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 (phase && sampledValueTemplates[index]?.phase === phase && sampledValueTemplates[index]?.measurand === measurand
 232           && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 233         return sampledValueTemplates[index];
 234       } else if (!phase && !sampledValueTemplates[index].phase && sampledValueTemplates[index]?.measurand === measurand
 235                  && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
 236         return sampledValueTemplates[index];
 237       } else if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
 238                  && (!sampledValueTemplates[index].measurand || sampledValueTemplates[index].measurand === measurand)) {
 239         return sampledValueTemplates[index];
 240       }
 241     }
 242     if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
 243       logger.error(`${this.logPrefix()} Missing MeterValues for default measurand ${measurand} in template on connectorId ${connectorId}`);
 244     }
 245     logger.debug(`${this.logPrefix()} No MeterValues for measurand ${measurand} ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
 246   }
 247
 248   public getAutomaticTransactionGeneratorRequireAuthorize(): boolean {
 249     return this.stationInfo.AutomaticTransactionGenerator.requireAuthorize ?? true;
 250   }
 251
 252   public startHeartbeat(): void {
 253     if (this.getHeartbeatInterval() && this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
 254       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 255       this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
 256         await this.ocppRequestService.sendHeartbeat();
 257       }, this.getHeartbeatInterval());
 258       logger.info(this.logPrefix() + ' Heartbeat started every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()));
 259     } else if (this.heartbeatSetInterval) {
 260       logger.info(this.logPrefix() + ' Heartbeat already started every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()));
 261     } else {
 262       logger.error(`${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval() ? Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()) : this.getHeartbeatInterval()}, not starting the heartbeat`);
 263     }
 264   }
 265
 266   public restartHeartbeat(): void {
 267     // Stop heartbeat
 268     this.stopHeartbeat();
 269     // Start heartbeat
 270     this.startHeartbeat();
 271   }
 272
 273   public startMeterValues(connectorId: number, interval: number): void {
 274     if (connectorId === 0) {
 275       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`);
 276       return;
 277     }
 278     if (!this.getConnector(connectorId)) {
 279       logger.error(`${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`);
 280       return;
 281     }
 282     if (!this.getConnector(connectorId)?.transactionStarted) {
 283       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
 284       return;
 285     } else if (this.getConnector(connectorId)?.transactionStarted && !this.getConnector(connectorId)?.transactionId) {
 286       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
 287       return;
 288     }
 289     if (interval > 0) {
 290       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 291       this.getConnector(connectorId).transactionSetInterval = setInterval(async (): Promise<void> => {
 292         if (this.getEnableStatistics()) {
 293           const sendMeterValues = performance.timerify(this.ocppRequestService.sendMeterValues);
 294           this.performanceObserver.observe({
 295             entryTypes: ['function'],
 296           });
 297           await sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 298         } else {
 299           await this.ocppRequestService.sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 300         }
 301       }, interval);
 302     } else {
 303       logger.error(`${this.logPrefix()} Charging station ${StandardParametersKey.MeterValueSampleInterval} configuration set to ${interval ? Utils.milliSecondsToHHMMSS(interval) : interval}, not sending MeterValues`);
 304     }
 305   }
 306
 307   public start(): void {
 308     this.openWSConnection();
 309     // Monitor authorization file
 310     this.startAuthorizationFileMonitoring();
 311     // Monitor station template file
 312     this.startStationTemplateFileMonitoring();
 313     // Handle Socket incoming messages
