src/charging-station/ChargingStation.ts

   1 import { BootNotificationResponse, RegistrationStatus } from '../types/ocpp/Responses';
   2 import ChargingStationConfiguration, { ConfigurationKey } from '../types/ChargingStationConfiguration';
   3 import ChargingStationTemplate, { CurrentType, PowerUnits, Voltage } from '../types/ChargingStationTemplate';
   4 import { ConnectorPhaseRotation, StandardParametersKey, SupportedFeatureProfiles } from '../types/ocpp/Configuration';
   5 import Connectors, { Connector, SampledValueTemplate } from '../types/Connectors';
   6 import { MeterValueMeasurand, MeterValuePhase } from '../types/ocpp/MeterValues';
   7 import { PerformanceObserver, performance } from 'perf_hooks';
   8 import Requests, { AvailabilityType, BootNotificationRequest, IncomingRequest, IncomingRequestCommand } from '../types/ocpp/Requests';
   9 import WebSocket, { MessageEvent } from 'ws';
  10
  11 import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
  12 import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
  13 import { ChargingProfile } from '../types/ocpp/ChargingProfile';
  14 import ChargingStationInfo from '../types/ChargingStationInfo';
  15 import Configuration from '../utils/Configuration';
  16 import Constants from '../utils/Constants';
  17 import FileUtils from '../utils/FileUtils';
  18 import { MessageType } from '../types/ocpp/MessageType';
  19 import OCPP16IncomingRequestService from './ocpp/1.6/OCCP16IncomingRequestService';
  20 import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
  21 import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
  22 import OCPPError from './OcppError';
  23 import OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
  24 import OCPPRequestService from './ocpp/OCPPRequestService';
  25 import { OCPPVersion } from '../types/ocpp/OCPPVersion';
  26 import PerformanceStatistics from '../utils/PerformanceStatistics';
  27 import { StopTransactionReason } from '../types/ocpp/Transaction';
  28 import Utils from '../utils/Utils';
  29 import { WebSocketCloseEventStatusCode } from '../types/WebSocket';
  30 import crypto from 'crypto';
  31 import fs from 'fs';
  32 import logger from '../utils/Logger';
  33 import path from 'path';
  34
  35 export default class ChargingStation {
  36   public stationTemplateFile: string;
  37   public authorizedTags: string[];
  38   public stationInfo!: ChargingStationInfo;
  39   public connectors: Connectors;
  40   public configuration!: ChargingStationConfiguration;
  41   public hasStopped: boolean;
  42   public wsConnection!: WebSocket;
  43   public requests: Requests;
  44   public messageQueue: string[];
  45   public performanceStatistics!: PerformanceStatistics;
  46   public heartbeatSetInterval!: NodeJS.Timeout;
  47   public ocppIncomingRequestService!: OCPPIncomingRequestService;
  48   public ocppRequestService!: OCPPRequestService;
  49   private index: number;
  50   private bootNotificationRequest!: BootNotificationRequest;
  51   private bootNotificationResponse!: BootNotificationResponse | null;
  52   private connectorsConfigurationHash!: string;
  53   private supervisionUrl!: string;
  54   private wsConnectionUrl!: string;
  55   private hasSocketRestarted: boolean;
  56   private autoReconnectRetryCount: number;
  57   private automaticTransactionGeneration!: AutomaticTransactionGenerator;
  58   private performanceObserver!: PerformanceObserver;
  59   private webSocketPingSetInterval!: NodeJS.Timeout;
  60
  61   constructor(index: number, stationTemplateFile: string) {
  62     this.index = index;
  63     this.stationTemplateFile = stationTemplateFile;
  64     this.connectors = {} as Connectors;
  65     this.initialize();
  66
  67     this.hasStopped = false;
  68     this.hasSocketRestarted = false;
  69     this.autoReconnectRetryCount = 0;
  70
  71     this.requests = {} as Requests;
  72     this.messageQueue = [] as string[];
  73
  74     this.authorizedTags = this.getAuthorizedTags();
  75   }
  76
  77   public logPrefix(): string {
  78     return Utils.logPrefix(` ${this.stationInfo.chargingStationId} |`);
  79   }
  80
  81   public getRandomTagId(): string {
  82     const index = Math.floor(Math.random() * this.authorizedTags.length);
  83     return this.authorizedTags[index];
  84   }
  85
  86   public hasAuthorizedTags(): boolean {
  87     return !Utils.isEmptyArray(this.authorizedTags);
  88   }
  89
  90   public getEnableStatistics(): boolean | undefined {
  91     return !Utils.isUndefined(this.stationInfo.enableStatistics) ? this.stationInfo.enableStatistics : true;
  92   }
  93
  94   public getMayAuthorizeAtRemoteStart(): boolean | undefined {
  95     return this.stationInfo.mayAuthorizeAtRemoteStart ?? true;
  96   }
  97
  98   public getNumberOfPhases(): number | undefined {
  99     switch (this.getCurrentOutType()) {
 100       case CurrentType.AC:
 101         return !Utils.isUndefined(this.stationInfo.numberOfPhases) ? this.stationInfo.numberOfPhases : 3;
 102       case CurrentType.DC:
 103         return 0;
 104     }
 105   }
 106
 107   public isWebSocketOpen(): boolean {
 108     return this.wsConnection?.readyState === WebSocket.OPEN;
 109   }
 110
 111   public isRegistered(): boolean {
 112     return this.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
 113   }
 114
 115   public isChargingStationAvailable(): boolean {
 116     return this.getConnector(0).availability === AvailabilityType.OPERATIVE;
 117   }
 118
 119   public isConnectorAvailable(id: number): boolean {
 120     return this.getConnector(id).availability === AvailabilityType.OPERATIVE;
 121   }
 122
 123   public getConnector(id: number): Connector {
 124     return this.connectors[id];
 125   }
 126
 127   public getCurrentOutType(): CurrentType | undefined {
 128     return this.stationInfo.currentOutType ?? CurrentType.AC;
 129   }
 130
 131   public getVoltageOut(): number | undefined {
 132     const errMsg = `${this.logPrefix()} Unknown ${this.getCurrentOutType()} currentOutType in template file ${this.stationTemplateFile}, cannot define default voltage out`;
 133     let defaultVoltageOut: number;
 134     switch (this.getCurrentOutType()) {
 135       case CurrentType.AC:
 136         defaultVoltageOut = Voltage.VOLTAGE_230;
 137         break;
 138       case CurrentType.DC:
 139         defaultVoltageOut = Voltage.VOLTAGE_400;
