src/charging-station/ChargingStation.ts

   1 // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
   2
   3 import crypto from 'node:crypto';
   4 import fs from 'node:fs';
   5 import path from 'node:path';
   6 import { URL } from 'node:url';
   7 import { parentPort } from 'node:worker_threads';
   8
   9 import merge from 'just-merge';
  10 import WebSocket, { type RawData } from 'ws';
  11
  12 import {
  13   AutomaticTransactionGenerator,
  14   ChargingStationConfigurationUtils,
  15   ChargingStationUtils,
  16   ChargingStationWorkerBroadcastChannel,
  17   IdTagsCache,
  18   MessageChannelUtils,
  19   SharedLRUCache,
  20 } from './internal';
  21 import {
  22   // OCPP16IncomingRequestService,
  23   OCPP16RequestService,
  24   // OCPP16ResponseService,
  25   OCPP16ServiceUtils,
  26   OCPP20IncomingRequestService,
  27   OCPP20RequestService,
  28   // OCPP20ResponseService,
  29   type OCPPIncomingRequestService,
  30   type OCPPRequestService,
  31   // OCPPServiceUtils,
  32 } from './ocpp';
  33 import { OCPP16IncomingRequestService } from './ocpp/1.6/OCPP16IncomingRequestService';
  34 import { OCPP16ResponseService } from './ocpp/1.6/OCPP16ResponseService';
  35 import { OCPP20ResponseService } from './ocpp/2.0/OCPP20ResponseService';
  36 import { OCPPServiceUtils } from './ocpp/OCPPServiceUtils';
  37 import { BaseError, OCPPError } from '../exception';
  38 import { PerformanceStatistics } from '../performance';
  39 import {
  40   type AutomaticTransactionGeneratorConfiguration,
  41   AvailabilityType,
  42   type BootNotificationRequest,
  43   type BootNotificationResponse,
  44   type CachedRequest,
  45   type ChargingStationConfiguration,
  46   type ChargingStationInfo,
  47   type ChargingStationOcppConfiguration,
  48   type ChargingStationTemplate,
  49   ConnectorPhaseRotation,
  50   type ConnectorStatus,
  51   ConnectorStatusEnum,
  52   CurrentType,
  53   type ErrorCallback,
  54   type ErrorResponse,
  55   ErrorType,
  56   type EvseStatus,
  57   type EvseStatusConfiguration,
  58   FileType,
  59   FirmwareStatus,
  60   type FirmwareStatusNotificationRequest,
  61   type FirmwareStatusNotificationResponse,
  62   type FirmwareUpgrade,
  63   type HeartbeatRequest,
  64   type HeartbeatResponse,
  65   type IncomingRequest,
  66   type IncomingRequestCommand,
  67   type JsonType,
  68   MessageType,
  69   type MeterValue,
  70   MeterValueMeasurand,
  71   type MeterValuesRequest,
  72   type MeterValuesResponse,
  73   OCPPVersion,
  74   type OutgoingRequest,
  75   PowerUnits,
  76   RegistrationStatusEnumType,
  77   RequestCommand,
  78   type Response,
  79   StandardParametersKey,
  80   type StatusNotificationRequest,
  81   type StatusNotificationResponse,
  82   StopTransactionReason,
  83   type StopTransactionRequest,
  84   type StopTransactionResponse,
  85   SupervisionUrlDistribution,
  86   SupportedFeatureProfiles,
  87   VendorParametersKey,
  88   type WSError,
  89   WebSocketCloseEventStatusCode,
  90   type WsOptions,
  91 } from '../types';
  92 import {
  93   ACElectricUtils,
  94   Configuration,
  95   Constants,
  96   DCElectricUtils,
  97   FileUtils,
  98   Utils,
  99   logger,
 100 } from '../utils';
 101
 102 export class ChargingStation {
 103   public readonly index: number;
 104   public readonly templateFile: string;
 105   public stationInfo!: ChargingStationInfo;
 106   public started: boolean;
 107   public starting: boolean;
 108   public idTagsCache: IdTagsCache;
 109   public automaticTransactionGenerator!: AutomaticTransactionGenerator | undefined;
 110   public ocppConfiguration!: ChargingStationOcppConfiguration | undefined;
 111   public wsConnection!: WebSocket | null;
 112   public readonly connectors: Map<number, ConnectorStatus>;
 113   public readonly evses: Map<number, EvseStatus>;
 114   public readonly requests: Map<string, CachedRequest>;
 115   public performanceStatistics!: PerformanceStatistics | undefined;
 116   public heartbeatSetInterval!: NodeJS.Timeout;
 117   public ocppRequestService!: OCPPRequestService;
 118   public bootNotificationRequest!: BootNotificationRequest;
 119   public bootNotificationResponse!: BootNotificationResponse | undefined;
 120   public powerDivider!: number;
 121   private stopping: boolean;
 122   private configurationFile!: string;
 123   private configurationFileHash!: string;
 124   private connectorsConfigurationHash!: string;
 125   private evsesConfigurationHash!: string;
 126   private ocppIncomingRequestService!: OCPPIncomingRequestService;
 127   private readonly messageBuffer: Set<string>;
 128   private configuredSupervisionUrl!: URL;
 129   private wsConnectionRestarted: boolean;
 130   private autoReconnectRetryCount: number;
 131   private templateFileWatcher!: fs.FSWatcher | undefined;
 132   private readonly sharedLRUCache: SharedLRUCache;
 133   private webSocketPingSetInterval!: NodeJS.Timeout;
 134   private readonly chargingStationWorkerBroadcastChannel: ChargingStationWorkerBroadcastChannel;
 135
 136   constructor(index: number, templateFile: string) {
 137     this.started = false;
 138     this.starting = false;
 139     this.stopping = false;
 140     this.wsConnectionRestarted = false;
 141     this.autoReconnectRetryCount = 0;
 142     this.index = index;
 143     this.templateFile = templateFile;
 144     this.connectors = new Map<number, ConnectorStatus>();
 145     this.evses = new Map<number, EvseStatus>();
 146     this.requests = new Map<string, CachedRequest>();
 147     this.messageBuffer = new Set<string>();
 148     this.sharedLRUCache = SharedLRUCache.getInstance();
 149     this.idTagsCache = IdTagsCache.getInstance();
 150     this.chargingStationWorkerBroadcastChannel = new ChargingStationWorkerBroadcastChannel(this);
 151
 152     this.initialize();
 153   }
 154
 155   private get wsConnectionUrl(): URL {
 156     return new URL(
 157       `${
 158         this.getSupervisionUrlOcppConfiguration() &&
 159         Utils.isNotEmptyString(this.getSupervisionUrlOcppKey())
 160           ? ChargingStationConfigurationUtils.getConfigurationKey(
 161               this,
 162               this.getSupervisionUrlOcppKey()
 163             )?.value
 164           : this.configuredSupervisionUrl.href
 165       }/${this.stationInfo.chargingStationId}`
 166     );
 167   }
 168
 169   private get hasEvses(): boolean {
 170     return this.connectors.size === 0 && this.evses.size > 0;
 171   }
 172
 173   public logPrefix = (): string => {
 174     return Utils.logPrefix(
 175       ` ${
 176         (Utils.isNotEmptyString(this?.stationInfo?.chargingStationId)
 177           ? this?.stationInfo?.chargingStationId
 178           : ChargingStationUtils.getChargingStationId(this.index, this.getTemplateFromFile())) ??
 179         'Error at building log prefix'
 180       } |`
 181     );
 182   };
 183
 184   public hasIdTags(): boolean {
 185     const idTagsFile = ChargingStationUtils.getIdTagsFile(this.stationInfo);
 186     return Utils.isNotEmptyArray(this.idTagsCache.getIdTags(idTagsFile));
 187   }
 188
 189   public getEnableStatistics(): boolean {
 190     return this.stationInfo.enableStatistics ?? false;
 191   }
 192
 193   public getMustAuthorizeAtRemoteStart(): boolean {
 194     return this.stationInfo.mustAuthorizeAtRemoteStart ?? true;
 195   }
 196
 197   public getPayloadSchemaValidation(): boolean {
 198     return this.stationInfo.payloadSchemaValidation ?? true;
 199   }
 200
 201   public getNumberOfPhases(stationInfo?: ChargingStationInfo): number | undefined {
 202     const localStationInfo: ChargingStationInfo = stationInfo ?? this.stationInfo;
 203     switch (this.getCurrentOutType(stationInfo)) {
 204       case CurrentType.AC:
 205         return !Utils.isUndefined(localStationInfo.numberOfPhases)
 206           ? localStationInfo.numberOfPhases
 207           : 3;
 208       case CurrentType.DC:
 209         return 0;
 210     }
 211   }
 212
 213   public isWebSocketConnectionOpened(): boolean {
 214     return this?.wsConnection?.readyState === WebSocket.OPEN;
 215   }
 216
 217   public getRegistrationStatus(): RegistrationStatusEnumType | undefined {
 218     return this?.bootNotificationResponse?.status;
 219   }
 220
 221   public isInUnknownState(): boolean {
 222     return Utils.isNullOrUndefined(this?.bootNotificationResponse?.status);
 223   }
 224
 225   public isInPendingState(): boolean {
 226     return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.PENDING;
 227   }
 228
 229   public isInAcceptedState(): boolean {
 230     return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.ACCEPTED;
 231   }
 232
 233   public isInRejectedState(): boolean {
 234     return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.REJECTED;
 235   }
 236
 237   public isRegistered(): boolean {
 238     return (
 239       this.isInUnknownState() === false &&
 240       (this.isInAcceptedState() === true || this.isInPendingState() === true)
 241     );
 242   }
 243
 244   public isChargingStationAvailable(): boolean {
 245     return this.getConnectorStatus(0)?.availability === AvailabilityType.Operative;
 246   }
 247
 248   public isConnectorAvailable(connectorId: number): boolean {
 249     return (
 250       connectorId > 0 &&
 251       this.getConnectorStatus(connectorId)?.availability === AvailabilityType.Operative
 252     );
 253   }
 254
 255   public getNumberOfConnectors(): number {
 256     if (this.hasEvses) {
 257       let numberOfConnectors = 0;
 258       for (const [evseId, evseStatus] of this.evses) {
 259         if (evseId === 0) {
 260           continue;
 261         }
 262         numberOfConnectors += evseStatus.connectors.size;
 263       }
 264       return numberOfConnectors;
 265     }
 266     return this.connectors.has(0) ? this.connectors.size - 1 : this.connectors.size;
 267   }
 268
 269   public getNumberOfEvses(): number {
 270     return this.evses.has(0) ? this.evses.size - 1 : this.evses.size;
