src/charging-station/ChargingStation.ts

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