 140         break;
 141       default:
 142         logger.error(errMsg);
 143         throw Error(errMsg);
 144     }
 145     return !Utils.isUndefined(this.stationInfo.voltageOut) ? this.stationInfo.voltageOut : defaultVoltageOut;
 146   }
 147
 148   public getTransactionIdTag(transactionId: number): string | undefined {
 149     for (const connector in this.connectors) {
 150       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 151         return this.getConnector(Utils.convertToInt(connector)).transactionIdTag;
 152       }
 153     }
 154   }
 155
 156   public getOutOfOrderEndMeterValues(): boolean {
 157     return this.stationInfo.outOfOrderEndMeterValues ?? false;
 158   }
 159
 160   public getBeginEndMeterValues(): boolean {
 161     return this.stationInfo.beginEndMeterValues ?? false;
 162   }
 163
 164   public getMeteringPerTransaction(): boolean {
 165     return this.stationInfo.meteringPerTransaction ?? true;
 166   }
 167
 168   public getTransactionDataMeterValues(): boolean {
 169     return this.stationInfo.transactionDataMeterValues ?? false;
 170   }
 171
 172   public getMainVoltageMeterValues(): boolean {
 173     return this.stationInfo.mainVoltageMeterValues ?? true;
 174   }
 175
 176   public getPhaseLineToLineVoltageMeterValues(): boolean {
 177     return this.stationInfo.phaseLineToLineVoltageMeterValues ?? false;
 178   }
 179
 180   public getEnergyActiveImportRegisterByTransactionId(transactionId: number): number | undefined {
 181     if (this.getMeteringPerTransaction()) {
 182       for (const connector in this.connectors) {
 183         if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 184           return this.getConnector(Utils.convertToInt(connector)).transactionEnergyActiveImportRegisterValue;
 185         }
 186       }
 187     }
 188     for (const connector in this.connectors) {
 189       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 190         return this.getConnector(Utils.convertToInt(connector)).energyActiveImportRegisterValue;
 191       }
 192     }
 193   }
 194
 195   public getEnergyActiveImportRegisterByConnectorId(connectorId: number): number | undefined {
 196     if (this.getMeteringPerTransaction()) {
 197       return this.getConnector(connectorId).transactionEnergyActiveImportRegisterValue;
 198     }
 199     return this.getConnector(connectorId).energyActiveImportRegisterValue;
 200   }
 201
 202   public getAuthorizeRemoteTxRequests(): boolean {
 203     const authorizeRemoteTxRequests = this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests);
 204     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 205   }
 206
 207   public getLocalAuthListEnabled(): boolean {
 208     const localAuthListEnabled = this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled);
 209     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 210   }
 211
 212   public restartWebSocketPing(): void {
 213     // Stop WebSocket ping
 214     this.stopWebSocketPing();
 215     // Start WebSocket ping
 216     this.startWebSocketPing();
 217   }
 218
 219   public getSampledValueTemplate(connectorId: number, measurand: MeterValueMeasurand = MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER,
 220       phase?: MeterValuePhase): SampledValueTemplate | undefined {
 221     if (!Constants.SUPPORTED_MEASURANDS.includes(measurand)) {
 222       logger.warn(`${this.logPrefix()} Trying to get unsupported MeterValues measurand ${measurand} ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 223       return;
 224     }
 225     if (measurand !== MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER && !this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 226       logger.debug(`${this.logPrefix()} Trying to get MeterValues measurand ${measurand} ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId} not found in '${StandardParametersKey.MeterValuesSampledData}' OCPP parameter`);
 227       return;
 228     }
 229     const sampledValueTemplates: SampledValueTemplate[] = this.getConnector(connectorId).MeterValues;
 230     for (let index = 0; !Utils.isEmptyArray(sampledValueTemplates) && index < sampledValueTemplates.length; index++) {
 231       if (!Constants.SUPPORTED_MEASURANDS.includes(sampledValueTemplates[index]?.measurand)) {
 232         logger.warn(`${this.logPrefix()} Unsupported MeterValues measurand ${measurand} ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 233         continue;
 234       } else if (phase && sampledValueTemplates[index]?.phase === phase && sampledValueTemplates[index]?.measurand === measurand
 235           && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 236         return sampledValueTemplates[index];
 237       } else if (!phase && !sampledValueTemplates[index].phase && sampledValueTemplates[index]?.measurand === measurand
 238                  && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 239         return sampledValueTemplates[index];
 240       } else if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
 241                  && (!sampledValueTemplates[index].measurand || sampledValueTemplates[index].measurand === measurand)) {
 242         return sampledValueTemplates[index];
 243       }
 244     }
 245     if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
 246       logger.error(`${this.logPrefix()} Missing MeterValues for default measurand ${measurand} in template on connectorId ${connectorId}`);
 247     }
 248     logger.debug(`${this.logPrefix()} No MeterValues for measurand ${measurand} ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 249   }
 250
 251   public getAutomaticTransactionGeneratorRequireAuthorize(): boolean {
 252     return this.stationInfo.AutomaticTransactionGenerator.requireAuthorize ?? true;
 253   }
 254
 255   public startHeartbeat(): void {
 256     if (this.getHeartbeatInterval() && this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
 257       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 258       this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
 259         await this.ocppRequestService.sendHeartbeat();
 260       }, this.getHeartbeatInterval());
 261       logger.info(this.logPrefix() + ' Heartbeat started every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()));
 262     } else if (this.heartbeatSetInterval) {
 263       logger.info(this.logPrefix() + ' Heartbeat already started every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()));