 271   }
 272
 273   public getConnectorStatus(connectorId: number): ConnectorStatus | undefined {
 274     if (this.hasEvses) {
 275       for (const evseStatus of this.evses.values()) {
 276         if (evseStatus.connectors.has(connectorId)) {
 277           return evseStatus.connectors.get(connectorId);
 278         }
 279       }
 280     }
 281     return this.connectors.get(connectorId);
 282   }
 283
 284   public getCurrentOutType(stationInfo?: ChargingStationInfo): CurrentType {
 285     return (stationInfo ?? this.stationInfo)?.currentOutType ?? CurrentType.AC;
 286   }
 287
 288   public getOcppStrictCompliance(): boolean {
 289     return this.stationInfo?.ocppStrictCompliance ?? false;
 290   }
 291
 292   public getVoltageOut(stationInfo?: ChargingStationInfo): number | undefined {
 293     const defaultVoltageOut = ChargingStationUtils.getDefaultVoltageOut(
 294       this.getCurrentOutType(stationInfo),
 295       this.templateFile,
 296       this.logPrefix()
 297     );
 298     const localStationInfo: ChargingStationInfo = stationInfo ?? this.stationInfo;
 299     return !Utils.isUndefined(localStationInfo.voltageOut)
 300       ? localStationInfo.voltageOut
 301       : defaultVoltageOut;
 302   }
 303
 304   public getMaximumPower(stationInfo?: ChargingStationInfo): number {
 305     const localStationInfo = stationInfo ?? this.stationInfo;
 306     return (localStationInfo['maxPower'] as number) ?? localStationInfo.maximumPower;
 307   }
 308
 309   public getConnectorMaximumAvailablePower(connectorId: number): number {
 310     let connectorAmperageLimitationPowerLimit: number;
 311     if (
 312       !Utils.isNullOrUndefined(this.getAmperageLimitation()) &&
 313       this.getAmperageLimitation() < this.stationInfo?.maximumAmperage
 314     ) {
 315       connectorAmperageLimitationPowerLimit =
 316         (this.getCurrentOutType() === CurrentType.AC
 317           ? ACElectricUtils.powerTotal(
 318               this.getNumberOfPhases(),
 319               this.getVoltageOut(),
 320               this.getAmperageLimitation() * this.getNumberOfConnectors()
 321             )
 322           : DCElectricUtils.power(this.getVoltageOut(), this.getAmperageLimitation())) /
 323         this.powerDivider;
 324     }
 325     const connectorMaximumPower = this.getMaximumPower() / this.powerDivider;
 326     const connectorChargingProfilesPowerLimit =
 327       ChargingStationUtils.getChargingStationConnectorChargingProfilesPowerLimit(this, connectorId);
 328     return Math.min(
 329       isNaN(connectorMaximumPower) ? Infinity : connectorMaximumPower,
 330       isNaN(connectorAmperageLimitationPowerLimit)
 331         ? Infinity
 332         : connectorAmperageLimitationPowerLimit,
 333       isNaN(connectorChargingProfilesPowerLimit) ? Infinity : connectorChargingProfilesPowerLimit
 334     );
 335   }
 336
 337   public getTransactionIdTag(transactionId: number): string | undefined {
 338     if (this.hasEvses) {
 339       for (const evseStatus of this.evses.values()) {
 340         for (const connectorStatus of evseStatus.connectors.values()) {
 341           if (connectorStatus.transactionId === transactionId) {
 342             return connectorStatus.transactionIdTag;
 343           }
 344         }
 345       }
 346     } else {
 347       for (const connectorId of this.connectors.keys()) {
 348         if (
 349           connectorId > 0 &&
 350           this.getConnectorStatus(connectorId)?.transactionId === transactionId
 351         ) {
 352           return this.getConnectorStatus(connectorId)?.transactionIdTag;
 353         }
 354       }
 355     }
 356   }
 357
 358   public getOutOfOrderEndMeterValues(): boolean {
 359     return this.stationInfo?.outOfOrderEndMeterValues ?? false;
 360   }
 361
 362   public getBeginEndMeterValues(): boolean {
 363     return this.stationInfo?.beginEndMeterValues ?? false;
 364   }
 365
 366   public getMeteringPerTransaction(): boolean {
 367     return this.stationInfo?.meteringPerTransaction ?? true;
 368   }
 369
 370   public getTransactionDataMeterValues(): boolean {
 371     return this.stationInfo?.transactionDataMeterValues ?? false;
 372   }
 373
 374   public getMainVoltageMeterValues(): boolean {
 375     return this.stationInfo?.mainVoltageMeterValues ?? true;
 376   }
 377
 378   public getPhaseLineToLineVoltageMeterValues(): boolean {
 379     return this.stationInfo?.phaseLineToLineVoltageMeterValues ?? false;
 380   }
 381
 382   public getCustomValueLimitationMeterValues(): boolean {
 383     return this.stationInfo?.customValueLimitationMeterValues ?? true;
 384   }
 385
 386   public getConnectorIdByTransactionId(transactionId: number): number | undefined {
 387     if (this.hasEvses) {
 388       for (const evseStatus of this.evses.values()) {
 389         for (const [connectorId, connectorStatus] of evseStatus.connectors) {
 390           if (connectorStatus.transactionId === transactionId) {
 391             return connectorId;
 392           }
 393         }
 394       }
 395     } else {
 396       for (const connectorId of this.connectors.keys()) {
 397         if (
 398           connectorId > 0 &&
 399           this.getConnectorStatus(connectorId)?.transactionId === transactionId
 400         ) {
 401           return connectorId;
 402         }
 403       }
 404     }
 405   }
 406
 407   public getEnergyActiveImportRegisterByTransactionId(
 408     transactionId: number,
 409     rounded = false
 410   ): number {
 411     return this.getEnergyActiveImportRegister(
 412       this.getConnectorStatus(this.getConnectorIdByTransactionId(transactionId)),
 413       rounded
 414     );
 415   }
 416
 417   public getEnergyActiveImportRegisterByConnectorId(connectorId: number, rounded = false): number {
 418     return this.getEnergyActiveImportRegister(this.getConnectorStatus(connectorId), rounded);
 419   }
 420
 421   public getAuthorizeRemoteTxRequests(): boolean {
 422     const authorizeRemoteTxRequests = ChargingStationConfigurationUtils.getConfigurationKey(
 423       this,
 424       StandardParametersKey.AuthorizeRemoteTxRequests
 425     );
 426     return authorizeRemoteTxRequests
 427       ? Utils.convertToBoolean(authorizeRemoteTxRequests.value)
 428       : false;
 429   }
 430
 431   public getLocalAuthListEnabled(): boolean {
 432     const localAuthListEnabled = ChargingStationConfigurationUtils.getConfigurationKey(
 433       this,
 434       StandardParametersKey.LocalAuthListEnabled
 435     );
 436     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 437   }
 438
 439   public getHeartbeatInterval(): number {
 440     const HeartbeatInterval = ChargingStationConfigurationUtils.getConfigurationKey(
 441       this,
 442       StandardParametersKey.HeartbeatInterval
 443     );
 444     if (HeartbeatInterval) {
 445       return Utils.convertToInt(HeartbeatInterval.value) * 1000;
 446     }
 447     const HeartBeatInterval = ChargingStationConfigurationUtils.getConfigurationKey(
 448       this,
 449       StandardParametersKey.HeartBeatInterval
 450     );
 451     if (HeartBeatInterval) {
 452       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
 453     }
 454     this.stationInfo?.autoRegister === false &&
 455       logger.warn(
 456         `${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${
 457           Constants.DEFAULT_HEARTBEAT_INTERVAL
 458         }`
 459       );
 460     return Constants.DEFAULT_HEARTBEAT_INTERVAL;
 461   }
 462
 463   public setSupervisionUrl(url: string): void {
 464     if (
 465       this.getSupervisionUrlOcppConfiguration() &&
 466       Utils.isNotEmptyString(this.getSupervisionUrlOcppKey())
 467     ) {
 468       ChargingStationConfigurationUtils.setConfigurationKeyValue(
 469         this,
 470         this.getSupervisionUrlOcppKey(),
 471         url
 472       );
 473     } else {
 474       this.stationInfo.supervisionUrls = url;
 475       this.saveStationInfo();
 476       this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl();
 477     }
 478   }
 479
 480   public startHeartbeat(): void {
 481     if (this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
 482       this.heartbeatSetInterval = setInterval(() => {
 483         this.ocppRequestService
 484           .requestHandler<HeartbeatRequest, HeartbeatResponse>(this, RequestCommand.HEARTBEAT)
 485           .catch((error) => {
 486             logger.error(
 487               `${this.logPrefix()} Error while sending '${RequestCommand.HEARTBEAT}':`,
 488               error
 489             );
 490           });
 491       }, this.getHeartbeatInterval());
 492       logger.info(
 493         `${this.logPrefix()} Heartbeat started every ${Utils.formatDurationMilliSeconds(
 494           this.getHeartbeatInterval()
 495         )}`
 496       );
 497     } else if (this.heartbeatSetInterval) {
 498       logger.info(
 499         `${this.logPrefix()} Heartbeat already started every ${Utils.formatDurationMilliSeconds(
 500           this.getHeartbeatInterval()
 501         )}`
 502       );
 503     } else {
 504       logger.error(
 505         `${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval()}, not starting the heartbeat`
 506       );
 507     }
 508   }
 509
 510   public restartHeartbeat(): void {
 511     // Stop heartbeat
 512     this.stopHeartbeat();
 513     // Start heartbeat
 514     this.startHeartbeat();
 515   }
 516
 517   public restartWebSocketPing(): void {
 518     // Stop WebSocket ping
 519     this.stopWebSocketPing();
 520     // Start WebSocket ping
 521     this.startWebSocketPing();
 522   }
 523
 524   public startMeterValues(connectorId: number, interval: number): void {
 525     if (connectorId === 0) {
 526       logger.error(
 527         `${this.logPrefix()} Trying to start MeterValues on connector id ${connectorId.toString()}`
 528       );
 529       return;
 530     }
 531     if (!this.getConnectorStatus(connectorId)) {
 532       logger.error(
