[e-mobility-charging-stations-simulator.git] / src / charging-station / ChargingStation.ts

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

import crypto from 'crypto';
import fs from 'fs';
import path from 'path';
import { URL } from 'url';
import { parentPort } from 'worker_threads';

import WebSocket, { Data, RawData } from 'ws';

import BaseError from '../exception/BaseError';
import OCPPError from '../exception/OCPPError';
import PerformanceStatistics from '../performance/PerformanceStatistics';
import type { AutomaticTransactionGeneratorConfiguration } from '../types/AutomaticTransactionGenerator';
import type { ChargingStationConfiguration } from '../types/ChargingStationConfiguration';
import type { ChargingStationInfo } from '../types/ChargingStationInfo';
import type { ChargingStationOcppConfiguration } from '../types/ChargingStationOcppConfiguration';
import {
  type ChargingStationTemplate,
  CurrentType,
  PowerUnits,
  type WsOptions,
} from '../types/ChargingStationTemplate';
import { SupervisionUrlDistribution } from '../types/ConfigurationData';
import type { ConnectorStatus } from '../types/ConnectorStatus';
import { FileType } from '../types/FileType';
import type { JsonType } from '../types/JsonType';
import { ChargePointErrorCode } from '../types/ocpp/ChargePointErrorCode';
import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
import { ChargingProfile, ChargingRateUnitType } from '../types/ocpp/ChargingProfile';
import {
  ConnectorPhaseRotation,
  StandardParametersKey,
  SupportedFeatureProfiles,
  VendorDefaultParametersKey,
} from '../types/ocpp/Configuration';
import { ErrorType } from '../types/ocpp/ErrorType';
import { MessageType } from '../types/ocpp/MessageType';
import { MeterValue, MeterValueMeasurand } from '../types/ocpp/MeterValues';
import { OCPPVersion } from '../types/ocpp/OCPPVersion';
import {
  AvailabilityType,
  BootNotificationRequest,
  CachedRequest,
  HeartbeatRequest,
  IncomingRequest,
  IncomingRequestCommand,
  MeterValuesRequest,
  RequestCommand,
  StatusNotificationRequest,
} from '../types/ocpp/Requests';
import {
  BootNotificationResponse,
  ErrorResponse,
  HeartbeatResponse,
  MeterValuesResponse,
  RegistrationStatus,
  Response,
  StatusNotificationResponse,
} from '../types/ocpp/Responses';
import {
  StopTransactionReason,
  StopTransactionRequest,
  StopTransactionResponse,
} from '../types/ocpp/Transaction';
import { WSError, WebSocketCloseEventStatusCode } from '../types/WebSocket';
import Configuration from '../utils/Configuration';
import Constants from '../utils/Constants';
import { ACElectricUtils, DCElectricUtils } from '../utils/ElectricUtils';
import FileUtils from '../utils/FileUtils';
import logger from '../utils/Logger';
import Utils from '../utils/Utils';
import AuthorizedTagsCache from './AuthorizedTagsCache';
import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
import { ChargingStationConfigurationUtils } from './ChargingStationConfigurationUtils';
import { ChargingStationUtils } from './ChargingStationUtils';
import ChargingStationWorkerBroadcastChannel from './ChargingStationWorkerBroadcastChannel';
import { MessageChannelUtils } from './MessageChannelUtils';
import OCPP16IncomingRequestService from './ocpp/1.6/OCPP16IncomingRequestService';
import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
import { OCPP16ServiceUtils } from './ocpp/1.6/OCPP16ServiceUtils';
import type OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
import type OCPPRequestService from './ocpp/OCPPRequestService';
import SharedLRUCache from './SharedLRUCache';

export default class ChargingStation {
  public readonly index: number;
  public readonly templateFile: string;
  public stationInfo!: ChargingStationInfo;
  public started: boolean;
  public authorizedTagsCache: AuthorizedTagsCache;
  public automaticTransactionGenerator!: AutomaticTransactionGenerator;
  public ocppConfiguration!: ChargingStationOcppConfiguration;
  public wsConnection!: WebSocket;
  public readonly connectors: Map<number, ConnectorStatus>;
  public readonly requests: Map<string, CachedRequest>;
  public performanceStatistics!: PerformanceStatistics;
  public heartbeatSetInterval!: NodeJS.Timeout;
  public ocppRequestService!: OCPPRequestService;
  public bootNotificationRequest!: BootNotificationRequest;
  public bootNotificationResponse!: BootNotificationResponse | null;
  public powerDivider!: number;
  private starting: boolean;
  private stopping: boolean;
  private configurationFile!: string;
  private configurationFileHash!: string;
  private connectorsConfigurationHash!: string;
  private ocppIncomingRequestService!: OCPPIncomingRequestService;
  private readonly messageBuffer: Set<string>;
  private configuredSupervisionUrl!: URL;
  private configuredSupervisionUrlIndex!: number;
  private wsConnectionRestarted: boolean;
  private autoReconnectRetryCount: number;
  private templateFileWatcher!: fs.FSWatcher;
  private readonly sharedLRUCache: SharedLRUCache;
  private webSocketPingSetInterval!: NodeJS.Timeout;
  private readonly chargingStationWorkerBroadcastChannel: ChargingStationWorkerBroadcastChannel;

  constructor(index: number, templateFile: string) {
    this.started = false;
    this.starting = false;
    this.stopping = false;
    this.wsConnectionRestarted = false;
    this.autoReconnectRetryCount = 0;
    this.index = index;
    this.templateFile = templateFile;
    this.connectors = new Map<number, ConnectorStatus>();
    this.requests = new Map<string, CachedRequest>();
    this.messageBuffer = new Set<string>();
    this.sharedLRUCache = SharedLRUCache.getInstance();
    this.authorizedTagsCache = AuthorizedTagsCache.getInstance();
    this.chargingStationWorkerBroadcastChannel = new ChargingStationWorkerBroadcastChannel(this);

    this.initialize();
  }

  private get wsConnectionUrl(): URL {
    return new URL(
      (this.getSupervisionUrlOcppConfiguration()
        ? ChargingStationConfigurationUtils.getConfigurationKey(
            this,
            this.getSupervisionUrlOcppKey()
          ).value
        : this.configuredSupervisionUrl.href) +
        '/' +
        this.stationInfo.chargingStationId
    );
  }

  public logPrefix(): string {
    return Utils.logPrefix(
      ` ${
        this?.stationInfo?.chargingStationId ??
        ChargingStationUtils.getChargingStationId(this.index, this.getTemplateFromFile())
      } |`
    );
  }

  public hasAuthorizedTags(): boolean {
    return !Utils.isEmptyArray(
      this.authorizedTagsCache.getAuthorizedTags(
        ChargingStationUtils.getAuthorizationFile(this.stationInfo)
      )
    );
  }

  public getEnableStatistics(): boolean | undefined {
    return !Utils.isUndefined(this.stationInfo.enableStatistics)
      ? this.stationInfo.enableStatistics
      : true;
  }

  public getMustAuthorizeAtRemoteStart(): boolean | undefined {
    return this.stationInfo.mustAuthorizeAtRemoteStart ?? true;
  }

  public getPayloadSchemaValidation(): boolean | undefined {
    return this.stationInfo.payloadSchemaValidation ?? true;
  }

  public getNumberOfPhases(stationInfo?: ChargingStationInfo): number | undefined {
    const localStationInfo: ChargingStationInfo = stationInfo ?? this.stationInfo;
    switch (this.getCurrentOutType(stationInfo)) {
      case CurrentType.AC:
        return !Utils.isUndefined(localStationInfo.numberOfPhases)
          ? localStationInfo.numberOfPhases
          : 3;
      case CurrentType.DC:
        return 0;
    }
  }

  public isWebSocketConnectionOpened(): boolean {
    return this?.wsConnection?.readyState === WebSocket.OPEN;
  }

  public getRegistrationStatus(): RegistrationStatus {
    return this?.bootNotificationResponse?.status;
  }

  public isInUnknownState(): boolean {
    return Utils.isNullOrUndefined(this?.bootNotificationResponse?.status);
  }

  public isInPendingState(): boolean {
    return this?.bootNotificationResponse?.status === RegistrationStatus.PENDING;
  }

  public isInAcceptedState(): boolean {
    return this?.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
  }