 264     } else {
 265       logger.error(`${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval() ? Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()) : this.getHeartbeatInterval()}, not starting the heartbeat`);
 266     }
 267   }
 268
 269   public restartHeartbeat(): void {
 270     // Stop heartbeat
 271     this.stopHeartbeat();
 272     // Start heartbeat
 273     this.startHeartbeat();
 274   }
 275
 276   public startMeterValues(connectorId: number, interval: number): void {
 277     if (connectorId === 0) {
 278       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`);
 279       return;
 280     }
 281     if (!this.getConnector(connectorId)) {
 282       logger.error(`${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`);
 283       return;
 284     }
 285     if (!this.getConnector(connectorId)?.transactionStarted) {
 286       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
 287       return;
 288     } else if (this.getConnector(connectorId)?.transactionStarted && !this.getConnector(connectorId)?.transactionId) {
 289       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
 290       return;
 291     }
 292     if (interval > 0) {
 293       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 294       this.getConnector(connectorId).transactionSetInterval = setInterval(async (): Promise<void> => {
 295         if (this.getEnableStatistics()) {
 296           const sendMeterValues = performance.timerify(this.ocppRequestService.sendMeterValues);
 297           this.performanceObserver.observe({
 298             entryTypes: ['function'],
 299           });
 300           await sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 301         } else {
 302           await this.ocppRequestService.sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 303         }
 304       }, interval);
 305     } else {
 306       logger.error(`${this.logPrefix()} Charging station ${StandardParametersKey.MeterValueSampleInterval} configuration set to ${interval ? Utils.milliSecondsToHHMMSS(interval) : interval}, not sending MeterValues`);
 307     }
 308   }
 309
 310   public start(): void {
 311     this.openWSConnection();
 312     // Monitor authorization file
 313     this.startAuthorizationFileMonitoring();
 314     // Monitor station template file
 315     this.startStationTemplateFileMonitoring();
 316     // Handle Socket incoming messages
 317     this.wsConnection.on('message', this.onMessage.bind(this));
 318     // Handle Socket error
 319     this.wsConnection.on('error', this.onError.bind(this));
 320     // Handle Socket close
 321     this.wsConnection.on('close', this.onClose.bind(this));
 322     // Handle Socket opening connection
 323     this.wsConnection.on('open', this.onOpen.bind(this));
 324     // Handle Socket ping
 325     this.wsConnection.on('ping', this.onPing.bind(this));
 326     // Handle Socket pong
 327     this.wsConnection.on('pong', this.onPong.bind(this));
 328   }
 329
 330   public async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 331     // Stop message sequence
 332     await this.stopMessageSequence(reason);
 333     for (const connector in this.connectors) {
 334       if (Utils.convertToInt(connector) > 0) {
 335         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.UNAVAILABLE);
 336         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.UNAVAILABLE;
 337       }
 338     }
 339     if (this.isWebSocketOpen()) {
 340       this.wsConnection.close();
 341     }
 342     this.bootNotificationResponse = null;
 343     this.hasStopped = true;
 344   }
 345
 346   public getConfigurationKey(key: string | StandardParametersKey, caseInsensitive = false): ConfigurationKey | undefined {
 347     const configurationKey: ConfigurationKey | undefined = this.configuration.configurationKey.find((configElement) => {
 348       if (caseInsensitive) {
 349         return configElement.key.toLowerCase() === key.toLowerCase();
 350       }
 351       return configElement.key === key;
 352     });
 353     return configurationKey;
 354   }
 355
 356   public addConfigurationKey(key: string | StandardParametersKey, value: string, readonly = false, visible = true, reboot = false): void {
 357     const keyFound = this.getConfigurationKey(key);
 358     if (!keyFound) {
 359       this.configuration.configurationKey.push({
 360         key,
 361         readonly,
 362         value,
 363         visible,
 364         reboot,
 365       });
 366     } else {
 367       logger.error(`${this.logPrefix()} Trying to add an already existing configuration key: %j`, keyFound);
 368     }
 369   }
 370
 371   public setConfigurationKeyValue(key: string | StandardParametersKey, value: string): void {
 372     const keyFound = this.getConfigurationKey(key);
 373     if (keyFound) {
 374       const keyIndex = this.configuration.configurationKey.indexOf(keyFound);
 375       this.configuration.configurationKey[keyIndex].value = value;
 376     } else {
 377       logger.error(`${this.logPrefix()} Trying to set a value on a non existing configuration key: %j`, { key, value });
 378     }
 379   }
 380
 381   public setChargingProfile(connectorId: number, cp: ChargingProfile): void {
 382     let cpReplaced = false;
 383     if (!Utils.isEmptyArray(this.getConnector(connectorId).chargingProfiles)) {
 384       this.getConnector(connectorId).chargingProfiles?.forEach((chargingProfile: ChargingProfile, index: number) => {
 385         if (chargingProfile.chargingProfileId === cp.chargingProfileId
 386             || (chargingProfile.stackLevel === cp.stackLevel && chargingProfile.chargingProfilePurpose === cp.chargingProfilePurpose)) {
 387           this.getConnector(connectorId).chargingProfiles[index] = cp;
 388           cpReplaced = true;
 389         }
 390       });
 391     }
 392     !cpReplaced && this.getConnector(connectorId).chargingProfiles?.push(cp);
 393   }
 394
 395   public resetTransactionOnConnector(connectorId: number): void {
 396     this.getConnector(connectorId).authorized = false;
 397     this.getConnector(connectorId).transactionStarted = false;
 398     delete this.getConnector(connectorId).authorizeIdTag;
 399     delete this.getConnector(connectorId).transactionId;
 400     delete this.getConnector(connectorId).transactionIdTag;