 533         `${this.logPrefix()} Trying to start MeterValues on non existing connector id ${connectorId.toString()}`
 534       );
 535       return;
 536     }
 537     if (this.getConnectorStatus(connectorId)?.transactionStarted === false) {
 538       logger.error(
 539         `${this.logPrefix()} Trying to start MeterValues on connector id ${connectorId} with no transaction started`
 540       );
 541       return;
 542     } else if (
 543       this.getConnectorStatus(connectorId)?.transactionStarted === true &&
 544       Utils.isNullOrUndefined(this.getConnectorStatus(connectorId)?.transactionId)
 545     ) {
 546       logger.error(
 547         `${this.logPrefix()} Trying to start MeterValues on connector id ${connectorId} with no transaction id`
 548       );
 549       return;
 550     }
 551     if (interval > 0) {
 552       this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(() => {
 553         // FIXME: Implement OCPP version agnostic helpers
 554         const meterValue: MeterValue = OCPP16ServiceUtils.buildMeterValue(
 555           this,
 556           connectorId,
 557           this.getConnectorStatus(connectorId).transactionId,
 558           interval
 559         );
 560         this.ocppRequestService
 561           .requestHandler<MeterValuesRequest, MeterValuesResponse>(
 562             this,
 563             RequestCommand.METER_VALUES,
 564             {
 565               connectorId,
 566               transactionId: this.getConnectorStatus(connectorId)?.transactionId,
 567               meterValue: [meterValue],
 568             }
 569           )
 570           .catch((error) => {
 571             logger.error(
 572               `${this.logPrefix()} Error while sending '${RequestCommand.METER_VALUES}':`,
 573               error
 574             );
 575           });
 576       }, interval);
 577     } else {
 578       logger.error(
 579         `${this.logPrefix()} Charging station ${
 580           StandardParametersKey.MeterValueSampleInterval
 581         } configuration set to ${interval}, not sending MeterValues`
 582       );
 583     }
 584   }
 585
 586   public stopMeterValues(connectorId: number) {
 587     if (this.getConnectorStatus(connectorId)?.transactionSetInterval) {
 588       clearInterval(this.getConnectorStatus(connectorId)?.transactionSetInterval);
 589     }
 590   }
 591
 592   public start(): void {
 593     if (this.started === false) {
 594       if (this.starting === false) {
 595         this.starting = true;
 596         if (this.getEnableStatistics() === true) {
 597           this.performanceStatistics?.start();
 598         }
 599         this.openWSConnection();
 600         // Monitor charging station template file
 601         this.templateFileWatcher = FileUtils.watchJsonFile(
 602           this.templateFile,
 603           FileType.ChargingStationTemplate,
 604           this.logPrefix(),
 605           undefined,
 606           (event, filename): void => {
 607             if (Utils.isNotEmptyString(filename) && event === 'change') {
 608               try {
 609                 logger.debug(
 610                   `${this.logPrefix()} ${FileType.ChargingStationTemplate} ${
 611                     this.templateFile
 612                   } file have changed, reload`
 613                 );
 614                 this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
 615                 // Initialize
 616                 this.initialize();
 617                 // Restart the ATG
 618                 this.stopAutomaticTransactionGenerator();
 619                 if (
 620                   this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true
 621                 ) {
 622                   this.startAutomaticTransactionGenerator();
 623                 }
 624                 if (this.getEnableStatistics() === true) {
 625                   this.performanceStatistics?.restart();
 626                 } else {
 627                   this.performanceStatistics?.stop();
 628                 }
 629                 // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
 630               } catch (error) {
 631                 logger.error(
 632                   `${this.logPrefix()} ${FileType.ChargingStationTemplate} file monitoring error:`,
 633                   error
 634                 );
 635               }
 636             }
 637           }
 638         );
 639         this.started = true;
 640         parentPort?.postMessage(MessageChannelUtils.buildStartedMessage(this));
 641         this.starting = false;
 642       } else {
 643         logger.warn(`${this.logPrefix()} Charging station is already starting...`);
 644       }
 645     } else {
 646       logger.warn(`${this.logPrefix()} Charging station is already started...`);
 647     }
 648   }
 649
 650   public async stop(reason?: StopTransactionReason): Promise<void> {
 651     if (this.started === true) {
 652       if (this.stopping === false) {
 653         this.stopping = true;
 654         await this.stopMessageSequence(reason);
 655         this.closeWSConnection();
 656         if (this.getEnableStatistics() === true) {
 657           this.performanceStatistics?.stop();
 658         }
 659         this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
 660         this.templateFileWatcher?.close();
 661         this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
 662         delete this.bootNotificationResponse;
 663         this.started = false;
 664         parentPort?.postMessage(MessageChannelUtils.buildStoppedMessage(this));
 665         this.stopping = false;
 666       } else {
 667         logger.warn(`${this.logPrefix()} Charging station is already stopping...`);
 668       }
 669     } else {
 670       logger.warn(`${this.logPrefix()} Charging station is already stopped...`);
 671     }
 672   }
 673
 674   public async reset(reason?: StopTransactionReason): Promise<void> {
 675     await this.stop(reason);
 676     await Utils.sleep(this.stationInfo.resetTime);
 677     this.initialize();
 678     this.start();
 679   }
 680
 681   public saveOcppConfiguration(): void {
 682     if (this.getOcppPersistentConfiguration()) {
 683       this.saveConfiguration({ stationInfo: false, connectors: false, evses: false });
 684     }
 685   }
 686
 687   public hasFeatureProfile(featureProfile: SupportedFeatureProfiles): boolean | undefined {
 688     return ChargingStationConfigurationUtils.getConfigurationKey(
 689       this,
 690       StandardParametersKey.SupportedFeatureProfiles
 691     )?.value?.includes(featureProfile);
 692   }
 693
 694   public bufferMessage(message: string): void {
 695     this.messageBuffer.add(message);
 696   }
 697
 698   public openWSConnection(
 699     options: WsOptions = this.stationInfo?.wsOptions ?? {},
 700     params: { closeOpened?: boolean; terminateOpened?: boolean } = {
 701       closeOpened: false,
 702       terminateOpened: false,
 703     }
 704   ): void {
 705     options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
 706     params.closeOpened = params?.closeOpened ?? false;
 707     params.terminateOpened = params?.terminateOpened ?? false;
 708     if (this.started === false && this.starting === false) {
 709       logger.warn(
 710         `${this.logPrefix()} Cannot open OCPP connection to URL ${this.wsConnectionUrl.toString()} on stopped charging station`
 711       );
 712       return;
 713     }
 714     if (
 715       !Utils.isNullOrUndefined(this.stationInfo.supervisionUser) &&
 716       !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)
 717     ) {
 718       options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
 719     }
 720     if (params?.closeOpened) {
 721       this.closeWSConnection();
 722     }
 723     if (params?.terminateOpened) {
 724       this.terminateWSConnection();
 725     }
 726
 727     if (this.isWebSocketConnectionOpened() === true) {
 728       logger.warn(
 729         `${this.logPrefix()} OCPP connection to URL ${this.wsConnectionUrl.toString()} is already opened`
 730       );
 731       return;
 732     }
 733
 734     logger.info(
 735       `${this.logPrefix()} Open OCPP connection to URL ${this.wsConnectionUrl.toString()}`
 736     );
 737
 738     this.wsConnection = new WebSocket(
 739       this.wsConnectionUrl,
 740       `ocpp${this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16}`,
 741       options
 742     );
 743
 744     // Handle WebSocket message
 745     this.wsConnection.on(
 746       'message',
 747       this.onMessage.bind(this) as (this: WebSocket, data: RawData, isBinary: boolean) => void
 748     );
 749     // Handle WebSocket error
 750     this.wsConnection.on(
 751       'error',
 752       this.onError.bind(this) as (this: WebSocket, error: Error) => void
 753     );
 754     // Handle WebSocket close
 755     this.wsConnection.on(
 756       'close',
 757       this.onClose.bind(this) as (this: WebSocket, code: number, reason: Buffer) => void
 758     );
 759     // Handle WebSocket open
 760     this.wsConnection.on('open', this.onOpen.bind(this) as (this: WebSocket) => void);
 761     // Handle WebSocket ping
 762     this.wsConnection.on('ping', this.onPing.bind(this) as (this: WebSocket, data: Buffer) => void);
 763     // Handle WebSocket pong
 764     this.wsConnection.on('pong', this.onPong.bind(this) as (this: WebSocket, data: Buffer) => void);
 765   }
 766
 767   public closeWSConnection(): void {
 768     if (this.isWebSocketConnectionOpened() === true) {
 769       this.wsConnection?.close();
 770       this.wsConnection = null;
 771     }
 772   }
 773
 774   public startAutomaticTransactionGenerator(
 775     connectorIds?: number[],
 776     automaticTransactionGeneratorConfiguration?: AutomaticTransactionGeneratorConfiguration
 777   ): void {
 778     this.automaticTransactionGenerator = AutomaticTransactionGenerator.getInstance(
 779       automaticTransactionGeneratorConfiguration ??