  public isInRejectedState(): boolean {
    return this?.bootNotificationResponse?.status === RegistrationStatus.REJECTED;
  }

  public isRegistered(): boolean {
    return !this.isInUnknownState() && (this.isInAcceptedState() || this.isInPendingState());
  }

  public isChargingStationAvailable(): boolean {
    return this.getConnectorStatus(0).availability === AvailabilityType.OPERATIVE;
  }

  public isConnectorAvailable(id: number): boolean {
    return id > 0 && this.getConnectorStatus(id).availability === AvailabilityType.OPERATIVE;
  }

  public getNumberOfConnectors(): number {
    return this.connectors.get(0) ? this.connectors.size - 1 : this.connectors.size;
  }

  public getConnectorStatus(id: number): ConnectorStatus | undefined {
    return this.connectors.get(id);
  }

  public getCurrentOutType(stationInfo?: ChargingStationInfo): CurrentType {
    return (stationInfo ?? this.stationInfo).currentOutType ?? CurrentType.AC;
  }

  public getOcppStrictCompliance(): boolean {
    return this.stationInfo?.ocppStrictCompliance ?? false;
  }

  public getVoltageOut(stationInfo?: ChargingStationInfo): number | undefined {
    const defaultVoltageOut = ChargingStationUtils.getDefaultVoltageOut(
      this.getCurrentOutType(stationInfo),
      this.templateFile,
      this.logPrefix()
    );
    const localStationInfo: ChargingStationInfo = stationInfo ?? this.stationInfo;
    return !Utils.isUndefined(localStationInfo.voltageOut)
      ? localStationInfo.voltageOut
      : defaultVoltageOut;
  }

  public getConnectorMaximumAvailablePower(connectorId: number): number {
    let connectorAmperageLimitationPowerLimit: number;
    if (
      !Utils.isNullOrUndefined(this.getAmperageLimitation()) &&
      this.getAmperageLimitation() < this.stationInfo.maximumAmperage
    ) {
      connectorAmperageLimitationPowerLimit =
        (this.getCurrentOutType() === CurrentType.AC
          ? ACElectricUtils.powerTotal(
              this.getNumberOfPhases(),
              this.getVoltageOut(),
              this.getAmperageLimitation() * this.getNumberOfConnectors()
            )
          : DCElectricUtils.power(this.getVoltageOut(), this.getAmperageLimitation())) /
        this.powerDivider;
    }
    const connectorMaximumPower = this.getMaximumPower() / this.powerDivider;
    const connectorChargingProfilePowerLimit = this.getChargingProfilePowerLimit(connectorId);
    return Math.min(
      isNaN(connectorMaximumPower) ? Infinity : connectorMaximumPower,
      isNaN(connectorAmperageLimitationPowerLimit)
        ? Infinity
        : connectorAmperageLimitationPowerLimit,
      isNaN(connectorChargingProfilePowerLimit) ? Infinity : connectorChargingProfilePowerLimit
    );
  }

  public getTransactionIdTag(transactionId: number): string | undefined {
    for (const connectorId of this.connectors.keys()) {
      if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
        return this.getConnectorStatus(connectorId).transactionIdTag;
      }
    }
  }

  public getOutOfOrderEndMeterValues(): boolean {
    return this.stationInfo?.outOfOrderEndMeterValues ?? false;
  }

  public getBeginEndMeterValues(): boolean {
    return this.stationInfo?.beginEndMeterValues ?? false;
  }

  public getMeteringPerTransaction(): boolean {
    return this.stationInfo?.meteringPerTransaction ?? true;
  }

  public getTransactionDataMeterValues(): boolean {
    return this.stationInfo?.transactionDataMeterValues ?? false;
  }

  public getMainVoltageMeterValues(): boolean {
    return this.stationInfo?.mainVoltageMeterValues ?? true;
  }

  public getPhaseLineToLineVoltageMeterValues(): boolean {
    return this.stationInfo?.phaseLineToLineVoltageMeterValues ?? false;
  }

  public getCustomValueLimitationMeterValues(): boolean {
    return this.stationInfo?.customValueLimitationMeterValues ?? true;
  }

  public getConnectorIdByTransactionId(transactionId: number): number | undefined {
    for (const connectorId of this.connectors.keys()) {
      if (
        connectorId > 0 &&
        this.getConnectorStatus(connectorId)?.transactionId === transactionId
      ) {
        return connectorId;
      }
    }
  }

  public getEnergyActiveImportRegisterByTransactionId(
    transactionId: number,
    meterStop = false
  ): number {
    return this.getEnergyActiveImportRegister(
      this.getConnectorStatus(this.getConnectorIdByTransactionId(transactionId)),
      meterStop
    );
  }

  public getEnergyActiveImportRegisterByConnectorId(connectorId: number): number {
    return this.getEnergyActiveImportRegister(this.getConnectorStatus(connectorId));
  }

  public getAuthorizeRemoteTxRequests(): boolean {
    const authorizeRemoteTxRequests = ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.AuthorizeRemoteTxRequests
    );
    return authorizeRemoteTxRequests
      ? Utils.convertToBoolean(authorizeRemoteTxRequests.value)
      : false;
  }

  public getLocalAuthListEnabled(): boolean {
    const localAuthListEnabled = ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.LocalAuthListEnabled
    );
    return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
  }

  public startHeartbeat(): void {
    if (
      this.getHeartbeatInterval() &&
      this.getHeartbeatInterval() > 0 &&
      !this.heartbeatSetInterval
    ) {
      // eslint-disable-next-line @typescript-eslint/no-misused-promises
      this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
        await this.ocppRequestService.requestHandler<HeartbeatRequest, HeartbeatResponse>(
          this,
          RequestCommand.HEARTBEAT
        );
      }, this.getHeartbeatInterval());
      logger.info(
        this.logPrefix() +
          ' Heartbeat started every ' +
          Utils.formatDurationMilliSeconds(this.getHeartbeatInterval())
      );
    } else if (this.heartbeatSetInterval) {
      logger.info(
        this.logPrefix() +
          ' Heartbeat already started every ' +
          Utils.formatDurationMilliSeconds(this.getHeartbeatInterval())
      );
    } else {
      logger.error(
        `${this.logPrefix()} Heartbeat interval set to ${
          this.getHeartbeatInterval()
            ? Utils.formatDurationMilliSeconds(this.getHeartbeatInterval())
            : this.getHeartbeatInterval()
        }, not starting the heartbeat`
      );
    }
  }

  public restartHeartbeat(): void {
    // Stop heartbeat
    this.stopHeartbeat();
    // Start heartbeat
    this.startHeartbeat();
  }

  public restartWebSocketPing(): void {
    // Stop WebSocket ping
    this.stopWebSocketPing();
    // Start WebSocket ping
    this.startWebSocketPing();
  }

  public startMeterValues(connectorId: number, interval: number): void {
    if (connectorId === 0) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`
      );
      return;
    }
    if (!this.getConnectorStatus(connectorId)) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`
      );
      return;
    }
    if (this.getConnectorStatus(connectorId)?.transactionStarted === false) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`
      );
      return;
    } else if (
      this.getConnectorStatus(connectorId)?.transactionStarted === true &&
      !this.getConnectorStatus(connectorId)?.transactionId
    ) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`
      );
      return;
    }
    if (interval > 0) {
      // eslint-disable-next-line @typescript-eslint/no-misused-promises
      this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(
        // eslint-disable-next-line @typescript-eslint/no-misused-promises
        async (): Promise<void> => {
          // FIXME: Implement OCPP version agnostic helpers
          const meterValue: MeterValue = OCPP16ServiceUtils.buildMeterValue(
            this,
            connectorId,
            this.getConnectorStatus(connectorId).transactionId,
            interval
          );
          await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
            this,
            RequestCommand.METER_VALUES,
            {
              connectorId,
              transactionId: this.getConnectorStatus(connectorId).transactionId,
              meterValue: [meterValue],
            }
          );
        },
        interval
      );
    } else {
      logger.error(
        `${this.logPrefix()} Charging station ${
          StandardParametersKey.MeterValueSampleInterval
        } configuration set to ${
          interval ? Utils.formatDurationMilliSeconds(interval) : interval
        }, not sending MeterValues`
      );
    }
  }