 401     this.getConnector(connectorId).transactionEnergyActiveImportRegisterValue = 0;
 402     delete this.getConnector(connectorId).transactionBeginMeterValue;
 403     this.stopMeterValues(connectorId);
 404   }
 405
 406   public addToMessageQueue(message: string): void {
 407     let dups = false;
 408     // Handle dups in message queue
 409     for (const bufferedMessage of this.messageQueue) {
 410       // Message already in the queue
 411       if (message === bufferedMessage) {
 412         dups = true;
 413         break;
 414       }
 415     }
 416     if (!dups) {
 417       // Queue message
 418       this.messageQueue.push(message);
 419     }
 420   }
 421
 422   private flushMessageQueue() {
 423     if (!Utils.isEmptyArray(this.messageQueue)) {
 424       this.messageQueue.forEach((message, index) => {
 425         this.messageQueue.splice(index, 1);
 426         this.wsConnection.send(message);
 427       });
 428     }
 429   }
 430
 431   private getChargingStationId(stationTemplate: ChargingStationTemplate): string {
 432     // In case of multiple instances: add instance index to charging station id
 433     let instanceIndex = process.env.CF_INSTANCE_INDEX ?? 0;
 434     instanceIndex = instanceIndex > 0 ? instanceIndex : '';
 435     const idSuffix = stationTemplate.nameSuffix ?? '';
 436     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + instanceIndex.toString() + ('000000000' + this.index.toString()).substr(('000000000' + this.index.toString()).length - 4) + idSuffix;
 437   }
 438
 439   private buildStationInfo(): ChargingStationInfo {
 440     let stationTemplateFromFile: ChargingStationTemplate;
 441     try {
 442       // Load template file
 443       const fileDescriptor = fs.openSync(this.stationTemplateFile, 'r');
 444       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
 445       fs.closeSync(fileDescriptor);
 446     } catch (error) {
 447       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error);
 448     }
 449     const stationInfo: ChargingStationInfo = stationTemplateFromFile ?? {} as ChargingStationInfo;
 450     if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
 451       stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
 452       const powerArrayRandomIndex = Math.floor(Math.random() * stationTemplateFromFile.power.length);
 453       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 454         ? stationTemplateFromFile.power[powerArrayRandomIndex] * 1000
 455         : stationTemplateFromFile.power[powerArrayRandomIndex];
 456     } else {
 457       stationTemplateFromFile.power = stationTemplateFromFile.power as number;
 458       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 459         ? stationTemplateFromFile.power * 1000
 460         : stationTemplateFromFile.power;
 461     }
 462     delete stationInfo.power;
 463     delete stationInfo.powerUnit;
 464     stationInfo.chargingStationId = this.getChargingStationId(stationTemplateFromFile);
 465     stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
 466     return stationInfo;
 467   }
 468
 469   private getOCPPVersion(): OCPPVersion {
 470     return this.stationInfo.ocppVersion ? this.stationInfo.ocppVersion : OCPPVersion.VERSION_16;
 471   }
 472
 473   private handleUnsupportedVersion(version: OCPPVersion) {
 474     const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${this.stationTemplateFile}`;
 475     logger.error(errMsg);
 476     throw new Error(errMsg);
 477   }
 478
 479   private initialize(): void {
 480     this.stationInfo = this.buildStationInfo();
 481     this.bootNotificationRequest = {
 482       chargePointModel: this.stationInfo.chargePointModel,
 483       chargePointVendor: this.stationInfo.chargePointVendor,
 484       ...!Utils.isUndefined(this.stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this.stationInfo.chargeBoxSerialNumberPrefix },
 485       ...!Utils.isUndefined(this.stationInfo.firmwareVersion) && { firmwareVersion: this.stationInfo.firmwareVersion },
 486     };
 487     this.configuration = this.getTemplateChargingStationConfiguration();
 488     this.supervisionUrl = this.getSupervisionURL();
 489     this.wsConnectionUrl = this.supervisionUrl + '/' + this.stationInfo.chargingStationId;
 490     // Build connectors if needed
 491     const maxConnectors = this.getMaxNumberOfConnectors();
 492     if (maxConnectors <= 0) {
 493       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with ${maxConnectors} connectors`);
 494     }
 495     const templateMaxConnectors = this.getTemplateMaxNumberOfConnectors();
 496     if (templateMaxConnectors <= 0) {
 497       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector configuration`);
 498     }
 499     if (!this.stationInfo.Connectors[0]) {
 500       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector Id 0 configuration`);
 501     }
 502     // Sanity check
 503     if (maxConnectors > (this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this.stationInfo.randomConnectors) {
 504       logger.warn(`${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this.stationTemplateFile}, forcing random connector configurations affectation`);
 505       this.stationInfo.randomConnectors = true;
 506     }
 507     const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this.stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
 508     // FIXME: Handle shrinking the number of connectors
 509     if (!this.connectors || (this.connectors && this.connectorsConfigurationHash !== connectorsConfigHash)) {
 510       this.connectorsConfigurationHash = connectorsConfigHash;
 511       // Add connector Id 0
 512       let lastConnector = '0';
 513       for (lastConnector in this.stationInfo.Connectors) {
 514         if (Utils.convertToInt(lastConnector) === 0 && this.getUseConnectorId0() && this.stationInfo.Connectors[lastConnector]) {
 515           this.connectors[lastConnector] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[lastConnector]);
 516           this.connectors[lastConnector].availability = AvailabilityType.OPERATIVE;
 517           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 518             this.connectors[lastConnector].chargingProfiles = [];
 519           }
 520         }
 521       }
 522       // Generate all connectors
 523       if ((this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
 524         for (let index = 1; index <= maxConnectors; index++) {