 314     this.wsConnection.on('message', this.onMessage.bind(this));
 315     // Handle Socket error
 316     this.wsConnection.on('error', this.onError.bind(this));
 317     // Handle Socket close
 318     this.wsConnection.on('close', this.onClose.bind(this));
 319     // Handle Socket opening connection
 320     this.wsConnection.on('open', this.onOpen.bind(this));
 321     // Handle Socket ping
 322     this.wsConnection.on('ping', this.onPing.bind(this));
 323     // Handle Socket pong
 324     this.wsConnection.on('pong', this.onPong.bind(this));
 325   }
 326
 327   public async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 328     // Stop message sequence
 329     await this.stopMessageSequence(reason);
 330     for (const connector in this.connectors) {
 331       if (Utils.convertToInt(connector) > 0) {
 332         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.UNAVAILABLE);
 333         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.UNAVAILABLE;
 334       }
 335     }
 336     if (this.isWebSocketOpen()) {
 337       this.wsConnection.close();
 338     }
 339     this.bootNotificationResponse = null;
 340     this.hasStopped = true;
 341   }
 342
 343   public getConfigurationKey(key: string | StandardParametersKey, caseInsensitive = false): ConfigurationKey | undefined {
 344     const configurationKey: ConfigurationKey | undefined = this.configuration.configurationKey.find((configElement) => {
 345       if (caseInsensitive) {
 346         return configElement.key.toLowerCase() === key.toLowerCase();
 347       }
 348       return configElement.key === key;
 349     });
 350     return configurationKey;
 351   }
 352
 353   public addConfigurationKey(key: string | StandardParametersKey, value: string, readonly = false, visible = true, reboot = false): void {
 354     const keyFound = this.getConfigurationKey(key);
 355     if (!keyFound) {
 356       this.configuration.configurationKey.push({
 357         key,
 358         readonly,
 359         value,
 360         visible,
 361         reboot,
 362       });
 363     } else {
 364       logger.error(`${this.logPrefix()} Trying to add an already existing configuration key: %j`, keyFound);
 365     }
 366   }
 367
 368   public setConfigurationKeyValue(key: string | StandardParametersKey, value: string): void {
 369     const keyFound = this.getConfigurationKey(key);
 370     if (keyFound) {
 371       const keyIndex = this.configuration.configurationKey.indexOf(keyFound);
 372       this.configuration.configurationKey[keyIndex].value = value;
 373     } else {
 374       logger.error(`${this.logPrefix()} Trying to set a value on a non existing configuration key: %j`, { key, value });
 375     }
 376   }
 377
 378   public setChargingProfile(connectorId: number, cp: ChargingProfile): void {
 379     let cpReplaced = false;
 380     if (!Utils.isEmptyArray(this.getConnector(connectorId).chargingProfiles)) {
 381       this.getConnector(connectorId).chargingProfiles?.forEach((chargingProfile: ChargingProfile, index: number) => {
 382         if (chargingProfile.chargingProfileId === cp.chargingProfileId
 383             || (chargingProfile.stackLevel === cp.stackLevel && chargingProfile.chargingProfilePurpose === cp.chargingProfilePurpose)) {
 384           this.getConnector(connectorId).chargingProfiles[index] = cp;
 385           cpReplaced = true;
 386         }
 387       });
 388     }
 389     !cpReplaced && this.getConnector(connectorId).chargingProfiles?.push(cp);
 390   }
 391
 392   public resetTransactionOnConnector(connectorId: number): void {
 393     this.getConnector(connectorId).authorized = false;
 394     this.getConnector(connectorId).transactionStarted = false;
 395     delete this.getConnector(connectorId).authorizeIdTag;
 396     delete this.getConnector(connectorId).transactionId;
 397     delete this.getConnector(connectorId).transactionIdTag;
 398     this.getConnector(connectorId).transactionEnergyActiveImportRegisterValue = 0;
 399     delete this.getConnector(connectorId).transactionBeginMeterValue;
 400     this.stopMeterValues(connectorId);
 401   }
 402
 403   public addToMessageQueue(message: string): void {
 404     let dups = false;
 405     // Handle dups in message queue
 406     for (const bufferedMessage of this.messageQueue) {
 407       // Message already in the queue
 408       if (message === bufferedMessage) {
 409         dups = true;
 410         break;
 411       }
 412     }
 413     if (!dups) {
 414       // Queue message
