src/charging-station/ChargingStation.ts

   1 import { AuthorizationStatus, StartTransactionRequest, StartTransactionResponse, StopTransactionReason, StopTransactionRequest, StopTransactionResponse } from '../types/ocpp/1.6/Transaction';
   2 import { BootNotificationResponse, ChangeConfigurationResponse, DefaultResponse, GetConfigurationResponse, HeartbeatResponse, RegistrationStatus, SetChargingProfileResponse, StatusNotificationResponse, UnlockConnectorResponse } from '../types/ocpp/1.6/RequestResponses';
   3 import { ChargingProfile, ChargingProfilePurposeType } from '../types/ocpp/1.6/ChargingProfile';
   4 import ChargingStationConfiguration, { ConfigurationKey } from '../types/ChargingStationConfiguration';
   5 import ChargingStationTemplate, { PowerOutType } from '../types/ChargingStationTemplate';
   6 import Connectors, { Connector } from '../types/Connectors';
   7 import { MeterValue, MeterValueLocation, MeterValueMeasurand, MeterValuePhase, MeterValueUnit, MeterValuesRequest, MeterValuesResponse, SampledValue } from '../types/ocpp/1.6/MeterValues';
   8 import { PerformanceObserver, performance } from 'perf_hooks';
   9 import Requests, { BootNotificationRequest, ChangeConfigurationRequest, GetConfigurationRequest, HeartbeatRequest, RemoteStartTransactionRequest, RemoteStopTransactionRequest, ResetRequest, SetChargingProfileRequest, StatusNotificationRequest, UnlockConnectorRequest } from '../types/ocpp/1.6/Requests';
  10 import WebSocket, { MessageEvent } from 'ws';
  11
  12 import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
  13 import { ChargePointErrorCode } from '../types/ocpp/1.6/ChargePointErrorCode';
  14 import { ChargePointStatus } from '../types/ocpp/1.6/ChargePointStatus';
  15 import ChargingStationInfo from '../types/ChargingStationInfo';
  16 import Configuration from '../utils/Configuration';
  17 import Constants from '../utils/Constants';
  18 import ElectricUtils from '../utils/ElectricUtils';
  19 import MeasurandValues from '../types/MeasurandValues';
  20 import OCPPError from './OcppError';
  21 import Statistics from '../utils/Statistics';
  22 import Utils from '../utils/Utils';
  23 import crypto from 'crypto';
  24 import fs from 'fs';
  25 import logger from '../utils/Logger';
  26
  27 export default class ChargingStation {
  28   private _index: number;
  29   private _stationTemplateFile: string;
  30   private _stationInfo: ChargingStationInfo;
  31   private _bootNotificationRequest: BootNotificationRequest;
  32   private _bootNotificationResponse: BootNotificationResponse;
  33   private _connectors: Connectors;
  34   private _configuration: ChargingStationConfiguration;
  35   private _connectorsConfigurationHash: string;
  36   private _supervisionUrl: string;
  37   private _wsConnectionUrl: string;
  38   private _wsConnection: WebSocket;
  39   private _hasStopped: boolean;
  40   private _hasSocketRestarted: boolean;
  41   private _connectionTimeout: number;
  42   private _autoReconnectRetryCount: number;
  43   private _autoReconnectMaxRetries: number;
  44   private _requests: Requests;
  45   private _messageQueue: string[];
  46   private _automaticTransactionGeneration: AutomaticTransactionGenerator;
  47   private _authorizedTags: string[];
  48   private _heartbeatInterval: number;
  49   private _heartbeatSetInterval: NodeJS.Timeout;
  50   private _webSocketPingSetInterval: NodeJS.Timeout;
  51   private _statistics: Statistics;
  52   private _performanceObserver: PerformanceObserver;
  53
  54   constructor(index: number, stationTemplateFile: string) {
  55     this._index = index;
  56     this._stationTemplateFile = stationTemplateFile;
  57     this._connectors = {} as Connectors;
  58     this._initialize();
  59
  60     this._hasStopped = false;
  61     this._hasSocketRestarted = false;
  62     this._autoReconnectRetryCount = 0;
  63
  64     this._requests = {} as Requests;
  65     this._messageQueue = [] as string[];
  66
  67     this._authorizedTags = this._loadAndGetAuthorizedTags();
  68   }
  69
  70   _getStationName(stationTemplate: ChargingStationTemplate): string {
