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

// Partial Copyright Jerome Benoit. 2021-2024. All Rights Reserved.

import { createHash } from 'node:crypto'
import { EventEmitter } from 'node:events'
import { type FSWatcher, existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs'
import { dirname, join } from 'node:path'
import { URL } from 'node:url'
import { parentPort } from 'node:worker_threads'

import { millisecondsToSeconds, secondsToMilliseconds } from 'date-fns'
import merge from 'just-merge'
import { type RawData, WebSocket } from 'ws'

import { AutomaticTransactionGenerator } from './AutomaticTransactionGenerator.js'
import { ChargingStationWorkerBroadcastChannel } from './broadcast-channel/ChargingStationWorkerBroadcastChannel.js'
import {
  addConfigurationKey,
  deleteConfigurationKey,
  getConfigurationKey,
  setConfigurationKeyValue
} from './ConfigurationKeyUtils.js'
import {
  buildConnectorsMap,
  checkChargingStation,
  checkConfiguration,
  checkConnectorsConfiguration,
  checkStationInfoConnectorStatus,
  checkTemplate,
  createBootNotificationRequest,
  createSerialNumber,
  getAmperageLimitationUnitDivider,
  getBootConnectorStatus,
  getChargingStationConnectorChargingProfilesPowerLimit,
  getChargingStationId,
  getDefaultVoltageOut,
  getHashId,
  getIdTagsFile,
  getMaxNumberOfEvses,
  getNumberOfReservableConnectors,
  getPhaseRotationValue,
  hasFeatureProfile,
  hasReservationExpired,
  initializeConnectorsMapStatus,
  propagateSerialNumber,
  stationTemplateToStationInfo,
  warnTemplateKeysDeprecation
} from './Helpers.js'
import { IdTagsCache } from './IdTagsCache.js'
import {
  OCPP16IncomingRequestService,
  OCPP16RequestService,
  OCPP16ResponseService,
  OCPP20IncomingRequestService,
  OCPP20RequestService,
  OCPP20ResponseService,
  type OCPPIncomingRequestService,
  type OCPPRequestService,
  buildMeterValue,
  buildTransactionEndMeterValue,
  getMessageTypeString,
  sendAndSetConnectorStatus
} from './ocpp/index.js'
import { SharedLRUCache } from './SharedLRUCache.js'
import { BaseError, OCPPError } from '../exception/index.js'
import { PerformanceStatistics } from '../performance/index.js'
import {
  type AutomaticTransactionGeneratorConfiguration,
  AvailabilityType,
  type BootNotificationRequest,
  type BootNotificationResponse,
  type CachedRequest,
  type ChargingStationConfiguration,
  ChargingStationEvents,
  type ChargingStationInfo,
  type ChargingStationOcppConfiguration,
  type ChargingStationTemplate,
  type ConnectorStatus,
  ConnectorStatusEnum,
  CurrentType,
  type ErrorCallback,
  type ErrorResponse,
  ErrorType,
  type EvseStatus,
  type EvseStatusConfiguration,
  FileType,
  FirmwareStatus,
  type FirmwareStatusNotificationRequest,
  type FirmwareStatusNotificationResponse,
  type FirmwareUpgrade,
  type HeartbeatRequest,
  type HeartbeatResponse,
  type IncomingRequest,
  type IncomingRequestCommand,
  MessageType,
  MeterValueMeasurand,
  type MeterValuesRequest,
  type MeterValuesResponse,
  OCPPVersion,
  type OutgoingRequest,
  PowerUnits,
  RegistrationStatusEnumType,
  RequestCommand,
  type Reservation,
  type ReservationKey,
  ReservationTerminationReason,
  type Response,
  StandardParametersKey,
  type Status,
  type StopTransactionReason,
  type StopTransactionRequest,
  type StopTransactionResponse,
  SupervisionUrlDistribution,
  SupportedFeatureProfiles,
  type Voltage,
  type WSError,
  WebSocketCloseEventStatusCode,
  type WsOptions
} from '../types/index.js'
import {
  ACElectricUtils,
  AsyncLock,
  AsyncLockType,
  Configuration,
  Constants,
  DCElectricUtils,
  buildChargingStationAutomaticTransactionGeneratorConfiguration,
  buildConnectorsStatus,
  buildEvsesStatus,
  buildStartedMessage,
  buildStoppedMessage,
  buildUpdatedMessage,
  clone,
  convertToBoolean,
  convertToDate,
  convertToInt,
  exponentialDelay,
  formatDurationMilliSeconds,
  formatDurationSeconds,
  getRandomInteger,
  getWebSocketCloseEventStatusString,
  handleFileException,
  isNotEmptyArray,
  isNotEmptyString,
  logPrefix,
  logger,
  min,
  once,
  roundTo,
  secureRandom,
  sleep,
  watchJsonFile
} from '../utils/index.js'

export class ChargingStation extends EventEmitter {
  public readonly index: number
  public readonly templateFile: string
  public stationInfo?: ChargingStationInfo
  public started: boolean
  public starting: boolean
  public idTagsCache: IdTagsCache
  public automaticTransactionGenerator!: AutomaticTransactionGenerator | undefined
  public ocppConfiguration!: ChargingStationOcppConfiguration | undefined
  public wsConnection: WebSocket | null
  public readonly connectors: Map<number, ConnectorStatus>
  public readonly evses: Map<number, EvseStatus>
  public readonly requests: Map<string, CachedRequest>
  public performanceStatistics!: PerformanceStatistics | undefined
  public heartbeatSetInterval?: NodeJS.Timeout
  public ocppRequestService!: OCPPRequestService
  public bootNotificationRequest?: BootNotificationRequest
  public bootNotificationResponse?: BootNotificationResponse
  public powerDivider?: number
  private stopping: boolean
  private configurationFile!: string
  private configurationFileHash!: string
  private connectorsConfigurationHash!: string
  private evsesConfigurationHash!: string
  private automaticTransactionGeneratorConfiguration?: AutomaticTransactionGeneratorConfiguration
  private ocppIncomingRequestService!: OCPPIncomingRequestService
  private readonly messageBuffer: Set<string>
  private configuredSupervisionUrl!: URL
  private wsConnectionRetried: boolean
  private wsConnectionRetryCount: number
  private templateFileWatcher!: FSWatcher | undefined
  private templateFileHash!: string
  private readonly sharedLRUCache: SharedLRUCache
  private wsPingSetInterval?: NodeJS.Timeout
  private readonly chargingStationWorkerBroadcastChannel: ChargingStationWorkerBroadcastChannel
  private flushMessageBufferSetInterval?: NodeJS.Timeout

  constructor (index: number, templateFile: string) {
    super()
    this.started = false
    this.starting = false
    this.stopping = false
    this.wsConnection = null
    this.wsConnectionRetried = false
    this.wsConnectionRetryCount = 0
    this.index = index
    this.templateFile = templateFile
    this.connectors = new Map<number, ConnectorStatus>()
    this.evses = new Map<number, EvseStatus>()
    this.requests = new Map<string, CachedRequest>()
    this.messageBuffer = new Set<string>()
    this.sharedLRUCache = SharedLRUCache.getInstance()
    this.idTagsCache = IdTagsCache.getInstance()
    this.chargingStationWorkerBroadcastChannel = new ChargingStationWorkerBroadcastChannel(this)

    this.on(ChargingStationEvents.started, () => {
      parentPort?.postMessage(buildStartedMessage(this))
    })
    this.on(ChargingStationEvents.stopped, () => {
      parentPort?.postMessage(buildStoppedMessage(this))
    })
    this.on(ChargingStationEvents.updated, () => {
      parentPort?.postMessage(buildUpdatedMessage(this))
    })
    this.on(ChargingStationEvents.accepted, () => {
      this.startMessageSequence(
        this.wsConnectionRetried
          ? true
          : this.getAutomaticTransactionGeneratorConfiguration()?.stopAbsoluteDuration
      ).catch(error => {
        logger.error(`${this.logPrefix()} Error while starting the message sequence:`, error)
      })
      this.wsConnectionRetried = false
    })
    this.on(ChargingStationEvents.disconnected, () => {
      try {
        this.internalStopMessageSequence()
      } catch (error) {
        logger.error(
          `${this.logPrefix()} Error while stopping the internal message sequence:`,
          error
        )
      }
    })

    this.initialize()
  }

  public get hasEvses (): boolean {
    return this.connectors.size === 0 && this.evses.size > 0
  }

  private get wsConnectionUrl (): URL {
    return new URL(
      `${
        this.stationInfo?.supervisionUrlOcppConfiguration === true &&
        isNotEmptyString(this.stationInfo.supervisionUrlOcppKey) &&
        isNotEmptyString(getConfigurationKey(this, this.stationInfo.supervisionUrlOcppKey)?.value)
          ? getConfigurationKey(this, this.stationInfo.supervisionUrlOcppKey)?.value
          : this.configuredSupervisionUrl.href
      }/${this.stationInfo?.chargingStationId}`
    )
  }

  public logPrefix = (): string => {
    if (
      this instanceof ChargingStation &&
      this.stationInfo != null &&
      isNotEmptyString(this.stationInfo.chargingStationId)
    ) {
      return logPrefix(` ${this.stationInfo.chargingStationId} |`)
    }
    let stationTemplate: ChargingStationTemplate | undefined
    try {
      stationTemplate = JSON.parse(
        readFileSync(this.templateFile, 'utf8')
      ) as ChargingStationTemplate
    } catch {
      stationTemplate = undefined
    }
    return logPrefix(` ${getChargingStationId(this.index, stationTemplate)} |`)
  }

  public hasIdTags (): boolean {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    return isNotEmptyArray(this.idTagsCache.getIdTags(getIdTagsFile(this.stationInfo!)!))
  }

  public getNumberOfPhases (stationInfo?: ChargingStationInfo): number {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const localStationInfo = stationInfo ?? this.stationInfo!
    switch (this.getCurrentOutType(stationInfo)) {
      case CurrentType.AC:
        return localStationInfo.numberOfPhases ?? 3
      case CurrentType.DC:
        return 0
    }
  }