 415       this.messageQueue.push(message);
 416     }
 417   }
 418
 419   private flushMessageQueue() {
 420     if (!Utils.isEmptyArray(this.messageQueue)) {
 421       this.messageQueue.forEach((message, index) => {
 422         this.messageQueue.splice(index, 1);
 423         this.wsConnection.send(message);
 424       });
 425     }
 426   }
 427
 428   private getChargingStationId(stationTemplate: ChargingStationTemplate): string {
 429     // In case of multiple instances: add instance index to charging station id
 430     let instanceIndex = process.env.CF_INSTANCE_INDEX ?? 0;
 431     instanceIndex = instanceIndex > 0 ? instanceIndex : '';
 432     const idSuffix = stationTemplate.nameSuffix ?? '';
 433     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + instanceIndex.toString() + ('000000000' + this.index.toString()).substr(('000000000' + this.index.toString()).length - 4) + idSuffix;
 434   }
 435
 436   private buildStationInfo(): ChargingStationInfo {
 437     let stationTemplateFromFile: ChargingStationTemplate;
 438     try {
 439       // Load template file
 440       const fileDescriptor = fs.openSync(this.stationTemplateFile, 'r');
 441       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
 442       fs.closeSync(fileDescriptor);
 443     } catch (error) {
 444       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error);
 445     }
 446     const stationInfo: ChargingStationInfo = stationTemplateFromFile ?? {} as ChargingStationInfo;
 447     if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
 448       stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
 449       const powerArrayRandomIndex = Math.floor(Math.random() * stationTemplateFromFile.power.length);
 450       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 451         ? stationTemplateFromFile.power[powerArrayRandomIndex] * 1000
 452         : stationTemplateFromFile.power[powerArrayRandomIndex];
 453     } else {
 454       stationTemplateFromFile.power = stationTemplateFromFile.power as number;
 455       stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
 456         ? stationTemplateFromFile.power * 1000
 457         : stationTemplateFromFile.power;
 458     }
 459     delete stationInfo.power;
 460     delete stationInfo.powerUnit;
 461     stationInfo.chargingStationId = this.getChargingStationId(stationTemplateFromFile);
 462     stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
 463     return stationInfo;
 464   }
 465
 466   private getOCPPVersion(): OCPPVersion {
 467     return this.stationInfo.ocppVersion ? this.stationInfo.ocppVersion : OCPPVersion.VERSION_16;
 468   }
 469
 470   private handleUnsupportedVersion(version: OCPPVersion) {
 471     const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${this.stationTemplateFile}`;
 472     logger.error(errMsg);
 473     throw new Error(errMsg);
 474   }
 475
 476   private initialize(): void {
 477     this.stationInfo = this.buildStationInfo();
 478     this.bootNotificationRequest = {
 479       chargePointModel: this.stationInfo.chargePointModel,
 480       chargePointVendor: this.stationInfo.chargePointVendor,
 481       ...!Utils.isUndefined(this.stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this.stationInfo.chargeBoxSerialNumberPrefix },
 482       ...!Utils.isUndefined(this.stationInfo.firmwareVersion) && { firmwareVersion: this.stationInfo.firmwareVersion },
 483     };
 484     this.configuration = this.getTemplateChargingStationConfiguration();
 485     this.supervisionUrl = this.getSupervisionURL();
 486     this.wsConnectionUrl = this.supervisionUrl + '/' + this.stationInfo.chargingStationId;
 487     // Build connectors if needed
 488     const maxConnectors = this.getMaxNumberOfConnectors();
 489     if (maxConnectors <= 0) {
 490       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with ${maxConnectors} connectors`);
 491     }
 492     const templateMaxConnectors = this.getTemplateMaxNumberOfConnectors();
 493     if (templateMaxConnectors <= 0) {
 494       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector configuration`);
 495     }
 496     if (!this.stationInfo.Connectors[0]) {
 497       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector Id 0 configuration`);
 498     }
 499     // Sanity check
 500     if (maxConnectors > (this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this.stationInfo.randomConnectors) {