  public start(): void {
    if (this.started === false) {
      if (this.starting === false) {
        this.starting = true;
        if (this.getEnableStatistics()) {
          this.performanceStatistics.start();
        }
        this.openWSConnection();
        // Monitor charging station template file
        this.templateFileWatcher = FileUtils.watchJsonFile(
          this.logPrefix(),
          FileType.ChargingStationTemplate,
          this.templateFile,
          null,
          (event, filename): void => {
            if (filename && event === 'change') {
              try {
                logger.debug(
                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} ${
                    this.templateFile
                  } file have changed, reload`
                );
                this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
                // Initialize
                this.initialize();
                // Restart the ATG
                this.stopAutomaticTransactionGenerator();
                if (
                  this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true
                ) {
                  this.startAutomaticTransactionGenerator();
                }
                if (this.getEnableStatistics()) {
                  this.performanceStatistics.restart();
                } else {
                  this.performanceStatistics.stop();
                }
                // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
              } catch (error) {
                logger.error(
                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} file monitoring error:`,
                  error
                );
              }
            }
          }
        );
        this.started = true;
        parentPort.postMessage(MessageChannelUtils.buildStartedMessage(this));
        this.starting = false;
      } else {
        logger.warn(`${this.logPrefix()} Charging station is already starting...`);
      }
    } else {
      logger.warn(`${this.logPrefix()} Charging station is already started...`);
    }
  }

  public async stop(reason?: StopTransactionReason): Promise<void> {
    if (this.started === true) {
      if (this.stopping === false) {
        this.stopping = true;
        await this.stopMessageSequence(reason);
        for (const connectorId of this.connectors.keys()) {
          if (connectorId > 0) {
            await this.ocppRequestService.requestHandler<
              StatusNotificationRequest,
              StatusNotificationResponse
            >(this, RequestCommand.STATUS_NOTIFICATION, {
              connectorId,
              status: ChargePointStatus.UNAVAILABLE,
              errorCode: ChargePointErrorCode.NO_ERROR,
            });
            this.getConnectorStatus(connectorId).status = null;
          }
        }
        this.closeWSConnection();
        this.wsConnectionRestarted = false;
        if (this.getEnableStatistics()) {
          this.performanceStatistics.stop();
        }
        this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
        this.templateFileWatcher.close();
        this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
        this.bootNotificationResponse = null;
        this.started = false;
        parentPort.postMessage(MessageChannelUtils.buildStoppedMessage(this));
        this.stopping = false;
      } else {
        logger.warn(`${this.logPrefix()} Charging station is already stopping...`);
      }
    } else {
      logger.warn(`${this.logPrefix()} Charging station is already stopped...`);
    }
  }

  public async reset(reason?: StopTransactionReason): Promise<void> {
    await this.stop(reason);
    await Utils.sleep(this.stationInfo.resetTime);
    this.initialize();
    this.start();
  }

  public saveOcppConfiguration(): void {
    if (this.getOcppPersistentConfiguration()) {
      this.saveConfiguration();
    }
  }

  public resetConnectorStatus(connectorId: number): void {
    this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
    this.getConnectorStatus(connectorId).idTagAuthorized = false;
    this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
    this.getConnectorStatus(connectorId).transactionStarted = false;
    delete this.getConnectorStatus(connectorId).localAuthorizeIdTag;
    delete this.getConnectorStatus(connectorId).authorizeIdTag;
    delete this.getConnectorStatus(connectorId).transactionId;
    delete this.getConnectorStatus(connectorId).transactionIdTag;
    this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
    delete this.getConnectorStatus(connectorId).transactionBeginMeterValue;
    this.stopMeterValues(connectorId);
    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
  }

  public hasFeatureProfile(featureProfile: SupportedFeatureProfiles): boolean {
    return ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.SupportedFeatureProfiles
    )?.value.includes(featureProfile);
  }

  public bufferMessage(message: string): void {
    this.messageBuffer.add(message);
  }

  public openWSConnection(
    options: WsOptions = this.stationInfo?.wsOptions ?? {},
    params: { closeOpened?: boolean; terminateOpened?: boolean } = {
      closeOpened: false,
      terminateOpened: false,
    }
  ): void {
    options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
    params.closeOpened = params?.closeOpened ?? false;
    params.terminateOpened = params?.terminateOpened ?? false;
    if (
      !Utils.isNullOrUndefined(this.stationInfo.supervisionUser) &&
      !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)
    ) {
      options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
    }
    if (params?.closeOpened) {
      this.closeWSConnection();
    }
    if (params?.terminateOpened) {
      this.terminateWSConnection();
    }
    let protocol: string;
    switch (this.getOcppVersion()) {
      case OCPPVersion.VERSION_16:
        protocol = 'ocpp' + OCPPVersion.VERSION_16;
        break;
      default:
        this.handleUnsupportedVersion(this.getOcppVersion());
        break;
    }

    if (this.isWebSocketConnectionOpened() === true) {
      logger.warn(
        `${this.logPrefix()} OCPP connection to URL ${this.wsConnectionUrl.toString()} is already opened`
      );
      return;
    }

    logger.info(
      `${this.logPrefix()} Open OCPP connection to URL ${this.wsConnectionUrl.toString()}`
    );

    this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);

    // Handle WebSocket message
    this.wsConnection.on(
      'message',
      this.onMessage.bind(this) as (this: WebSocket, data: RawData, isBinary: boolean) => void
    );
    // Handle WebSocket error
    this.wsConnection.on(
      'error',
      this.onError.bind(this) as (this: WebSocket, error: Error) => void
    );
    // Handle WebSocket close
    this.wsConnection.on(
      'close',
      this.onClose.bind(this) as (this: WebSocket, code: number, reason: Buffer) => void
    );
    // Handle WebSocket open
    this.wsConnection.on('open', this.onOpen.bind(this) as (this: WebSocket) => void);
    // Handle WebSocket ping
    this.wsConnection.on('ping', this.onPing.bind(this) as (this: WebSocket, data: Buffer) => void);
    // Handle WebSocket pong
    this.wsConnection.on('pong', this.onPong.bind(this) as (this: WebSocket, data: Buffer) => void);
  }

  public closeWSConnection(): void {
    if (this.isWebSocketConnectionOpened() === true) {
      this.wsConnection.close();
      this.wsConnection = null;
    }
  }

  public startAutomaticTransactionGenerator(
    connectorIds?: number[],
    automaticTransactionGeneratorConfiguration?: AutomaticTransactionGeneratorConfiguration
  ): void {
    this.automaticTransactionGenerator = AutomaticTransactionGenerator.getInstance(
      automaticTransactionGeneratorConfiguration ??
        this.getAutomaticTransactionGeneratorConfigurationFromTemplate(),
      this
    );
    if (!Utils.isEmptyArray(connectorIds)) {
      for (const connectorId of connectorIds) {
        this.automaticTransactionGenerator.startConnector(connectorId);
      }
    } else {
      this.automaticTransactionGenerator.start();
    }
    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
  }

  public stopAutomaticTransactionGenerator(connectorIds?: number[]): void {
    if (!Utils.isEmptyArray(connectorIds)) {
      for (const connectorId of connectorIds) {
        this.automaticTransactionGenerator?.stopConnector(connectorId);
      }
    } else {
      this.automaticTransactionGenerator?.stop();
    }
    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
  }

  public async stopTransactionOnConnector(
    connectorId: number,
    reason = StopTransactionReason.NONE
  ): Promise<StopTransactionResponse> {
    const transactionId = this.getConnectorStatus(connectorId).transactionId;
    if (
      this.getBeginEndMeterValues() &&
      this.getOcppStrictCompliance() &&
      !this.getOutOfOrderEndMeterValues()
    ) {
      // FIXME: Implement OCPP version agnostic helpers
      const transactionEndMeterValue = OCPP16ServiceUtils.buildTransactionEndMeterValue(
        this,
        connectorId,
        this.getEnergyActiveImportRegisterByTransactionId(transactionId)
      );
      await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
        this,
        RequestCommand.METER_VALUES,
        {
          connectorId,
          transactionId,
          meterValue: [transactionEndMeterValue],
        }
      );
    }
    return this.ocppRequestService.requestHandler<StopTransactionRequest, StopTransactionResponse>(
      this,
      RequestCommand.STOP_TRANSACTION,
      {
        transactionId,
        meterStop: this.getEnergyActiveImportRegisterByTransactionId(transactionId, true),
        reason,
      }
    );
  }