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

  public inUnknownState (): boolean {
    return this.bootNotificationResponse?.status == null
  }

  public inPendingState (): boolean {
    return this.bootNotificationResponse?.status === RegistrationStatusEnumType.PENDING
  }

  public inAcceptedState (): boolean {
    return this.bootNotificationResponse?.status === RegistrationStatusEnumType.ACCEPTED
  }

  public inRejectedState (): boolean {
    return this.bootNotificationResponse?.status === RegistrationStatusEnumType.REJECTED
  }

  public isRegistered (): boolean {
    return !this.inUnknownState() && (this.inAcceptedState() || this.inPendingState())
  }

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

  public hasConnector (connectorId: number): boolean {
    if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        if (evseStatus.connectors.has(connectorId)) {
          return true
        }
      }
      return false
    }
    return this.connectors.has(connectorId)
  }

  public isConnectorAvailable (connectorId: number): boolean {
    return (
      connectorId > 0 &&
      this.getConnectorStatus(connectorId)?.availability === AvailabilityType.Operative
    )
  }

  public getNumberOfConnectors (): number {
    if (this.hasEvses) {
      let numberOfConnectors = 0
      for (const [evseId, evseStatus] of this.evses) {
        if (evseId > 0) {
          numberOfConnectors += evseStatus.connectors.size
        }
      }
      return numberOfConnectors
    }
    return this.connectors.has(0) ? this.connectors.size - 1 : this.connectors.size
  }

  public getNumberOfEvses (): number {
    return this.evses.has(0) ? this.evses.size - 1 : this.evses.size
  }

  public getConnectorStatus (connectorId: number): ConnectorStatus | undefined {
    if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        if (evseStatus.connectors.has(connectorId)) {
          return evseStatus.connectors.get(connectorId)
        }
      }
      return undefined
    }
    return this.connectors.get(connectorId)
  }

  public getConnectorMaximumAvailablePower (connectorId: number): number {
    let connectorAmperageLimitationPowerLimit: number | undefined
    const amperageLimitation = this.getAmperageLimitation()
    if (
      amperageLimitation != null &&
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      amperageLimitation < this.stationInfo!.maximumAmperage!
    ) {
      connectorAmperageLimitationPowerLimit =
        (this.stationInfo?.currentOutType === CurrentType.AC
          ? ACElectricUtils.powerTotal(
            this.getNumberOfPhases(),
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            this.stationInfo.voltageOut!,
            amperageLimitation *
                (this.hasEvses ? this.getNumberOfEvses() : this.getNumberOfConnectors())
          )
          : // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          DCElectricUtils.power(this.stationInfo!.voltageOut!, amperageLimitation)) /
        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
        this.powerDivider!
    }
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const connectorMaximumPower = this.stationInfo!.maximumPower! / this.powerDivider!
    const connectorChargingProfilesPowerLimit =
      getChargingStationConnectorChargingProfilesPowerLimit(this, connectorId)
    return min(
      isNaN(connectorMaximumPower) ? Infinity : connectorMaximumPower,
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      isNaN(connectorAmperageLimitationPowerLimit!)
        ? Infinity
        : // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
        connectorAmperageLimitationPowerLimit!,
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      isNaN(connectorChargingProfilesPowerLimit!) ? Infinity : connectorChargingProfilesPowerLimit!
    )
  }

  public getTransactionIdTag (transactionId: number): string | undefined {
    if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        for (const connectorStatus of evseStatus.connectors.values()) {
          if (connectorStatus.transactionId === transactionId) {
            return connectorStatus.transactionIdTag
          }
        }
      }
    } else {
      for (const connectorId of this.connectors.keys()) {
        if (this.getConnectorStatus(connectorId)?.transactionId === transactionId) {
          return this.getConnectorStatus(connectorId)?.transactionIdTag
        }
      }
    }
  }

  public getNumberOfRunningTransactions (): number {
    let numberOfRunningTransactions = 0
    if (this.hasEvses) {
      for (const [evseId, evseStatus] of this.evses) {
        if (evseId === 0) {
          continue
        }
        for (const connectorStatus of evseStatus.connectors.values()) {
          if (connectorStatus.transactionStarted === true) {
            ++numberOfRunningTransactions
          }
        }
      }
    } else {
      for (const connectorId of this.connectors.keys()) {
        if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
          ++numberOfRunningTransactions
        }
      }
    }
    return numberOfRunningTransactions
  }

  public getConnectorIdByTransactionId (transactionId: number | undefined): number | undefined {
    if (transactionId == null) {
      return undefined
    } else if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        for (const [connectorId, connectorStatus] of evseStatus.connectors) {
          if (connectorStatus.transactionId === transactionId) {
            return connectorId
          }
        }
      }
    } else {
      for (const connectorId of this.connectors.keys()) {
        if (this.getConnectorStatus(connectorId)?.transactionId === transactionId) {
          return connectorId
        }
      }
    }
  }

  public getEnergyActiveImportRegisterByTransactionId (
    transactionId: number | undefined,
    rounded = false
  ): number {
    return this.getEnergyActiveImportRegister(
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      this.getConnectorStatus(this.getConnectorIdByTransactionId(transactionId)!),
      rounded
    )
  }

  public getEnergyActiveImportRegisterByConnectorId (connectorId: number, rounded = false): number {
    return this.getEnergyActiveImportRegister(this.getConnectorStatus(connectorId), rounded)
  }

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

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

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

  public setSupervisionUrl (url: string): void {
    if (
      this.stationInfo?.supervisionUrlOcppConfiguration === true &&
      isNotEmptyString(this.stationInfo.supervisionUrlOcppKey)
    ) {
      setConfigurationKeyValue(this, this.stationInfo.supervisionUrlOcppKey, url)
    } else {
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      this.stationInfo!.supervisionUrls = url
      this.saveStationInfo()
      this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl()
    }
  }

  public startHeartbeat (): void {
    if (this.getHeartbeatInterval() > 0 && this.heartbeatSetInterval == null) {
      this.heartbeatSetInterval = setInterval(() => {
        this.ocppRequestService
          .requestHandler<HeartbeatRequest, HeartbeatResponse>(this, RequestCommand.HEARTBEAT)
          .catch(error => {
            logger.error(
              `${this.logPrefix()} Error while sending '${RequestCommand.HEARTBEAT}':`,
              error
            )
          })
      }, this.getHeartbeatInterval())
      logger.info(
        `${this.logPrefix()} Heartbeat started every ${formatDurationMilliSeconds(
          this.getHeartbeatInterval()
        )}`
      )
    } else if (this.heartbeatSetInterval != null) {
      logger.info(
        `${this.logPrefix()} Heartbeat already started every ${formatDurationMilliSeconds(
          this.getHeartbeatInterval()
        )}`
      )
    } else {
      logger.error(
        `${this.logPrefix()} Heartbeat interval set to ${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 ${connectorId}`)
      return
    }
    const connectorStatus = this.getConnectorStatus(connectorId)
    if (connectorStatus == null) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on non existing connector id
          ${connectorId}`
      )
      return
    }
    if (connectorStatus.transactionStarted === false) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on connector id ${connectorId} with no transaction started`
      )
      return
    } else if (
      connectorStatus.transactionStarted === true &&
      connectorStatus.transactionId == null
    ) {
      logger.error(
        `${this.logPrefix()} Trying to start MeterValues on connector id ${connectorId} with no transaction id`
      )
      return
    }
    if (interval > 0) {
      connectorStatus.transactionSetInterval = setInterval(() => {
        const meterValue = buildMeterValue(
          this,
          connectorId,
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          connectorStatus.transactionId!,
          interval
        )
        this.ocppRequestService
          .requestHandler<MeterValuesRequest, MeterValuesResponse>(
          this,
          RequestCommand.METER_VALUES,
          {
            connectorId,
            transactionId: connectorStatus.transactionId,
            meterValue: [meterValue]
          }
        )
          .catch(error => {
            logger.error(
              `${this.logPrefix()} Error while sending '${RequestCommand.METER_VALUES}':`,
              error
            )
          })
      }, interval)
    } else {
      logger.error(
        `${this.logPrefix()} Charging station ${
          StandardParametersKey.MeterValueSampleInterval
        } configuration set to ${interval}, not sending MeterValues`
      )
    }
  }

  public stopMeterValues (connectorId: number): void {
    const connectorStatus = this.getConnectorStatus(connectorId)
    if (connectorStatus?.transactionSetInterval != null) {
      clearInterval(connectorStatus.transactionSetInterval)
    }
  }