 780         this.getAutomaticTransactionGeneratorConfigurationFromTemplate(),
 781       this
 782     );
 783     if (Utils.isNotEmptyArray(connectorIds)) {
 784       for (const connectorId of connectorIds) {
 785         this.automaticTransactionGenerator?.startConnector(connectorId);
 786       }
 787     } else {
 788       this.automaticTransactionGenerator?.start();
 789     }
 790     parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
 791   }
 792
 793   public stopAutomaticTransactionGenerator(connectorIds?: number[]): void {
 794     if (Utils.isNotEmptyArray(connectorIds)) {
 795       for (const connectorId of connectorIds) {
 796         this.automaticTransactionGenerator?.stopConnector(connectorId);
 797       }
 798     } else {
 799       this.automaticTransactionGenerator?.stop();
 800     }
 801     parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
 802   }
 803
 804   public async stopTransactionOnConnector(
 805     connectorId: number,
 806     reason = StopTransactionReason.NONE
 807   ): Promise<StopTransactionResponse> {
 808     const transactionId = this.getConnectorStatus(connectorId)?.transactionId;
 809     if (
 810       this.getBeginEndMeterValues() === true &&
 811       this.getOcppStrictCompliance() === true &&
 812       this.getOutOfOrderEndMeterValues() === false
 813     ) {
 814       // FIXME: Implement OCPP version agnostic helpers
 815       const transactionEndMeterValue = OCPP16ServiceUtils.buildTransactionEndMeterValue(
 816         this,
 817         connectorId,
 818         this.getEnergyActiveImportRegisterByTransactionId(transactionId)
 819       );
 820       await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
 821         this,
 822         RequestCommand.METER_VALUES,
 823         {
 824           connectorId,
 825           transactionId,
 826           meterValue: [transactionEndMeterValue],
 827         }
 828       );
 829     }
 830     return this.ocppRequestService.requestHandler<StopTransactionRequest, StopTransactionResponse>(
 831       this,
 832       RequestCommand.STOP_TRANSACTION,
 833       {
 834         transactionId,
 835         meterStop: this.getEnergyActiveImportRegisterByTransactionId(transactionId, true),
 836         reason,
 837       }
 838     );
 839   }
 840
 841   private flushMessageBuffer(): void {
 842     if (this.messageBuffer.size > 0) {
 843       for (const message of this.messageBuffer.values()) {
 844         let beginId: string;
 845         let commandName: RequestCommand;
 846         const [messageType] = JSON.parse(message) as OutgoingRequest | Response | ErrorResponse;
 847         const isRequest = messageType === MessageType.CALL_MESSAGE;
 848         if (isRequest) {
 849           [, , commandName] = JSON.parse(message) as OutgoingRequest;
 850           beginId = PerformanceStatistics.beginMeasure(commandName);
 851         }
 852         this.wsConnection?.send(message);
 853         isRequest && PerformanceStatistics.endMeasure(commandName, beginId);
 854         logger.debug(
 855           `${this.logPrefix()} >> Buffered ${OCPPServiceUtils.getMessageTypeString(
 856             messageType
 857           )} payload sent: ${message}`
 858         );
 859         this.messageBuffer.delete(message);
 860       }
 861     }
 862   }
 863
 864   private getSupervisionUrlOcppConfiguration(): boolean {
 865     return this.stationInfo.supervisionUrlOcppConfiguration ?? false;
 866   }
 867
 868   private getSupervisionUrlOcppKey(): string {
 869     return this.stationInfo.supervisionUrlOcppKey ?? VendorParametersKey.ConnectionUrl;
 870   }
 871
 872   private getTemplateFromFile(): ChargingStationTemplate | undefined {
 873     let template: ChargingStationTemplate;
 874     try {
 875       if (this.sharedLRUCache.hasChargingStationTemplate(this.stationInfo?.templateHash)) {
 876         template = this.sharedLRUCache.getChargingStationTemplate(this.stationInfo.templateHash);
 877       } else {
 878         const measureId = `${FileType.ChargingStationTemplate} read`;
 879         const beginId = PerformanceStatistics.beginMeasure(measureId);
 880         template = JSON.parse(
 881           fs.readFileSync(this.templateFile, 'utf8')
 882         ) as ChargingStationTemplate;
 883         PerformanceStatistics.endMeasure(measureId, beginId);
 884         template.templateHash = crypto
 885           .createHash(Constants.DEFAULT_HASH_ALGORITHM)
 886           .update(JSON.stringify(template))
 887           .digest('hex');
 888         this.sharedLRUCache.setChargingStationTemplate(template);
 889       }
 890     } catch (error) {
 891       FileUtils.handleFileException(
 892         this.templateFile,
 893         FileType.ChargingStationTemplate,
 894         error as NodeJS.ErrnoException,
 895         this.logPrefix()
 896       );
 897     }
 898     return template;
 899   }
 900
 901   private getStationInfoFromTemplate(): ChargingStationInfo {
 902     const stationTemplate: ChargingStationTemplate | undefined = this.getTemplateFromFile();
 903     if (Utils.isNullOrUndefined(stationTemplate)) {
 904       const errorMsg = `Failed to read charging station template file ${this.templateFile}`;
 905       logger.error(`${this.logPrefix()} ${errorMsg}`);
 906       throw new BaseError(errorMsg);
 907     }
 908     if (Utils.isEmptyObject(stationTemplate)) {
 909       const errorMsg = `Empty charging station information from template file ${this.templateFile}`;
 910       logger.error(`${this.logPrefix()} ${errorMsg}`);
 911       throw new BaseError(errorMsg);
 912     }
 913     ChargingStationUtils.warnTemplateKeysDeprecation(
 914       this.templateFile,
 915       stationTemplate,
 916       this.logPrefix()
 917     );
 918     const stationInfo: ChargingStationInfo =
 919       ChargingStationUtils.stationTemplateToStationInfo(stationTemplate);
 920     stationInfo.hashId = ChargingStationUtils.getHashId(this.index, stationTemplate);
 921     stationInfo.chargingStationId = ChargingStationUtils.getChargingStationId(
 922       this.index,
 923       stationTemplate
 924     );
 925     stationInfo.ocppVersion = stationTemplate?.ocppVersion ?? OCPPVersion.VERSION_16;
 926     ChargingStationUtils.createSerialNumber(stationTemplate, stationInfo);
 927     if (Utils.isNotEmptyArray(stationTemplate?.power)) {
 928       stationTemplate.power = stationTemplate.power as number[];
 929       const powerArrayRandomIndex = Math.floor(Utils.secureRandom() * stationTemplate.power.length);
 930       stationInfo.maximumPower =
 931         stationTemplate?.powerUnit === PowerUnits.KILO_WATT
 932           ? stationTemplate.power[powerArrayRandomIndex] * 1000
 933           : stationTemplate.power[powerArrayRandomIndex];
 934     } else {
 935       stationTemplate.power = stationTemplate?.power as number;
 936       stationInfo.maximumPower =
 937         stationTemplate?.powerUnit === PowerUnits.KILO_WATT
 938           ? stationTemplate.power * 1000
 939           : stationTemplate.power;
 940     }
 941     stationInfo.firmwareVersionPattern =
 942       stationTemplate?.firmwareVersionPattern ?? Constants.SEMVER_PATTERN;
 943     if (
 944       Utils.isNotEmptyString(stationInfo.firmwareVersion) &&
 945       new RegExp(stationInfo.firmwareVersionPattern).test(stationInfo.firmwareVersion) === false
 946     ) {
 947       logger.warn(
 948         `${this.logPrefix()} Firmware version '${stationInfo.firmwareVersion}' in template file ${
 949           this.templateFile
 950         } does not match firmware version pattern '${stationInfo.firmwareVersionPattern}'`
 951       );
 952     }
 953     stationInfo.firmwareUpgrade = merge<FirmwareUpgrade>(
 954       {
 955         versionUpgrade: {
 956           step: 1,
 957         },
 958         reset: true,
 959       },
 960       stationTemplate?.firmwareUpgrade ?? {}
 961     );
 962     stationInfo.resetTime = !Utils.isNullOrUndefined(stationTemplate?.resetTime)
 963       ? stationTemplate.resetTime * 1000
 964       : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
 965     // Initialize evses or connectors if needed (FIXME: should be factored out)
 966     this.initializeConnectorsOrEvses(stationInfo);
 967     stationInfo.maximumAmperage = this.getMaximumAmperage(stationInfo);
 968     ChargingStationUtils.createStationInfoHash(stationInfo);
 969     return stationInfo;
 970   }
 971
 972   private getStationInfoFromFile(): ChargingStationInfo | undefined {
 973     let stationInfo: ChargingStationInfo | undefined;
 974     this.getStationInfoPersistentConfiguration() &&
 975       (stationInfo = this.getConfigurationFromFile()?.stationInfo);
 976     stationInfo && ChargingStationUtils.createStationInfoHash(stationInfo);
 977     return stationInfo;
 978   }
 979
 980   private getStationInfo(): ChargingStationInfo {
 981     const stationInfoFromTemplate: ChargingStationInfo = this.getStationInfoFromTemplate();
 982     const stationInfoFromFile: ChargingStationInfo | undefined = this.getStationInfoFromFile();
 983     // Priority:
 984     // 1. charging station info from template
 985     // 2. charging station info from configuration file
 986     // 3. charging station info attribute
 987     if (stationInfoFromFile?.templateHash === stationInfoFromTemplate.templateHash) {
 988       if (this.stationInfo?.infoHash === stationInfoFromFile?.infoHash) {
 989         return this.stationInfo;
 990       }
 991       return stationInfoFromFile;
 992     }
 993     stationInfoFromFile &&
 994       ChargingStationUtils.propagateSerialNumber(
 995         this.getTemplateFromFile(),
 996         stationInfoFromFile,
 997         stationInfoFromTemplate
 998       );
 999     return stationInfoFromTemplate;
1000   }
1001
1002   private saveStationInfo(): void {
1003     if (this.getStationInfoPersistentConfiguration()) {
1004       this.saveConfiguration({ ocppConfiguration: false, connectors: false, evses: false });
1005     }
1006   }
1007
1008   private getOcppPersistentConfiguration(): boolean {
1009     return this.stationInfo?.ocppPersistentConfiguration ?? true;
1010   }
1011
1012   private getStationInfoPersistentConfiguration(): boolean {
1013     return this.stationInfo?.stationInfoPersistentConfiguration ?? true;
1014   }
1015
1016   private handleUnsupportedVersion(version: OCPPVersion) {
1017     const errMsg = `Unsupported protocol version '${version}' configured in template file ${this.templateFile}`;
1018     logger.error(`${this.logPrefix()} ${errMsg}`);
1019     throw new BaseError(errMsg);
1020   }
1021
1022   private initialize(): void {
1023     this.configurationFile = path.join(
1024       path.dirname(this.templateFile.replace('station-templates', 'configurations')),
1025       `${ChargingStationUtils.getHashId(this.index, this.getTemplateFromFile())}.json`
1026     );
1027     this.stationInfo = this.getStationInfo();
1028     if (
1029       this.stationInfo.firmwareStatus === FirmwareStatus.Installing &&
1030       Utils.isNotEmptyString(this.stationInfo.firmwareVersion) &&
1031       Utils.isNotEmptyString(this.stationInfo.firmwareVersionPattern)
1032     ) {
1033       const patternGroup: number | undefined =
1034         this.stationInfo.firmwareUpgrade?.versionUpgrade?.patternGroup ??
