src/charging-station/ChargingStation.ts

   1 // Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
   2
   3 import { AvailabilityType, BootNotificationRequest, CachedRequest, IncomingRequest, IncomingRequestCommand, RequestCommand } from '../types/ocpp/Requests';
   4 import { BootNotificationResponse, RegistrationStatus } from '../types/ocpp/Responses';
   5 import ChargingStationConfiguration, { ConfigurationKey } from '../types/ChargingStationConfiguration';
   6 import ChargingStationTemplate, { CurrentType, PowerUnits, Voltage } from '../types/ChargingStationTemplate';
   7 import { ConnectorPhaseRotation, StandardParametersKey, SupportedFeatureProfiles, VendorDefaultParametersKey } from '../types/ocpp/Configuration';
   8 import { ConnectorStatus, SampledValueTemplate } from '../types/Connectors';
   9 import { MeterValueMeasurand, MeterValuePhase } from '../types/ocpp/MeterValues';
  10 import { WSError, WebSocketCloseEventStatusCode } from '../types/WebSocket';
  11 import WebSocket, { ClientOptions, Data, OPEN } from 'ws';
  12
  13 import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
  14 import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
  15 import { ChargingProfile } from '../types/ocpp/ChargingProfile';
  16 import ChargingStationInfo from '../types/ChargingStationInfo';
  17 import { ChargingStationWorkerMessageEvents } from '../types/ChargingStationWorker';
  18 import { ClientRequestArgs } from 'http';
  19 import Configuration from '../utils/Configuration';
  20 import Constants from '../utils/Constants';
  21 import { ErrorType } from '../types/ocpp/ErrorType';
  22 import FileUtils from '../utils/FileUtils';
  23 import { MessageType } from '../types/ocpp/MessageType';
  24 import OCPP16IncomingRequestService from './ocpp/1.6/OCPP16IncomingRequestService';
  25 import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
  26 import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
  27 import OCPPError from './ocpp/OCPPError';
  28 import OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
  29 import OCPPRequestService from './ocpp/OCPPRequestService';
  30 import { OCPPVersion } from '../types/ocpp/OCPPVersion';
  31 import PerformanceStatistics from '../performance/PerformanceStatistics';
  32 import { StopTransactionReason } from '../types/ocpp/Transaction';
  33 import { URL } from 'url';
  34 import Utils from '../utils/Utils';
  35 import crypto from 'crypto';
  36 import fs from 'fs';
  37 import logger from '../utils/Logger';
  38 import { parentPort } from 'worker_threads';
  39 import path from 'path';
  40
  41 export default class ChargingStation {
  42   public readonly stationTemplateFile: string;
  43   public authorizedTags: string[];
  44   public stationInfo!: ChargingStationInfo;
  45   public readonly connectors: Map<number, ConnectorStatus>;
  46   public configuration!: ChargingStationConfiguration;
  47   public wsConnection!: WebSocket;
  48   public readonly requests: Map<string, CachedRequest>;
  49   public performanceStatistics!: PerformanceStatistics;
  50   public heartbeatSetInterval!: NodeJS.Timeout;
  51   public ocppRequestService!: OCPPRequestService;
  52   private readonly index: number;
  53   private bootNotificationRequest!: BootNotificationRequest;
  54   private bootNotificationResponse!: BootNotificationResponse | null;
  55   private connectorsConfigurationHash!: string;
  56   private ocppIncomingRequestService!: OCPPIncomingRequestService;
  57   private readonly messageBuffer: Set<string>;
  58   private wsConfiguredConnectionUrl!: URL;
  59   private wsConnectionRestarted: boolean;
  60   private stopped: boolean;
  61   private autoReconnectRetryCount: number;
  62   private automaticTransactionGenerator!: AutomaticTransactionGenerator;
  63   private webSocketPingSetInterval!: NodeJS.Timeout;
  64
  65   constructor(index: number, stationTemplateFile: string) {
  66     this.index = index;
  67     this.stationTemplateFile = stationTemplateFile;
  68     this.connectors = new Map<number, ConnectorStatus>();
  69     this.initialize();
  70
  71     this.stopped = false;
  72     this.wsConnectionRestarted = false;
  73     this.autoReconnectRetryCount = 0;
  74
  75     this.requests = new Map<string, CachedRequest>();
  76     this.messageBuffer = new Set<string>();
  77
  78     this.authorizedTags = this.getAuthorizedTags();
  79   }
  80
  81   get wsConnectionUrl(): URL {
  82     return this.getSupervisionURLOCPPConfiguration() ? new URL(this.getConfigurationKey(this.stationInfo.supervisionURLOCPPKey ?? VendorDefaultParametersKey.ConnectionUrl).value + '/' + this.stationInfo.chargingStationId) : this.wsConfiguredConnectionUrl;
  83   }
  84
  85   public logPrefix(): string {
  86     return Utils.logPrefix(` ${this.stationInfo.chargingStationId} |`);
  87   }
  88
  89   public getBootNotificationRequest(): BootNotificationRequest {
  90     return this.bootNotificationRequest;
  91   }
  92
  93   public getRandomIdTag(): string {
  94     const index = Math.floor(Utils.secureRandom() * this.authorizedTags.length);
  95     return this.authorizedTags[index];
  96   }
  97
  98   public hasAuthorizedTags(): boolean {
  99     return !Utils.isEmptyArray(this.authorizedTags);
 100   }
 101
 102   public getEnableStatistics(): boolean | undefined {
 103     return !Utils.isUndefined(this.stationInfo.enableStatistics) ? this.stationInfo.enableStatistics : true;
 104   }
 105
 106   public getMayAuthorizeAtRemoteStart(): boolean | undefined {
 107     return this.stationInfo.mayAuthorizeAtRemoteStart ?? true;
 108   }
 109
 110   public getNumberOfPhases(): number | undefined {
 111     switch (this.getCurrentOutType()) {
 112       case CurrentType.AC:
 113         return !Utils.isUndefined(this.stationInfo.numberOfPhases) ? this.stationInfo.numberOfPhases : 3;
 114       case CurrentType.DC:
 115         return 0;
 116     }
 117   }
 118
 119   public isWebSocketConnectionOpened(): boolean {
 120     return this.wsConnection?.readyState === OPEN;
 121   }
 122
 123   public isRegistered(): boolean {
 124     return this.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
 125   }
 126
 127   public isChargingStationAvailable(): boolean {
 128     return this.getConnectorStatus(0).availability === AvailabilityType.OPERATIVE;
 129   }
 130
 131   public isConnectorAvailable(id: number): boolean {
 132     return this.getConnectorStatus(id).availability === AvailabilityType.OPERATIVE;
 133   }
 134
 135   public getNumberOfConnectors(): number {
 136     return this.connectors.get(0) ? this.connectors.size - 1 : this.connectors.size;
 137   }
 138
 139   public getConnectorStatus(id: number): ConnectorStatus {
 140     return this.connectors.get(id);
 141   }
 142