 525           const randConnectorId = this.stationInfo.randomConnectors ? Utils.getRandomInt(Utils.convertToInt(lastConnector), 1) : index;
 526           this.connectors[index] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[randConnectorId]);
 527           this.connectors[index].availability = AvailabilityType.OPERATIVE;
 528           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 529             this.connectors[index].chargingProfiles = [];
 530           }
 531         }
 532       }
 533     }
 534     // Avoid duplication of connectors related information
 535     delete this.stationInfo.Connectors;
 536     // Initialize transaction attributes on connectors
 537     for (const connector in this.connectors) {
 538       if (Utils.convertToInt(connector) > 0 && !this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 539         this.initTransactionAttributesOnConnector(Utils.convertToInt(connector));
 540       }
 541     }
 542     switch (this.getOCPPVersion()) {
 543       case OCPPVersion.VERSION_16:
 544         this.ocppIncomingRequestService = new OCPP16IncomingRequestService(this);
 545         this.ocppRequestService = new OCPP16RequestService(this, new OCPP16ResponseService(this));
 546         break;
 547       default:
 548         this.handleUnsupportedVersion(this.getOCPPVersion());
 549         break;
 550     }
 551     // OCPP parameters
 552     this.initOCPPParameters();
 553     if (this.stationInfo.autoRegister) {
 554       this.bootNotificationResponse = {
 555         currentTime: new Date().toISOString(),
 556         interval: this.getHeartbeatInterval() / 1000,
 557         status: RegistrationStatus.ACCEPTED
 558       };
 559     }
 560     this.stationInfo.powerDivider = this.getPowerDivider();
 561     if (this.getEnableStatistics()) {
 562       this.performanceStatistics = new PerformanceStatistics(this.stationInfo.chargingStationId);
 563       this.performanceObserver = new PerformanceObserver((list) => {
 564         const entry = list.getEntries()[0];
 565         this.performanceStatistics.logPerformance(entry, Constants.ENTITY_CHARGING_STATION);
 566         this.performanceObserver.disconnect();
 567       });
 568     }
 569   }
 570
 571   private initOCPPParameters(): void {
 572     if (!this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles)) {
 573       this.addConfigurationKey(StandardParametersKey.SupportedFeatureProfiles, `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.Local_Auth_List_Management},${SupportedFeatureProfiles.Smart_Charging}`);
 574     }
 575     this.addConfigurationKey(StandardParametersKey.NumberOfConnectors, this.getNumberOfConnectors().toString(), true);
 576     if (!this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData)) {
 577       this.addConfigurationKey(StandardParametersKey.MeterValuesSampledData, MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
 578     }
 579     if (!this.getConfigurationKey(StandardParametersKey.ConnectorPhaseRotation)) {
 580       const connectorPhaseRotation = [];
 581       for (const connector in this.connectors) {
 582         // AC/DC
 583         if (Utils.convertToInt(connector) === 0 && this.getNumberOfPhases() === 0) {
 584           connectorPhaseRotation.push(`${connector}.${ConnectorPhaseRotation.RST}`);
 585         } else if (Utils.convertToInt(connector) > 0 && this.getNumberOfPhases() === 0) {
 586           connectorPhaseRotation.push(`${connector}.${ConnectorPhaseRotation.NotApplicable}`);
 587         // AC
 588         } else if (Utils.convertToInt(connector) > 0 && this.getNumberOfPhases() === 1) {
 589           connectorPhaseRotation.push(`${connector}.${ConnectorPhaseRotation.NotApplicable}`);
 590         } else if (Utils.convertToInt(connector) > 0 && this.getNumberOfPhases() === 3) {
 591           connectorPhaseRotation.push(`${connector}.${ConnectorPhaseRotation.RST}`);
 592         }
 593       }
 594       this.addConfigurationKey(StandardParametersKey.ConnectorPhaseRotation, connectorPhaseRotation.toString());
 595     }
 596     if (!this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests)) {
 597       this.addConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests, 'true');
 598     }
 599     if (!this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled)
 600         && this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles).value.includes(SupportedFeatureProfiles.Local_Auth_List_Management)) {
 601       this.addConfigurationKey(StandardParametersKey.LocalAuthListEnabled, 'false');
 602     }
 603     if (!this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
 604       this.addConfigurationKey(StandardParametersKey.ConnectionTimeOut, Constants.DEFAULT_CONNECTION_TIMEOUT.toString());
 605     }
 606   }
 607
 608   private async onOpen(): Promise<void> {
 609     logger.info(`${this.logPrefix()} Is connected to server through ${this.wsConnectionUrl}`);
 610     if (!this.isRegistered()) {
 611       // Send BootNotification
 612       let registrationRetryCount = 0;
 613       do {
 614         this.bootNotificationResponse = await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel,
 615           this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
 616         if (!this.isRegistered()) {
 617           registrationRetryCount++;
 618           await Utils.sleep(this.bootNotificationResponse?.interval ? this.bootNotificationResponse.interval * 1000 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL);
 619         }
 620       } while (!this.isRegistered() && (registrationRetryCount <= this.getRegistrationMaxRetries() || this.getRegistrationMaxRetries() === -1));
 621     }
 622     if (this.isRegistered()) {
 623       await this.startMessageSequence();
 624       this.hasStopped && (this.hasStopped = false);
 625       if (this.hasSocketRestarted && this.isWebSocketOpen()) {
 626         this.flushMessageQueue();
 627       }
 628     } else {
 629       logger.error(`${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`);
 630     }
 631     this.autoReconnectRetryCount = 0;
 632     this.hasSocketRestarted = false;
 633   }
 634
 635   private async onClose(closeEvent: any): Promise<void> {
 636     switch (closeEvent) {
 637       case WebSocketCloseEventStatusCode.CLOSE_NORMAL: // Normal close
 638       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