1035         this.stationInfo.firmwareVersion?.split('.').length;
1036       const match = this.stationInfo?.firmwareVersion
1037         ?.match(new RegExp(this.stationInfo.firmwareVersionPattern))
1038         ?.slice(1, patternGroup + 1);
1039       const patchLevelIndex = match.length - 1;
1040       match[patchLevelIndex] = (
1041         Utils.convertToInt(match[patchLevelIndex]) +
1042         this.stationInfo.firmwareUpgrade?.versionUpgrade?.step
1043       ).toString();
1044       this.stationInfo.firmwareVersion = match?.join('.');
1045     }
1046     this.saveStationInfo();
1047     // Avoid duplication of connectors or evses related information in RAM
1048     delete this.stationInfo?.Connectors;
1049     delete this.stationInfo?.Evses;
1050     this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl();
1051     if (this.getEnableStatistics() === true) {
1052       this.performanceStatistics = PerformanceStatistics.getInstance(
1053         this.stationInfo.hashId,
1054         this.stationInfo.chargingStationId,
1055         this.configuredSupervisionUrl
1056       );
1057     }
1058     this.bootNotificationRequest = ChargingStationUtils.createBootNotificationRequest(
1059       this.stationInfo
1060     );
1061     this.powerDivider = this.getPowerDivider();
1062     // OCPP configuration
1063     this.ocppConfiguration = this.getOcppConfiguration();
1064     this.initializeOcppConfiguration();
1065     this.initializeOcppServices();
1066     if (this.stationInfo?.autoRegister === true) {
1067       this.bootNotificationResponse = {
1068         currentTime: new Date(),
1069         interval: this.getHeartbeatInterval() / 1000,
1070         status: RegistrationStatusEnumType.ACCEPTED,
1071       };
1072     }
1073   }
1074
1075   private initializeOcppServices(): void {
1076     const ocppVersion = this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16;
1077     switch (ocppVersion) {
1078       case OCPPVersion.VERSION_16:
1079         this.ocppIncomingRequestService =
1080           OCPP16IncomingRequestService.getInstance<OCPP16IncomingRequestService>();
1081         this.ocppRequestService = OCPP16RequestService.getInstance<OCPP16RequestService>(
1082           OCPP16ResponseService.getInstance<OCPP16ResponseService>()
1083         );
1084         break;
1085       case OCPPVersion.VERSION_20:
1086       case OCPPVersion.VERSION_201:
1087         this.ocppIncomingRequestService =
1088           OCPP20IncomingRequestService.getInstance<OCPP20IncomingRequestService>();
1089         this.ocppRequestService = OCPP20RequestService.getInstance<OCPP20RequestService>(
1090           OCPP20ResponseService.getInstance<OCPP20ResponseService>()
1091         );
1092         break;
1093       default:
1094         this.handleUnsupportedVersion(ocppVersion);
1095         break;
1096     }
1097   }
1098
1099   private initializeOcppConfiguration(): void {
1100     if (
1101       !ChargingStationConfigurationUtils.getConfigurationKey(
1102         this,
1103         StandardParametersKey.HeartbeatInterval
1104       )
1105     ) {
1106       ChargingStationConfigurationUtils.addConfigurationKey(
1107         this,
1108         StandardParametersKey.HeartbeatInterval,
1109         '0'
1110       );
1111     }
1112     if (
1113       !ChargingStationConfigurationUtils.getConfigurationKey(
1114         this,
1115         StandardParametersKey.HeartBeatInterval
1116       )
1117     ) {
1118       ChargingStationConfigurationUtils.addConfigurationKey(
1119         this,
1120         StandardParametersKey.HeartBeatInterval,
1121         '0',
1122         { visible: false }
1123       );
1124     }
1125     if (
1126       this.getSupervisionUrlOcppConfiguration() &&
1127       Utils.isNotEmptyString(this.getSupervisionUrlOcppKey()) &&
1128       !ChargingStationConfigurationUtils.getConfigurationKey(this, this.getSupervisionUrlOcppKey())
1129     ) {
1130       ChargingStationConfigurationUtils.addConfigurationKey(
1131         this,
1132         this.getSupervisionUrlOcppKey(),
1133         this.configuredSupervisionUrl.href,
1134         { reboot: true }
1135       );
1136     } else if (
1137       !this.getSupervisionUrlOcppConfiguration() &&
1138       Utils.isNotEmptyString(this.getSupervisionUrlOcppKey()) &&
1139       ChargingStationConfigurationUtils.getConfigurationKey(this, this.getSupervisionUrlOcppKey())
1140     ) {
1141       ChargingStationConfigurationUtils.deleteConfigurationKey(
1142         this,
1143         this.getSupervisionUrlOcppKey(),
1144         { save: false }
1145       );
1146     }
1147     if (
1148       Utils.isNotEmptyString(this.stationInfo?.amperageLimitationOcppKey) &&
1149       !ChargingStationConfigurationUtils.getConfigurationKey(
1150         this,
1151         this.stationInfo.amperageLimitationOcppKey
1152       )
1153     ) {
1154       ChargingStationConfigurationUtils.addConfigurationKey(
1155         this,
1156         this.stationInfo.amperageLimitationOcppKey,
1157         (
1158           this.stationInfo.maximumAmperage *
1159           ChargingStationUtils.getAmperageLimitationUnitDivider(this.stationInfo)
1160         ).toString()
1161       );
1162     }
1163     if (
1164       !ChargingStationConfigurationUtils.getConfigurationKey(
1165         this,
1166         StandardParametersKey.SupportedFeatureProfiles
1167       )
1168     ) {
1169       ChargingStationConfigurationUtils.addConfigurationKey(
1170         this,
1171         StandardParametersKey.SupportedFeatureProfiles,
1172         `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.FirmwareManagement},${SupportedFeatureProfiles.LocalAuthListManagement},${SupportedFeatureProfiles.SmartCharging},${SupportedFeatureProfiles.RemoteTrigger}`
1173       );
1174     }
1175     ChargingStationConfigurationUtils.addConfigurationKey(
1176       this,
1177       StandardParametersKey.NumberOfConnectors,
1178       this.getNumberOfConnectors().toString(),
1179       { readonly: true },
1180       { overwrite: true }
1181     );
1182     if (
1183       !ChargingStationConfigurationUtils.getConfigurationKey(
1184         this,
1185         StandardParametersKey.MeterValuesSampledData
1186       )
1187     ) {
1188       ChargingStationConfigurationUtils.addConfigurationKey(
1189         this,
1190         StandardParametersKey.MeterValuesSampledData,
1191         MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
1192       );
1193     }
1194     if (
1195       !ChargingStationConfigurationUtils.getConfigurationKey(
1196         this,
1197         StandardParametersKey.ConnectorPhaseRotation
1198       )
1199     ) {
1200       const connectorPhaseRotation = [];
1201       if (this.hasEvses) {
1202         for (const evseStatus of this.evses.values()) {
1203           for (const connectorId of evseStatus.connectors.keys()) {
1204             // AC/DC
1205             if (connectorId === 0 && this.getNumberOfPhases() === 0) {
1206               connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
1207             } else if (connectorId > 0 && this.getNumberOfPhases() === 0) {
1208               connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
1209               // AC
1210             } else if (connectorId > 0 && this.getNumberOfPhases() === 1) {
1211               connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
1212             } else if (connectorId > 0 && this.getNumberOfPhases() === 3) {
1213               connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
1214             }
1215           }
1216         }
1217       } else {
1218         for (const connectorId of this.connectors.keys()) {
1219           // AC/DC
1220           if (connectorId === 0 && this.getNumberOfPhases() === 0) {
1221             connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
1222           } else if (connectorId > 0 && this.getNumberOfPhases() === 0) {
1223             connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
1224             // AC
1225           } else if (connectorId > 0 && this.getNumberOfPhases() === 1) {
1226             connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
1227           } else if (connectorId > 0 && this.getNumberOfPhases() === 3) {
1228             connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
1229           }
1230         }
1231       }
1232       ChargingStationConfigurationUtils.addConfigurationKey(
1233         this,
1234         StandardParametersKey.ConnectorPhaseRotation,
1235         connectorPhaseRotation.toString()
1236       );
1237     }
1238     if (
1239       !ChargingStationConfigurationUtils.getConfigurationKey(
1240         this,
1241         StandardParametersKey.AuthorizeRemoteTxRequests
1242       )
1243     ) {
1244       ChargingStationConfigurationUtils.addConfigurationKey(
1245         this,
1246         StandardParametersKey.AuthorizeRemoteTxRequests,
1247         'true'
1248       );
1249     }
1250     if (
1251       !ChargingStationConfigurationUtils.getConfigurationKey(
1252         this,
1253         StandardParametersKey.LocalAuthListEnabled
1254       ) &&
1255       ChargingStationConfigurationUtils.getConfigurationKey(
1256         this,
1257         StandardParametersKey.SupportedFeatureProfiles
1258       )?.value?.includes(SupportedFeatureProfiles.LocalAuthListManagement)
1259     ) {
1260       ChargingStationConfigurationUtils.addConfigurationKey(
1261         this,
1262         StandardParametersKey.LocalAuthListEnabled,
1263         'false'
1264       );
1265     }
1266     if (
1267       !ChargingStationConfigurationUtils.getConfigurationKey(
1268         this,
1269         StandardParametersKey.ConnectionTimeOut
1270       )
1271     ) {
1272       ChargingStationConfigurationUtils.addConfigurationKey(
1273         this,
1274         StandardParametersKey.ConnectionTimeOut,
1275         Constants.DEFAULT_CONNECTION_TIMEOUT.toString()
1276       );
1277     }
1278     this.saveOcppConfiguration();
1279   }
1280
1281   private initializeConnectorsOrEvses(stationInfo: ChargingStationInfo) {
1282     if (stationInfo?.Connectors && !stationInfo?.Evses) {
1283       this.initializeConnectors(stationInfo);
1284     } else if (stationInfo?.Evses && !stationInfo?.Connectors) {
1285       this.initializeEvses(stationInfo);
1286     } else if (stationInfo?.Evses && stationInfo?.Connectors) {
1287       const errorMsg = `Connectors and evses defined at the same time in template file ${this.templateFile}`;
1288       logger.error(`${this.logPrefix()} ${errorMsg}`);
1289       throw new BaseError(errorMsg);
1290     } else {
1291       const errorMsg = `No connectors or evses defined in template file ${this.templateFile}`;
1292       logger.error(`${this.logPrefix()} ${errorMsg}`);
1293       throw new BaseError(errorMsg);
1294     }
1295   }
1296
1297   private initializeConnectors(stationInfo: ChargingStationInfo): void {
1298     if (!stationInfo?.Connectors && this.connectors.size === 0) {
1299       const logMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`;
1300       logger.error(`${this.logPrefix()} ${logMsg}`);
1301       throw new BaseError(logMsg);
1302     }
1303     if (!stationInfo?.Connectors[0]) {
1304       logger.warn(
1305         `${this.logPrefix()} Charging station information from template ${
1306           this.templateFile
1307         } with no connector id 0 configuration`
1308       );
1309     }
1310     if (stationInfo?.Connectors) {
1311       const configuredMaxConnectors =
1312         ChargingStationUtils.getConfiguredNumberOfConnectors(stationInfo);
1313       ChargingStationUtils.checkConfiguredMaxConnectors(
1314         configuredMaxConnectors,
1315         this.templateFile,
1316         this.logPrefix()
1317       );
1318       const connectorsConfigHash = crypto
1319         .createHash(Constants.DEFAULT_HASH_ALGORITHM)
1320         .update(`${JSON.stringify(stationInfo?.Connectors)}${configuredMaxConnectors.toString()}`)
1321         .digest('hex');
1322       const connectorsConfigChanged =
1323         this.connectors?.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash;
1324       if (this.connectors?.size === 0 || connectorsConfigChanged) {
1325         connectorsConfigChanged && this.connectors.clear();
1326         this.connectorsConfigurationHash = connectorsConfigHash;