 501       logger.warn(`${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this.stationTemplateFile}, forcing random connector configurations affectation`);
 502       this.stationInfo.randomConnectors = true;
 503     }
 504     const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this.stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
 505     // FIXME: Handle shrinking the number of connectors
 506     if (!this.connectors || (this.connectors && this.connectorsConfigurationHash !== connectorsConfigHash)) {
 507       this.connectorsConfigurationHash = connectorsConfigHash;
 508       // Add connector Id 0
 509       let lastConnector = '0';
 510       for (lastConnector in this.stationInfo.Connectors) {
 511         if (Utils.convertToInt(lastConnector) === 0 && this.getUseConnectorId0() && this.stationInfo.Connectors[lastConnector]) {
 512           this.connectors[lastConnector] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[lastConnector]);
 513           this.connectors[lastConnector].availability = AvailabilityType.OPERATIVE;
 514           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 515             this.connectors[lastConnector].chargingProfiles = [];
 516           }
 517         }
 518       }
 519       // Generate all connectors
 520       if ((this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
 521         for (let index = 1; index <= maxConnectors; index++) {
 522           const randConnectorId = this.stationInfo.randomConnectors ? Utils.getRandomInt(Utils.convertToInt(lastConnector), 1) : index;
 523           this.connectors[index] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[randConnectorId]);
 524           this.connectors[index].availability = AvailabilityType.OPERATIVE;
 525           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 526             this.connectors[index].chargingProfiles = [];
 527           }
 528         }
 529       }
 530     }
 531     // Avoid duplication of connectors related information
 532     delete this.stationInfo.Connectors;
 533     // Initialize transaction attributes on connectors
 534     for (const connector in this.connectors) {
 535       if (Utils.convertToInt(connector) > 0 && !this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 536         this.initTransactionAttributesOnConnector(Utils.convertToInt(connector));
 537       }
 538     }
 539     switch (this.getOCPPVersion()) {
 540       case OCPPVersion.VERSION_16:
 541         this.ocppIncomingRequestService = new OCPP16IncomingRequestService(this);
 542         this.ocppRequestService = new OCPP16RequestService(this, new OCPP16ResponseService(this));
 543         break;
 544       default:
 545         this.handleUnsupportedVersion(this.getOCPPVersion());
 546         break;
 547     }
 548     // OCPP parameters
 549     this.initOCPPParameters();
 550     this.stationInfo.powerDivider = this.getPowerDivider();
 551     if (this.getEnableStatistics()) {
 552       this.performanceStatistics = new PerformanceStatistics(this.stationInfo.chargingStationId);
 553       this.performanceObserver = new PerformanceObserver((list) => {
 554         const entry = list.getEntries()[0];
 555         this.performanceStatistics.logPerformance(entry, Constants.ENTITY_CHARGING_STATION);
 556         this.performanceObserver.disconnect();
 557       });
 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()} Is connected to server through ${this.wsConnectionUrl}`);
 600     if (!this.isRegistered()) {
 601       // Send BootNotification
 602       let registrationRetryCount = 0;
 603       do {
 604         this.bootNotificationResponse = await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel,
 605           this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
 606         if (!this.isRegistered()) {
 607           registrationRetryCount++;
 608           await Utils.sleep(this.bootNotificationResponse?.interval ? this.bootNotificationResponse.interval * 1000 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL);
 609         }
 610       } while (!this.isRegistered() && (registrationRetryCount <= this.getRegistrationMaxRetries() || this.getRegistrationMaxRetries() === -1));
 611     }
 612     if (this.isRegistered()) {
 613       await this.startMessageSequence();
 614       this.hasStopped && (this.hasStopped = false);
 615       if (this.hasSocketRestarted && this.isWebSocketOpen()) {
 616         this.flushMessageQueue();
 617       }
 618     } else {
 619       logger.error(`${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       // Parse the message