  private flushMessageBuffer(): void {
    if (this.messageBuffer.size > 0) {
      this.messageBuffer.forEach((message) => {
        // TODO: evaluate the need to track performance
        this.wsConnection.send(message);
        this.messageBuffer.delete(message);
      });
    }
  }

  private getSupervisionUrlOcppConfiguration(): boolean {
    return this.stationInfo.supervisionUrlOcppConfiguration ?? false;
  }

  private getSupervisionUrlOcppKey(): string {
    return this.stationInfo.supervisionUrlOcppKey ?? VendorDefaultParametersKey.ConnectionUrl;
  }

  private getTemplateFromFile(): ChargingStationTemplate | null {
    let template: ChargingStationTemplate = null;
    try {
      if (this.sharedLRUCache.hasChargingStationTemplate(this.stationInfo?.templateHash)) {
        template = this.sharedLRUCache.getChargingStationTemplate(this.stationInfo.templateHash);
      } else {
        const measureId = `${FileType.ChargingStationTemplate} read`;
        const beginId = PerformanceStatistics.beginMeasure(measureId);
        template = JSON.parse(
          fs.readFileSync(this.templateFile, 'utf8')
        ) as ChargingStationTemplate;
        PerformanceStatistics.endMeasure(measureId, beginId);
        template.templateHash = crypto
          .createHash(Constants.DEFAULT_HASH_ALGORITHM)
          .update(JSON.stringify(template))
          .digest('hex');
        this.sharedLRUCache.setChargingStationTemplate(template);
      }
    } catch (error) {
      FileUtils.handleFileException(
        this.logPrefix(),
        FileType.ChargingStationTemplate,
        this.templateFile,
        error as NodeJS.ErrnoException
      );
    }
    return template;
  }

  private getStationInfoFromTemplate(): ChargingStationInfo {
    const stationTemplate: ChargingStationTemplate = this.getTemplateFromFile();
    if (Utils.isNullOrUndefined(stationTemplate)) {
      const errorMsg = 'Failed to read charging station template file';
      logger.error(`${this.logPrefix()} ${errorMsg}`);
      throw new BaseError(errorMsg);
    }
    if (Utils.isEmptyObject(stationTemplate)) {
      const errorMsg = `Empty charging station information from template file ${this.templateFile}`;
      logger.error(`${this.logPrefix()} ${errorMsg}`);
      throw new BaseError(errorMsg);
    }
    // Deprecation template keys section
    ChargingStationUtils.warnDeprecatedTemplateKey(
      stationTemplate,
      'supervisionUrl',
      this.templateFile,
      this.logPrefix(),
      "Use 'supervisionUrls' instead"
    );
    ChargingStationUtils.convertDeprecatedTemplateKey(
      stationTemplate,
      'supervisionUrl',
      'supervisionUrls'
    );
    const stationInfo: ChargingStationInfo =
      ChargingStationUtils.stationTemplateToStationInfo(stationTemplate);
    stationInfo.hashId = ChargingStationUtils.getHashId(this.index, stationTemplate);
    stationInfo.chargingStationId = ChargingStationUtils.getChargingStationId(
      this.index,
      stationTemplate
    );
    ChargingStationUtils.createSerialNumber(stationTemplate, stationInfo);
    if (!Utils.isEmptyArray(stationTemplate.power)) {
      stationTemplate.power = stationTemplate.power as number[];
      const powerArrayRandomIndex = Math.floor(Utils.secureRandom() * stationTemplate.power.length);
      stationInfo.maximumPower =
        stationTemplate.powerUnit === PowerUnits.KILO_WATT
          ? stationTemplate.power[powerArrayRandomIndex] * 1000
          : stationTemplate.power[powerArrayRandomIndex];
    } else {
      stationTemplate.power = stationTemplate.power as number;
      stationInfo.maximumPower =
        stationTemplate.powerUnit === PowerUnits.KILO_WATT
          ? stationTemplate.power * 1000
          : stationTemplate.power;
    }
    stationInfo.resetTime = stationTemplate.resetTime
      ? stationTemplate.resetTime * 1000
      : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
    const configuredMaxConnectors =
      ChargingStationUtils.getConfiguredNumberOfConnectors(stationTemplate);
    ChargingStationUtils.checkConfiguredMaxConnectors(
      configuredMaxConnectors,
      this.templateFile,
      this.logPrefix()
    );
    const templateMaxConnectors =
      ChargingStationUtils.getTemplateMaxNumberOfConnectors(stationTemplate);
    ChargingStationUtils.checkTemplateMaxConnectors(
      templateMaxConnectors,
      this.templateFile,
      this.logPrefix()
    );
    if (
      configuredMaxConnectors >
        (stationTemplate?.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) &&
      !stationTemplate?.randomConnectors
    ) {
      logger.warn(
        `${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${
          this.templateFile
        }, forcing random connector configurations affectation`
      );
      stationInfo.randomConnectors = true;
    }
    // Build connectors if needed (FIXME: should be factored out)
    this.initializeConnectors(stationInfo, configuredMaxConnectors, templateMaxConnectors);
    stationInfo.maximumAmperage = this.getMaximumAmperage(stationInfo);
    ChargingStationUtils.createStationInfoHash(stationInfo);
    return stationInfo;
  }

  private getStationInfoFromFile(): ChargingStationInfo | null {
    let stationInfo: ChargingStationInfo = null;
    this.getStationInfoPersistentConfiguration() &&
      (stationInfo = this.getConfigurationFromFile()?.stationInfo ?? null);
    stationInfo && ChargingStationUtils.createStationInfoHash(stationInfo);
    return stationInfo;
  }

  private getStationInfo(): ChargingStationInfo {
    const stationInfoFromTemplate: ChargingStationInfo = this.getStationInfoFromTemplate();
    const stationInfoFromFile: ChargingStationInfo = this.getStationInfoFromFile();
    // Priority: charging station info from template > charging station info from configuration file > charging station info attribute
    if (stationInfoFromFile?.templateHash === stationInfoFromTemplate.templateHash) {
      if (this.stationInfo?.infoHash === stationInfoFromFile?.infoHash) {
        return this.stationInfo;
      }
      return stationInfoFromFile;
    }
    stationInfoFromFile &&
      ChargingStationUtils.propagateSerialNumber(
        this.getTemplateFromFile(),
        stationInfoFromFile,
        stationInfoFromTemplate
      );
    return stationInfoFromTemplate;
  }

  private saveStationInfo(): void {
    if (this.getStationInfoPersistentConfiguration()) {
      this.saveConfiguration();
    }
  }

  private getOcppVersion(): OCPPVersion {
    return this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16;
  }

  private getOcppPersistentConfiguration(): boolean {
    return this.stationInfo?.ocppPersistentConfiguration ?? true;
  }

  private getStationInfoPersistentConfiguration(): boolean {
    return this.stationInfo?.stationInfoPersistentConfiguration ?? true;
  }

  private handleUnsupportedVersion(version: OCPPVersion) {
    const errMsg = `Unsupported protocol version '${version}' configured in template file ${this.templateFile}`;
    logger.error(`${this.logPrefix()} ${errMsg}`);
    throw new BaseError(errMsg);
  }

  private initialize(): void {
    this.configurationFile = path.join(
      path.dirname(this.templateFile.replace('station-templates', 'configurations')),
      ChargingStationUtils.getHashId(this.index, this.getTemplateFromFile()) + '.json'
    );
    this.stationInfo = this.getStationInfo();
    this.saveStationInfo();
    // Avoid duplication of connectors related information in RAM
    this.stationInfo?.Connectors && delete this.stationInfo.Connectors;
    this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl();
    if (this.getEnableStatistics()) {
      this.performanceStatistics = PerformanceStatistics.getInstance(
        this.stationInfo.hashId,
        this.stationInfo.chargingStationId,
        this.configuredSupervisionUrl
      );
    }
    this.bootNotificationRequest = ChargingStationUtils.createBootNotificationRequest(
      this.stationInfo
    );
    this.powerDivider = this.getPowerDivider();
    // OCPP configuration
    this.ocppConfiguration = this.getOcppConfiguration();
    this.initializeOcppConfiguration();
    switch (this.getOcppVersion()) {
      case OCPPVersion.VERSION_16:
        this.ocppIncomingRequestService =
          OCPP16IncomingRequestService.getInstance<OCPP16IncomingRequestService>();
        this.ocppRequestService = OCPP16RequestService.getInstance<OCPP16RequestService>(
          OCPP16ResponseService.getInstance<OCPP16ResponseService>()
        );
        break;
      default:
        this.handleUnsupportedVersion(this.getOcppVersion());
        break;
    }
    if (this.stationInfo?.autoRegister) {
      this.bootNotificationResponse = {
        currentTime: new Date().toISOString(),
        interval: this.getHeartbeatInterval() / 1000,
        status: RegistrationStatus.ACCEPTED,
      };
    }
  }