1327         const templateMaxConnectors = ChargingStationUtils.getMaxNumberOfConnectors(
1328           stationInfo.Connectors
1329         );
1330         ChargingStationUtils.checkTemplateMaxConnectors(
1331           templateMaxConnectors,
1332           this.templateFile,
1333           this.logPrefix()
1334         );
1335         const templateMaxAvailableConnectors = stationInfo?.Connectors[0]
1336           ? templateMaxConnectors - 1
1337           : templateMaxConnectors;
1338         if (
1339           configuredMaxConnectors > templateMaxAvailableConnectors &&
1340           !stationInfo?.randomConnectors
1341         ) {
1342           logger.warn(
1343             `${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${
1344               this.templateFile
1345             }, forcing random connector configurations affectation`
1346           );
1347           stationInfo.randomConnectors = true;
1348         }
1349         if (templateMaxConnectors > 0) {
1350           for (let connectorId = 0; connectorId <= configuredMaxConnectors; connectorId++) {
1351             if (
1352               connectorId === 0 &&
1353               (!stationInfo?.Connectors[connectorId] ||
1354                 this.getUseConnectorId0(stationInfo) === false)
1355             ) {
1356               continue;
1357             }
1358             const templateConnectorId =
1359               connectorId > 0 && stationInfo?.randomConnectors
1360                 ? Utils.getRandomInteger(templateMaxAvailableConnectors, 1)
1361                 : connectorId;
1362             const connectorStatus = stationInfo?.Connectors[templateConnectorId];
1363             ChargingStationUtils.checkStationInfoConnectorStatus(
1364               templateConnectorId,
1365               connectorStatus,
1366               this.logPrefix(),
1367               this.templateFile
1368             );
1369             this.connectors.set(connectorId, Utils.cloneObject<ConnectorStatus>(connectorStatus));
1370           }
1371           ChargingStationUtils.initializeConnectorsMapStatus(this.connectors, this.logPrefix());
1372           this.saveConnectorsStatus();
1373         } else {
1374           logger.warn(
1375             `${this.logPrefix()} Charging station information from template ${
1376               this.templateFile
1377             } with no connectors configuration defined, cannot create connectors`
1378           );
1379         }
1380       }
1381     } else {
1382       logger.warn(
1383         `${this.logPrefix()} Charging station information from template ${
1384           this.templateFile
1385         } with no connectors configuration defined, using already defined connectors`
1386       );
1387     }
1388   }
1389
1390   private initializeEvses(stationInfo: ChargingStationInfo): void {
1391     if (!stationInfo?.Evses && this.evses.size === 0) {
1392       const logMsg = `No already defined evses and charging station information from template ${this.templateFile} with no evses configuration defined`;
1393       logger.error(`${this.logPrefix()} ${logMsg}`);
1394       throw new BaseError(logMsg);
1395     }
1396     if (!stationInfo?.Evses[0]) {
1397       logger.warn(
1398         `${this.logPrefix()} Charging station information from template ${
1399           this.templateFile
1400         } with no evse id 0 configuration`
1401       );
1402     }
1403     if (!stationInfo?.Evses[0]?.Connectors[0]) {
1404       logger.warn(
1405         `${this.logPrefix()} Charging station information from template ${
1406           this.templateFile
1407         } with evse id 0 with no connector id 0 configuration`
1408       );
1409     }
1410     if (stationInfo?.Evses) {
1411       const evsesConfigHash = crypto
1412         .createHash(Constants.DEFAULT_HASH_ALGORITHM)
1413         .update(`${JSON.stringify(stationInfo?.Evses)}`)
1414         .digest('hex');
1415       const evsesConfigChanged =
1416         this.evses?.size !== 0 && this.evsesConfigurationHash !== evsesConfigHash;
1417       if (this.evses?.size === 0 || evsesConfigChanged) {
1418         evsesConfigChanged && this.evses.clear();
1419         this.evsesConfigurationHash = evsesConfigHash;
1420         const templateMaxEvses = ChargingStationUtils.getMaxNumberOfEvses(stationInfo?.Evses);
1421         if (templateMaxEvses > 0) {
1422           for (const evse in stationInfo.Evses) {
1423             const evseId = Utils.convertToInt(evse);
1424             this.evses.set(evseId, {
1425               connectors: ChargingStationUtils.buildConnectorsMap(
1426                 stationInfo?.Evses[evse]?.Connectors,
1427                 this.logPrefix(),
1428                 this.templateFile
1429               ),
1430               availability: AvailabilityType.Operative,
1431             });
1432             ChargingStationUtils.initializeConnectorsMapStatus(
1433               this.evses.get(evseId)?.connectors,
1434               this.logPrefix()
1435             );
1436           }
1437           this.saveEvsesStatus();
1438         } else {
1439           logger.warn(
1440             `${this.logPrefix()} Charging station information from template ${
1441               this.templateFile
1442             } with no evses configuration defined, cannot create evses`
1443           );
1444         }
1445       }
1446     } else {
1447       logger.warn(
1448         `${this.logPrefix()} Charging station information from template ${
1449           this.templateFile
1450         } with no evses configuration defined, using already defined evses`
1451       );
1452     }
1453   }
1454
1455   private getConfigurationFromFile(): ChargingStationConfiguration | undefined {
1456     let configuration: ChargingStationConfiguration | undefined;
1457     if (this.configurationFile && fs.existsSync(this.configurationFile)) {
1458       try {
1459         if (this.sharedLRUCache.hasChargingStationConfiguration(this.configurationFileHash)) {
1460           configuration = this.sharedLRUCache.getChargingStationConfiguration(
1461             this.configurationFileHash
1462           );
1463         } else {
1464           const measureId = `${FileType.ChargingStationConfiguration} read`;
1465           const beginId = PerformanceStatistics.beginMeasure(measureId);
1466           configuration = JSON.parse(
1467             fs.readFileSync(this.configurationFile, 'utf8')
1468           ) as ChargingStationConfiguration;
1469           PerformanceStatistics.endMeasure(measureId, beginId);
1470           this.configurationFileHash = configuration.configurationHash;
1471           this.sharedLRUCache.setChargingStationConfiguration(configuration);
1472         }
1473       } catch (error) {
1474         FileUtils.handleFileException(
1475           this.configurationFile,
1476           FileType.ChargingStationConfiguration,
1477           error as NodeJS.ErrnoException,
1478           this.logPrefix()
1479         );
1480       }
1481     }
1482     return configuration;
1483   }
1484
1485   private saveConnectorsStatus() {
1486     if (this.getOcppPersistentConfiguration()) {
1487       this.saveConfiguration({ stationInfo: false, ocppConfiguration: false, evses: false });
1488     }
1489   }
1490
1491   private saveEvsesStatus() {
1492     if (this.getOcppPersistentConfiguration()) {
1493       this.saveConfiguration({ stationInfo: false, ocppConfiguration: false, connectors: false });
1494     }
1495   }
1496
1497   private saveConfiguration(
1498     params: {
1499       stationInfo?: boolean;
1500       ocppConfiguration?: boolean;
1501       connectors?: boolean;
1502       evses?: boolean;
1503     } = { stationInfo: true, ocppConfiguration: true, connectors: true, evses: true }
1504   ): void {
1505     if (this.configurationFile) {
1506       params = {
1507         ...params,
1508         ...{ stationInfo: true, ocppConfiguration: true, connectors: true, evses: true },
1509       };
1510       try {
1511         if (!fs.existsSync(path.dirname(this.configurationFile))) {
1512           fs.mkdirSync(path.dirname(this.configurationFile), { recursive: true });
1513         }
1514         const configurationData: ChargingStationConfiguration =
1515           Utils.cloneObject(this.getConfigurationFromFile()) ?? {};
1516         if (params.stationInfo && this.stationInfo) {
1517           configurationData.stationInfo = this.stationInfo;
1518         }
1519         if (params.ocppConfiguration && this.ocppConfiguration?.configurationKey) {
1520           configurationData.configurationKey = this.ocppConfiguration.configurationKey;
1521         }
1522         if (params.connectors && this.connectors.size > 0) {
1523           configurationData.connectorsStatus = [...this.connectors.values()].map(
1524             // eslint-disable-next-line @typescript-eslint/no-unused-vars
1525             ({ transactionSetInterval, ...connectorStatusRest }) => connectorStatusRest
1526           );
1527         }
1528         if (params.evses && this.evses.size > 0) {
1529           configurationData.evsesStatus = [...this.evses.values()].map((evseStatus) => {
1530             const status = {
1531               ...evseStatus,
1532               connectorsStatus: [...evseStatus.connectors.values()].map(
1533                 // eslint-disable-next-line @typescript-eslint/no-unused-vars
1534                 ({ transactionSetInterval, ...connectorStatusRest }) => connectorStatusRest
1535               ),
1536             };
1537             delete status.connectors;
1538             return status as EvseStatusConfiguration;
1539           });
1540         }
1541         delete configurationData.configurationHash;
1542         const configurationHash = crypto
1543           .createHash(Constants.DEFAULT_HASH_ALGORITHM)
1544           .update(JSON.stringify(configurationData))
1545           .digest('hex');
1546         if (this.configurationFileHash !== configurationHash) {
1547           configurationData.configurationHash = configurationHash;
1548           const measureId = `${FileType.ChargingStationConfiguration} write`;
1549           const beginId = PerformanceStatistics.beginMeasure(measureId);
1550           const fileDescriptor = fs.openSync(this.configurationFile, 'w');
1551           fs.writeFileSync(fileDescriptor, JSON.stringify(configurationData, null, 2), 'utf8');
1552           fs.closeSync(fileDescriptor);
1553           PerformanceStatistics.endMeasure(measureId, beginId);
1554           this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
1555           this.configurationFileHash = configurationHash;
1556           this.sharedLRUCache.setChargingStationConfiguration(configurationData);
1557         } else {
1558           logger.debug(
1559             `${this.logPrefix()} Not saving unchanged charging station configuration file ${
1560               this.configurationFile
1561             }`
1562           );
1563         }
1564       } catch (error) {
1565         FileUtils.handleFileException(
1566           this.configurationFile,
1567           FileType.ChargingStationConfiguration,
1568           error as NodeJS.ErrnoException,
1569           this.logPrefix()
1570         );
1571       }
1572     } else {
1573       logger.error(
1574         `${this.logPrefix()} Trying to save charging station configuration to undefined configuration file`
1575       );
1576     }
1577   }
1578
1579   private getOcppConfigurationFromTemplate(): ChargingStationOcppConfiguration | undefined {
1580     return this.getTemplateFromFile()?.Configuration;
1581   }
1582
1583   private getOcppConfigurationFromFile(): ChargingStationOcppConfiguration | undefined {
1584     let configuration: ChargingStationConfiguration | undefined;
1585     if (this.getOcppPersistentConfiguration() === true) {
1586       const configurationFromFile = this.getConfigurationFromFile();
1587       configuration = configurationFromFile?.configurationKey && configurationFromFile;
1588     }
1589     if (!Utils.isNullOrUndefined(configuration)) {
1590       delete configuration.stationInfo;
1591       delete configuration.configurationHash;
1592     }
1593     return configuration;
1594   }
1595
1596   private getOcppConfiguration(): ChargingStationOcppConfiguration | undefined {
1597     let ocppConfiguration: ChargingStationOcppConfiguration | undefined =