  public start (): void {
    if (!this.started) {
      if (!this.starting) {
        this.starting = true
        if (this.stationInfo?.enableStatistics === true) {
          this.performanceStatistics?.start()
        }
        this.openWSConnection()
        // Monitor charging station template file
        this.templateFileWatcher = watchJsonFile(
          this.templateFile,
          FileType.ChargingStationTemplate,
          this.logPrefix(),
          undefined,
          (event, filename): void => {
            if (isNotEmptyString(filename) && event === 'change') {
              try {
                logger.debug(
                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} ${
                    this.templateFile
                  } file have changed, reload`
                )
                this.sharedLRUCache.deleteChargingStationTemplate(this.templateFileHash)
                // Initialize
                this.initialize()
                // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
                this.idTagsCache.deleteIdTags(getIdTagsFile(this.stationInfo!)!)
                // Restart the ATG
                const ATGStarted = this.automaticTransactionGenerator?.started
                if (ATGStarted === true) {
                  this.stopAutomaticTransactionGenerator()
                }
                delete this.automaticTransactionGeneratorConfiguration
                if (
                  this.getAutomaticTransactionGeneratorConfiguration()?.enable === true &&
                  ATGStarted === true
                ) {
                  this.startAutomaticTransactionGenerator(undefined, true)
                }
                if (this.stationInfo?.enableStatistics === true) {
                  this.performanceStatistics?.restart()
                } else {
                  this.performanceStatistics?.stop()
                }
                // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
              } catch (error) {
                logger.error(
                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} file monitoring error:`,
                  error
                )
              }
            }
          }
        )
        this.started = true
        this.emit(ChargingStationEvents.started)
        this.starting = false
      } else {
        logger.warn(`${this.logPrefix()} Charging station is already starting...`)
      }
    } else {
      logger.warn(`${this.logPrefix()} Charging station is already started...`)
    }
  }

  public async stop (reason?: StopTransactionReason, stopTransactions?: boolean): Promise<void> {
    if (this.started) {
      if (!this.stopping) {
        this.stopping = true
        await this.stopMessageSequence(reason, stopTransactions)
        this.closeWSConnection()
        if (this.stationInfo?.enableStatistics === true) {
          this.performanceStatistics?.stop()
        }
        this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash)
        this.templateFileWatcher?.close()
        this.sharedLRUCache.deleteChargingStationTemplate(this.templateFileHash)
        delete this.bootNotificationResponse
        this.started = false
        this.saveConfiguration()
        this.emit(ChargingStationEvents.stopped)
        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)
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    await sleep(this.stationInfo!.resetTime!)
    this.initialize()
    this.start()
  }

  public saveOcppConfiguration (): void {
    if (this.stationInfo?.ocppPersistentConfiguration === true) {
      this.saveConfiguration()
    }
  }

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

  public openWSConnection (
    options?: WsOptions,
    params?: { closeOpened?: boolean, terminateOpened?: boolean }
  ): void {
    options = {
      handshakeTimeout: secondsToMilliseconds(this.getConnectionTimeout()),
      ...this.stationInfo?.wsOptions,
      ...options
    }
    params = { ...{ closeOpened: false, terminateOpened: false }, ...params }
    if (!checkChargingStation(this, this.logPrefix())) {
      return
    }
    if (this.stationInfo?.supervisionUser != null && this.stationInfo.supervisionPassword != null) {
      options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`
    }
    if (params.closeOpened === true) {
      this.closeWSConnection()
    }
    if (params.terminateOpened === true) {
      this.terminateWSConnection()
    }

    if (this.isWebSocketConnectionOpened()) {
      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,
      `ocpp${this.stationInfo?.ocppVersion}`,
      options
    )

    // Handle WebSocket message
    this.wsConnection.on('message', data => {
      this.onMessage(data).catch(Constants.EMPTY_FUNCTION)
    })
    // Handle WebSocket error
    this.wsConnection.on('error', this.onError.bind(this))
    // Handle WebSocket close
    this.wsConnection.on('close', this.onClose.bind(this))
    // Handle WebSocket open
    this.wsConnection.on('open', () => {
      this.onOpen().catch(error =>
        logger.error(`${this.logPrefix()} Error while opening WebSocket connection:`, error)
      )
    })
    // Handle WebSocket ping
    this.wsConnection.on('ping', this.onPing.bind(this))
    // Handle WebSocket pong
    this.wsConnection.on('pong', this.onPong.bind(this))
  }

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

  public getAutomaticTransactionGeneratorConfiguration ():
  | AutomaticTransactionGeneratorConfiguration
  | undefined {
    if (this.automaticTransactionGeneratorConfiguration == null) {
      let automaticTransactionGeneratorConfiguration:
      | AutomaticTransactionGeneratorConfiguration
      | undefined
      const stationTemplate = this.getTemplateFromFile()
      const stationConfiguration = this.getConfigurationFromFile()
      if (
        this.stationInfo?.automaticTransactionGeneratorPersistentConfiguration === true &&
        stationConfiguration?.stationInfo?.templateHash === stationTemplate?.templateHash &&
        stationConfiguration?.automaticTransactionGenerator != null
      ) {
        automaticTransactionGeneratorConfiguration =
          stationConfiguration.automaticTransactionGenerator
      } else {
        automaticTransactionGeneratorConfiguration = stationTemplate?.AutomaticTransactionGenerator
      }
      this.automaticTransactionGeneratorConfiguration = {
        ...Constants.DEFAULT_ATG_CONFIGURATION,
        ...automaticTransactionGeneratorConfiguration
      }
    }
    return this.automaticTransactionGeneratorConfiguration
  }

  public getAutomaticTransactionGeneratorStatuses (): Status[] | undefined {
    return this.getConfigurationFromFile()?.automaticTransactionGeneratorStatuses
  }

  public startAutomaticTransactionGenerator (
    connectorIds?: number[],
    stopAbsoluteDuration?: boolean
  ): void {
    this.automaticTransactionGenerator = AutomaticTransactionGenerator.getInstance(this)
    if (isNotEmptyArray(connectorIds)) {
      for (const connectorId of connectorIds) {
        this.automaticTransactionGenerator?.startConnector(connectorId, stopAbsoluteDuration)
      }
    } else {
      this.automaticTransactionGenerator?.start(stopAbsoluteDuration)
    }
    this.saveAutomaticTransactionGeneratorConfiguration()
    this.emit(ChargingStationEvents.updated)
  }

  public stopAutomaticTransactionGenerator (connectorIds?: number[]): void {
    if (isNotEmptyArray(connectorIds)) {
      for (const connectorId of connectorIds) {
        this.automaticTransactionGenerator?.stopConnector(connectorId)
      }
    } else {
      this.automaticTransactionGenerator?.stop()
    }
    this.saveAutomaticTransactionGeneratorConfiguration()
    this.emit(ChargingStationEvents.updated)
  }

  public async stopTransactionOnConnector (
    connectorId: number,
    reason?: StopTransactionReason
  ): Promise<StopTransactionResponse> {
    const transactionId = this.getConnectorStatus(connectorId)?.transactionId
    if (
      this.stationInfo?.beginEndMeterValues === true &&
      this.stationInfo.ocppStrictCompliance === true &&
      this.stationInfo.outOfOrderEndMeterValues === false
    ) {
      const transactionEndMeterValue = buildTransactionEndMeterValue(
        this,
        connectorId,
        this.getEnergyActiveImportRegisterByTransactionId(transactionId)
      )
      await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
        this,
        RequestCommand.METER_VALUES,
        {
          connectorId,
          transactionId,
          meterValue: [transactionEndMeterValue]
        }
      )
    }
    return await this.ocppRequestService.requestHandler<
    StopTransactionRequest,
    StopTransactionResponse
    >(this, RequestCommand.STOP_TRANSACTION, {
      transactionId,
      meterStop: this.getEnergyActiveImportRegisterByTransactionId(transactionId, true),
      ...(reason != null && { reason })
    })
  }

  public getReserveConnectorZeroSupported (): boolean {
    return convertToBoolean(
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      getConfigurationKey(this, StandardParametersKey.ReserveConnectorZeroSupported)!.value
    )
  }

  public async addReservation (reservation: Reservation): Promise<void> {
    const reservationFound = this.getReservationBy('reservationId', reservation.reservationId)
    if (reservationFound != null) {
      await this.removeReservation(reservationFound, ReservationTerminationReason.REPLACE_EXISTING)
    }
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    this.getConnectorStatus(reservation.connectorId)!.reservation = reservation
    await sendAndSetConnectorStatus(
      this,
      reservation.connectorId,
      ConnectorStatusEnum.Reserved,
      undefined,
      { send: reservation.connectorId !== 0 }
    )
  }

  public async removeReservation (
    reservation: Reservation,
    reason: ReservationTerminationReason
  ): Promise<void> {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const connector = this.getConnectorStatus(reservation.connectorId)!
    switch (reason) {
      case ReservationTerminationReason.CONNECTOR_STATE_CHANGED:
      case ReservationTerminationReason.TRANSACTION_STARTED:
        delete connector.reservation
        break
      case ReservationTerminationReason.RESERVATION_CANCELED:
      case ReservationTerminationReason.REPLACE_EXISTING:
      case ReservationTerminationReason.EXPIRED:
        await sendAndSetConnectorStatus(
          this,
          reservation.connectorId,
          ConnectorStatusEnum.Available,
          undefined,
          { send: reservation.connectorId !== 0 }
        )
        delete connector.reservation
        break
      default:
        // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
        throw new BaseError(`Unknown reservation termination reason '${reason}'`)
    }
  }

