src/charging-station/ChargingStation.ts

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