 647       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(messageEvent.toString()) as IncomingRequest;
 648       // Check the Type of message
 649       switch (messageType) {
 650         // Incoming Message
 651         case MessageType.CALL_MESSAGE:
 652           if (this.getEnableStatistics()) {
 653             this.performanceStatistics.addMessage(commandName, messageType);
 654           }
 655           // Process the call
 656           await this.ocppIncomingRequestService.handleRequest(messageId, commandName, commandPayload);
 657           break;
 658         // Outcome Message
 659         case MessageType.CALL_RESULT_MESSAGE:
 660           // Respond
 661           if (Utils.isIterable(this.requests[messageId])) {
 662             [responseCallback, , requestPayload] = this.requests[messageId];
 663           } else {
 664             throw new Error(`Response request for message id ${messageId} is not iterable`);
 665           }
 666           if (!responseCallback) {
 667             // Error
 668             throw new Error(`Response request for unknown message id ${messageId}`);
 669           }
 670           delete this.requests[messageId];
 671           responseCallback(commandName, requestPayload);
 672           break;
 673         // Error Message
 674         case MessageType.CALL_ERROR_MESSAGE:
 675           if (!this.requests[messageId]) {
 676             // Error
 677             throw new Error(`Error request for unknown message id ${messageId}`);
 678           }
 679           if (Utils.isIterable(this.requests[messageId])) {
 680             [, rejectCallback] = this.requests[messageId];
 681           } else {
 682             throw new Error(`Error request for message id ${messageId} is not iterable`);
 683           }
 684           delete this.requests[messageId];
 685           rejectCallback(new OCPPError(commandName, commandPayload.toString(), errorDetails));
 686           break;
 687         // Error
 688         default:
 689           errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
 690           logger.error(errMsg);
 691           throw new Error(errMsg);
 692       }
 693     } catch (error) {
 694       // Log
 695       logger.error('%s Incoming message %j processing error %j on request content type %j', this.logPrefix(), messageEvent, error, this.requests[messageId]);
 696       // Send error
 697       messageType !== MessageType.CALL_ERROR_MESSAGE && await this.ocppRequestService.sendError(messageId, error, commandName);
 698     }
 699   }
 700
 701   private onPing(): void {
 702     logger.debug(this.logPrefix() + ' Has received a WS ping (rfc6455) from the server');
 703   }
 704
 705   private onPong(): void {
 706     logger.debug(this.logPrefix() + ' Has received a WS pong (rfc6455) from the server');
 707   }
 708
 709   private async onError(errorEvent: any): Promise<void> {
 710     logger.error(this.logPrefix() + ' Socket error: %j', errorEvent);
 711     // switch (errorEvent.code) {
 712     //   case 'ECONNREFUSED':
 713     //     await this._reconnect(errorEvent);
 714     //     break;
 715     // }
 716   }
 717
 718   private getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
 719     return this.stationInfo.Configuration ? this.stationInfo.Configuration : {} as ChargingStationConfiguration;
 720   }
 721
 722   private getAuthorizationFile(): string | undefined {
 723     return this.stationInfo.authorizationFile && path.join(path.resolve(__dirname, '../'), 'assets', path.basename(this.stationInfo.authorizationFile));
 724   }
 725
 726   private getAuthorizedTags(): string[] {
 727     let authorizedTags: string[] = [];
 728     const authorizationFile = this.getAuthorizationFile();
 729     if (authorizationFile) {
 730       try {
 731         // Load authorization file
 732         const fileDescriptor = fs.openSync(authorizationFile, 'r');
 733         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
 734         fs.closeSync(fileDescriptor);
 735       } catch (error) {
 736         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error);
 737       }
 738     } else {
 739       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile);
 740     }
 741     return authorizedTags;
 742   }
 743
 744   private getUseConnectorId0(): boolean | undefined {
 745     return !Utils.isUndefined(this.stationInfo.useConnectorId0) ? this.stationInfo.useConnectorId0 : true;