  public getReservationBy (
    filterKey: ReservationKey,
    value: number | string
  ): Reservation | undefined {
    if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        for (const connectorStatus of evseStatus.connectors.values()) {
          if (connectorStatus.reservation?.[filterKey] === value) {
            return connectorStatus.reservation
          }
        }
      }
    } else {
      for (const connectorStatus of this.connectors.values()) {
        if (connectorStatus.reservation?.[filterKey] === value) {
          return connectorStatus.reservation
        }
      }
    }
  }

  public isConnectorReservable (
    reservationId: number,
    idTag?: string,
    connectorId?: number
  ): boolean {
    const reservation = this.getReservationBy('reservationId', reservationId)
    const reservationExists = reservation !== undefined && !hasReservationExpired(reservation)
    if (arguments.length === 1) {
      return !reservationExists
    } else if (arguments.length > 1) {
      const userReservation =
        idTag !== undefined ? this.getReservationBy('idTag', idTag) : undefined
      const userReservationExists =
        userReservation !== undefined && !hasReservationExpired(userReservation)
      const notConnectorZero = connectorId === undefined ? true : connectorId > 0
      const freeConnectorsAvailable = this.getNumberOfReservableConnectors() > 0
      return (
        !reservationExists && !userReservationExists && notConnectorZero && freeConnectorsAvailable
      )
    }
    return false
  }

  private setIntervalFlushMessageBuffer (): void {
    if (this.flushMessageBufferSetInterval == null) {
      this.flushMessageBufferSetInterval = setInterval(() => {
        if (this.isWebSocketConnectionOpened() && this.inAcceptedState()) {
          this.flushMessageBuffer()
        }
        if (this.messageBuffer.size === 0) {
          this.clearIntervalFlushMessageBuffer()
        }
      }, Constants.DEFAULT_MESSAGE_BUFFER_FLUSH_INTERVAL)
    }
  }

  private clearIntervalFlushMessageBuffer (): void {
    if (this.flushMessageBufferSetInterval != null) {
      clearInterval(this.flushMessageBufferSetInterval)
      delete this.flushMessageBufferSetInterval
    }
  }

  private getNumberOfReservableConnectors (): number {
    let numberOfReservableConnectors = 0
    if (this.hasEvses) {
      for (const evseStatus of this.evses.values()) {
        numberOfReservableConnectors += getNumberOfReservableConnectors(evseStatus.connectors)
      }
    } else {
      numberOfReservableConnectors = getNumberOfReservableConnectors(this.connectors)
    }
    return numberOfReservableConnectors - this.getNumberOfReservationsOnConnectorZero()
  }

  private getNumberOfReservationsOnConnectorZero (): number {
    if (
      (this.hasEvses && this.evses.get(0)?.connectors.get(0)?.reservation != null) ||
      (!this.hasEvses && this.connectors.get(0)?.reservation != null)
    ) {
      return 1
    }
    return 0
  }

  private flushMessageBuffer (): void {
    if (this.messageBuffer.size > 0) {
      for (const message of this.messageBuffer.values()) {
        let beginId: string | undefined
        let commandName: RequestCommand | undefined
        const [messageType] = JSON.parse(message) as OutgoingRequest | Response | ErrorResponse
        const isRequest = messageType === MessageType.CALL_MESSAGE
        if (isRequest) {
          [, , commandName] = JSON.parse(message) as OutgoingRequest
          beginId = PerformanceStatistics.beginMeasure(commandName)
        }
        this.wsConnection?.send(message, (error?: Error) => {
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          isRequest && PerformanceStatistics.endMeasure(commandName!, beginId!)
          if (error == null) {
            logger.debug(
              `${this.logPrefix()} >> Buffered ${getMessageTypeString(
                messageType
              )} OCPP message sent '${JSON.stringify(message)}'`
            )
            this.messageBuffer.delete(message)
          } else {
            logger.debug(
              `${this.logPrefix()} >> Buffered ${getMessageTypeString(
                messageType
              )} OCPP message '${JSON.stringify(message)}' send failed:`,
              error
            )
          }
        })
      }
    }
  }

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

  private getStationInfoFromTemplate (): ChargingStationInfo {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const stationTemplate = this.getTemplateFromFile()!
    checkTemplate(stationTemplate, this.logPrefix(), this.templateFile)
    const warnTemplateKeysDeprecationOnce = once(warnTemplateKeysDeprecation, this)
    warnTemplateKeysDeprecationOnce(stationTemplate, this.logPrefix(), this.templateFile)
    if (stationTemplate.Connectors != null) {
      checkConnectorsConfiguration(stationTemplate, this.logPrefix(), this.templateFile)
    }
    const stationInfo = stationTemplateToStationInfo(stationTemplate)
    stationInfo.hashId = getHashId(this.index, stationTemplate)
    stationInfo.chargingStationId = getChargingStationId(this.index, stationTemplate)
    stationInfo.ocppVersion = stationTemplate.ocppVersion ?? OCPPVersion.VERSION_16
    createSerialNumber(stationTemplate, stationInfo)
    stationInfo.voltageOut = this.getVoltageOut(stationInfo)
    if (isNotEmptyArray(stationTemplate.power)) {
      const powerArrayRandomIndex = Math.floor(secureRandom() * stationTemplate.power.length)
      stationInfo.maximumPower =
        stationTemplate.powerUnit === PowerUnits.KILO_WATT
          ? stationTemplate.power[powerArrayRandomIndex] * 1000
          : stationTemplate.power[powerArrayRandomIndex]
    } else {
      stationInfo.maximumPower =
        stationTemplate.powerUnit === PowerUnits.KILO_WATT
          ? // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          stationTemplate.power! * 1000
          : stationTemplate.power
    }
    stationInfo.maximumAmperage = this.getMaximumAmperage(stationInfo)
    stationInfo.firmwareVersionPattern =
      stationTemplate.firmwareVersionPattern ?? Constants.SEMVER_PATTERN
    if (
      isNotEmptyString(stationInfo.firmwareVersion) &&
      !new RegExp(stationInfo.firmwareVersionPattern).test(stationInfo.firmwareVersion)
    ) {
      logger.warn(
        `${this.logPrefix()} Firmware version '${stationInfo.firmwareVersion}' in template file ${
          this.templateFile
        } does not match firmware version pattern '${stationInfo.firmwareVersionPattern}'`
      )
    }
    stationInfo.firmwareUpgrade = merge<FirmwareUpgrade>(
      {
        versionUpgrade: {
          step: 1
        },
        reset: true
      },
      stationTemplate.firmwareUpgrade ?? {}
    )
    stationInfo.resetTime =
      stationTemplate.resetTime != null
        ? secondsToMilliseconds(stationTemplate.resetTime)
        : Constants.CHARGING_STATION_DEFAULT_RESET_TIME
    return stationInfo
  }

  private getStationInfoFromFile (
    stationInfoPersistentConfiguration = true
  ): ChargingStationInfo | undefined {
    let stationInfo: ChargingStationInfo | undefined
    if (stationInfoPersistentConfiguration) {
      stationInfo = this.getConfigurationFromFile()?.stationInfo
      if (stationInfo != null) {
        delete stationInfo.infoHash
      }
    }
    return stationInfo
  }

  private getStationInfo (): ChargingStationInfo {
    const defaultStationInfo = Constants.DEFAULT_STATION_INFO
    const stationInfoFromTemplate = this.getStationInfoFromTemplate()
    const stationInfoFromFile = this.getStationInfoFromFile(
      stationInfoFromTemplate.stationInfoPersistentConfiguration
    )
    // Priority:
    // 1. charging station info from template
    // 2. charging station info from configuration file
    if (
      stationInfoFromFile != null &&
      stationInfoFromFile.templateHash === stationInfoFromTemplate.templateHash
    ) {
      return { ...defaultStationInfo, ...stationInfoFromFile }
    }
    stationInfoFromFile != null &&
      propagateSerialNumber(
        this.getTemplateFromFile(),
        stationInfoFromFile,
        stationInfoFromTemplate
      )
    return { ...defaultStationInfo, ...stationInfoFromTemplate }
  }

  private saveStationInfo (): void {
    if (this.stationInfo?.stationInfoPersistentConfiguration === true) {
      this.saveConfiguration()
    }
  }