  71     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + this._index.toString()).substr(('000000000' + this._index.toString()).length - 4);
  72   }
  73
  74   _buildStationInfo(): ChargingStationInfo {
  75     let stationTemplateFromFile: ChargingStationTemplate;
  76     try {
  77       // Load template file
  78       const fileDescriptor = fs.openSync(this._stationTemplateFile, 'r');
  79       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
  80       fs.closeSync(fileDescriptor);
  81     } catch (error) {
  82       logger.error('Template file ' + this._stationTemplateFile + ' loading error: %j', error);
  83       throw error;
  84     }
  85     const stationInfo: ChargingStationInfo = stationTemplateFromFile || {} as ChargingStationInfo;
  86     if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
  87       stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
  88       stationInfo.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
  89     } else {
  90       stationInfo.maxPower = stationTemplateFromFile.power as number;
  91     }
  92     stationInfo.name = this._getStationName(stationTemplateFromFile);
  93     stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
  94     return stationInfo;
  95   }
  96
  97   get stationInfo(): ChargingStationInfo {
  98     return this._stationInfo;
  99   }
 100
 101   _initialize(): void {
 102     this._stationInfo = this._buildStationInfo();
 103     this._bootNotificationRequest = {
 104       chargePointModel: this._stationInfo.chargePointModel,
 105       chargePointVendor: this._stationInfo.chargePointVendor,
 106       ...!Utils.isUndefined(this._stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this._stationInfo.chargeBoxSerialNumberPrefix },
 107       ...!Utils.isUndefined(this._stationInfo.firmwareVersion) && { firmwareVersion: this._stationInfo.firmwareVersion },
 108     };
 109     this._configuration = this._getTemplateChargingStationConfiguration();
 110     this._supervisionUrl = this._getSupervisionURL();
 111     this._wsConnectionUrl = this._supervisionUrl + '/' + this._stationInfo.name;
 112     this._connectionTimeout = this._getConnectionTimeout() * 1000; // Ms, zero for disabling
 113     this._autoReconnectMaxRetries = this._getAutoReconnectMaxRetries(); // -1 for unlimited
 114     // Build connectors if needed
 115     const maxConnectors = this._getMaxNumberOfConnectors();
 116     if (maxConnectors <= 0) {
 117       logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with ${maxConnectors} connectors`);
 118     }
 119     const templateMaxConnectors = this._getTemplateMaxNumberOfConnectors();
 120     if (templateMaxConnectors <= 0) {
 121       logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with no connector configuration`);
 122     }
 123     if (!this._stationInfo.Connectors[0]) {
 124       logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with no connector Id 0 configuration`);
 125     }
 126     // Sanity check
 127     if (maxConnectors > (this._stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this._stationInfo.randomConnectors) {
 128       logger.warn(`${this._logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this._stationTemplateFile}, forcing random connector configurations affectation`);
 129       this._stationInfo.randomConnectors = true;
 130     }
 131     const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this._stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
 132     // FIXME: Handle shrinking the number of connectors
 133     if (!this._connectors || (this._connectors && this._connectorsConfigurationHash !== connectorsConfigHash)) {
 134       this._connectorsConfigurationHash = connectorsConfigHash;
 135       // Add connector Id 0
 136       let lastConnector = '0';
 137       for (lastConnector in this._stationInfo.Connectors) {
 138         if (Utils.convertToInt(lastConnector) === 0 && this._getUseConnectorId0() && this._stationInfo.Connectors[lastConnector]) {
