        OCPP16IncomingRequestCommand.DATA_TRANSFER,
        error as Error,
        { errorResponse: OCPPConstants.OCPP_DATA_TRANSFER_RESPONSE_REJECTED }
      );
    }
  }
}