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

  private initialize (): void {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const stationTemplate = this.getTemplateFromFile()!
    checkTemplate(stationTemplate, this.logPrefix(), this.templateFile)
    this.configurationFile = join(
      dirname(this.templateFile.replace('station-templates', 'configurations')),
      `${getHashId(this.index, stationTemplate)}.json`
    )
    const stationConfiguration = this.getConfigurationFromFile()
    if (
      stationConfiguration?.stationInfo?.templateHash === stationTemplate.templateHash &&
      (stationConfiguration?.connectorsStatus != null || stationConfiguration?.evsesStatus != null)
    ) {
      checkConfiguration(stationConfiguration, this.logPrefix(), this.configurationFile)
      this.initializeConnectorsOrEvsesFromFile(stationConfiguration)
    } else {
      this.initializeConnectorsOrEvsesFromTemplate(stationTemplate)
    }
    this.stationInfo = this.getStationInfo()
    if (
      this.stationInfo.firmwareStatus === FirmwareStatus.Installing &&
      isNotEmptyString(this.stationInfo.firmwareVersion) &&
      isNotEmptyString(this.stationInfo.firmwareVersionPattern)
    ) {
      const patternGroup =
        this.stationInfo.firmwareUpgrade?.versionUpgrade?.patternGroup ??
        this.stationInfo.firmwareVersion.split('.').length
      const match = new RegExp(this.stationInfo.firmwareVersionPattern)
        .exec(this.stationInfo.firmwareVersion)
        ?.slice(1, patternGroup + 1)
      if (match != null) {
        const patchLevelIndex = match.length - 1
        match[patchLevelIndex] = (
          convertToInt(match[patchLevelIndex]) +
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          this.stationInfo.firmwareUpgrade!.versionUpgrade!.step!
        ).toString()
        this.stationInfo.firmwareVersion = match.join('.')
      }
    }
    this.saveStationInfo()
    this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl()
    if (this.stationInfo.enableStatistics === true) {
      this.performanceStatistics = PerformanceStatistics.getInstance(
        this.stationInfo.hashId,
        this.stationInfo.chargingStationId,
        this.configuredSupervisionUrl
      )
    }
    const bootNotificationRequest = createBootNotificationRequest(this.stationInfo)
    if (bootNotificationRequest == null) {
      const errorMsg = 'Error while creating boot notification request'
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    }
    this.bootNotificationRequest = bootNotificationRequest
    this.powerDivider = this.getPowerDivider()
    // OCPP configuration
    this.ocppConfiguration = this.getOcppConfiguration()
    this.initializeOcppConfiguration()
    this.initializeOcppServices()
    if (this.stationInfo.autoRegister === true) {
      this.bootNotificationResponse = {
        currentTime: new Date(),
        interval: millisecondsToSeconds(this.getHeartbeatInterval()),
        status: RegistrationStatusEnumType.ACCEPTED
      }
    }
  }

  private initializeOcppServices (): void {
    const ocppVersion = this.stationInfo?.ocppVersion
    switch (ocppVersion) {
      case OCPPVersion.VERSION_16:
        this.ocppIncomingRequestService =
          OCPP16IncomingRequestService.getInstance<OCPP16IncomingRequestService>()
        this.ocppRequestService = OCPP16RequestService.getInstance<OCPP16RequestService>(
          OCPP16ResponseService.getInstance<OCPP16ResponseService>()
        )
        break
      case OCPPVersion.VERSION_20:
      case OCPPVersion.VERSION_201:
        this.ocppIncomingRequestService =
          OCPP20IncomingRequestService.getInstance<OCPP20IncomingRequestService>()
        this.ocppRequestService = OCPP20RequestService.getInstance<OCPP20RequestService>(
          OCPP20ResponseService.getInstance<OCPP20ResponseService>()
        )
        break
      default:
        this.handleUnsupportedVersion(ocppVersion)
        break
    }
  }

  private initializeOcppConfiguration (): void {
    if (getConfigurationKey(this, StandardParametersKey.HeartbeatInterval) == null) {
      addConfigurationKey(this, StandardParametersKey.HeartbeatInterval, '0')
    }
    if (getConfigurationKey(this, StandardParametersKey.HeartBeatInterval) == null) {
      addConfigurationKey(this, StandardParametersKey.HeartBeatInterval, '0', { visible: false })
    }
    if (
      this.stationInfo?.supervisionUrlOcppConfiguration === true &&
      isNotEmptyString(this.stationInfo.supervisionUrlOcppKey) &&
      getConfigurationKey(this, this.stationInfo.supervisionUrlOcppKey) == null
    ) {
      addConfigurationKey(
        this,
        this.stationInfo.supervisionUrlOcppKey,
        this.configuredSupervisionUrl.href,
        { reboot: true }
      )
    } else if (
      this.stationInfo?.supervisionUrlOcppConfiguration === false &&
      isNotEmptyString(this.stationInfo.supervisionUrlOcppKey) &&
      getConfigurationKey(this, this.stationInfo.supervisionUrlOcppKey) != null
    ) {
      deleteConfigurationKey(this, this.stationInfo.supervisionUrlOcppKey, { save: false })
    }
    if (
      isNotEmptyString(this.stationInfo?.amperageLimitationOcppKey) &&
      getConfigurationKey(this, this.stationInfo.amperageLimitationOcppKey) == null
    ) {
      addConfigurationKey(
        this,
        this.stationInfo.amperageLimitationOcppKey,
        // prettier-ignore
        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
        (this.stationInfo.maximumAmperage! * getAmperageLimitationUnitDivider(this.stationInfo)).toString()
      )
    }
    if (getConfigurationKey(this, StandardParametersKey.SupportedFeatureProfiles) == null) {
      addConfigurationKey(
        this,
        StandardParametersKey.SupportedFeatureProfiles,
        `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.FirmwareManagement},${SupportedFeatureProfiles.LocalAuthListManagement},${SupportedFeatureProfiles.SmartCharging},${SupportedFeatureProfiles.RemoteTrigger}`
      )
    }
    addConfigurationKey(
      this,
      StandardParametersKey.NumberOfConnectors,
      this.getNumberOfConnectors().toString(),
      { readonly: true },
      { overwrite: true }
    )
    if (getConfigurationKey(this, StandardParametersKey.MeterValuesSampledData) == null) {
      addConfigurationKey(
        this,
        StandardParametersKey.MeterValuesSampledData,
        MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
      )
    }
    if (getConfigurationKey(this, StandardParametersKey.ConnectorPhaseRotation) == null) {
      const connectorsPhaseRotation: string[] = []
      if (this.hasEvses) {
        for (const evseStatus of this.evses.values()) {
          for (const connectorId of evseStatus.connectors.keys()) {
            connectorsPhaseRotation.push(
              // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
              getPhaseRotationValue(connectorId, this.getNumberOfPhases())!
            )
          }
        }
      } else {
        for (const connectorId of this.connectors.keys()) {
          connectorsPhaseRotation.push(
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            getPhaseRotationValue(connectorId, this.getNumberOfPhases())!
          )
        }
      }
      addConfigurationKey(
        this,
        StandardParametersKey.ConnectorPhaseRotation,
        connectorsPhaseRotation.toString()
      )
    }
    if (getConfigurationKey(this, StandardParametersKey.AuthorizeRemoteTxRequests) == null) {
      addConfigurationKey(this, StandardParametersKey.AuthorizeRemoteTxRequests, 'true')
    }
    if (
      getConfigurationKey(this, StandardParametersKey.LocalAuthListEnabled) == null &&
      hasFeatureProfile(this, SupportedFeatureProfiles.LocalAuthListManagement) === true
    ) {
      addConfigurationKey(this, StandardParametersKey.LocalAuthListEnabled, 'false')
    }
    if (getConfigurationKey(this, StandardParametersKey.ConnectionTimeOut) == null) {
      addConfigurationKey(
        this,
        StandardParametersKey.ConnectionTimeOut,
        Constants.DEFAULT_CONNECTION_TIMEOUT.toString()
      )
    }
    this.saveOcppConfiguration()
  }

  private initializeConnectorsOrEvsesFromFile (configuration: ChargingStationConfiguration): void {
    if (configuration.connectorsStatus != null && configuration.evsesStatus == null) {
      for (const [connectorId, connectorStatus] of configuration.connectorsStatus.entries()) {
        this.connectors.set(connectorId, clone<ConnectorStatus>(connectorStatus))
      }
    } else if (configuration.evsesStatus != null && configuration.connectorsStatus == null) {
      for (const [evseId, evseStatusConfiguration] of configuration.evsesStatus.entries()) {
        const evseStatus = clone<EvseStatusConfiguration>(evseStatusConfiguration)
        delete evseStatus.connectorsStatus
        this.evses.set(evseId, {
          ...(evseStatus as EvseStatus),
          connectors: new Map<number, ConnectorStatus>(
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            evseStatusConfiguration.connectorsStatus!.map((connectorStatus, connectorId) => [
              connectorId,
              connectorStatus
            ])
          )
        })
      }
    } else if (configuration.evsesStatus != null && configuration.connectorsStatus != null) {
      const errorMsg = `Connectors and evses defined at the same time in configuration file ${this.configurationFile}`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    } else {
      const errorMsg = `No connectors or evses defined in configuration file ${this.configurationFile}`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    }
  }

  private initializeConnectorsOrEvsesFromTemplate (stationTemplate: ChargingStationTemplate): void {
    if (stationTemplate.Connectors != null && stationTemplate.Evses == null) {
      this.initializeConnectorsFromTemplate(stationTemplate)
    } else if (stationTemplate.Evses != null && stationTemplate.Connectors == null) {
      this.initializeEvsesFromTemplate(stationTemplate)
    } else if (stationTemplate.Evses != null && stationTemplate.Connectors != null) {
      const errorMsg = `Connectors and evses defined at the same time in template file ${this.templateFile}`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    } else {
      const errorMsg = `No connectors or evses defined in template file ${this.templateFile}`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    }
  }