  private initializeOcppConfiguration(): void {
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.HeartbeatInterval
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.HeartbeatInterval,
        '0'
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.HeartBeatInterval
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.HeartBeatInterval,
        '0',
        { visible: false }
      );
    }
    if (
      this.getSupervisionUrlOcppConfiguration() &&
      !ChargingStationConfigurationUtils.getConfigurationKey(this, this.getSupervisionUrlOcppKey())
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        this.getSupervisionUrlOcppKey(),
        this.configuredSupervisionUrl.href,
        { reboot: true }
      );
    } else if (
      !this.getSupervisionUrlOcppConfiguration() &&
      ChargingStationConfigurationUtils.getConfigurationKey(this, this.getSupervisionUrlOcppKey())
    ) {
      ChargingStationConfigurationUtils.deleteConfigurationKey(
        this,
        this.getSupervisionUrlOcppKey(),
        { save: false }
      );
    }
    if (
      this.stationInfo.amperageLimitationOcppKey &&
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        this.stationInfo.amperageLimitationOcppKey
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        this.stationInfo.amperageLimitationOcppKey,
        (
          this.stationInfo.maximumAmperage *
          ChargingStationUtils.getAmperageLimitationUnitDivider(this.stationInfo)
        ).toString()
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.SupportedFeatureProfiles
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.SupportedFeatureProfiles,
        `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.FirmwareManagement},${SupportedFeatureProfiles.LocalAuthListManagement},${SupportedFeatureProfiles.SmartCharging},${SupportedFeatureProfiles.RemoteTrigger}`
      );
    }
    ChargingStationConfigurationUtils.addConfigurationKey(
      this,
      StandardParametersKey.NumberOfConnectors,
      this.getNumberOfConnectors().toString(),
      { readonly: true },
      { overwrite: true }
    );
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.MeterValuesSampledData
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.MeterValuesSampledData,
        MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.ConnectorPhaseRotation
      )
    ) {
      const connectorPhaseRotation = [];
      for (const connectorId of this.connectors.keys()) {
        // AC/DC
        if (connectorId === 0 && this.getNumberOfPhases() === 0) {
          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
        } else if (connectorId > 0 && this.getNumberOfPhases() === 0) {
          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
          // AC
        } else if (connectorId > 0 && this.getNumberOfPhases() === 1) {
          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
        } else if (connectorId > 0 && this.getNumberOfPhases() === 3) {
          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
        }
      }
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.ConnectorPhaseRotation,
        connectorPhaseRotation.toString()
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.AuthorizeRemoteTxRequests
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.AuthorizeRemoteTxRequests,
        'true'
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.LocalAuthListEnabled
      ) &&
      ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.SupportedFeatureProfiles
      )?.value.includes(SupportedFeatureProfiles.LocalAuthListManagement)
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.LocalAuthListEnabled,
        'false'
      );
    }
    if (
      !ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.ConnectionTimeOut
      )
    ) {
      ChargingStationConfigurationUtils.addConfigurationKey(
        this,
        StandardParametersKey.ConnectionTimeOut,
        Constants.DEFAULT_CONNECTION_TIMEOUT.toString()
      );
    }
    this.saveOcppConfiguration();
  }

  private initializeConnectors(
    stationInfo: ChargingStationInfo,
    configuredMaxConnectors: number,
    templateMaxConnectors: number
  ): void {
    if (!stationInfo?.Connectors && this.connectors.size === 0) {
      const logMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`;
      logger.error(`${this.logPrefix()} ${logMsg}`);
      throw new BaseError(logMsg);
    }
    if (!stationInfo?.Connectors[0]) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no connector Id 0 configuration`
      );
    }
    if (stationInfo?.Connectors) {
      const connectorsConfigHash = crypto
        .createHash(Constants.DEFAULT_HASH_ALGORITHM)
        .update(JSON.stringify(stationInfo?.Connectors) + configuredMaxConnectors.toString())
        .digest('hex');
      const connectorsConfigChanged =
        this.connectors?.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash;
      if (this.connectors?.size === 0 || connectorsConfigChanged) {
        connectorsConfigChanged && this.connectors.clear();
        this.connectorsConfigurationHash = connectorsConfigHash;
        // Add connector Id 0
        let lastConnector = '0';
        for (lastConnector in stationInfo?.Connectors) {
          const connectorStatus = stationInfo?.Connectors[lastConnector];
          const lastConnectorId = Utils.convertToInt(lastConnector);
          if (
            lastConnectorId === 0 &&
            this.getUseConnectorId0(stationInfo) === true &&
            connectorStatus
          ) {
            this.checkStationInfoConnectorStatus(lastConnectorId, connectorStatus);
            this.connectors.set(
              lastConnectorId,
              Utils.cloneObject<ConnectorStatus>(connectorStatus)
            );
            this.getConnectorStatus(lastConnectorId).availability = AvailabilityType.OPERATIVE;
            if (Utils.isUndefined(this.getConnectorStatus(lastConnectorId)?.chargingProfiles)) {
              this.getConnectorStatus(lastConnectorId).chargingProfiles = [];
            }
          }
        }
        // Generate all connectors
        if ((stationInfo?.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
          for (let index = 1; index <= configuredMaxConnectors; index++) {
            const randConnectorId = stationInfo?.randomConnectors
              ? Utils.getRandomInteger(Utils.convertToInt(lastConnector), 1)
              : index;
            const connectorStatus = stationInfo?.Connectors[randConnectorId.toString()];
            this.checkStationInfoConnectorStatus(randConnectorId, connectorStatus);
            this.connectors.set(index, Utils.cloneObject<ConnectorStatus>(connectorStatus));
            this.getConnectorStatus(index).availability = AvailabilityType.OPERATIVE;
            if (Utils.isUndefined(this.getConnectorStatus(index)?.chargingProfiles)) {
              this.getConnectorStatus(index).chargingProfiles = [];
            }
          }
        }
      }
    } else {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no connectors configuration defined, using already defined connectors`
      );
    }
    // Initialize transaction attributes on connectors
    for (const connectorId of this.connectors.keys()) {
      if (
        connectorId > 0 &&
        (this.getConnectorStatus(connectorId).transactionStarted === undefined ||
          this.getConnectorStatus(connectorId).transactionStarted === false)
      ) {
        this.initializeConnectorStatus(connectorId);
      }
    }
  }

  private checkStationInfoConnectorStatus(
    connectorId: number,
    connectorStatus: ConnectorStatus
  ): void {
    if (!Utils.isNullOrUndefined(connectorStatus?.status)) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with connector ${connectorId} status configuration defined, undefine it`
      );
      connectorStatus.status = undefined;
    }
  }

  private getConfigurationFromFile(): ChargingStationConfiguration | null {
    let configuration: ChargingStationConfiguration = null;
    if (this.configurationFile && fs.existsSync(this.configurationFile)) {
      try {
        if (this.sharedLRUCache.hasChargingStationConfiguration(this.configurationFileHash)) {
          configuration = this.sharedLRUCache.getChargingStationConfiguration(
            this.configurationFileHash
          );
        } else {
          const measureId = `${FileType.ChargingStationConfiguration} read`;
          const beginId = PerformanceStatistics.beginMeasure(measureId);
          configuration = JSON.parse(
            fs.readFileSync(this.configurationFile, 'utf8')
          ) as ChargingStationConfiguration;
          PerformanceStatistics.endMeasure(measureId, beginId);
          this.configurationFileHash = configuration.configurationHash;
          this.sharedLRUCache.setChargingStationConfiguration(configuration);
        }
      } catch (error) {
        FileUtils.handleFileException(
          this.logPrefix(),
          FileType.ChargingStationConfiguration,
          this.configurationFile,
          error as NodeJS.ErrnoException
        );
      }
    }
    return configuration;
  }