1598       this.getOcppConfigurationFromFile();
1599     if (!ocppConfiguration) {
1600       ocppConfiguration = this.getOcppConfigurationFromTemplate();
1601     }
1602     return ocppConfiguration;
1603   }
1604
1605   private async onOpen(): Promise<void> {
1606     if (this.isWebSocketConnectionOpened() === true) {
1607       logger.info(
1608         `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} succeeded`
1609       );
1610       if (this.isRegistered() === false) {
1611         // Send BootNotification
1612         let registrationRetryCount = 0;
1613         do {
1614           this.bootNotificationResponse = await this.ocppRequestService.requestHandler<
1615             BootNotificationRequest,
1616             BootNotificationResponse
1617           >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
1618             skipBufferingOnError: true,
1619           });
1620           if (this.isRegistered() === false) {
1621             this.getRegistrationMaxRetries() !== -1 && registrationRetryCount++;
1622             await Utils.sleep(
1623               this?.bootNotificationResponse?.interval
1624                 ? this.bootNotificationResponse.interval * 1000
1625                 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL
1626             );
1627           }
1628         } while (
1629           this.isRegistered() === false &&
1630           (registrationRetryCount <= this.getRegistrationMaxRetries() ||
1631             this.getRegistrationMaxRetries() === -1)
1632         );
1633       }
1634       if (this.isRegistered() === true) {
1635         if (this.isInAcceptedState() === true) {
1636           await this.startMessageSequence();
1637         }
1638       } else {
1639         logger.error(
1640           `${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`
1641         );
1642       }
1643       this.wsConnectionRestarted = false;
1644       this.autoReconnectRetryCount = 0;
1645       parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
1646     } else {
1647       logger.warn(
1648         `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} failed`
1649       );
1650     }
1651   }
1652
1653   private async onClose(code: number, reason: Buffer): Promise<void> {
1654     switch (code) {
1655       // Normal close
1656       case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
1657       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
1658         logger.info(
1659           `${this.logPrefix()} WebSocket normally closed with status '${Utils.getWebSocketCloseEventStatusString(
1660             code
1661           )}' and reason '${reason.toString()}'`
1662         );
1663         this.autoReconnectRetryCount = 0;
1664         break;
1665       // Abnormal close
1666       default:
1667         logger.error(
1668           `${this.logPrefix()} WebSocket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(
1669             code
1670           )}' and reason '${reason.toString()}'`
1671         );
1672         this.started === true && (await this.reconnect());
1673         break;
1674     }
1675     parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
1676   }
1677
1678   private getCachedRequest(messageType: MessageType, messageId: string): CachedRequest | undefined {
1679     const cachedRequest = this.requests.get(messageId);
1680     if (Array.isArray(cachedRequest) === true) {
1681       return cachedRequest;
1682     }
1683     throw new OCPPError(
1684       ErrorType.PROTOCOL_ERROR,
1685       `Cached request for message id ${messageId} ${OCPPServiceUtils.getMessageTypeString(
1686         messageType
1687       )} is not an array`,
1688       undefined,
1689       cachedRequest as JsonType
1690     );
1691   }
1692
1693   private async handleIncomingMessage(request: IncomingRequest): Promise<void> {
1694     const [messageType, messageId, commandName, commandPayload] = request;
1695     if (this.getEnableStatistics() === true) {
1696       this.performanceStatistics?.addRequestStatistic(commandName, messageType);
1697     }
1698     logger.debug(
1699       `${this.logPrefix()} << Command '${commandName}' received request payload: ${JSON.stringify(
1700         request
1701       )}`
1702     );
1703     // Process the message
1704     await this.ocppIncomingRequestService.incomingRequestHandler(
1705       this,
1706       messageId,
1707       commandName,
1708       commandPayload
1709     );
1710   }
1711
1712   private handleResponseMessage(response: Response): void {
1713     const [messageType, messageId, commandPayload] = response;
1714     if (this.requests.has(messageId) === false) {
1715       // Error
1716       throw new OCPPError(
1717         ErrorType.INTERNAL_ERROR,
1718         `Response for unknown message id ${messageId}`,
1719         undefined,
1720         commandPayload
1721       );
1722     }
1723     // Respond
1724     const [responseCallback, , requestCommandName, requestPayload] = this.getCachedRequest(
1725       messageType,
1726       messageId
1727     );
1728     logger.debug(
1729       `${this.logPrefix()} << Command '${
1730         requestCommandName ?? Constants.UNKNOWN_COMMAND
1731       }' received response payload: ${JSON.stringify(response)}`
1732     );
1733     responseCallback(commandPayload, requestPayload);
1734   }
1735
1736   private handleErrorMessage(errorResponse: ErrorResponse): void {
1737     const [messageType, messageId, errorType, errorMessage, errorDetails] = errorResponse;
1738     if (this.requests.has(messageId) === false) {
1739       // Error
1740       throw new OCPPError(
1741         ErrorType.INTERNAL_ERROR,
1742         `Error response for unknown message id ${messageId}`,
1743         undefined,
1744         { errorType, errorMessage, errorDetails }
1745       );
1746     }
1747     const [, errorCallback, requestCommandName] = this.getCachedRequest(messageType, messageId);
1748     logger.debug(
1749       `${this.logPrefix()} << Command '${
1750         requestCommandName ?? Constants.UNKNOWN_COMMAND
1751       }' received error response payload: ${JSON.stringify(errorResponse)}`
1752     );
1753     errorCallback(new OCPPError(errorType, errorMessage, requestCommandName, errorDetails));
1754   }
1755
1756   private async onMessage(data: RawData): Promise<void> {
1757     let request: IncomingRequest | Response | ErrorResponse;
1758     let messageType: number;
1759     let errMsg: string;
1760     try {
1761       request = JSON.parse(data.toString()) as IncomingRequest | Response | ErrorResponse;
1762       if (Array.isArray(request) === true) {
1763         [messageType] = request;
1764         // Check the type of message
1765         switch (messageType) {
1766           // Incoming Message
1767           case MessageType.CALL_MESSAGE:
1768             await this.handleIncomingMessage(request as IncomingRequest);
1769             break;
1770           // Response Message
1771           case MessageType.CALL_RESULT_MESSAGE:
1772             this.handleResponseMessage(request as Response);
1773             break;
1774           // Error Message
1775           case MessageType.CALL_ERROR_MESSAGE:
1776             this.handleErrorMessage(request as ErrorResponse);
1777             break;
1778           // Unknown Message
1779           default:
1780             // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
1781             errMsg = `Wrong message type ${messageType}`;
1782             logger.error(`${this.logPrefix()} ${errMsg}`);
1783             throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg);
1784         }
1785         parentPort?.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
1786       } else {
1787         throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming message is not an array', null, {
1788           request,
1789         });
1790       }
1791     } catch (error) {
1792       let commandName: IncomingRequestCommand;
1793       let requestCommandName: RequestCommand | IncomingRequestCommand;
1794       let errorCallback: ErrorCallback;
1795       const [, messageId] = request;
1796       switch (messageType) {
1797         case MessageType.CALL_MESSAGE:
1798           [, , commandName] = request as IncomingRequest;
1799           // Send error
1800           await this.ocppRequestService.sendError(this, messageId, error as OCPPError, commandName);
1801           break;
1802         case MessageType.CALL_RESULT_MESSAGE:
1803         case MessageType.CALL_ERROR_MESSAGE:
1804           if (this.requests.has(messageId) === true) {
1805             [, errorCallback, requestCommandName] = this.getCachedRequest(messageType, messageId);
1806             // Reject the deferred promise in case of error at response handling (rejecting an already fulfilled promise is a no-op)
1807             errorCallback(error as OCPPError, false);
1808           } else {
1809             // Remove the request from the cache in case of error at response handling
1810             this.requests.delete(messageId);
1811           }
1812           break;
1813       }
1814       if (error instanceof OCPPError === false) {
1815         logger.warn(
1816           `${this.logPrefix()} Error thrown at incoming OCPP command '${
1817             commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
1818           }' message '${data.toString()}' handling is not an OCPPError:`,
1819           error
1820         );
1821       }
1822       logger.error(
1823         `${this.logPrefix()} Incoming OCPP command '${
1824           commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
1825         }' message '${data.toString()}'${
1826           messageType !== MessageType.CALL_MESSAGE
1827             ? ` matching cached request '${JSON.stringify(this.requests.get(messageId))}'`
1828             : ''
1829         } processing error:`,
1830         error
1831       );
1832     }
1833   }
1834
1835   private onPing(): void {
1836     logger.debug(`${this.logPrefix()} Received a WS ping (rfc6455) from the server`);
1837   }
1838
1839   private onPong(): void {
1840     logger.debug(`${this.logPrefix()} Received a WS pong (rfc6455) from the server`);
1841   }
1842
1843   private onError(error: WSError): void {
1844     this.closeWSConnection();
1845     logger.error(`${this.logPrefix()} WebSocket error:`, error);
1846   }
1847
1848   private getEnergyActiveImportRegister(connectorStatus: ConnectorStatus, rounded = false): number {
1849     if (this.getMeteringPerTransaction() === true) {
1850       return (
1851         (rounded === true
1852           ? Math.round(connectorStatus?.transactionEnergyActiveImportRegisterValue)
1853           : connectorStatus?.transactionEnergyActiveImportRegisterValue) ?? 0
1854       );
1855     }
1856     return (
1857       (rounded === true
1858         ? Math.round(connectorStatus?.energyActiveImportRegisterValue)
1859         : connectorStatus?.energyActiveImportRegisterValue) ?? 0
1860     );
1861   }
1862
1863   private getUseConnectorId0(stationInfo?: ChargingStationInfo): boolean {
1864     const localStationInfo = stationInfo ?? this.stationInfo;
1865     return localStationInfo?.useConnectorId0 ?? true;
1866   }
1867
1868   private getNumberOfRunningTransactions(): number {
1869     let trxCount = 0;
1870     if (this.hasEvses) {
1871       for (const evseStatus of this.evses.values()) {
1872         for (const connectorStatus of evseStatus.connectors.values()) {
1873           if (connectorStatus.transactionStarted === true) {
1874             trxCount++;
1875           }
1876         }
1877       }
1878     } else {
1879       for (const connectorId of this.connectors.keys()) {
1880         if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
1881           trxCount++;
1882         }
1883       }
1884     }
1885     return trxCount;
1886   }
1887
1888   private async stopRunningTransactions(reason = StopTransactionReason.NONE): Promise<void> {
1889     if (this.hasEvses) {
1890       for (const evseStatus of this.evses.values()) {
1891         for (const [connectorId, connectorStatus] of evseStatus.connectors) {
1892           if (connectorStatus.transactionStarted === true) {
1893             await this.stopTransactionOnConnector(connectorId, reason);
1894           }
1895         }
1896       }
1897     } else {
1898       for (const connectorId of this.connectors.keys()) {