  private initializeConnectorsFromTemplate (stationTemplate: ChargingStationTemplate): void {
    if (stationTemplate.Connectors == null && this.connectors.size === 0) {
      const errorMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    }
    if (stationTemplate.Connectors?.[0] == null) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no connector id 0 configuration`
      )
    }
    if (stationTemplate.Connectors != null) {
      const { configuredMaxConnectors, templateMaxConnectors, templateMaxAvailableConnectors } =
        checkConnectorsConfiguration(stationTemplate, this.logPrefix(), this.templateFile)
      const connectorsConfigHash = createHash(Constants.DEFAULT_HASH_ALGORITHM)
        .update(
          `${JSON.stringify(stationTemplate.Connectors)}${configuredMaxConnectors.toString()}`
        )
        .digest('hex')
      const connectorsConfigChanged =
        this.connectors.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash
      if (this.connectors.size === 0 || connectorsConfigChanged) {
        connectorsConfigChanged && this.connectors.clear()
        this.connectorsConfigurationHash = connectorsConfigHash
        if (templateMaxConnectors > 0) {
          for (let connectorId = 0; connectorId <= configuredMaxConnectors; connectorId++) {
            if (
              connectorId === 0 &&
              // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
              (stationTemplate.Connectors[connectorId] == null ||
                !this.getUseConnectorId0(stationTemplate))
            ) {
              continue
            }
            const templateConnectorId =
              connectorId > 0 && stationTemplate.randomConnectors === true
                ? getRandomInteger(templateMaxAvailableConnectors, 1)
                : connectorId
            const connectorStatus = stationTemplate.Connectors[templateConnectorId]
            checkStationInfoConnectorStatus(
              templateConnectorId,
              connectorStatus,
              this.logPrefix(),
              this.templateFile
            )
            this.connectors.set(connectorId, clone<ConnectorStatus>(connectorStatus))
          }
          initializeConnectorsMapStatus(this.connectors, this.logPrefix())
          this.saveConnectorsStatus()
        } else {
          logger.warn(
            `${this.logPrefix()} Charging station information from template ${
              this.templateFile
            } with no connectors configuration defined, cannot create connectors`
          )
        }
      }
    } else {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no connectors configuration defined, using already defined connectors`
      )
    }
  }

  private initializeEvsesFromTemplate (stationTemplate: ChargingStationTemplate): void {
    if (stationTemplate.Evses == null && this.evses.size === 0) {
      const errorMsg = `No already defined evses and charging station information from template ${this.templateFile} with no evses configuration defined`
      logger.error(`${this.logPrefix()} ${errorMsg}`)
      throw new BaseError(errorMsg)
    }
    if (stationTemplate.Evses?.[0] == null) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no evse id 0 configuration`
      )
    }
    if (stationTemplate.Evses?.[0]?.Connectors[0] == null) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with evse id 0 with no connector id 0 configuration`
      )
    }
    if (Object.keys(stationTemplate.Evses?.[0]?.Connectors as object).length > 1) {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with evse id 0 with more than one connector configuration, only connector id 0 configuration will be used`
      )
    }
    if (stationTemplate.Evses != null) {
      const evsesConfigHash = createHash(Constants.DEFAULT_HASH_ALGORITHM)
        .update(JSON.stringify(stationTemplate.Evses))
        .digest('hex')
      const evsesConfigChanged =
        this.evses.size !== 0 && this.evsesConfigurationHash !== evsesConfigHash
      if (this.evses.size === 0 || evsesConfigChanged) {
        evsesConfigChanged && this.evses.clear()
        this.evsesConfigurationHash = evsesConfigHash
        const templateMaxEvses = getMaxNumberOfEvses(stationTemplate.Evses)
        if (templateMaxEvses > 0) {
          for (const evseKey in stationTemplate.Evses) {
            const evseId = convertToInt(evseKey)
            this.evses.set(evseId, {
              connectors: buildConnectorsMap(
                stationTemplate.Evses[evseKey].Connectors,
                this.logPrefix(),
                this.templateFile
              ),
              availability: AvailabilityType.Operative
            })
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            initializeConnectorsMapStatus(this.evses.get(evseId)!.connectors, this.logPrefix())
          }
          this.saveEvsesStatus()
        } else {
          logger.warn(
            `${this.logPrefix()} Charging station information from template ${
              this.templateFile
            } with no evses configuration defined, cannot create evses`
          )
        }
      }
    } else {
      logger.warn(
        `${this.logPrefix()} Charging station information from template ${
          this.templateFile
        } with no evses configuration defined, using already defined evses`
      )
    }
  }

  private getConfigurationFromFile (): ChargingStationConfiguration | undefined {
    let configuration: ChargingStationConfiguration | undefined
    if (isNotEmptyString(this.configurationFile) && 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(
            readFileSync(this.configurationFile, 'utf8')
          ) as ChargingStationConfiguration
          PerformanceStatistics.endMeasure(measureId, beginId)
          this.sharedLRUCache.setChargingStationConfiguration(configuration)
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          this.configurationFileHash = configuration.configurationHash!
        }
      } catch (error) {
        handleFileException(
          this.configurationFile,
          FileType.ChargingStationConfiguration,
          error as NodeJS.ErrnoException,
          this.logPrefix()
        )
      }
    }
    return configuration
  }

  private saveAutomaticTransactionGeneratorConfiguration (): void {
    if (this.stationInfo?.automaticTransactionGeneratorPersistentConfiguration === true) {
      this.saveConfiguration()
    }
  }

  private saveConnectorsStatus (): void {
    this.saveConfiguration()
  }

  private saveEvsesStatus (): void {
    this.saveConfiguration()
  }

  private saveConfiguration (): void {
    if (isNotEmptyString(this.configurationFile)) {
      try {
        if (!existsSync(dirname(this.configurationFile))) {
          mkdirSync(dirname(this.configurationFile), { recursive: true })
        }
        const configurationFromFile = this.getConfigurationFromFile()
        let configurationData: ChargingStationConfiguration =
          configurationFromFile != null
            ? clone<ChargingStationConfiguration>(configurationFromFile)
            : {}
        if (this.stationInfo?.stationInfoPersistentConfiguration === true) {
          configurationData.stationInfo = this.stationInfo
        } else {
          delete configurationData.stationInfo
        }
        if (
          this.stationInfo?.ocppPersistentConfiguration === true &&
          Array.isArray(this.ocppConfiguration?.configurationKey)
        ) {
          configurationData.configurationKey = this.ocppConfiguration.configurationKey
        } else {
          delete configurationData.configurationKey
        }
        configurationData = merge<ChargingStationConfiguration>(
          configurationData,
          buildChargingStationAutomaticTransactionGeneratorConfiguration(this)
        )
        if (
          this.stationInfo?.automaticTransactionGeneratorPersistentConfiguration === false ||
          this.getAutomaticTransactionGeneratorConfiguration() == null
        ) {
          delete configurationData.automaticTransactionGenerator
        }
        if (this.connectors.size > 0) {
          configurationData.connectorsStatus = buildConnectorsStatus(this)
        } else {
          delete configurationData.connectorsStatus
        }
        if (this.evses.size > 0) {
          configurationData.evsesStatus = buildEvsesStatus(this)
        } else {
          delete configurationData.evsesStatus
        }
        delete configurationData.configurationHash
        const configurationHash = createHash(Constants.DEFAULT_HASH_ALGORITHM)
          .update(
            JSON.stringify({
              stationInfo: configurationData.stationInfo,
              configurationKey: configurationData.configurationKey,
              automaticTransactionGenerator: configurationData.automaticTransactionGenerator,
              ...(this.connectors.size > 0 && {
                connectorsStatus: configurationData.connectorsStatus
              }),
              ...(this.evses.size > 0 && { evsesStatus: configurationData.evsesStatus })
            } satisfies ChargingStationConfiguration)
          )
          .digest('hex')
        if (this.configurationFileHash !== configurationHash) {
          AsyncLock.runExclusive(AsyncLockType.configuration, () => {
            configurationData.configurationHash = configurationHash
            const measureId = `${FileType.ChargingStationConfiguration} write`
            const beginId = PerformanceStatistics.beginMeasure(measureId)
            writeFileSync(
              this.configurationFile,
              JSON.stringify(configurationData, undefined, 2),
              'utf8'
            )
            PerformanceStatistics.endMeasure(measureId, beginId)
            this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash)
            this.sharedLRUCache.setChargingStationConfiguration(configurationData)
            this.configurationFileHash = configurationHash
          }).catch(error => {
            handleFileException(
              this.configurationFile,
              FileType.ChargingStationConfiguration,
              error as NodeJS.ErrnoException,
              this.logPrefix()
            )
          })
        } else {
          logger.debug(
            `${this.logPrefix()} Not saving unchanged charging station configuration file ${
              this.configurationFile
            }`
          )
        }
      } catch (error) {
        handleFileException(
          this.configurationFile,
          FileType.ChargingStationConfiguration,
          error as NodeJS.ErrnoException,
          this.logPrefix()
        )
      }
    } else {
      logger.error(
        `${this.logPrefix()} Trying to save charging station configuration to undefined configuration file`
      )
    }
  }

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

  private getOcppConfigurationFromFile (): ChargingStationOcppConfiguration | undefined {
    const configurationKey = this.getConfigurationFromFile()?.configurationKey
    if (this.stationInfo?.ocppPersistentConfiguration === true && Array.isArray(configurationKey)) {
      return { configurationKey }
    }
    return undefined
  }