  private saveConfiguration(): void {
    if (this.configurationFile) {
      try {
        if (!fs.existsSync(path.dirname(this.configurationFile))) {
          fs.mkdirSync(path.dirname(this.configurationFile), { recursive: true });
        }
        const configurationData: ChargingStationConfiguration =
          this.getConfigurationFromFile() ?? {};
        this.ocppConfiguration?.configurationKey &&
          (configurationData.configurationKey = this.ocppConfiguration.configurationKey);
        this.stationInfo && (configurationData.stationInfo = this.stationInfo);
        delete configurationData.configurationHash;
        const configurationHash = crypto
          .createHash(Constants.DEFAULT_HASH_ALGORITHM)
          .update(JSON.stringify(configurationData))
          .digest('hex');
        if (this.configurationFileHash !== configurationHash) {
          configurationData.configurationHash = configurationHash;
          const measureId = `${FileType.ChargingStationConfiguration} write`;
          const beginId = PerformanceStatistics.beginMeasure(measureId);
          const fileDescriptor = fs.openSync(this.configurationFile, 'w');
          fs.writeFileSync(fileDescriptor, JSON.stringify(configurationData, null, 2), 'utf8');
          fs.closeSync(fileDescriptor);
          PerformanceStatistics.endMeasure(measureId, beginId);
          this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
          this.configurationFileHash = configurationHash;
          this.sharedLRUCache.setChargingStationConfiguration(configurationData);
        } else {
          logger.debug(
            `${this.logPrefix()} Not saving unchanged charging station configuration file ${
              this.configurationFile
            }`
          );
        }
      } catch (error) {
        FileUtils.handleFileException(
          this.logPrefix(),
          FileType.ChargingStationConfiguration,
          this.configurationFile,
          error as NodeJS.ErrnoException
        );
      }
    } else {
      logger.error(
        `${this.logPrefix()} Trying to save charging station configuration to undefined configuration file`
      );
    }
  }

  private getOcppConfigurationFromTemplate(): ChargingStationOcppConfiguration | null {
    return this.getTemplateFromFile()?.Configuration ?? null;
  }

  private getOcppConfigurationFromFile(): ChargingStationOcppConfiguration | null {
    let configuration: ChargingStationConfiguration = null;
    if (this.getOcppPersistentConfiguration()) {
      const configurationFromFile = this.getConfigurationFromFile();
      configuration = configurationFromFile?.configurationKey && configurationFromFile;
    }
    configuration && delete configuration.stationInfo;
    return configuration;
  }

  private getOcppConfiguration(): ChargingStationOcppConfiguration | null {
    let ocppConfiguration: ChargingStationOcppConfiguration = this.getOcppConfigurationFromFile();
    if (!ocppConfiguration) {
      ocppConfiguration = this.getOcppConfigurationFromTemplate();
    }
    return ocppConfiguration;
  }

  private async onOpen(): Promise<void> {
    if (this.isWebSocketConnectionOpened() === true) {
      logger.info(
        `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} succeeded`
      );
      if (!this.isRegistered()) {
        // Send BootNotification
        let registrationRetryCount = 0;
        do {
          this.bootNotificationResponse = await this.ocppRequestService.requestHandler<
            BootNotificationRequest,
            BootNotificationResponse
          >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
            skipBufferingOnError: true,
          });
          if (!this.isRegistered()) {
            this.getRegistrationMaxRetries() !== -1 && registrationRetryCount++;
            await Utils.sleep(
              this.bootNotificationResponse?.interval
                ? this.bootNotificationResponse.interval * 1000
                : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL
            );
          }
        } while (
          !this.isRegistered() &&
          (registrationRetryCount <= this.getRegistrationMaxRetries() ||
            this.getRegistrationMaxRetries() === -1)
        );
      }
      if (this.isRegistered()) {
        if (this.isInAcceptedState()) {
          await this.startMessageSequence();
        }
      } else {
        logger.error(
          `${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`
        );
      }
      this.wsConnectionRestarted = false;
      this.autoReconnectRetryCount = 0;
      parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
    } else {
      logger.warn(
        `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} failed`
      );
    }
  }

  private async onClose(code: number, reason: string): Promise<void> {
    switch (code) {
      // Normal close
      case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
      case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
        logger.info(
          `${this.logPrefix()} WebSocket normally closed with status '${Utils.getWebSocketCloseEventStatusString(
            code
          )}' and reason '${reason}'`
        );
        this.autoReconnectRetryCount = 0;
        break;
      // Abnormal close
      default:
        logger.error(
          `${this.logPrefix()} WebSocket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(
            code
          )}' and reason '${reason}'`
        );
        this.started === true && (await this.reconnect());
        break;
    }
    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
  }

  private async onMessage(data: Data): Promise<void> {
    let messageType: number;
    let messageId: string;
    let commandName: IncomingRequestCommand;
    let commandPayload: JsonType;
    let errorType: ErrorType;
    let errorMessage: string;
    let errorDetails: JsonType;
    let responseCallback: (payload: JsonType, requestPayload: JsonType) => void;
    let errorCallback: (error: OCPPError, requestStatistic?: boolean) => void;
    let requestCommandName: RequestCommand | IncomingRequestCommand;
    let requestPayload: JsonType;
    let cachedRequest: CachedRequest;
    let errMsg: string;
    try {
      const request = JSON.parse(data.toString()) as IncomingRequest | Response | ErrorResponse;
      if (Array.isArray(request) === true) {
        [messageType, messageId] = request;
        // Check the type of message
        switch (messageType) {
          // Incoming Message
          case MessageType.CALL_MESSAGE:
            [, , commandName, commandPayload] = request as IncomingRequest;
            if (this.getEnableStatistics() === true) {
              this.performanceStatistics.addRequestStatistic(commandName, messageType);
            }
            logger.debug(
              `${this.logPrefix()} << Command '${commandName}' received request payload: ${JSON.stringify(
                request
              )}`
            );
            // Process the message
            await this.ocppIncomingRequestService.incomingRequestHandler(
              this,
              messageId,
              commandName,
              commandPayload
            );
            break;
          // Outcome Message
          case MessageType.CALL_RESULT_MESSAGE:
            [, , commandPayload] = request as Response;
            if (this.requests.has(messageId) === false) {
              // Error
              throw new OCPPError(
                ErrorType.INTERNAL_ERROR,
                `Response for unknown message id ${messageId}`,
                null,
                commandPayload
              );
            }
            // Respond
            cachedRequest = this.requests.get(messageId);
            if (Array.isArray(cachedRequest) === true) {
              [responseCallback, errorCallback, requestCommandName, requestPayload] = cachedRequest;
            } else {
              throw new OCPPError(
                ErrorType.PROTOCOL_ERROR,
                `Cached request for message id ${messageId} response is not an array`,
                null,
                cachedRequest as unknown as JsonType
              );
            }
            logger.debug(
              `${this.logPrefix()} << Command '${
                requestCommandName ?? Constants.UNKNOWN_COMMAND
              }' received response payload: ${JSON.stringify(request)}`
            );
            responseCallback(commandPayload, requestPayload);
            break;
          // Error Message
          case MessageType.CALL_ERROR_MESSAGE:
            [, , errorType, errorMessage, errorDetails] = request as ErrorResponse;
            if (this.requests.has(messageId) === false) {
              // Error
              throw new OCPPError(
                ErrorType.INTERNAL_ERROR,
                `Error response for unknown message id ${messageId}`,
                null,
                { errorType, errorMessage, errorDetails }
              );
            }
            cachedRequest = this.requests.get(messageId);
            if (Array.isArray(cachedRequest) === true) {
              [, errorCallback, requestCommandName] = cachedRequest;
            } else {
              throw new OCPPError(
                ErrorType.PROTOCOL_ERROR,
                `Cached request for message id ${messageId} error response is not an array`,
                null,
                cachedRequest as unknown as JsonType
              );
            }
            logger.debug(
              `${this.logPrefix()} << Command '${
                requestCommandName ?? Constants.UNKNOWN_COMMAND
              }' received error payload: ${JSON.stringify(request)}`
            );
            errorCallback(new OCPPError(errorType, errorMessage, requestCommandName, errorDetails));
            break;
          // Error
          default:
            // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
            errMsg = `Wrong message type ${messageType}`;
            logger.error(`${this.logPrefix()} ${errMsg}`);
            throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg);
        }
        parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
      } else {
        throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming message is not an array', null, {
          request,
        });
      }
    } catch (error) {
      // Log
      logger.error(
        `${this.logPrefix()} Incoming OCPP command '${
          commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
        }' message '${data.toString()}'${
          messageType !== MessageType.CALL_MESSAGE
            ? ` matching cached request '${JSON.stringify(this.requests.get(messageId))}'`
            : ''
        } processing error:`,
        error
      );
      if (error instanceof OCPPError === false) {
        logger.warn(
          `${this.logPrefix()} Error thrown at incoming OCPP command '${
            commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
          }' message '${data.toString()}' handling is not an OCPPError:`,
          error
        );
      }
      switch (messageType) {
        case MessageType.CALL_MESSAGE:
          // Send error
          await this.ocppRequestService.sendError(
            this,
            messageId,
            error as OCPPError,
            commandName ?? requestCommandName ?? null
          );
          break;
        case MessageType.CALL_RESULT_MESSAGE:
        case MessageType.CALL_ERROR_MESSAGE:
          if (errorCallback) {
            // Reject the deferred promise in case of error at response handling (rejecting an already fulfilled promise is a no-op)
            errorCallback(error as OCPPError, false);
          } else {
            // Remove the request from the cache in case of error at response handling
            this.requests.delete(messageId);
          }
          break;
      }
    }
  }