 639         logger.info(`${this.logPrefix()} Socket normally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
 640         this.autoReconnectRetryCount = 0;
 641         break;
 642       default: // Abnormal close
 643         logger.error(`${this.logPrefix()} Socket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
 644         await this.reconnect(closeEvent);
 645         break;
 646     }
 647   }
 648
 649   private async onMessage(messageEvent: MessageEvent): Promise<void> {
 650     let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, {}, {}];
 651     let responseCallback: (payload: Record<string, unknown> | string, requestPayload: Record<string, unknown>) => void;
 652     let rejectCallback: (error: OCPPError) => void;
 653     let requestPayload: Record<string, unknown>;
 654     let errMsg: string;
 655     try {
 656       const request = JSON.parse(messageEvent.toString()) as IncomingRequest;
 657       if (Utils.isIterable(request)) {
 658         // Parse the message
 659         [messageType, messageId, commandName, commandPayload, errorDetails] = request;
 660       } else {
 661         throw new Error('Incoming request is not iterable');
 662       }
 663       // Check the Type of message
 664       switch (messageType) {
 665         // Incoming Message
 666         case MessageType.CALL_MESSAGE:
 667           if (this.getEnableStatistics()) {
 668             this.performanceStatistics.addMessage(commandName, messageType);
 669           }
 670           // Process the call
 671           await this.ocppIncomingRequestService.handleRequest(messageId, commandName, commandPayload);
 672           break;
 673         // Outcome Message
 674         case MessageType.CALL_RESULT_MESSAGE:
 675           // Respond
 676           if (Utils.isIterable(this.requests[messageId])) {
 677             [responseCallback, , requestPayload] = this.requests[messageId];
 678           } else {
 679             throw new Error(`Response request for message id ${messageId} is not iterable`);
 680           }
 681           if (!responseCallback) {
 682             // Error
 683             throw new Error(`Response request for unknown message id ${messageId}`);
 684           }
 685           delete this.requests[messageId];
 686           responseCallback(commandName, requestPayload);
 687           break;
 688         // Error Message
 689         case MessageType.CALL_ERROR_MESSAGE:
 690           if (!this.requests[messageId]) {
 691             // Error
 692             throw new Error(`Error request for unknown message id ${messageId}`);
 693           }
 694           if (Utils.isIterable(this.requests[messageId])) {
 695             [, rejectCallback] = this.requests[messageId];
 696           } else {
 697             throw new Error(`Error request for message id ${messageId} is not iterable`);
 698           }
 699           delete this.requests[messageId];
 700           rejectCallback(new OCPPError(commandName, commandPayload.toString(), errorDetails));
 701           break;
 702         // Error
 703         default:
 704           errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
 705           logger.error(errMsg);
 706           throw new Error(errMsg);
 707       }
 708     } catch (error) {
 709       // Log
 710       logger.error('%s Incoming request message %j processing error %j on content type %j', this.logPrefix(), messageEvent, error, this.requests[messageId]);
 711       // Send error
 712       messageType !== MessageType.CALL_ERROR_MESSAGE && await this.ocppRequestService.sendError(messageId, error, commandName);
 713     }
 714   }
 715
 716   private onPing(): void {
 717     logger.debug(this.logPrefix() + ' Has received a WS ping (rfc6455) from the server');
 718   }
 719
 720   private onPong(): void {
 721     logger.debug(this.logPrefix() + ' Has received a WS pong (rfc6455) from the server');
 722   }
 723
 724   private async onError(errorEvent: any): Promise<void> {
 725     logger.error(this.logPrefix() + ' Socket error: %j', errorEvent);
 726     // switch (errorEvent.code) {
 727     //   case 'ECONNREFUSED':
 728     //     await this._reconnect(errorEvent);
 729     //     break;
 730     // }
 731   }
 732
 733   private getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
 734     return this.stationInfo.Configuration ? this.stationInfo.Configuration : {} as ChargingStationConfiguration;
 735   }
 736
 737   private getAuthorizationFile(): string | undefined {
 738     return this.stationInfo.authorizationFile && path.join(path.resolve(__dirname, '../'), 'assets', path.basename(this.stationInfo.authorizationFile));
 739   }
 740
 741   private getAuthorizedTags(): string[] {
 742     let authorizedTags: string[] = [];
 743     const authorizationFile = this.getAuthorizationFile();
 744     if (authorizationFile) {
 745       try {
 746         // Load authorization file
 747         const fileDescriptor = fs.openSync(authorizationFile, 'r');
 748         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
 749         fs.closeSync(fileDescriptor);
 750       } catch (error) {
 751         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error);
 752       }
 753     } else {
 754       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile);
 755     }
 756     return authorizedTags;
 757   }
 758
 759   private getUseConnectorId0(): boolean | undefined {
 760     return !Utils.isUndefined(this.stationInfo.useConnectorId0) ? this.stationInfo.useConnectorId0 : true;
 761   }
 762
 763   private getNumberOfRunningTransactions(): number {
 764     let trxCount = 0;
 765     for (const connector in this.connectors) {
 766       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 767         trxCount++;
 768       }
 769     }
 770     return trxCount;
 771   }
 772
 773   // 0 for disabling
 774   private getConnectionTimeout(): number | undefined {
 775     if (this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
 776       return parseInt(this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut).value) ?? Constants.DEFAULT_CONNECTION_TIMEOUT;
 777     }
 778     return Constants.DEFAULT_CONNECTION_TIMEOUT;
 779   }
 780
 781   // -1 for unlimited, 0 for disabling
 782   private getAutoReconnectMaxRetries(): number | undefined {
 783     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