 143   public getCurrentOutType(): CurrentType | undefined {
 144     return this.stationInfo.currentOutType ?? CurrentType.AC;
 145   }
 146
 147   public getVoltageOut(): number | undefined {
 148     const errMsg = `${this.logPrefix()} Unknown ${this.getCurrentOutType()} currentOutType in template file ${this.stationTemplateFile}, cannot define default voltage out`;
 149     let defaultVoltageOut: number;
 150     switch (this.getCurrentOutType()) {
 151       case CurrentType.AC:
 152         defaultVoltageOut = Voltage.VOLTAGE_230;
 153         break;
 154       case CurrentType.DC:
 155         defaultVoltageOut = Voltage.VOLTAGE_400;
 156         break;
 157       default:
 158         logger.error(errMsg);
 159         throw new Error(errMsg);
 160     }
 161     return !Utils.isUndefined(this.stationInfo.voltageOut) ? this.stationInfo.voltageOut : defaultVoltageOut;
 162   }
 163
 164   public getTransactionIdTag(transactionId: number): string | undefined {
 165     for (const connectorId of this.connectors.keys()) {
 166       if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
 167         return this.getConnectorStatus(connectorId).transactionIdTag;
 168       }
 169     }
 170   }
 171
 172   public getOutOfOrderEndMeterValues(): boolean {
 173     return this.stationInfo.outOfOrderEndMeterValues ?? false;
 174   }
 175
 176   public getBeginEndMeterValues(): boolean {
 177     return this.stationInfo.beginEndMeterValues ?? false;
 178   }
 179
 180   public getMeteringPerTransaction(): boolean {
 181     return this.stationInfo.meteringPerTransaction ?? true;
 182   }
 183
 184   public getTransactionDataMeterValues(): boolean {
 185     return this.stationInfo.transactionDataMeterValues ?? false;
 186   }
 187
 188   public getMainVoltageMeterValues(): boolean {
 189     return this.stationInfo.mainVoltageMeterValues ?? true;
 190   }
 191
 192   public getPhaseLineToLineVoltageMeterValues(): boolean {
 193     return this.stationInfo.phaseLineToLineVoltageMeterValues ?? false;
 194   }
 195
 196   public getEnergyActiveImportRegisterByTransactionId(transactionId: number): number | undefined {
 197     if (this.getMeteringPerTransaction()) {
 198       for (const connectorId of this.connectors.keys()) {
 199         if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
 200           return this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue;
 201         }
 202       }
 203     }
 204     for (const connectorId of this.connectors.keys()) {
 205       if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
 206         return this.getConnectorStatus(connectorId).energyActiveImportRegisterValue;
 207       }
 208     }
 209   }
 210
 211   public getEnergyActiveImportRegisterByConnectorId(connectorId: number): number | undefined {
 212     if (this.getMeteringPerTransaction()) {
 213       return this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue;
 214     }
 215     return this.getConnectorStatus(connectorId).energyActiveImportRegisterValue;
 216   }
 217
 218   public getAuthorizeRemoteTxRequests(): boolean {
 219     const authorizeRemoteTxRequests = this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests);
 220     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 221   }
 222
 223   public getLocalAuthListEnabled(): boolean {
 224     const localAuthListEnabled = this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled);
 225     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 226   }
 227
 228   public restartWebSocketPing(): void {
 229     // Stop WebSocket ping
 230     this.stopWebSocketPing();
 231     // Start WebSocket ping
 232     this.startWebSocketPing();
 233   }
 234
 235   public getSampledValueTemplate(connectorId: number, measurand: MeterValueMeasurand = MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER,
 236       phase?: MeterValuePhase): SampledValueTemplate | undefined {
 237     if (!Constants.SUPPORTED_MEASURANDS.includes(measurand)) {
 238       logger.warn(`${this.logPrefix()} Trying to get unsupported MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 239       return;
 240     }
 241     if (measurand !== MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER && !this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 242       logger.debug(`${this.logPrefix()} Trying to get MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId} not found in '${StandardParametersKey.MeterValuesSampledData}' OCPP parameter`);
 243       return;
 244     }
 245     const sampledValueTemplates: SampledValueTemplate[] = this.getConnectorStatus(connectorId).MeterValues;
 246     for (let index = 0; !Utils.isEmptyArray(sampledValueTemplates) && index < sampledValueTemplates.length; index++) {
 247       if (!Constants.SUPPORTED_MEASURANDS.includes(sampledValueTemplates[index]?.measurand ?? MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER)) {
 248         logger.warn(`${this.logPrefix()} Unsupported MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 249       } else if (phase && sampledValueTemplates[index]?.phase === phase && sampledValueTemplates[index]?.measurand === measurand
 250         && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 251         return sampledValueTemplates[index];
 252       } else if (!phase && !sampledValueTemplates[index].phase && sampledValueTemplates[index]?.measurand === measurand
 253         && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 254         return sampledValueTemplates[index];
 255       } else if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
 256         && (!sampledValueTemplates[index].measurand || sampledValueTemplates[index].measurand === measurand)) {
 257         return sampledValueTemplates[index];
 258       }
 259     }
 260     if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
 261       const errorMsg = `${this.logPrefix()} Missing MeterValues for default measurand '${measurand}' in template on connectorId ${connectorId}`;
 262       logger.error(errorMsg);
 263       throw new Error(errorMsg);
 264     }
 265     logger.debug(`${this.logPrefix()} No MeterValues for measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 266   }
 267
 268   public getAutomaticTransactionGeneratorRequireAuthorize(): boolean {
 269     return this.stationInfo.AutomaticTransactionGenerator.requireAuthorize ?? true;
 270   }
 271
 272   public startHeartbeat(): void {
 273     if (this.getHeartbeatInterval() && this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
 274       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 275       this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
 276         await this.ocppRequestService.sendHeartbeat();
 277       }, this.getHeartbeatInterval());
