src/charging-station/ChargingStation.ts

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