 139           this._connectors[lastConnector] = Utils.cloneObject(this._stationInfo.Connectors[lastConnector]) as Connector;
 140         }
 141       }
 142       // Generate all connectors
 143       if ((this._stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
 144         for (let index = 1; index <= maxConnectors; index++) {
 145           const randConnectorID = this._stationInfo.randomConnectors ? Utils.getRandomInt(Utils.convertToInt(lastConnector), 1) : index;
 146           this._connectors[index] = Utils.cloneObject(this._stationInfo.Connectors[randConnectorID]) as Connector;
 147         }
 148       }
 149     }
 150     // Avoid duplication of connectors related information
 151     delete this._stationInfo.Connectors;
 152     // Initialize transaction attributes on connectors
 153     for (const connector in this._connectors) {
 154       if (Utils.convertToInt(connector) > 0 && !this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 155         this._initTransactionOnConnector(Utils.convertToInt(connector));
 156       }
 157     }
 158     // OCPP parameters
 159     this._addConfigurationKey('NumberOfConnectors', this._getNumberOfConnectors().toString(), true);
 160     if (!this._getConfigurationKey('MeterValuesSampledData')) {
 161       this._addConfigurationKey('MeterValuesSampledData', MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
 162     }
 163     this._stationInfo.powerDivider = this._getPowerDivider();
 164     if (this.getEnableStatistics()) {
 165       this._statistics = Statistics.getInstance();
 166       this._statistics.objName = this._stationInfo.name;
 167       this._performanceObserver = new PerformanceObserver((list) => {
 168         const entry = list.getEntries()[0];
 169         this._statistics.logPerformance(entry, Constants.ENTITY_CHARGING_STATION);
 170         this._performanceObserver.disconnect();
 171       });
 172     }
 173   }
 174
 175   get connectors(): Connectors {
 176     return this._connectors;
 177   }
 178
 179   get statistics(): Statistics {
 180     return this._statistics;
 181   }
 182
 183   _logPrefix(): string {
 184     return Utils.logPrefix(` ${this._stationInfo.name}:`);
 185   }
 186
 187   _getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
 188     return this._stationInfo.Configuration ? this._stationInfo.Configuration : {} as ChargingStationConfiguration;
 189   }
 190
 191   _getAuthorizationFile(): string {
 192     return this._stationInfo.authorizationFile && this._stationInfo.authorizationFile;
 193   }
 194
 195   _getUseConnectorId0(): boolean {
 196     return !Utils.isUndefined(this._stationInfo.useConnectorId0) ? this._stationInfo.useConnectorId0 : true;
 197   }
 198
 199   _loadAndGetAuthorizedTags(): string[] {
 200     let authorizedTags: string[] = [];
 201     const authorizationFile = this._getAuthorizationFile();
 202     if (authorizationFile) {
 203       try {
 204         // Load authorization file
 205         const fileDescriptor = fs.openSync(authorizationFile, 'r');
 206         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
 207         fs.closeSync(fileDescriptor);
 208       } catch (error) {
 209         logger.error(this._logPrefix() + ' Authorization file ' + authorizationFile + ' loading error: %j', error);
 210         throw error;
 211       }
 212     } else {
 213       logger.info(this._logPrefix() + ' No authorization file given in template file ' + this._stationTemplateFile);
 214     }
 215     return authorizedTags;
 216   }
 217
 218   getRandomTagId(): string {
 219     const index = Math.floor(Math.random() * this._authorizedTags.length);
 220     return this._authorizedTags[index];
 221   }
 222
 223   hasAuthorizedTags(): boolean {
 224     return !Utils.isEmptyArray(this._authorizedTags);
 225   }
 226
 227   getEnableStatistics(): boolean {
 228     return !Utils.isUndefined(this._stationInfo.enableStatistics) ? this._stationInfo.enableStatistics : true;
 229   }
 230
 231   _getNumberOfPhases(): number {
 232     switch (this._getPowerOutType()) {
 233       case PowerOutType.AC:
 234         return !Utils.isUndefined(this._stationInfo.numberOfPhases) ? Utils.convertToInt(this._stationInfo.numberOfPhases) : 3;
 235       case PowerOutType.DC:
 236         return 0;
 237     }
 238   }
 239
 240   _getNumberOfRunningTransactions(): number {
 241     let trxCount = 0;
 242     for (const connector in this._connectors) {
 243       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 244         trxCount++;
 245       }
 246     }
 247     return trxCount;
 248   }
 249
 250   _getConnectionTimeout(): number {
 251     if (!Utils.isUndefined(this._stationInfo.connectionTimeout)) {
 252       return this._stationInfo.connectionTimeout;
 253     }
 254     if (!Utils.isUndefined(Configuration.getConnectionTimeout())) {
 255       return Configuration.getConnectionTimeout();
 256     }
 257     return 30;
 258   }
 259
 260   _getAutoReconnectMaxRetries(): number {
 261     if (!Utils.isUndefined(this._stationInfo.autoReconnectMaxRetries)) {
 262       return this._stationInfo.autoReconnectMaxRetries;
 263     }
 264     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
 265       return Configuration.getAutoReconnectMaxRetries();
 266     }
 267     return -1;
 268   }
 269
 270   _getPowerDivider(): number {
 271     let powerDivider = this._getNumberOfConnectors();
 272     if (this._stationInfo.powerSharedByConnectors) {
 273       powerDivider = this._getNumberOfRunningTransactions();
 274     }
 275     return powerDivider;
 276   }
 277
 278   getConnector(id: number): Connector {
 279     return this._connectors[id];
 280   }
 281
 282   _getTemplateMaxNumberOfConnectors(): number {
 283     return Object.keys(this._stationInfo.Connectors).length;
 284   }
 285
 286   _getMaxNumberOfConnectors(): number {
 287     let maxConnectors = 0;
 288     if (!Utils.isEmptyArray(this._stationInfo.numberOfConnectors)) {
 289       const numberOfConnectors = this._stationInfo.numberOfConnectors as number[];
 290       // Distribute evenly the number of connectors
 291       maxConnectors = numberOfConnectors[(this._index - 1) % numberOfConnectors.length];
 292     } else if (!Utils.isUndefined(this._stationInfo.numberOfConnectors)) {
 293       maxConnectors = this._stationInfo.numberOfConnectors as number;
 294     } else {
 295       maxConnectors = this._stationInfo.Connectors[0] ? this._getTemplateMaxNumberOfConnectors() - 1 : this._getTemplateMaxNumberOfConnectors();
 296     }
 297     return maxConnectors;
 298   }
 299
 300   _getNumberOfConnectors(): number {
 301     return this._connectors[0] ? Object.keys(this._connectors).length - 1 : Object.keys(this._connectors).length;
 302   }
 303
 304   _getVoltageOut(): number {
 305     const errMsg = `${this._logPrefix()} Unknown ${this._getPowerOutType()} powerOutType in template file ${this._stationTemplateFile}, cannot define default voltage out`;
 306     let defaultVoltageOut: number;
 307     switch (this._getPowerOutType()) {
 308       case PowerOutType.AC:
 309         defaultVoltageOut = 230;
 310         break;
 311       case PowerOutType.DC:
 312         defaultVoltageOut = 400;
 313         break;
 314       default:
 315         logger.error(errMsg);
 316         throw Error(errMsg);
 317     }
 318     return !Utils.isUndefined(this._stationInfo.voltageOut) ? Utils.convertToInt(this._stationInfo.voltageOut) : defaultVoltageOut;
 319   }
 320
 321   _getTransactionIdTag(transactionId: number): string {
 322     for (const connector in this._connectors) {
 323       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 324         return this.getConnector(Utils.convertToInt(connector)).idTag;
 325       }
 326     }
 327   }
 328
 329   _getTransactionMeterStop(transactionId: number): number {
 330     for (const connector in this._connectors) {
 331       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 332         return this.getConnector(Utils.convertToInt(connector)).lastEnergyActiveImportRegisterValue;
 333       }
 334     }
 335   }
 336
 337   _getPowerOutType(): PowerOutType {
 338     return !Utils.isUndefined(this._stationInfo.powerOutType) ? this._stationInfo.powerOutType : PowerOutType.AC;