 278       logger.info(this.logPrefix() + ' Heartbeat started every ' + Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()));
 279     } else if (this.heartbeatSetInterval) {
 280       logger.info(this.logPrefix() + ' Heartbeat already started every ' + Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()));
 281     } else {
 282       logger.error(`${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval() ? Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()) : this.getHeartbeatInterval()}, not starting the heartbeat`);
 283     }
 284   }
 285
 286   public restartHeartbeat(): void {
 287     // Stop heartbeat
 288     this.stopHeartbeat();
 289     // Start heartbeat
 290     this.startHeartbeat();
 291   }
 292
 293   public startMeterValues(connectorId: number, interval: number): void {
 294     if (connectorId === 0) {
 295       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`);
 296       return;
 297     }
 298     if (!this.getConnectorStatus(connectorId)) {
 299       logger.error(`${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`);
 300       return;
 301     }
 302     if (!this.getConnectorStatus(connectorId)?.transactionStarted) {
 303       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
 304       return;
 305     } else if (this.getConnectorStatus(connectorId)?.transactionStarted && !this.getConnectorStatus(connectorId)?.transactionId) {
 306       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
 307       return;
 308     }
 309     if (interval > 0) {
 310       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 311       this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(async (): Promise<void> => {
 312         await this.ocppRequestService.sendMeterValues(connectorId, this.getConnectorStatus(connectorId).transactionId, interval);
 313       }, interval);
 314     } else {
 315       logger.error(`${this.logPrefix()} Charging station ${StandardParametersKey.MeterValueSampleInterval} configuration set to ${interval ? Utils.formatDurationMilliSeconds(interval) : interval}, not sending MeterValues`);
 316     }
 317   }
 318
 319   public start(): void {
 320     if (this.getEnableStatistics()) {
 321       this.performanceStatistics.start();
 322     }
 323     this.openWSConnection();
 324     // Monitor authorization file
 325     this.startAuthorizationFileMonitoring();
 326     // Monitor station template file
 327     this.startStationTemplateFileMonitoring();
 328     // Handle WebSocket message
 329     this.wsConnection.on('message', this.onMessage.bind(this));
 330     // Handle WebSocket error
 331     this.wsConnection.on('error', this.onError.bind(this));
 332     // Handle WebSocket close
 333     this.wsConnection.on('close', this.onClose.bind(this));
 334     // Handle WebSocket open
 335     this.wsConnection.on('open', this.onOpen.bind(this));
 336     // Handle WebSocket ping
 337     this.wsConnection.on('ping', this.onPing.bind(this));
 338     // Handle WebSocket pong
 339     this.wsConnection.on('pong', this.onPong.bind(this));
 340     parentPort.postMessage({ id: ChargingStationWorkerMessageEvents.STARTED, data: { id: this.stationInfo.chargingStationId } });
 341   }
 342
 343   public async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 344     // Stop message sequence
 345     await this.stopMessageSequence(reason);
 346     for (const connectorId of this.connectors.keys()) {
 347       if (connectorId > 0) {
 348         await this.ocppRequestService.sendStatusNotification(connectorId, ChargePointStatus.UNAVAILABLE);
 349         this.getConnectorStatus(connectorId).status = ChargePointStatus.UNAVAILABLE;
 350       }
 351     }
 352     if (this.isWebSocketConnectionOpened()) {
 353       this.wsConnection.close();
 354     }
 355     if (this.getEnableStatistics()) {
 356       this.performanceStatistics.stop();
 357     }
 358     this.bootNotificationResponse = null;
 359     parentPort.postMessage({ id: ChargingStationWorkerMessageEvents.STOPPED, data: { id: this.stationInfo.chargingStationId } });
 360     this.stopped = true;
 361   }
 362
 363   public getConfigurationKey(key: string | StandardParametersKey, caseInsensitive = false): ConfigurationKey | undefined {
 364     return this.configuration.configurationKey.find((configElement) => {
 365       if (caseInsensitive) {
 366         return configElement.key.toLowerCase() === key.toLowerCase();
 367       }
 368       return configElement.key === key;
 369     });
 370   }
 371
 372   public addConfigurationKey(key: string | StandardParametersKey, value: string, options: { readonly?: boolean, visible?: boolean, reboot?: boolean } = { readonly: false, visible: true, reboot: false }): void {
 373     const keyFound = this.getConfigurationKey(key);
 374     const readonly = options.readonly;
 375     const visible = options.visible;
 376     const reboot = options.reboot;
 377     if (!keyFound) {
 378       this.configuration.configurationKey.push({
 379         key,
 380         readonly,
 381         value,
 382         visible,
 383         reboot,
 384       });
 385     } else {
 386       logger.error(`${this.logPrefix()} Trying to add an already existing configuration key: %j`, keyFound);
 387     }
 388   }
 389
 390   public setConfigurationKeyValue(key: string | StandardParametersKey, value: string): void {
 391     const keyFound = this.getConfigurationKey(key);
 392     if (keyFound) {
 393       const keyIndex = this.configuration.configurationKey.indexOf(keyFound);
 394       this.configuration.configurationKey[keyIndex].value = value;
 395     } else {
 396       logger.error(`${this.logPrefix()} Trying to set a value on a non existing configuration key: %j`, { key, value });
 397     }
 398   }
 399
 400   public setChargingProfile(connectorId: number, cp: ChargingProfile): void {
 401     let cpReplaced = false;
 402     if (!Utils.isEmptyArray(this.getConnectorStatus(connectorId).chargingProfiles)) {
 403       this.getConnectorStatus(connectorId).chargingProfiles?.forEach((chargingProfile: ChargingProfile, index: number) => {
 404         if (chargingProfile.chargingProfileId === cp.chargingProfileId
 405           || (chargingProfile.stackLevel === cp.stackLevel && chargingProfile.chargingProfilePurpose === cp.chargingProfilePurpose)) {
 406           this.getConnectorStatus(connectorId).chargingProfiles[index] = cp;
 407           cpReplaced = true;
 408         }
 409       });
 410     }
 411     !cpReplaced && this.getConnectorStatus(connectorId).chargingProfiles?.push(cp);
 412   }
 413
 414   public resetConnectorStatus(connectorId: number): void {
 415     this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
 416     this.getConnectorStatus(connectorId).idTagAuthorized = false;