 784       return this.stationInfo.autoReconnectMaxRetries;
 785     }
 786     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
 787       return Configuration.getAutoReconnectMaxRetries();
 788     }
 789     return -1;
 790   }
 791
 792   // 0 for disabling
 793   private getRegistrationMaxRetries(): number | undefined {
 794     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
 795       return this.stationInfo.registrationMaxRetries;
 796     }
 797     return -1;
 798   }
 799
 800   private getPowerDivider(): number {
 801     let powerDivider = this.getNumberOfConnectors();
 802     if (this.stationInfo.powerSharedByConnectors) {
 803       powerDivider = this.getNumberOfRunningTransactions();
 804     }
 805     return powerDivider;
 806   }
 807
 808   private getTemplateMaxNumberOfConnectors(): number {
 809     return Object.keys(this.stationInfo.Connectors).length;
 810   }
 811
 812   private getMaxNumberOfConnectors(): number {
 813     let maxConnectors = 0;
 814     if (!Utils.isEmptyArray(this.stationInfo.numberOfConnectors)) {
 815       const numberOfConnectors = this.stationInfo.numberOfConnectors as number[];
 816       // Distribute evenly the number of connectors
 817       maxConnectors = numberOfConnectors[(this.index - 1) % numberOfConnectors.length];
 818     } else if (!Utils.isUndefined(this.stationInfo.numberOfConnectors)) {
 819       maxConnectors = this.stationInfo.numberOfConnectors as number;
 820     } else {
 821       maxConnectors = this.stationInfo.Connectors[0] ? this.getTemplateMaxNumberOfConnectors() - 1 : this.getTemplateMaxNumberOfConnectors();
 822     }
 823     return maxConnectors;
 824   }
 825
 826   private getNumberOfConnectors(): number {
 827     return this.connectors[0] ? Object.keys(this.connectors).length - 1 : Object.keys(this.connectors).length;
 828   }
 829
 830   private async startMessageSequence(): Promise<void> {
 831     // Start WebSocket ping
 832     this.startWebSocketPing();
 833     // Start heartbeat
 834     this.startHeartbeat();
 835     // Initialize connectors status
 836     for (const connector in this.connectors) {
 837       if (Utils.convertToInt(connector) === 0) {
 838         continue;
 839       } else if (!this.hasStopped && !this.getConnector(Utils.convertToInt(connector))?.status && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 840         // Send status in template at startup
 841         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 842         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 843       } else if (this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 844         // Send status in template after reset
 845         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 846         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 847       } else if (!this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.status) {
 848         // Send previous status at template reload
 849         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).status);
 850       } else {
 851         // Send default status
 852         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.AVAILABLE);
 853         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.AVAILABLE;
 854       }
 855     }
 856     // Start the ATG
 857     this.startAutomaticTransactionGenerator();
 858     if (this.getEnableStatistics()) {
 859       this.performanceStatistics.start();
 860     }
 861   }
 862
 863   private startAutomaticTransactionGenerator() {
 864     if (this.stationInfo.AutomaticTransactionGenerator.enable) {
 865       if (!this.automaticTransactionGeneration) {
 866         this.automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 867       }
 868       if (this.automaticTransactionGeneration.timeToStop) {
 869         // The ATG might sleep
 870         void this.automaticTransactionGeneration.start();
 871       }
 872     }
 873   }
 874
 875   private async stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 876     // Stop WebSocket ping
 877     this.stopWebSocketPing();
 878     // Stop heartbeat
 879     this.stopHeartbeat();
 880     // Stop the ATG
 881     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
 882       this.automaticTransactionGeneration &&
 883       !this.automaticTransactionGeneration.timeToStop) {
 884       await this.automaticTransactionGeneration.stop(reason);
 885     } else {
 886       for (const connector in this.connectors) {
 887         if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 888           const transactionId = this.getConnector(Utils.convertToInt(connector)).transactionId;
 889           await this.ocppRequestService.sendStopTransaction(transactionId, this.getEnergyActiveImportRegisterByTransactionId(transactionId),
 890             this.getTransactionIdTag(transactionId), reason);
 891         }
 892       }
 893     }
 894   }
 895
 896   private startWebSocketPing(): void {
 897     const webSocketPingInterval: number = this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval)
 898       ? Utils.convertToInt(this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval).value)
 899       : 0;
 900     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
 901       this.webSocketPingSetInterval = setInterval(() => {
 902         if (this.isWebSocketOpen()) {
 903           this.wsConnection.ping((): void => { });
 904         }
 905       }, webSocketPingInterval * 1000);
 906       logger.info(this.logPrefix() + ' WebSocket ping started every ' + Utils.secondsToHHMMSS(webSocketPingInterval));
 907     } else if (this.webSocketPingSetInterval) {
 908       logger.info(this.logPrefix() + ' WebSocket ping every ' + Utils.secondsToHHMMSS(webSocketPingInterval) + ' already started');
 909     } else {
 910       logger.error(`${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.secondsToHHMMSS(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
 911     }
 912   }
 913
 914   private stopWebSocketPing(): void {
 915     if (this.webSocketPingSetInterval) {
 916       clearInterval(this.webSocketPingSetInterval);
 917     }
 918   }
 919
 920   private getSupervisionURL(): string {
 921     const supervisionUrls = Utils.cloneObject<string | string[]>(this.stationInfo.supervisionURL ? this.stationInfo.supervisionURL : Configuration.getSupervisionURLs());
 922     let indexUrl = 0;
 923     if (!Utils.isEmptyArray(supervisionUrls)) {
