src/charging-station/ChargingStation.ts

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