 417     this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
 418     this.getConnectorStatus(connectorId).transactionStarted = false;
 419     delete this.getConnectorStatus(connectorId).localAuthorizeIdTag;
 420     delete this.getConnectorStatus(connectorId).authorizeIdTag;
 421     delete this.getConnectorStatus(connectorId).transactionId;
 422     delete this.getConnectorStatus(connectorId).transactionIdTag;
 423     this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
 424     delete this.getConnectorStatus(connectorId).transactionBeginMeterValue;
 425     this.stopMeterValues(connectorId);
 426   }
 427
 428   public bufferMessage(message: string): void {
 429     this.messageBuffer.add(message);
 430   }
 431
 432   private flushMessageBuffer() {
 433     if (this.messageBuffer.size > 0) {
 434       this.messageBuffer.forEach((message) => {
 435         // TODO: evaluate the need to track performance
 436         this.wsConnection.send(message);
 437         this.messageBuffer.delete(message);
 438       });
 439     }
 440   }
 441
 442   private getSupervisionURLOCPPConfiguration(): boolean {
 443     return this.stationInfo.supervisionURLOCPPConfiguration ?? false;
 444   }
 445
 446   private getChargingStationId(stationTemplate: ChargingStationTemplate): string {
 447     // In case of multiple instances: add instance index to charging station id
 448     const instanceIndex = process.env.CF_INSTANCE_INDEX ?? 0;
 449     const idSuffix = stationTemplate.nameSuffix ?? '';
 450     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + instanceIndex.toString() + ('000000000' + this.index.toString()).substr(('000000000' + this.index.toString()).length - 4) + idSuffix;
 451   }
 452
 453   private buildStationInfo(): ChargingStationInfo {
 454     let stationTemplateFromFile: ChargingStationTemplate;
 455     try {
 456       // Load template file
 457       const fileDescriptor = fs.openSync(this.stationTemplateFile, 'r');
 458       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
 459       fs.closeSync(fileDescriptor);
 460     } catch (error) {
 461       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error as NodeJS.ErrnoException);
 462     }
 463     const stationInfo: ChargingStationInfo = stationTemplateFromFile ?? {} as ChargingStationInfo;
 464     stationInfo.wsOptions = stationTemplateFromFile?.wsOptions ?? {};
 465     if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
 466       stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
 467       const powerArrayRandomIndex = Math.floor(Utils.secureRandom() * stationTemplateFromFile.power.length);
 468       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 469         ? stationTemplateFromFile.power[powerArrayRandomIndex] * 1000
 470         : stationTemplateFromFile.power[powerArrayRandomIndex];
 471     } else {
 472       stationTemplateFromFile.power = stationTemplateFromFile.power as number;
 473       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 474         ? stationTemplateFromFile.power * 1000
 475         : stationTemplateFromFile.power;
 476     }
 477     delete stationInfo.power;
 478     delete stationInfo.powerUnit;
 479     stationInfo.chargingStationId = this.getChargingStationId(stationTemplateFromFile);
 480     stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
 481     return stationInfo;
 482   }
 483
 484   private getOCPPVersion(): OCPPVersion {
 485     return this.stationInfo.ocppVersion ? this.stationInfo.ocppVersion : OCPPVersion.VERSION_16;
 486   }
 487
 488   private handleUnsupportedVersion(version: OCPPVersion) {
 489     const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${this.stationTemplateFile}`;
 490     logger.error(errMsg);
 491     throw new Error(errMsg);
 492   }
 493
 494   private initialize(): void {
 495     this.stationInfo = this.buildStationInfo();
 496     this.configuration = this.getTemplateChargingStationConfiguration();
 497     delete this.stationInfo.Configuration;
 498     this.bootNotificationRequest = {
 499       chargePointModel: this.stationInfo.chargePointModel,
 500       chargePointVendor: this.stationInfo.chargePointVendor,
 501       ...!Utils.isUndefined(this.stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this.stationInfo.chargeBoxSerialNumberPrefix },
 502       ...!Utils.isUndefined(this.stationInfo.firmwareVersion) && { firmwareVersion: this.stationInfo.firmwareVersion },
 503     };
 504     // Build connectors if needed
 505     const maxConnectors = this.getMaxNumberOfConnectors();
 506     if (maxConnectors <= 0) {
 507       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with ${maxConnectors} connectors`);
 508     }
 509     const templateMaxConnectors = this.getTemplateMaxNumberOfConnectors();
 510     if (templateMaxConnectors <= 0) {
 511       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector configuration`);
 512     }
 513     if (!this.stationInfo.Connectors[0]) {
 514       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector Id 0 configuration`);
 515     }
 516     // Sanity check
 517     if (maxConnectors > (this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this.stationInfo.randomConnectors) {
 518       logger.warn(`${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this.stationTemplateFile}, forcing random connector configurations affectation`);
 519       this.stationInfo.randomConnectors = true;
 520     }
 521     const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this.stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
 522     const connectorsConfigChanged = this.connectors?.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash;
 523     if (this.connectors?.size === 0 || connectorsConfigChanged) {
 524       connectorsConfigChanged && (this.connectors.clear());
 525       this.connectorsConfigurationHash = connectorsConfigHash;
 526       // Add connector Id 0
 527       let lastConnector = '0';
 528       for (lastConnector in this.stationInfo.Connectors) {
 529         const lastConnectorId = Utils.convertToInt(lastConnector);
 530         if (lastConnectorId === 0 && this.getUseConnectorId0() && this.stationInfo.Connectors[lastConnector]) {
 531           this.connectors.set(lastConnectorId, Utils.cloneObject<ConnectorStatus>(this.stationInfo.Connectors[lastConnector]));
 532           this.getConnectorStatus(lastConnectorId).availability = AvailabilityType.OPERATIVE;
 533           if (Utils.isUndefined(this.getConnectorStatus(lastConnectorId)?.chargingProfiles)) {
 534             this.getConnectorStatus(lastConnectorId).chargingProfiles = [];
 535           }
 536         }
 537       }
 538       // Generate all connectors
 539       if ((this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