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

  private async onOpen (): Promise<void> {
    if (this.isWebSocketConnectionOpened()) {
      logger.info(
        `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} succeeded`
      )
      let registrationRetryCount = 0
      if (!this.isRegistered()) {
        // Send BootNotification
        do {
          this.bootNotificationResponse = await this.ocppRequestService.requestHandler<
          BootNotificationRequest,
          BootNotificationResponse
          >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
            skipBufferingOnError: true
          })
          // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
          if (this.bootNotificationResponse?.currentTime != null) {
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            this.bootNotificationResponse.currentTime = convertToDate(
              this.bootNotificationResponse.currentTime
            )!
          }
          if (!this.isRegistered()) {
            this.stationInfo?.registrationMaxRetries !== -1 && ++registrationRetryCount
            await sleep(
              // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
              this.bootNotificationResponse?.interval != null
                ? secondsToMilliseconds(this.bootNotificationResponse.interval)
                : Constants.DEFAULT_BOOT_NOTIFICATION_INTERVAL
            )
          }
        } while (
          !this.isRegistered() &&
          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
          (registrationRetryCount <= this.stationInfo!.registrationMaxRetries! ||
            this.stationInfo?.registrationMaxRetries === -1)
        )
      }
      if (this.isRegistered()) {
        this.emit(ChargingStationEvents.registered)
        if (this.inAcceptedState()) {
          this.emit(ChargingStationEvents.accepted)
        }
      } else {
        if (this.inRejectedState()) {
          this.emit(ChargingStationEvents.rejected)
        }
        logger.error(
          `${this.logPrefix()} Registration failure: maximum retries reached (${registrationRetryCount}) or retry disabled (${
            this.stationInfo?.registrationMaxRetries
          })`
        )
      }
      this.wsConnectionRetryCount = 0
      this.emit(ChargingStationEvents.updated)
    } else {
      logger.warn(
        `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} failed`
      )
    }
  }

  private onClose (code: WebSocketCloseEventStatusCode, reason: Buffer): void {
    this.emit(ChargingStationEvents.disconnected)
    switch (code) {
      // Normal close
      case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
      case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
        logger.info(
          `${this.logPrefix()} WebSocket normally closed with status '${getWebSocketCloseEventStatusString(
            code
          )}' and reason '${reason.toString()}'`
        )
        this.wsConnectionRetryCount = 0
        break
      // Abnormal close
      default:
        logger.error(
          `${this.logPrefix()} WebSocket abnormally closed with status '${getWebSocketCloseEventStatusString(
            code
          )}' and reason '${reason.toString()}'`
        )
        this.started &&
          this.reconnect().catch(error =>
            logger.error(`${this.logPrefix()} Error while reconnecting:`, error)
          )
        break
    }
    this.emit(ChargingStationEvents.updated)
  }

  private getCachedRequest (messageType: MessageType, messageId: string): CachedRequest | undefined {
    const cachedRequest = this.requests.get(messageId)
    if (Array.isArray(cachedRequest)) {
      return cachedRequest
    }
    throw new OCPPError(
      ErrorType.PROTOCOL_ERROR,
      `Cached request for message id ${messageId} ${getMessageTypeString(
        messageType
      )} is not an array`,
      undefined,
      cachedRequest
    )
  }

  private async handleIncomingMessage (request: IncomingRequest): Promise<void> {
    const [messageType, messageId, commandName, commandPayload] = request
    if (this.stationInfo?.enableStatistics === 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
    )
    this.emit(ChargingStationEvents.updated)
  }

  private handleResponseMessage (response: Response): void {
    const [messageType, messageId, commandPayload] = response
    if (!this.requests.has(messageId)) {
      // Error
      throw new OCPPError(
        ErrorType.INTERNAL_ERROR,
        `Response for unknown message id ${messageId}`,
        undefined,
        commandPayload
      )
    }
    // Respond
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const [responseCallback, , requestCommandName, requestPayload] = this.getCachedRequest(
      messageType,
      messageId
    )!
    logger.debug(
      `${this.logPrefix()} << Command '${requestCommandName}' received response payload: ${JSON.stringify(
        response
      )}`
    )
    responseCallback(commandPayload, requestPayload)
  }

  private handleErrorMessage (errorResponse: ErrorResponse): void {
    const [messageType, messageId, errorType, errorMessage, errorDetails] = errorResponse
    if (!this.requests.has(messageId)) {
      // Error
      throw new OCPPError(
        ErrorType.INTERNAL_ERROR,
        `Error response for unknown message id ${messageId}`,
        undefined,
        { errorType, errorMessage, errorDetails }
      )
    }
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const [, errorCallback, requestCommandName] = this.getCachedRequest(messageType, messageId)!
    logger.debug(
      `${this.logPrefix()} << Command '${requestCommandName}' received error response payload: ${JSON.stringify(
        errorResponse
      )}`
    )
    errorCallback(new OCPPError(errorType, errorMessage, requestCommandName, errorDetails))
  }

  private async onMessage (data: RawData): Promise<void> {
    let request: IncomingRequest | Response | ErrorResponse | undefined
    let messageType: MessageType | undefined
    let errorMsg: string
    try {
      // eslint-disable-next-line @typescript-eslint/no-base-to-string
      request = JSON.parse(data.toString()) as IncomingRequest | Response | ErrorResponse
      if (Array.isArray(request)) {
        [messageType] = request
        // Check the type of message
        switch (messageType) {
          // Incoming Message
          case MessageType.CALL_MESSAGE:
            await this.handleIncomingMessage(request as IncomingRequest)
            break
          // Response Message
          case MessageType.CALL_RESULT_MESSAGE:
            this.handleResponseMessage(request as Response)
            break
          // Error Message
          case MessageType.CALL_ERROR_MESSAGE:
            this.handleErrorMessage(request as ErrorResponse)
            break
          // Unknown Message
          default:
            // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
            errorMsg = `Wrong message type ${messageType}`
            logger.error(`${this.logPrefix()} ${errorMsg}`)
            throw new OCPPError(ErrorType.PROTOCOL_ERROR, errorMsg)
        }
      } else {
        throw new OCPPError(
          ErrorType.PROTOCOL_ERROR,
          'Incoming message is not an array',
          undefined,
          {
            request
          }
        )
      }
    } catch (error) {
      if (!Array.isArray(request)) {
        logger.error(`${this.logPrefix()} Incoming message '${request}' parsing error:`, error)
        return
      }
      let commandName: IncomingRequestCommand | undefined
      let requestCommandName: RequestCommand | IncomingRequestCommand | undefined
      let errorCallback: ErrorCallback
      const [, messageId] = request
      switch (messageType) {
        case MessageType.CALL_MESSAGE:
          [, , commandName] = request as IncomingRequest
          // Send error
          await this.ocppRequestService.sendError(this, messageId, error as OCPPError, commandName)
          break
        case MessageType.CALL_RESULT_MESSAGE:
        case MessageType.CALL_ERROR_MESSAGE:
          if (this.requests.has(messageId)) {
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            [, errorCallback, requestCommandName] = this.getCachedRequest(messageType, messageId)!
            // Reject the deferred promise in case of error at response handling (rejecting an already fulfilled promise is a no-op)
            errorCallback(error as OCPPError, false)
          } else {
            // Remove the request from the cache in case of error at response handling
            this.requests.delete(messageId)
          }
          break
      }
      if (!(error instanceof OCPPError)) {
        logger.warn(
          `${this.logPrefix()} Error thrown at incoming OCPP command '${
            commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
            // eslint-disable-next-line @typescript-eslint/no-base-to-string
          }' message '${data.toString()}' handling is not an OCPPError:`,
          error
        )
      }
      logger.error(
        `${this.logPrefix()} Incoming OCPP command '${
          commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
          // eslint-disable-next-line @typescript-eslint/no-base-to-string
        }' message '${data.toString()}'${
          messageType !== MessageType.CALL_MESSAGE
            ? ` matching cached request '${JSON.stringify(this.requests.get(messageId))}'`
            : ''
        } processing error:`,
        error
      )
    }
  }

  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 | undefined,
    rounded = false
  ): number {
    if (this.stationInfo?.meteringPerTransaction === true) {
      return (
        (rounded
          ? connectorStatus?.transactionEnergyActiveImportRegisterValue != null
            ? Math.round(connectorStatus.transactionEnergyActiveImportRegisterValue)
            : undefined
          : connectorStatus?.transactionEnergyActiveImportRegisterValue) ?? 0
      )
    }
    return (
      (rounded
        ? connectorStatus?.energyActiveImportRegisterValue != null
          ? Math.round(connectorStatus.energyActiveImportRegisterValue)
          : undefined
        : connectorStatus?.energyActiveImportRegisterValue) ?? 0
    )
  }

  private getUseConnectorId0 (stationTemplate?: ChargingStationTemplate): boolean {
    return stationTemplate?.useConnectorId0 ?? true
  }

  private async stopRunningTransactions (reason?: StopTransactionReason): Promise<void> {
    if (this.hasEvses) {
      for (const [evseId, evseStatus] of this.evses) {
        if (evseId === 0) {
          continue
        }
        for (const [connectorId, connectorStatus] of evseStatus.connectors) {
          if (connectorStatus.transactionStarted === true) {
            await this.stopTransactionOnConnector(connectorId, reason)
          }
        }
      }
    } else {
      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 (getConfigurationKey(this, StandardParametersKey.ConnectionTimeOut) != null) {
      return convertToInt(
        getConfigurationKey(this, StandardParametersKey.ConnectionTimeOut)?.value ??
          Constants.DEFAULT_CONNECTION_TIMEOUT
      )
    }
    return Constants.DEFAULT_CONNECTION_TIMEOUT
  }