  private onPing(): void {
    logger.debug(this.logPrefix() + ' Received a WS ping (rfc6455) from the server');
  }

  private onPong(): void {
    logger.debug(this.logPrefix() + ' Received a WS pong (rfc6455) from the server');
  }

  private onError(error: WSError): void {
    this.closeWSConnection();
    logger.error(this.logPrefix() + ' WebSocket error:', error);
  }

  private getEnergyActiveImportRegister(
    connectorStatus: ConnectorStatus,
    meterStop = false
  ): number {
    if (this.getMeteringPerTransaction() === true) {
      return (
        (meterStop === true
          ? Math.round(connectorStatus?.transactionEnergyActiveImportRegisterValue)
          : connectorStatus?.transactionEnergyActiveImportRegisterValue) ?? 0
      );
    }
    return (
      (meterStop === true
        ? Math.round(connectorStatus?.energyActiveImportRegisterValue)
        : connectorStatus?.energyActiveImportRegisterValue) ?? 0
    );
  }

  private getUseConnectorId0(stationInfo?: ChargingStationInfo): boolean {
    const localStationInfo = stationInfo ?? this.stationInfo;
    return !Utils.isUndefined(localStationInfo.useConnectorId0)
      ? localStationInfo.useConnectorId0
      : true;
  }

  private getNumberOfRunningTransactions(): number {
    let trxCount = 0;
    for (const connectorId of this.connectors.keys()) {
      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
        trxCount++;
      }
    }
    return trxCount;
  }

  private async stopRunningTransactions(reason = StopTransactionReason.NONE): Promise<void> {
    for (const connectorId of this.connectors.keys()) {
      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
        await this.stopTransactionOnConnector(connectorId, reason);
      }
    }
  }

  // 0 for disabling
  private getConnectionTimeout(): number {
    if (
      ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        StandardParametersKey.ConnectionTimeOut
      )
    ) {
      return (
        parseInt(
          ChargingStationConfigurationUtils.getConfigurationKey(
            this,
            StandardParametersKey.ConnectionTimeOut
          ).value
        ) ?? Constants.DEFAULT_CONNECTION_TIMEOUT
      );
    }
    return Constants.DEFAULT_CONNECTION_TIMEOUT;
  }

  // -1 for unlimited, 0 for disabling
  private getAutoReconnectMaxRetries(): number {
    if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
      return this.stationInfo.autoReconnectMaxRetries;
    }
    if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
      return Configuration.getAutoReconnectMaxRetries();
    }
    return -1;
  }

  // 0 for disabling
  private getRegistrationMaxRetries(): number {
    if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
      return this.stationInfo.registrationMaxRetries;
    }
    return -1;
  }

  private getPowerDivider(): number {
    let powerDivider = this.getNumberOfConnectors();
    if (this.stationInfo?.powerSharedByConnectors) {
      powerDivider = this.getNumberOfRunningTransactions();
    }
    return powerDivider;
  }

  private getMaximumPower(stationInfo?: ChargingStationInfo): number {
    const localStationInfo = stationInfo ?? this.stationInfo;
    return (localStationInfo['maxPower'] as number) ?? localStationInfo.maximumPower;
  }

  private getMaximumAmperage(stationInfo: ChargingStationInfo): number | undefined {
    const maximumPower = this.getMaximumPower(stationInfo);
    switch (this.getCurrentOutType(stationInfo)) {
      case CurrentType.AC:
        return ACElectricUtils.amperagePerPhaseFromPower(
          this.getNumberOfPhases(stationInfo),
          maximumPower / this.getNumberOfConnectors(),
          this.getVoltageOut(stationInfo)
        );
      case CurrentType.DC:
        return DCElectricUtils.amperage(maximumPower, this.getVoltageOut(stationInfo));
    }
  }

  private getAmperageLimitation(): number | undefined {
    if (
      this.stationInfo.amperageLimitationOcppKey &&
      ChargingStationConfigurationUtils.getConfigurationKey(
        this,
        this.stationInfo.amperageLimitationOcppKey
      )
    ) {
      return (
        Utils.convertToInt(
          ChargingStationConfigurationUtils.getConfigurationKey(
            this,
            this.stationInfo.amperageLimitationOcppKey
          ).value
        ) / ChargingStationUtils.getAmperageLimitationUnitDivider(this.stationInfo)
      );
    }
  }

  private getChargingProfilePowerLimit(connectorId: number): number | undefined {
    let limit: number, matchingChargingProfile: ChargingProfile;
    let chargingProfiles: ChargingProfile[] = [];
    // Get charging profiles for connector and sort by stack level
    chargingProfiles = this.getConnectorStatus(connectorId).chargingProfiles.sort(
      (a, b) => b.stackLevel - a.stackLevel
    );
    // Get profiles on connector 0
    if (this.getConnectorStatus(0).chargingProfiles) {
      chargingProfiles.push(
        ...this.getConnectorStatus(0).chargingProfiles.sort((a, b) => b.stackLevel - a.stackLevel)
      );
    }
    if (!Utils.isEmptyArray(chargingProfiles)) {
      const result = ChargingStationUtils.getLimitFromChargingProfiles(
        chargingProfiles,
        this.logPrefix()
      );
      if (!Utils.isNullOrUndefined(result)) {
        limit = result.limit;
        matchingChargingProfile = result.matchingChargingProfile;
        switch (this.getCurrentOutType()) {
          case CurrentType.AC:
            limit =
              matchingChargingProfile.chargingSchedule.chargingRateUnit ===
              ChargingRateUnitType.WATT
                ? limit
                : ACElectricUtils.powerTotal(this.getNumberOfPhases(), this.getVoltageOut(), limit);
            break;
          case CurrentType.DC:
            limit =
              matchingChargingProfile.chargingSchedule.chargingRateUnit ===
              ChargingRateUnitType.WATT
                ? limit
                : DCElectricUtils.power(this.getVoltageOut(), limit);
        }
        const connectorMaximumPower = this.getMaximumPower() / this.powerDivider;
        if (limit > connectorMaximumPower) {
          logger.error(
            `${this.logPrefix()} Charging profile id ${
              matchingChargingProfile.chargingProfileId
            } limit is greater than connector id ${connectorId} maximum, dump charging profiles' stack: %j`,
            this.getConnectorStatus(connectorId).chargingProfiles
          );
          limit = connectorMaximumPower;
        }
      }
    }
    return limit;
  }

