src/charging-station/ChargingStation.ts

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