 540         for (let index = 1; index <= maxConnectors; index++) {
 541           const randConnectorId = this.stationInfo.randomConnectors ? Utils.getRandomInteger(Utils.convertToInt(lastConnector), 1) : index;
 542           this.connectors.set(index, Utils.cloneObject<ConnectorStatus>(this.stationInfo.Connectors[randConnectorId]));
 543           this.getConnectorStatus(index).availability = AvailabilityType.OPERATIVE;
 544           if (Utils.isUndefined(this.getConnectorStatus(index)?.chargingProfiles)) {
 545             this.getConnectorStatus(index).chargingProfiles = [];
 546           }
 547         }
 548       }
 549     }
 550     // Avoid duplication of connectors related information
 551     delete this.stationInfo.Connectors;
 552     // Initialize transaction attributes on connectors
 553     for (const connectorId of this.connectors.keys()) {
 554       if (connectorId > 0 && !this.getConnectorStatus(connectorId)?.transactionStarted) {
 555         this.initializeConnectorStatus(connectorId);
 556       }
 557     }
 558     this.wsConfiguredConnectionUrl = new URL(this.getConfiguredSupervisionURL().href + '/' + this.stationInfo.chargingStationId);
 559     switch (this.getOCPPVersion()) {
 560       case OCPPVersion.VERSION_16:
 561         this.ocppIncomingRequestService = new OCPP16IncomingRequestService(this);
 562         this.ocppRequestService = new OCPP16RequestService(this, new OCPP16ResponseService(this));
 563         break;
 564       default:
 565         this.handleUnsupportedVersion(this.getOCPPVersion());
 566         break;
 567     }
 568     // OCPP parameters
 569     this.initOCPPParameters();
 570     if (this.stationInfo.autoRegister) {
 571       this.bootNotificationResponse = {
 572         currentTime: new Date().toISOString(),
 573         interval: this.getHeartbeatInterval() / 1000,
 574         status: RegistrationStatus.ACCEPTED
 575       };
 576     }
 577     this.stationInfo.powerDivider = this.getPowerDivider();
 578     if (this.getEnableStatistics()) {
 579       this.performanceStatistics = new PerformanceStatistics(this.stationInfo.chargingStationId, this.wsConnectionUrl);
 580     }
 581   }
 582
 583   private initOCPPParameters(): void {
 584     if (this.getSupervisionURLOCPPConfiguration() && !this.getConfigurationKey(this.stationInfo.supervisionURLOCPPKey ?? VendorDefaultParametersKey.ConnectionUrl)) {
 585       this.addConfigurationKey(VendorDefaultParametersKey.ConnectionUrl, this.getConfiguredSupervisionURL().href, { reboot: true });
 586     }
 587     if (!this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles)) {
 588       this.addConfigurationKey(StandardParametersKey.SupportedFeatureProfiles, `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.Local_Auth_List_Management},${SupportedFeatureProfiles.Smart_Charging}`);
 589     }
 590     this.addConfigurationKey(StandardParametersKey.NumberOfConnectors, this.getNumberOfConnectors().toString(), { readonly: true });
 591     if (!this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData)) {
 592       this.addConfigurationKey(StandardParametersKey.MeterValuesSampledData, MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
 593     }
 594     if (!this.getConfigurationKey(StandardParametersKey.ConnectorPhaseRotation)) {
 595       const connectorPhaseRotation = [];
 596       for (const connectorId of this.connectors.keys()) {
 597         // AC/DC
 598         if (connectorId === 0 && this.getNumberOfPhases() === 0) {
 599           connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
 600         } else if (connectorId > 0 && this.getNumberOfPhases() === 0) {
 601           connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
 602         // AC
 603         } else if (connectorId > 0 && this.getNumberOfPhases() === 1) {
 604           connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
 605         } else if (connectorId > 0 && this.getNumberOfPhases() === 3) {
 606           connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
 607         }
 608       }
 609       this.addConfigurationKey(StandardParametersKey.ConnectorPhaseRotation, connectorPhaseRotation.toString());
 610     }
 611     if (!this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests)) {
 612       this.addConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests, 'true');
 613     }
 614     if (!this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled)
 615       && this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles).value.includes(SupportedFeatureProfiles.Local_Auth_List_Management)) {
 616       this.addConfigurationKey(StandardParametersKey.LocalAuthListEnabled, 'false');
 617     }
 618     if (!this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
 619       this.addConfigurationKey(StandardParametersKey.ConnectionTimeOut, Constants.DEFAULT_CONNECTION_TIMEOUT.toString());
 620     }
 621   }
 622
 623   private async onOpen(): Promise<void> {
 624     logger.info(`${this.logPrefix()} Connected to OCPP server through ${this.wsConnectionUrl.toString()}`);
 625     if (!this.isRegistered()) {
 626       // Send BootNotification
 627       let registrationRetryCount = 0;
 628       do {
 629         this.bootNotificationResponse = await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel,
 630           this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
 631         if (!this.isRegistered()) {
 632           registrationRetryCount++;
 633           await Utils.sleep(this.bootNotificationResponse?.interval ? this.bootNotificationResponse.interval * 1000 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL);
 634         }
 635       } while (!this.isRegistered() && (registrationRetryCount <= this.getRegistrationMaxRetries() || this.getRegistrationMaxRetries() === -1));
 636     }
 637     if (this.isRegistered()) {
 638       await this.startMessageSequence();
 639       this.stopped && (this.stopped = false);
 640       if (this.wsConnectionRestarted && this.isWebSocketConnectionOpened()) {
 641         this.flushMessageBuffer();
 642       }
 643     } else {
 644       logger.error(`${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`);
 645     }
 646     this.autoReconnectRetryCount = 0;
 647     this.wsConnectionRestarted = false;
 648   }
 649
 650   private async onClose(code: number, reason: string): Promise<void> {
 651     switch (code) {
 652       // Normal close
 653       case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
 654       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
 655         logger.info(`${this.logPrefix()} WebSocket normally closed with status '${Utils.getWebSocketCloseEventStatusString(code)}' and reason '${reason}'`);
 656         this.autoReconnectRetryCount = 0;