1899         if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
1900           await this.stopTransactionOnConnector(connectorId, reason);
1901         }
1902       }
1903     }
1904   }
1905
1906   // 0 for disabling
1907   private getConnectionTimeout(): number {
1908     if (
1909       ChargingStationConfigurationUtils.getConfigurationKey(
1910         this,
1911         StandardParametersKey.ConnectionTimeOut
1912       )
1913     ) {
1914       return (
1915         parseInt(
1916           ChargingStationConfigurationUtils.getConfigurationKey(
1917             this,
1918             StandardParametersKey.ConnectionTimeOut
1919           ).value
1920         ) ?? Constants.DEFAULT_CONNECTION_TIMEOUT
1921       );
1922     }
1923     return Constants.DEFAULT_CONNECTION_TIMEOUT;
1924   }
1925
1926   // -1 for unlimited, 0 for disabling
1927   private getAutoReconnectMaxRetries(): number | undefined {
1928     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
1929       return this.stationInfo.autoReconnectMaxRetries;
1930     }
1931     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
1932       return Configuration.getAutoReconnectMaxRetries();
1933     }
1934     return -1;
1935   }
1936
1937   // 0 for disabling
1938   private getRegistrationMaxRetries(): number | undefined {
1939     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
1940       return this.stationInfo.registrationMaxRetries;
1941     }
1942     return -1;
1943   }
1944
1945   private getPowerDivider(): number {
1946     let powerDivider = this.getNumberOfConnectors();
1947     if (this.stationInfo?.powerSharedByConnectors) {
1948       powerDivider = this.getNumberOfRunningTransactions();
1949     }
1950     return powerDivider;
1951   }
1952
1953   private getMaximumAmperage(stationInfo: ChargingStationInfo): number | undefined {
1954     const maximumPower = this.getMaximumPower(stationInfo);
1955     switch (this.getCurrentOutType(stationInfo)) {
1956       case CurrentType.AC:
1957         return ACElectricUtils.amperagePerPhaseFromPower(
1958           this.getNumberOfPhases(stationInfo),
1959           maximumPower / this.getNumberOfConnectors(),
1960           this.getVoltageOut(stationInfo)
1961         );
1962       case CurrentType.DC:
1963         return DCElectricUtils.amperage(maximumPower, this.getVoltageOut(stationInfo));
1964     }
1965   }
1966
1967   private getAmperageLimitation(): number | undefined {
1968     if (
1969       Utils.isNotEmptyString(this.stationInfo?.amperageLimitationOcppKey) &&
1970       ChargingStationConfigurationUtils.getConfigurationKey(
1971         this,
1972         this.stationInfo.amperageLimitationOcppKey
1973       )
1974     ) {
1975       return (
1976         Utils.convertToInt(
1977           ChargingStationConfigurationUtils.getConfigurationKey(
1978             this,
1979             this.stationInfo.amperageLimitationOcppKey
1980           )?.value
1981         ) / ChargingStationUtils.getAmperageLimitationUnitDivider(this.stationInfo)
1982       );
1983     }
1984   }
1985
1986   private async startMessageSequence(): Promise<void> {
1987     if (this.stationInfo?.autoRegister === true) {
1988       await this.ocppRequestService.requestHandler<
1989         BootNotificationRequest,
1990         BootNotificationResponse
1991       >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
1992         skipBufferingOnError: true,
1993       });
1994     }
1995     // Start WebSocket ping
1996     this.startWebSocketPing();
1997     // Start heartbeat
1998     this.startHeartbeat();
1999     // Initialize connectors status
2000     if (this.hasEvses) {
2001       for (const [evseId, evseStatus] of this.evses) {
2002         if (evseId === 0) {
2003           continue;
2004         }
2005         for (const [connectorId, connectorStatus] of evseStatus.connectors) {
2006           const connectorBootStatus = ChargingStationUtils.getBootConnectorStatus(
2007             this,
2008             connectorId,
2009             connectorStatus
2010           );
2011           await OCPPServiceUtils.sendAndSetConnectorStatus(this, connectorId, connectorBootStatus);
2012         }
2013       }
2014     } else {
2015       for (const connectorId of this.connectors.keys()) {
2016         if (connectorId === 0) {
2017           continue;
2018         }
2019         const connectorBootStatus = ChargingStationUtils.getBootConnectorStatus(
2020           this,
2021           connectorId,
2022           this.getConnectorStatus(connectorId)
2023         );
2024         await OCPPServiceUtils.sendAndSetConnectorStatus(this, connectorId, connectorBootStatus);
2025       }
2026     }
2027     if (this.stationInfo?.firmwareStatus === FirmwareStatus.Installing) {
2028       await this.ocppRequestService.requestHandler<
2029         FirmwareStatusNotificationRequest,
2030         FirmwareStatusNotificationResponse
2031       >(this, RequestCommand.FIRMWARE_STATUS_NOTIFICATION, {
2032         status: FirmwareStatus.Installed,
2033       });
2034       this.stationInfo.firmwareStatus = FirmwareStatus.Installed;
2035     }
2036
2037     // Start the ATG
2038     if (this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true) {
2039       this.startAutomaticTransactionGenerator();
2040     }
2041     this.wsConnectionRestarted === true && this.flushMessageBuffer();
2042   }
2043
2044   private async stopMessageSequence(
2045     reason: StopTransactionReason = StopTransactionReason.NONE
2046   ): Promise<void> {
2047     // Stop WebSocket ping
2048     this.stopWebSocketPing();
2049     // Stop heartbeat
2050     this.stopHeartbeat();
2051     // Stop ongoing transactions
2052     if (this.automaticTransactionGenerator?.started === true) {
2053       this.stopAutomaticTransactionGenerator();
2054     } else {
2055       await this.stopRunningTransactions(reason);
2056     }
2057     for (const connectorId of this.connectors.keys()) {
2058       if (connectorId > 0) {
2059         await this.ocppRequestService.requestHandler<
2060           StatusNotificationRequest,
2061           StatusNotificationResponse
2062         >(
2063           this,
2064           RequestCommand.STATUS_NOTIFICATION,
2065           OCPPServiceUtils.buildStatusNotificationRequest(
2066             this,
2067             connectorId,
2068             ConnectorStatusEnum.Unavailable
2069           )
2070         );
2071         delete this.getConnectorStatus(connectorId)?.status;
2072       }
2073     }
2074   }
2075
2076   private startWebSocketPing(): void {
2077     const webSocketPingInterval: number = ChargingStationConfigurationUtils.getConfigurationKey(
2078       this,
2079       StandardParametersKey.WebSocketPingInterval
2080     )
2081       ? Utils.convertToInt(
2082           ChargingStationConfigurationUtils.getConfigurationKey(
2083             this,
2084             StandardParametersKey.WebSocketPingInterval
2085           )?.value
2086         )
2087       : 0;
2088     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
2089       this.webSocketPingSetInterval = setInterval(() => {
2090         if (this.isWebSocketConnectionOpened() === true) {
2091           this.wsConnection?.ping();
2092         }
2093       }, webSocketPingInterval * 1000);
2094       logger.info(
2095         `${this.logPrefix()} WebSocket ping started every ${Utils.formatDurationSeconds(
2096           webSocketPingInterval
2097         )}`
2098       );
2099     } else if (this.webSocketPingSetInterval) {
2100       logger.info(
2101         `${this.logPrefix()} WebSocket ping already started every ${Utils.formatDurationSeconds(
2102           webSocketPingInterval
2103         )}`
2104       );
2105     } else {
2106       logger.error(
2107         `${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval}, not starting the WebSocket ping`
2108       );
2109     }
2110   }
2111
2112   private stopWebSocketPing(): void {
2113     if (this.webSocketPingSetInterval) {
2114       clearInterval(this.webSocketPingSetInterval);
2115       delete this.webSocketPingSetInterval;
2116     }
2117   }
2118
2119   private getConfiguredSupervisionUrl(): URL {
2120     const supervisionUrls = this.stationInfo?.supervisionUrls ?? Configuration.getSupervisionUrls();
2121     if (Utils.isNotEmptyArray(supervisionUrls)) {
2122       let configuredSupervisionUrlIndex: number;
2123       switch (Configuration.getSupervisionUrlDistribution()) {
2124         case SupervisionUrlDistribution.RANDOM:
2125           configuredSupervisionUrlIndex = Math.floor(Utils.secureRandom() * supervisionUrls.length);
2126           break;
2127         case SupervisionUrlDistribution.ROUND_ROBIN:
2128         case SupervisionUrlDistribution.CHARGING_STATION_AFFINITY:
2129         default:
2130           Object.values(SupervisionUrlDistribution).includes(
2131             Configuration.getSupervisionUrlDistribution()
2132           ) === false &&
2133             logger.error(
2134               `${this.logPrefix()} Unknown supervision url distribution '${Configuration.getSupervisionUrlDistribution()}' from values '${SupervisionUrlDistribution.toString()}', defaulting to ${
2135                 SupervisionUrlDistribution.CHARGING_STATION_AFFINITY
2136               }`
2137             );
2138           configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
2139           break;
2140       }
2141       return new URL(supervisionUrls[configuredSupervisionUrlIndex]);
2142     }
2143     return new URL(supervisionUrls as string);
2144   }
2145
2146   private stopHeartbeat(): void {
2147     if (this.heartbeatSetInterval) {
2148       clearInterval(this.heartbeatSetInterval);
2149       delete this.heartbeatSetInterval;
2150     }
2151   }
2152
2153   private terminateWSConnection(): void {
2154     if (this.isWebSocketConnectionOpened() === true) {
2155       this.wsConnection?.terminate();
2156       this.wsConnection = null;
2157     }
2158   }
2159
2160   private getReconnectExponentialDelay(): boolean {
2161     return this.stationInfo?.reconnectExponentialDelay ?? false;
2162   }
2163
2164   private async reconnect(): Promise<void> {
2165     // Stop WebSocket ping
2166     this.stopWebSocketPing();
2167     // Stop heartbeat
2168     this.stopHeartbeat();
2169     // Stop the ATG if needed
2170     if (this.automaticTransactionGenerator?.configuration?.stopOnConnectionFailure === true) {
2171       this.stopAutomaticTransactionGenerator();
2172     }
2173     if (
2174       this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() ||
2175       this.getAutoReconnectMaxRetries() === -1
2176     ) {
2177       this.autoReconnectRetryCount++;
2178       const reconnectDelay = this.getReconnectExponentialDelay()
2179         ? Utils.exponentialDelay(this.autoReconnectRetryCount)
2180         : this.getConnectionTimeout() * 1000;
2181       const reconnectDelayWithdraw = 1000;
2182       const reconnectTimeout =
2183         reconnectDelay && reconnectDelay - reconnectDelayWithdraw > 0
2184           ? reconnectDelay - reconnectDelayWithdraw
2185           : 0;
2186       logger.error(
2187         `${this.logPrefix()} WebSocket connection retry in ${Utils.roundTo(
2188           reconnectDelay,
2189           2
2190         )}ms, timeout ${reconnectTimeout}ms`
2191       );
2192       await Utils.sleep(reconnectDelay);
2193       logger.error(
2194         `${this.logPrefix()} WebSocket connection retry #${this.autoReconnectRetryCount.toString()}`
2195       );
2196       this.openWSConnection(
2197         {
2198           ...(this.stationInfo?.wsOptions ?? {}),
2199           handshakeTimeout: reconnectTimeout,
2200         },
2201         { closeOpened: true }
2202       );
2203       this.wsConnectionRestarted = true;
2204     } else if (this.getAutoReconnectMaxRetries() !== -1) {
2205       logger.error(
2206         `${this.logPrefix()} WebSocket connection retries failure: maximum retries reached (${
2207           this.autoReconnectRetryCount
2208         }) or retries disabled (${this.getAutoReconnectMaxRetries()})`
2209       );
2210     }
2211   }
2212
2213   private getAutomaticTransactionGeneratorConfigurationFromTemplate():
2214     | AutomaticTransactionGeneratorConfiguration
2215     | undefined {
2216     return this.getTemplateFromFile()?.AutomaticTransactionGenerator;
2217   }
2218 }