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

  private getMaximumAmperage (stationInfo?: ChargingStationInfo): number | undefined {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    const maximumPower = (stationInfo ?? this.stationInfo!).maximumPower!
    switch (this.getCurrentOutType(stationInfo)) {
      case CurrentType.AC:
        return ACElectricUtils.amperagePerPhaseFromPower(
          this.getNumberOfPhases(stationInfo),
          maximumPower / (this.hasEvses ? this.getNumberOfEvses() : this.getNumberOfConnectors()),
          this.getVoltageOut(stationInfo)
        )
      case CurrentType.DC:
        return DCElectricUtils.amperage(maximumPower, this.getVoltageOut(stationInfo))
    }
  }

  private getCurrentOutType (stationInfo?: ChargingStationInfo): CurrentType {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    return (stationInfo ?? this.stationInfo!).currentOutType ?? CurrentType.AC
  }

  private getVoltageOut (stationInfo?: ChargingStationInfo): Voltage {
    return (
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      (stationInfo ?? this.stationInfo!).voltageOut ??
      getDefaultVoltageOut(this.getCurrentOutType(stationInfo), this.logPrefix(), this.templateFile)
    )
  }

  private getAmperageLimitation (): number | undefined {
    if (
      isNotEmptyString(this.stationInfo?.amperageLimitationOcppKey) &&
      getConfigurationKey(this, this.stationInfo.amperageLimitationOcppKey) != null
    ) {
      return (
        convertToInt(getConfigurationKey(this, this.stationInfo.amperageLimitationOcppKey)?.value) /
        getAmperageLimitationUnitDivider(this.stationInfo)
      )
    }
  }

  private async startMessageSequence (ATGStopAbsoluteDuration?: boolean): Promise<void> {
    if (this.stationInfo?.autoRegister === true) {
      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
    if (this.hasEvses) {
      for (const [evseId, evseStatus] of this.evses) {
        if (evseId > 0) {
          for (const [connectorId, connectorStatus] of evseStatus.connectors) {
            const connectorBootStatus = getBootConnectorStatus(this, connectorId, connectorStatus)
            await sendAndSetConnectorStatus(this, connectorId, connectorBootStatus, evseId)
          }
        }
      }
    } else {
      for (const connectorId of this.connectors.keys()) {
        if (connectorId > 0) {
          const connectorBootStatus = getBootConnectorStatus(
            this,
            connectorId,
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            this.getConnectorStatus(connectorId)!
          )
          await sendAndSetConnectorStatus(this, connectorId, connectorBootStatus)
        }
      }
    }
    if (this.stationInfo?.firmwareStatus === FirmwareStatus.Installing) {
      await this.ocppRequestService.requestHandler<
      FirmwareStatusNotificationRequest,
      FirmwareStatusNotificationResponse
      >(this, RequestCommand.FIRMWARE_STATUS_NOTIFICATION, {
        status: FirmwareStatus.Installed
      })
      this.stationInfo.firmwareStatus = FirmwareStatus.Installed
    }

    // Start the ATG
    if (this.getAutomaticTransactionGeneratorConfiguration()?.enable === true) {
      this.startAutomaticTransactionGenerator(undefined, ATGStopAbsoluteDuration)
    }
    this.flushMessageBuffer()
  }

  private internalStopMessageSequence (): void {
    // Stop WebSocket ping
    this.stopWebSocketPing()
    // Stop heartbeat
    this.stopHeartbeat()
    // Stop the ATG
    if (this.automaticTransactionGenerator?.started === true) {
      this.stopAutomaticTransactionGenerator()
    }
  }

  private async stopMessageSequence (
    reason?: StopTransactionReason,
    stopTransactions = this.stationInfo?.stopTransactionsOnStopped
  ): Promise<void> {
    this.internalStopMessageSequence()
    // Stop ongoing transactions
    stopTransactions === true && (await this.stopRunningTransactions(reason))
    if (this.hasEvses) {
      for (const [evseId, evseStatus] of this.evses) {
        if (evseId > 0) {
          for (const [connectorId, connectorStatus] of evseStatus.connectors) {
            await sendAndSetConnectorStatus(
              this,
              connectorId,
              ConnectorStatusEnum.Unavailable,
              evseId
            )
            delete connectorStatus.status
          }
        }
      }
    } else {
      for (const connectorId of this.connectors.keys()) {
        if (connectorId > 0) {
          await sendAndSetConnectorStatus(this, connectorId, ConnectorStatusEnum.Unavailable)
          delete this.getConnectorStatus(connectorId)?.status
        }
      }
    }
  }

  private startWebSocketPing (): void {
    const webSocketPingInterval =
      getConfigurationKey(this, StandardParametersKey.WebSocketPingInterval) != null
        ? convertToInt(
          getConfigurationKey(this, StandardParametersKey.WebSocketPingInterval)?.value
        )
        : 0
    if (webSocketPingInterval > 0 && this.wsPingSetInterval == null) {
      this.wsPingSetInterval = setInterval(() => {
        if (this.isWebSocketConnectionOpened()) {
          this.wsConnection?.ping()
        }
      }, secondsToMilliseconds(webSocketPingInterval))
      logger.info(
        `${this.logPrefix()} WebSocket ping started every ${formatDurationSeconds(
          webSocketPingInterval
        )}`
      )
    } else if (this.wsPingSetInterval != null) {
      logger.info(
        `${this.logPrefix()} WebSocket ping already started every ${formatDurationSeconds(
          webSocketPingInterval
        )}`
      )
    } else {
      logger.error(
        `${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval}, not starting the WebSocket ping`
      )
    }
  }

  private stopWebSocketPing (): void {
    if (this.wsPingSetInterval != null) {
      clearInterval(this.wsPingSetInterval)
      delete this.wsPingSetInterval
    }
  }

  private getConfiguredSupervisionUrl (): URL {
    let configuredSupervisionUrl: string
    const supervisionUrls = this.stationInfo?.supervisionUrls ?? Configuration.getSupervisionUrls()
    if (isNotEmptyArray(supervisionUrls)) {
      let configuredSupervisionUrlIndex: number
      switch (Configuration.getSupervisionUrlDistribution()) {
        case SupervisionUrlDistribution.RANDOM:
          configuredSupervisionUrlIndex = Math.floor(secureRandom() * supervisionUrls.length)
          break
        case SupervisionUrlDistribution.ROUND_ROBIN:
        case SupervisionUrlDistribution.CHARGING_STATION_AFFINITY:
        default:
          !Object.values(SupervisionUrlDistribution).includes(
            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
            Configuration.getSupervisionUrlDistribution()!
          ) &&
            logger.error(
              // eslint-disable-next-line @typescript-eslint/no-base-to-string
              `${this.logPrefix()} Unknown supervision url distribution '${Configuration.getSupervisionUrlDistribution()}' from values '${SupervisionUrlDistribution.toString()}', defaulting to ${
                SupervisionUrlDistribution.CHARGING_STATION_AFFINITY
              }`
            )
          configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length
          break
      }
      configuredSupervisionUrl = supervisionUrls[configuredSupervisionUrlIndex]
    } else {
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      configuredSupervisionUrl = supervisionUrls!
    }
    if (isNotEmptyString(configuredSupervisionUrl)) {
      return new URL(configuredSupervisionUrl)
    }
    const errorMsg = 'No supervision url(s) configured'
    logger.error(`${this.logPrefix()} ${errorMsg}`)
    throw new BaseError(errorMsg)
  }

  private stopHeartbeat (): void {
    if (this.heartbeatSetInterval != null) {
      clearInterval(this.heartbeatSetInterval)
      delete this.heartbeatSetInterval
    }
  }

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

  private async reconnect (): Promise<void> {
    if (
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      this.wsConnectionRetryCount < this.stationInfo!.autoReconnectMaxRetries! ||
      this.stationInfo?.autoReconnectMaxRetries === -1
    ) {
      this.wsConnectionRetried = true
      ++this.wsConnectionRetryCount
      const reconnectDelay =
        this.stationInfo?.reconnectExponentialDelay === true
          ? exponentialDelay(this.wsConnectionRetryCount)
          : secondsToMilliseconds(this.getConnectionTimeout())
      const reconnectDelayWithdraw = 1000
      const reconnectTimeout =
        reconnectDelay - reconnectDelayWithdraw > 0 ? reconnectDelay - reconnectDelayWithdraw : 0
      logger.error(
        `${this.logPrefix()} WebSocket connection retry in ${roundTo(
          reconnectDelay,
          2
        )}ms, timeout ${reconnectTimeout}ms`
      )
      await sleep(reconnectDelay)
      logger.error(
        `${this.logPrefix()} WebSocket connection retry #${this.wsConnectionRetryCount.toString()}`
      )
      this.openWSConnection(
        {
          handshakeTimeout: reconnectTimeout
        },
        { closeOpened: true }
      )
    } else if (this.stationInfo?.autoReconnectMaxRetries !== -1) {
      logger.error(
        `${this.logPrefix()} WebSocket connection retries failure: maximum retries reached (${
          this.wsConnectionRetryCount
        }) or retries disabled (${this.stationInfo?.autoReconnectMaxRetries})`
      )
    }
  }
}