 657         break;
 658       // Abnormal close
 659       default:
 660         logger.error(`${this.logPrefix()} WebSocket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(code)}' and reason '${reason}'`);
 661         await this.reconnect(code);
 662         break;
 663     }
 664   }
 665
 666   private async onMessage(data: Data): Promise<void> {
 667     let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, {}, {}];
 668     let responseCallback: (payload: Record<string, unknown> | string, requestPayload: Record<string, unknown>) => void;
 669     let rejectCallback: (error: OCPPError, requestStatistic?: boolean) => void;
 670     let requestCommandName: RequestCommand | IncomingRequestCommand;
 671     let requestPayload: Record<string, unknown>;
 672     let cachedRequest: CachedRequest;
 673     let errMsg: string;
 674     try {
 675       const request = JSON.parse(data.toString()) as IncomingRequest;
 676       if (Utils.isIterable(request)) {
 677         // Parse the message
 678         [messageType, messageId, commandName, commandPayload, errorDetails] = request;
 679       } else {
 680         throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming request is not iterable', commandName);
 681       }
 682       // Check the Type of message
 683       switch (messageType) {
 684         // Incoming Message
 685         case MessageType.CALL_MESSAGE:
 686           if (this.getEnableStatistics()) {
 687             this.performanceStatistics.addRequestStatistic(commandName, messageType);
 688           }
 689           // Process the call
 690           await this.ocppIncomingRequestService.handleRequest(messageId, commandName, commandPayload);
 691           break;
 692         // Outcome Message
 693         case MessageType.CALL_RESULT_MESSAGE:
 694           // Respond
 695           cachedRequest = this.requests.get(messageId);
 696           if (Utils.isIterable(cachedRequest)) {
 697             [responseCallback, , , requestPayload] = cachedRequest;
 698           } else {
 699             throw new OCPPError(ErrorType.PROTOCOL_ERROR, `Cached request for message id ${messageId} response is not iterable`, commandName);
 700           }
 701           if (!responseCallback) {
 702             // Error
 703             throw new OCPPError(ErrorType.INTERNAL_ERROR, `Response for unknown message id ${messageId}`, commandName);
 704           }
 705           responseCallback(commandName, requestPayload);
 706           break;
 707         // Error Message
 708         case MessageType.CALL_ERROR_MESSAGE:
 709           cachedRequest = this.requests.get(messageId);
 710           if (Utils.isIterable(cachedRequest)) {
 711             [, rejectCallback, requestCommandName] = cachedRequest;
 712           } else {
 713             throw new OCPPError(ErrorType.PROTOCOL_ERROR, `Cached request for message id ${messageId} error response is not iterable`);
 714           }
 715           if (!rejectCallback) {
 716             // Error
 717             throw new OCPPError(ErrorType.INTERNAL_ERROR, `Error response for unknown message id ${messageId}`, requestCommandName);
 718           }
 719           rejectCallback(new OCPPError(commandName, commandPayload.toString(), requestCommandName, errorDetails));
 720           break;
 721         // Error
 722         default:
 723           errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
 724           logger.error(errMsg);
 725           throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg);
 726       }
 727     } catch (error) {
 728       // Log
 729       logger.error('%s Incoming OCPP message %j matching cached request %j processing error %j', this.logPrefix(), data.toString(), this.requests.get(messageId), error);
 730       // Send error
 731       messageType === MessageType.CALL_MESSAGE && await this.ocppRequestService.sendError(messageId, error as OCPPError, commandName);
 732     }
 733   }
 734
 735   private onPing(): void {
 736     logger.debug(this.logPrefix() + ' Received a WS ping (rfc6455) from the server');
 737   }
 738
 739   private onPong(): void {
 740     logger.debug(this.logPrefix() + ' Received a WS pong (rfc6455) from the server');
 741   }
 742
 743   private async onError(error: WSError): Promise<void> {
 744     logger.error(this.logPrefix() + ' WebSocket error: %j', error);
 745     // switch (error.code) {
 746     //   case 'ECONNREFUSED':
 747     //     await this.reconnect(error);
 748     //     break;
 749     // }
 750   }
 751
 752   private getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
 753     return this.stationInfo.Configuration ?? {} as ChargingStationConfiguration;
 754   }
 755
 756   private getAuthorizationFile(): string | undefined {
 757     return this.stationInfo.authorizationFile && path.join(path.resolve(__dirname, '../'), 'assets', path.basename(this.stationInfo.authorizationFile));
 758   }
 759
 760   private getAuthorizedTags(): string[] {
 761     let authorizedTags: string[] = [];
 762     const authorizationFile = this.getAuthorizationFile();
 763     if (authorizationFile) {
 764       try {
 765         // Load authorization file
 766         const fileDescriptor = fs.openSync(authorizationFile, 'r');
 767         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
 768         fs.closeSync(fileDescriptor);
 769       } catch (error) {
 770         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error as NodeJS.ErrnoException);
 771       }
 772     } else {
 773       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile);
 774     }
 775     return authorizedTags;
 776   }
 777
 778   private getUseConnectorId0(): boolean | undefined {
 779     return !Utils.isUndefined(this.stationInfo.useConnectorId0) ? this.stationInfo.useConnectorId0 : true;
 780   }
 781
 782   private getNumberOfRunningTransactions(): number {
 783     let trxCount = 0;
 784     for (const connectorId of this.connectors.keys()) {
 785       if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
 786         trxCount++;
 787       }
 788     }
 789     return trxCount;
 790   }
 791
 792   // 0 for disabling
 793   private getConnectionTimeout(): number | undefined {
 794     if (this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
 795       return parseInt(this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut).value) ?? Constants.DEFAULT_CONNECTION_TIMEOUT;
 796     }
 797     return Constants.DEFAULT_CONNECTION_TIMEOUT;
 798   }
 799
 800   // -1 for unlimited, 0 for disabling
 801   private getAutoReconnectMaxRetries(): number | undefined {
 802     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
 803       return this.stationInfo.autoReconnectMaxRetries;
 804     }