 746   }
 747
 748   private getNumberOfRunningTransactions(): number {
 749     let trxCount = 0;
 750     for (const connector in this.connectors) {
 751       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 752         trxCount++;
 753       }
 754     }
 755     return trxCount;
 756   }
 757
 758   // 0 for disabling
 759   private getConnectionTimeout(): number | undefined {
 760     if (this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
 761       return parseInt(this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut).value) ?? Constants.DEFAULT_CONNECTION_TIMEOUT;
 762     }
 763     return Constants.DEFAULT_CONNECTION_TIMEOUT;
 764   }
 765
 766   // -1 for unlimited, 0 for disabling
 767   private getAutoReconnectMaxRetries(): number | undefined {
 768     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
 769       return this.stationInfo.autoReconnectMaxRetries;
 770     }
 771     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
 772       return Configuration.getAutoReconnectMaxRetries();
 773     }
 774     return -1;
 775   }
 776
 777   // 0 for disabling
 778   private getRegistrationMaxRetries(): number | undefined {
 779     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
 780       return this.stationInfo.registrationMaxRetries;
 781     }
 782     return -1;
 783   }
 784
 785   private getPowerDivider(): number {
 786     let powerDivider = this.getNumberOfConnectors();
 787     if (this.stationInfo.powerSharedByConnectors) {
 788       powerDivider = this.getNumberOfRunningTransactions();
 789     }
 790     return powerDivider;
 791   }
 792
 793   private getTemplateMaxNumberOfConnectors(): number {
 794     return Object.keys(this.stationInfo.Connectors).length;
 795   }
 796
 797   private getMaxNumberOfConnectors(): number {
 798     let maxConnectors = 0;
 799     if (!Utils.isEmptyArray(this.stationInfo.numberOfConnectors)) {
 800       const numberOfConnectors = this.stationInfo.numberOfConnectors as number[];
 801       // Distribute evenly the number of connectors
 802       maxConnectors = numberOfConnectors[(this.index - 1) % numberOfConnectors.length];
 803     } else if (!Utils.isUndefined(this.stationInfo.numberOfConnectors)) {
 804       maxConnectors = this.stationInfo.numberOfConnectors as number;
 805     } else {
 806       maxConnectors = this.stationInfo.Connectors[0] ? this.getTemplateMaxNumberOfConnectors() - 1 : this.getTemplateMaxNumberOfConnectors();
 807     }
 808     return maxConnectors;
 809   }
 810
 811   private getNumberOfConnectors(): number {
 812     return this.connectors[0] ? Object.keys(this.connectors).length - 1 : Object.keys(this.connectors).length;
 813   }
 814
 815   private async startMessageSequence(): Promise<void> {
 816     // Start WebSocket ping
 817     this.startWebSocketPing();
 818     // Start heartbeat
 819     this.startHeartbeat();
 820     // Initialize connectors status
 821     for (const connector in this.connectors) {
 822       if (Utils.convertToInt(connector) === 0) {
 823         continue;
 824       } else if (!this.hasStopped && !this.getConnector(Utils.convertToInt(connector))?.status && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 825         // Send status in template at startup
 826         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 827         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 828       } else if (this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 829         // Send status in template after reset
 830         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 831         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 832       } else if (!this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.status) {
 833         // Send previous status at template reload
 834         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).status);
 835       } else {
 836         // Send default status
 837         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.AVAILABLE);
 838         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.AVAILABLE;
 839       }
 840     }
 841     // Start the ATG
 842     this.startAutomaticTransactionGenerator();
 843     if (this.getEnableStatistics()) {
 844       this.performanceStatistics.start();
 845     }
 846   }
 847
 848   private startAutomaticTransactionGenerator() {
 849     if (this.stationInfo.AutomaticTransactionGenerator.enable) {
 850       if (!this.automaticTransactionGeneration) {