 924       if (Configuration.getDistributeStationsToTenantsEqually()) {
 925         indexUrl = this.index % supervisionUrls.length;
 926       } else {
 927         // Get a random url
 928         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 929       }
 930       return supervisionUrls[indexUrl];
 931     }
 932     return supervisionUrls as string;
 933   }
 934
 935   private getHeartbeatInterval(): number | undefined {
 936     const HeartbeatInterval = this.getConfigurationKey(StandardParametersKey.HeartbeatInterval);
 937     if (HeartbeatInterval) {
 938       return Utils.convertToInt(HeartbeatInterval.value) * 1000;
 939     }
 940     const HeartBeatInterval = this.getConfigurationKey(StandardParametersKey.HeartBeatInterval);
 941     if (HeartBeatInterval) {
 942       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
 943     }
 944     !this.stationInfo.autoRegister && logger.warn(`${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${Constants.DEFAULT_HEARTBEAT_INTERVAL}`);
 945     return Constants.DEFAULT_HEARTBEAT_INTERVAL;
 946   }
 947
 948   private stopHeartbeat(): void {
 949     if (this.heartbeatSetInterval) {
 950       clearInterval(this.heartbeatSetInterval);
 951     }
 952   }
 953
 954   private openWSConnection(options?: WebSocket.ClientOptions, forceCloseOpened = false): void {
 955     options ?? {} as WebSocket.ClientOptions;
 956     options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
 957     if (this.isWebSocketOpen() && forceCloseOpened) {
 958       this.wsConnection.close();
 959     }
 960     let protocol;
 961     switch (this.getOCPPVersion()) {
 962       case OCPPVersion.VERSION_16:
 963         protocol = 'ocpp' + OCPPVersion.VERSION_16;
 964         break;
 965       default:
 966         this.handleUnsupportedVersion(this.getOCPPVersion());
 967         break;
 968     }
 969     this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
 970     logger.info(this.logPrefix() + ' Will communicate through URL ' + this.supervisionUrl);
 971   }
 972
 973   private stopMeterValues(connectorId: number) {
 974     if (this.getConnector(connectorId)?.transactionSetInterval) {
 975       clearInterval(this.getConnector(connectorId).transactionSetInterval);
 976     }
 977   }
 978
 979   private startAuthorizationFileMonitoring(): void {
 980     const authorizationFile = this.getAuthorizationFile();
 981     if (authorizationFile) {
 982       try {
 983         fs.watch(authorizationFile).on('change', () => {
 984           try {
 985             logger.debug(this.logPrefix() + ' Authorization file ' + authorizationFile + ' have changed, reload');
 986             // Initialize authorizedTags
 987             this.authorizedTags = this.getAuthorizedTags();
 988           } catch (error) {
 989             logger.error(this.logPrefix() + ' Authorization file monitoring error: %j', error);
 990           }
 991         });
 992       } catch (error) {
 993         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error);
 994       }
 995     } else {
 996       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile + '. Not monitoring changes');
 997     }
 998   }
 999
1000   private startStationTemplateFileMonitoring(): void {
1001     try {
1002       // eslint-disable-next-line @typescript-eslint/no-misused-promises
1003       fs.watch(this.stationTemplateFile).on('change', async (): Promise<void> => {
1004         try {
1005           logger.debug(this.logPrefix() + ' Template file ' + this.stationTemplateFile + ' have changed, reload');
1006           // Initialize
1007           this.initialize();
1008           // Stop the ATG
1009           if (!this.stationInfo.AutomaticTransactionGenerator.enable &&
1010           this.automaticTransactionGeneration) {
1011             await this.automaticTransactionGeneration.stop();
1012           }
1013           // Start the ATG
1014           this.startAutomaticTransactionGenerator();
1015           // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
1016         } catch (error) {
1017           logger.error(this.logPrefix() + ' Charging station template file monitoring error: %j', error);
1018         }
1019       });
1020     } catch (error) {
1021       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error);
1022     }
1023   }
1024
1025   private getReconnectExponentialDelay(): boolean | undefined {
1026     return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay) ? this.stationInfo.reconnectExponentialDelay : false;
1027   }
1028
1029   private async reconnect(error: any): Promise<void> {
1030     // Stop heartbeat
1031     this.stopHeartbeat();
1032     // Stop the ATG if needed
1033     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
1034       this.stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
1035       this.automaticTransactionGeneration &&
1036       !this.automaticTransactionGeneration.timeToStop) {
1037       await this.automaticTransactionGeneration.stop();
1038     }
1039     if (this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() || this.getAutoReconnectMaxRetries() === -1) {
1040       this.autoReconnectRetryCount++;
1041       const reconnectDelay = (this.getReconnectExponentialDelay() ? Utils.exponentialDelay(this.autoReconnectRetryCount) : this.getConnectionTimeout() * 1000);
1042       logger.error(`${this.logPrefix()} Socket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectDelay - 100}ms`);
1043       await Utils.sleep(reconnectDelay);
1044       logger.error(this.logPrefix() + ' Socket: reconnecting try #' + this.autoReconnectRetryCount.toString());
1045       this.openWSConnection({ handshakeTimeout: reconnectDelay - 100 });
1046       this.hasSocketRestarted = true;
1047     } else if (this.getAutoReconnectMaxRetries() !== -1) {
1048       logger.error(`${this.logPrefix()} Socket reconnect failure: max retries reached (${this.autoReconnectRetryCount}) or retry disabled (${this.getAutoReconnectMaxRetries()})`);
1049     }
1050   }
1051
1052   private initTransactionAttributesOnConnector(connectorId: number): void {
1053     this.getConnector(connectorId).authorized = false;
1054     this.getConnector(connectorId).transactionStarted = false;
1055     this.getConnector(connectorId).energyActiveImportRegisterValue = 0;
1056     this.getConnector(connectorId).transactionEnergyActiveImportRegisterValue = 0;
1057   }
1058 }
1059