 805     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
 806       return Configuration.getAutoReconnectMaxRetries();
 807     }
 808     return -1;
 809   }
 810
 811   // 0 for disabling
 812   private getRegistrationMaxRetries(): number | undefined {
 813     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
 814       return this.stationInfo.registrationMaxRetries;
 815     }
 816     return -1;
 817   }
 818
 819   private getPowerDivider(): number {
 820     let powerDivider = this.getNumberOfConnectors();
 821     if (this.stationInfo.powerSharedByConnectors) {
 822       powerDivider = this.getNumberOfRunningTransactions();
 823     }
 824     return powerDivider;
 825   }
 826
 827   private getTemplateMaxNumberOfConnectors(): number {
 828     return Object.keys(this.stationInfo.Connectors).length;
 829   }
 830
 831   private getMaxNumberOfConnectors(): number {
 832     let maxConnectors = 0;
 833     if (!Utils.isEmptyArray(this.stationInfo.numberOfConnectors)) {
 834       const numberOfConnectors = this.stationInfo.numberOfConnectors as number[];
 835       // Distribute evenly the number of connectors
 836       maxConnectors = numberOfConnectors[(this.index - 1) % numberOfConnectors.length];
 837     } else if (!Utils.isUndefined(this.stationInfo.numberOfConnectors)) {
 838       maxConnectors = this.stationInfo.numberOfConnectors as number;
 839     } else {
 840       maxConnectors = this.stationInfo.Connectors[0] ? this.getTemplateMaxNumberOfConnectors() - 1 : this.getTemplateMaxNumberOfConnectors();
 841     }
 842     return maxConnectors;
 843   }
 844
 845   private async startMessageSequence(): Promise<void> {
 846     // Start WebSocket ping
 847     this.startWebSocketPing();
 848     // Start heartbeat
 849     this.startHeartbeat();
 850     // Initialize connectors status
 851     for (const connectorId of this.connectors.keys()) {
 852       if (connectorId === 0) {
 853         continue;
 854       } else if (!this.stopped && !this.getConnectorStatus(connectorId)?.status && this.getConnectorStatus(connectorId)?.bootStatus) {
 855         // Send status in template at startup
 856         await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).bootStatus);
 857         this.getConnectorStatus(connectorId).status = this.getConnectorStatus(connectorId).bootStatus;
 858       } else if (this.stopped && this.getConnectorStatus(connectorId)?.status && this.getConnectorStatus(connectorId)?.bootStatus) {
 859         // Send status in template after reset
 860         await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).bootStatus);
 861         this.getConnectorStatus(connectorId).status = this.getConnectorStatus(connectorId).bootStatus;
 862       } else if (!this.stopped && this.getConnectorStatus(connectorId)?.status) {
 863         // Send previous status at template reload
 864         await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).status);
 865       } else {
 866         // Send default status
 867         await this.ocppRequestService.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
 868         this.getConnectorStatus(connectorId).status = ChargePointStatus.AVAILABLE;
 869       }
 870     }
 871     // Start the ATG
 872     this.startAutomaticTransactionGenerator();
 873   }
 874
 875   private startAutomaticTransactionGenerator() {
 876     if (this.stationInfo.AutomaticTransactionGenerator.enable) {
 877       if (!this.automaticTransactionGenerator) {
 878         this.automaticTransactionGenerator = new AutomaticTransactionGenerator(this);
 879       }
 880       if (!this.automaticTransactionGenerator.started) {
 881         this.automaticTransactionGenerator.start();
 882       }
 883     }
 884   }
 885
 886   private async stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 887     // Stop WebSocket ping
 888     this.stopWebSocketPing();
 889     // Stop heartbeat
 890     this.stopHeartbeat();
 891     // Stop the ATG
 892     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
 893       this.automaticTransactionGenerator &&
 894       this.automaticTransactionGenerator.started) {
 895       this.automaticTransactionGenerator.stop();
 896     } else {
 897       for (const connectorId of this.connectors.keys()) {
 898         if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
 899           const transactionId = this.getConnectorStatus(connectorId).transactionId;
 900           await this.ocppRequestService.sendStopTransaction(transactionId, this.getEnergyActiveImportRegisterByTransactionId(transactionId),
 901             this.getTransactionIdTag(transactionId), reason);
 902         }
 903       }
 904     }
 905   }
 906
 907   private startWebSocketPing(): void {
 908     const webSocketPingInterval: number = this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval)
 909       ? Utils.convertToInt(this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval).value)
 910       : 0;
 911     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
 912       this.webSocketPingSetInterval = setInterval(() => {
 913         if (this.isWebSocketConnectionOpened()) {
 914           this.wsConnection.ping((): void => { /* This is intentional */ });
 915         }
 916       }, webSocketPingInterval * 1000);
 917       logger.info(this.logPrefix() + ' WebSocket ping started every ' + Utils.formatDurationSeconds(webSocketPingInterval));
 918     } else if (this.webSocketPingSetInterval) {
 919       logger.info(this.logPrefix() + ' WebSocket ping every ' + Utils.formatDurationSeconds(webSocketPingInterval) + ' already started');
 920     } else {
 921       logger.error(`${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.formatDurationSeconds(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
 922     }
 923   }
 924
 925   private stopWebSocketPing(): void {
 926     if (this.webSocketPingSetInterval) {
 927       clearInterval(this.webSocketPingSetInterval);
 928     }
 929   }
 930
 931   private getConfiguredSupervisionURL(): URL {
 932     const supervisionUrls = Utils.cloneObject<string | string[]>(this.stationInfo.supervisionURL ?? Configuration.getSupervisionURLs());
 933     let indexUrl = 0;
 934     if (!Utils.isEmptyArray(supervisionUrls)) {
 935       if (Configuration.getDistributeStationsToTenantsEqually()) {
 936         indexUrl = this.index % supervisionUrls.length;
 937       } else {
 938         // Get a random url
 939         indexUrl = Math.floor(Utils.secureRandom() * supervisionUrls.length);
 940       }
 941       return new URL(supervisionUrls[indexUrl]);
 942     }
 943     return new URL(supervisionUrls as string);
 944   }
 945
 946   private getHeartbeatInterval(): number | undefined {
 947     const HeartbeatInterval = this.getConfigurationKey(StandardParametersKey.HeartbeatInterval);