 851         this.automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 852       }
 853       if (this.automaticTransactionGeneration.timeToStop) {
 854         // The ATG might sleep
 855         void this.automaticTransactionGeneration.start();
 856       }
 857     }
 858   }
 859
 860   private async stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 861     // Stop WebSocket ping
 862     this.stopWebSocketPing();
 863     // Stop heartbeat
 864     this.stopHeartbeat();
 865     // Stop the ATG
 866     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
 867       this.automaticTransactionGeneration &&
 868       !this.automaticTransactionGeneration.timeToStop) {
 869       await this.automaticTransactionGeneration.stop(reason);
 870     } else {
 871       for (const connector in this.connectors) {
 872         if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 873           const transactionId = this.getConnector(Utils.convertToInt(connector)).transactionId;
 874           await this.ocppRequestService.sendStopTransaction(transactionId, this.getEnergyActiveImportRegisterByTransactionId(transactionId),
 875             this.getTransactionIdTag(transactionId), reason);
 876         }
 877       }
 878     }
 879   }
 880
 881   private startWebSocketPing(): void {
 882     const webSocketPingInterval: number = this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval)
 883       ? Utils.convertToInt(this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval).value)
 884       : 0;
 885     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
 886       this.webSocketPingSetInterval = setInterval(() => {
 887         if (this.isWebSocketOpen()) {
 888           this.wsConnection.ping((): void => { });
 889         }
 890       }, webSocketPingInterval * 1000);
 891       logger.info(this.logPrefix() + ' WebSocket ping started every ' + Utils.secondsToHHMMSS(webSocketPingInterval));
 892     } else if (this.webSocketPingSetInterval) {
 893       logger.info(this.logPrefix() + ' WebSocket ping every ' + Utils.secondsToHHMMSS(webSocketPingInterval) + ' already started');
 894     } else {
 895       logger.error(`${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.secondsToHHMMSS(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
 896     }
 897   }
 898
 899   private stopWebSocketPing(): void {
 900     if (this.webSocketPingSetInterval) {
 901       clearInterval(this.webSocketPingSetInterval);
 902     }
 903   }
 904
 905   private getSupervisionURL(): string {
 906     const supervisionUrls = Utils.cloneObject<string | string[]>(this.stationInfo.supervisionURL ? this.stationInfo.supervisionURL : Configuration.getSupervisionURLs());
 907     let indexUrl = 0;
 908     if (!Utils.isEmptyArray(supervisionUrls)) {
 909       if (Configuration.getDistributeStationsToTenantsEqually()) {
 910         indexUrl = this.index % supervisionUrls.length;
 911       } else {
 912         // Get a random url
 913         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 914       }
 915       return supervisionUrls[indexUrl];
 916     }
 917     return supervisionUrls as string;
 918   }
 919
 920   private getHeartbeatInterval(): number | undefined {
 921     const HeartbeatInterval = this.getConfigurationKey(StandardParametersKey.HeartbeatInterval);
 922     if (HeartbeatInterval) {
 923       return Utils.convertToInt(HeartbeatInterval.value) * 1000;
 924     }
 925     const HeartBeatInterval = this.getConfigurationKey(StandardParametersKey.HeartBeatInterval);
 926     if (HeartBeatInterval) {
 927       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
 928     }
 929   }
 930
 931   private stopHeartbeat(): void {
 932     if (this.heartbeatSetInterval) {
 933       clearInterval(this.heartbeatSetInterval);
 934     }
 935   }
 936
 937   private openWSConnection(options?: WebSocket.ClientOptions, forceCloseOpened = false): void {
 938     options ?? {} as WebSocket.ClientOptions;
 939     options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
 940     if (this.isWebSocketOpen() && forceCloseOpened) {
 941       this.wsConnection.close();
 942     }
 943     let protocol;
 944     switch (this.getOCPPVersion()) {
 945       case OCPPVersion.VERSION_16:
 946         protocol = 'ocpp' + OCPPVersion.VERSION_16;
 947         break;
 948       default:
 949         this.handleUnsupportedVersion(this.getOCPPVersion());
 950         break;
 951     }
 952     this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
