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