 948     if (HeartbeatInterval) {
 949       return Utils.convertToInt(HeartbeatInterval.value) * 1000;
 950     }
 951     const HeartBeatInterval = this.getConfigurationKey(StandardParametersKey.HeartBeatInterval);
 952     if (HeartBeatInterval) {
 953       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
 954     }
 955     !this.stationInfo.autoRegister && logger.warn(`${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${Constants.DEFAULT_HEARTBEAT_INTERVAL}`);
 956     return Constants.DEFAULT_HEARTBEAT_INTERVAL;
 957   }
 958
 959   private stopHeartbeat(): void {
 960     if (this.heartbeatSetInterval) {
 961       clearInterval(this.heartbeatSetInterval);
 962     }
 963   }
 964
 965   private openWSConnection(options: ClientOptions & ClientRequestArgs = this.stationInfo.wsOptions, forceCloseOpened = false): void {
 966     options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
 967     if (!Utils.isNullOrUndefined(this.stationInfo.supervisionUser) && !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)) {
 968       options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
 969     }
 970     if (this.isWebSocketConnectionOpened() && forceCloseOpened) {
 971       this.wsConnection.close();
 972     }
 973     let protocol: string;
 974     switch (this.getOCPPVersion()) {
 975       case OCPPVersion.VERSION_16:
 976         protocol = 'ocpp' + OCPPVersion.VERSION_16;
 977         break;
 978       default:
 979         this.handleUnsupportedVersion(this.getOCPPVersion());
 980         break;
 981     }
 982     this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
 983     logger.info(this.logPrefix() + ' Open OCPP connection to URL ' + this.wsConnectionUrl.toString());
 984   }
 985
 986   private stopMeterValues(connectorId: number) {
 987     if (this.getConnectorStatus(connectorId)?.transactionSetInterval) {
 988       clearInterval(this.getConnectorStatus(connectorId).transactionSetInterval);
 989     }
 990   }
 991
 992   private startAuthorizationFileMonitoring(): void {
 993     const authorizationFile = this.getAuthorizationFile();
 994     if (authorizationFile) {
 995       try {
 996         fs.watch(authorizationFile, (event, filename) => {
 997           if (filename && event === 'change') {
 998             try {
 999               logger.debug(this.logPrefix() + ' Authorization file ' + authorizationFile + ' have changed, reload');
1000               // Initialize authorizedTags
1001               this.authorizedTags = this.getAuthorizedTags();
1002             } catch (error) {
1003               logger.error(this.logPrefix() + ' Authorization file monitoring error: %j', error);
1004             }
1005           }
1006         });
1007       } catch (error) {
1008         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error as NodeJS.ErrnoException);
1009       }
1010     } else {
1011       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile + '. Not monitoring changes');
1012     }
1013   }
1014
1015   private startStationTemplateFileMonitoring(): void {
1016     try {
1017       fs.watch(this.stationTemplateFile, (event, filename): void => {
1018         if (filename && event === 'change') {
1019           try {
1020             logger.debug(this.logPrefix() + ' Template file ' + this.stationTemplateFile + ' have changed, reload');
1021             // Initialize
1022             this.initialize();
1023             // Restart the ATG
1024             if (!this.stationInfo.AutomaticTransactionGenerator.enable &&
1025               this.automaticTransactionGenerator) {
1026               this.automaticTransactionGenerator.stop();
1027             }
1028             this.startAutomaticTransactionGenerator();
1029             if (this.getEnableStatistics()) {
1030               this.performanceStatistics.restart();
1031             } else {
1032               this.performanceStatistics.stop();
1033             }
1034             // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
1035           } catch (error) {
1036             logger.error(this.logPrefix() + ' Charging station template file monitoring error: %j', error);
1037           }
1038         }
1039       });
1040     } catch (error) {
1041       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error as NodeJS.ErrnoException);
1042     }
1043   }
1044
1045   private getReconnectExponentialDelay(): boolean | undefined {
1046     return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay) ? this.stationInfo.reconnectExponentialDelay : false;
1047   }
1048
1049   private async reconnect(code: number): Promise<void> {
1050     // Stop WebSocket ping
1051     this.stopWebSocketPing();
1052     // Stop heartbeat
1053     this.stopHeartbeat();
1054     // Stop the ATG if needed
1055     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
1056       this.stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
1057       this.automaticTransactionGenerator &&
1058       this.automaticTransactionGenerator.started) {
1059       this.automaticTransactionGenerator.stop();
1060     }
1061     if (this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() || this.getAutoReconnectMaxRetries() === -1) {
1062       this.autoReconnectRetryCount++;
1063       const reconnectDelay = (this.getReconnectExponentialDelay() ? Utils.exponentialDelay(this.autoReconnectRetryCount) : this.getConnectionTimeout() * 1000);
1064       const reconnectTimeout = (reconnectDelay - 100) > 0 && reconnectDelay;
1065       logger.error(`${this.logPrefix()} WebSocket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectTimeout}ms`);
1066       await Utils.sleep(reconnectDelay);
1067       logger.error(this.logPrefix() + ' WebSocket: reconnecting try #' + this.autoReconnectRetryCount.toString());
1068       this.openWSConnection({ ...this.stationInfo.wsOptions, handshakeTimeout: reconnectTimeout }, true);
1069       this.wsConnectionRestarted = true;
1070     } else if (this.getAutoReconnectMaxRetries() !== -1) {
1071       logger.error(`${this.logPrefix()} WebSocket reconnect failure: max retries reached (${this.autoReconnectRetryCount}) or retry disabled (${this.getAutoReconnectMaxRetries()})`);
1072     }
1073   }
1074
1075   private initializeConnectorStatus(connectorId: number): void {
1076     this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
1077     this.getConnectorStatus(connectorId).idTagAuthorized = false;
1078     this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
1079     this.getConnectorStatus(connectorId).transactionStarted = false;
1080     this.getConnectorStatus(connectorId).energyActiveImportRegisterValue = 0;
1081     this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
1082   }
1083 }
1084