 953     logger.info(this.logPrefix() + ' Will communicate through URL ' + this.supervisionUrl);
 954   }
 955
 956   private stopMeterValues(connectorId: number) {
 957     if (this.getConnector(connectorId)?.transactionSetInterval) {
 958       clearInterval(this.getConnector(connectorId).transactionSetInterval);
 959     }
 960   }
 961
 962   private startAuthorizationFileMonitoring(): void {
 963     const authorizationFile = this.getAuthorizationFile();
 964     if (authorizationFile) {
 965       try {
 966         fs.watch(authorizationFile).on('change', () => {
 967           try {
 968             logger.debug(this.logPrefix() + ' Authorization file ' + authorizationFile + ' have changed, reload');
 969             // Initialize authorizedTags
 970             this.authorizedTags = this.getAuthorizedTags();
 971           } catch (error) {
 972             logger.error(this.logPrefix() + ' Authorization file monitoring error: %j', error);
 973           }
 974         });
 975       } catch (error) {
 976         FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error);
 977       }
 978     } else {
 979       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile + '. Not monitoring changes');
 980     }
 981   }
 982
 983   private startStationTemplateFileMonitoring(): void {
 984     try {
 985       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 986       fs.watch(this.stationTemplateFile).on('change', async (): Promise<void> => {
 987         try {
 988           logger.debug(this.logPrefix() + ' Template file ' + this.stationTemplateFile + ' have changed, reload');
 989           // Initialize
 990           this.initialize();
 991           // Stop the ATG
 992           if (!this.stationInfo.AutomaticTransactionGenerator.enable &&
 993           this.automaticTransactionGeneration) {
 994             await this.automaticTransactionGeneration.stop();
 995           }
 996           // Start the ATG
 997           this.startAutomaticTransactionGenerator();
 998           // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
 999         } catch (error) {
1000           logger.error(this.logPrefix() + ' Charging station template file monitoring error: %j', error);
1001         }
1002       });
1003     } catch (error) {
1004       FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error);
1005     }
1006   }
1007
1008   private getReconnectExponentialDelay(): boolean | undefined {
1009     return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay) ? this.stationInfo.reconnectExponentialDelay : false;
1010   }
1011
1012   private async reconnect(error: any): Promise<void> {
1013     // Stop heartbeat
1014     this.stopHeartbeat();
1015     // Stop the ATG if needed
1016     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
1017       this.stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
1018       this.automaticTransactionGeneration &&
1019       !this.automaticTransactionGeneration.timeToStop) {
1020       await this.automaticTransactionGeneration.stop();
1021     }
1022     if (this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() || this.getAutoReconnectMaxRetries() === -1) {
1023       this.autoReconnectRetryCount++;
1024       const reconnectDelay = (this.getReconnectExponentialDelay() ? Utils.exponentialDelay(this.autoReconnectRetryCount) : this.getConnectionTimeout() * 1000);
1025       logger.error(`${this.logPrefix()} Socket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectDelay - 100}ms`);
1026       await Utils.sleep(reconnectDelay);
1027       logger.error(this.logPrefix() + ' Socket: reconnecting try #' + this.autoReconnectRetryCount.toString());
1028       this.openWSConnection({ handshakeTimeout: reconnectDelay - 100 });
1029       this.hasSocketRestarted = true;
1030     } else if (this.getAutoReconnectMaxRetries() !== -1) {
1031       logger.error(`${this.logPrefix()} Socket reconnect failure: max retries reached (${this.autoReconnectRetryCount}) or retry disabled (${this.getAutoReconnectMaxRetries()})`);
1032     }
1033   }
1034
1035   private initTransactionAttributesOnConnector(connectorId: number): void {
1036     this.getConnector(connectorId).authorized = false;
1037     this.getConnector(connectorId).transactionStarted = false;
1038     this.getConnector(connectorId).energyActiveImportRegisterValue = 0;
1039     this.getConnector(connectorId).transactionEnergyActiveImportRegisterValue = 0;
1040   }
1041 }
1042