  private async startMessageSequence(): Promise<void> {
    if (this.stationInfo?.autoRegister) {
      await this.ocppRequestService.requestHandler<
        BootNotificationRequest,
        BootNotificationResponse
      >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
        skipBufferingOnError: true,
      });
    }
    // Start WebSocket ping
    this.startWebSocketPing();
    // Start heartbeat
    this.startHeartbeat();
    // Initialize connectors status
    for (const connectorId of this.connectors.keys()) {
      let chargePointStatus: ChargePointStatus;
      if (connectorId === 0) {
        continue;
      } else if (
        !this.getConnectorStatus(connectorId)?.status &&
        this.getConnectorStatus(connectorId)?.bootStatus
      ) {
        // Set boot status in template at startup
        chargePointStatus = this.getConnectorStatus(connectorId).bootStatus;
      } else if (
        !this.getConnectorStatus(connectorId)?.status &&
        (this.isChargingStationAvailable() === false ||
          (this.isChargingStationAvailable() === true &&
            this.isConnectorAvailable(connectorId) === false))
      ) {
        chargePointStatus = ChargePointStatus.UNAVAILABLE;
      } else if (this.getConnectorStatus(connectorId)?.status) {
        // Set previous status at startup
        chargePointStatus = this.getConnectorStatus(connectorId).status;
      } else {
        // Set default status
        chargePointStatus = ChargePointStatus.AVAILABLE;
      }
      await this.ocppRequestService.requestHandler<
        StatusNotificationRequest,
        StatusNotificationResponse
      >(this, RequestCommand.STATUS_NOTIFICATION, {
        connectorId,
        status: chargePointStatus,
        errorCode: ChargePointErrorCode.NO_ERROR,
      });
      this.getConnectorStatus(connectorId).status = chargePointStatus;
    }
    // Start the ATG
    if (this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true) {
      this.startAutomaticTransactionGenerator();
    }
    this.wsConnectionRestarted === true && this.flushMessageBuffer();
  }

  private async stopMessageSequence(
    reason: StopTransactionReason = StopTransactionReason.NONE
  ): Promise<void> {
    // Stop WebSocket ping
    this.stopWebSocketPing();
    // Stop heartbeat
    this.stopHeartbeat();
    // Stop ongoing transactions
    if (this.automaticTransactionGenerator?.started === true) {
      this.stopAutomaticTransactionGenerator();
    } else {
      await this.stopRunningTransactions(reason);
    }
  }

  private startWebSocketPing(): void {
    const webSocketPingInterval: number = ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.WebSocketPingInterval
    )
      ? Utils.convertToInt(
          ChargingStationConfigurationUtils.getConfigurationKey(
            this,
            StandardParametersKey.WebSocketPingInterval
          ).value
        )
      : 0;
    if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
      this.webSocketPingSetInterval = setInterval(() => {
        if (this.isWebSocketConnectionOpened() === true) {
          this.wsConnection.ping((): void => {
            /* This is intentional */
          });
        }
      }, webSocketPingInterval * 1000);
      logger.info(
        this.logPrefix() +
          ' WebSocket ping started every ' +
          Utils.formatDurationSeconds(webSocketPingInterval)
      );
    } else if (this.webSocketPingSetInterval) {
      logger.info(
        this.logPrefix() +
          ' WebSocket ping every ' +
          Utils.formatDurationSeconds(webSocketPingInterval) +
          ' already started'
      );
    } else {
      logger.error(
        `${this.logPrefix()} WebSocket ping interval set to ${
          webSocketPingInterval
            ? Utils.formatDurationSeconds(webSocketPingInterval)
            : webSocketPingInterval
        }, not starting the WebSocket ping`
      );
    }
  }

  private stopWebSocketPing(): void {
    if (this.webSocketPingSetInterval) {
      clearInterval(this.webSocketPingSetInterval);
    }
  }

  private getConfiguredSupervisionUrl(): URL {
    const supervisionUrls = Utils.cloneObject<string | string[]>(
      this.stationInfo.supervisionUrls ?? Configuration.getSupervisionUrls()
    );
    if (!Utils.isEmptyArray(supervisionUrls)) {
      switch (Configuration.getSupervisionUrlDistribution()) {
        case SupervisionUrlDistribution.ROUND_ROBIN:
          // FIXME
          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
          break;
        case SupervisionUrlDistribution.RANDOM:
          this.configuredSupervisionUrlIndex = Math.floor(
            Utils.secureRandom() * supervisionUrls.length
          );
          break;
        case SupervisionUrlDistribution.CHARGING_STATION_AFFINITY:
          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
          break;
        default:
          logger.error(
            `${this.logPrefix()} Unknown supervision url distribution '${Configuration.getSupervisionUrlDistribution()}' from values '${SupervisionUrlDistribution.toString()}', defaulting to ${
              SupervisionUrlDistribution.CHARGING_STATION_AFFINITY
            }`
          );
          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
          break;
      }
      return new URL(supervisionUrls[this.configuredSupervisionUrlIndex]);
    }
    return new URL(supervisionUrls as string);
  }

  private getHeartbeatInterval(): number {
    const HeartbeatInterval = ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.HeartbeatInterval
    );
    if (HeartbeatInterval) {
      return Utils.convertToInt(HeartbeatInterval.value) * 1000;
    }
    const HeartBeatInterval = ChargingStationConfigurationUtils.getConfigurationKey(
      this,
      StandardParametersKey.HeartBeatInterval
    );
    if (HeartBeatInterval) {
      return Utils.convertToInt(HeartBeatInterval.value) * 1000;
    }
    !this.stationInfo?.autoRegister &&
      logger.warn(
        `${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${
          Constants.DEFAULT_HEARTBEAT_INTERVAL
        }`
      );
    return Constants.DEFAULT_HEARTBEAT_INTERVAL;
  }

  private stopHeartbeat(): void {
    if (this.heartbeatSetInterval) {
      clearInterval(this.heartbeatSetInterval);
    }
  }

  private terminateWSConnection(): void {
    if (this.isWebSocketConnectionOpened() === true) {
      this.wsConnection.terminate();
      this.wsConnection = null;
    }
  }

  private stopMeterValues(connectorId: number) {
    if (this.getConnectorStatus(connectorId)?.transactionSetInterval) {
      clearInterval(this.getConnectorStatus(connectorId).transactionSetInterval);
    }
  }

  private getReconnectExponentialDelay(): boolean {
    return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay)
      ? this.stationInfo.reconnectExponentialDelay
      : false;
  }

  private async reconnect(): Promise<void> {
    // Stop WebSocket ping
    this.stopWebSocketPing();
    // Stop heartbeat
    this.stopHeartbeat();
    // Stop the ATG if needed
    if (this.automaticTransactionGenerator?.configuration?.stopOnConnectionFailure === true) {
      this.stopAutomaticTransactionGenerator();
    }
    if (
      this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() ||
      this.getAutoReconnectMaxRetries() === -1
    ) {
      this.autoReconnectRetryCount++;
      const reconnectDelay = this.getReconnectExponentialDelay()
        ? Utils.exponentialDelay(this.autoReconnectRetryCount)
        : this.getConnectionTimeout() * 1000;
      const reconnectDelayWithdraw = 1000;
      const reconnectTimeout =
        reconnectDelay && reconnectDelay - reconnectDelayWithdraw > 0
          ? reconnectDelay - reconnectDelayWithdraw
          : 0;
      logger.error(
        `${this.logPrefix()} WebSocket: connection retry in ${Utils.roundTo(
          reconnectDelay,
          2
        )}ms, timeout ${reconnectTimeout}ms`
      );
      await Utils.sleep(reconnectDelay);
      logger.error(
        this.logPrefix() +
          ' WebSocket: reconnecting try #' +
          this.autoReconnectRetryCount.toString()
      );
      this.openWSConnection(
        { ...(this.stationInfo?.wsOptions ?? {}), handshakeTimeout: reconnectTimeout },
        { closeOpened: true }
      );
      this.wsConnectionRestarted = true;
    } else if (this.getAutoReconnectMaxRetries() !== -1) {
      logger.error(
        `${this.logPrefix()} WebSocket reconnect failure: maximum retries reached (${
          this.autoReconnectRetryCount
        }) or retry disabled (${this.getAutoReconnectMaxRetries()})`
      );
    }
  }

  private getAutomaticTransactionGeneratorConfigurationFromTemplate(): AutomaticTransactionGeneratorConfiguration | null {
    return this.getTemplateFromFile()?.AutomaticTransactionGenerator ?? null;
  }

  private initializeConnectorStatus(connectorId: number): void {
    this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
    this.getConnectorStatus(connectorId).idTagAuthorized = false;
    this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
    this.getConnectorStatus(connectorId).transactionStarted = false;
    this.getConnectorStatus(connectorId).energyActiveImportRegisterValue = 0;
    this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
  }
}