 339   }
 340
 341   _getSupervisionURL(): string {
 342     const supervisionUrls = Utils.cloneObject(this._stationInfo.supervisionURL ? this._stationInfo.supervisionURL : Configuration.getSupervisionURLs()) as string | string[];
 343     let indexUrl = 0;
 344     if (!Utils.isEmptyArray(supervisionUrls)) {
 345       if (Configuration.getDistributeStationsToTenantsEqually()) {
 346         indexUrl = this._index % supervisionUrls.length;
 347       } else {
 348         // Get a random url
 349         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 350       }
 351       return supervisionUrls[indexUrl];
 352     }
 353     return supervisionUrls as string;
 354   }
 355
 356   _getReconnectExponentialDelay(): boolean {
 357     return !Utils.isUndefined(this._stationInfo.reconnectExponentialDelay) ? this._stationInfo.reconnectExponentialDelay : false;
 358   }
 359
 360   _getAuthorizeRemoteTxRequests(): boolean {
 361     const authorizeRemoteTxRequests = this._getConfigurationKey('AuthorizeRemoteTxRequests');
 362     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 363   }
 364
 365   _getLocalAuthListEnabled(): boolean {
 366     const localAuthListEnabled = this._getConfigurationKey('LocalAuthListEnabled');
 367     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 368   }
 369
 370   async _startMessageSequence(): Promise<void> {
 371     // Start WebSocket ping
 372     this._startWebSocketPing();
 373     // Start heartbeat
 374     this._startHeartbeat();
 375     // Initialize connectors status
 376     for (const connector in this._connectors) {
 377       if (Utils.convertToInt(connector) === 0) {
 378         continue;
 379       } else if (!this._hasStopped && !this.getConnector(Utils.convertToInt(connector)).status && this.getConnector(Utils.convertToInt(connector)).bootStatus) {
 380         // Send status in template at startup
 381         await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 382       } else if (this._hasStopped && this.getConnector(Utils.convertToInt(connector)).bootStatus) {
 383         // Send status in template after reset
 384         await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 385       } else if (!this._hasStopped && this.getConnector(Utils.convertToInt(connector)).status) {
 386         // Send previous status at template reload
 387         await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).status);
 388       } else {
 389         // Send default status
 390         await this.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.AVAILABLE);
 391       }
 392     }
 393     // Start the ATG
 394     if (this._stationInfo.AutomaticTransactionGenerator.enable) {
 395       if (!this._automaticTransactionGeneration) {
 396         this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 397       }
 398       if (this._automaticTransactionGeneration.timeToStop) {
 399         this._automaticTransactionGeneration.start();
 400       }
 401     }
 402     if (this.getEnableStatistics()) {
 403       this._statistics.start();
 404     }
 405   }
 406
 407   async _stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 408     // Stop WebSocket ping
 409     this._stopWebSocketPing();
 410     // Stop heartbeat
 411     this._stopHeartbeat();
 412     // Stop the ATG
 413     if (this._stationInfo.AutomaticTransactionGenerator.enable &&
 414       this._automaticTransactionGeneration &&
 415       !this._automaticTransactionGeneration.timeToStop) {
 416       await this._automaticTransactionGeneration.stop(reason);
 417     } else {
 418       for (const connector in this._connectors) {
 419         if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 420           await this.sendStopTransaction(this.getConnector(Utils.convertToInt(connector)).transactionId, reason);
 421         }
 422       }
 423     }
 424   }
 425
 426   _startWebSocketPing(): void {
 427     const webSocketPingInterval: number = this._getConfigurationKey('WebSocketPingInterval') ? Utils.convertToInt(this._getConfigurationKey('WebSocketPingInterval').value) : 0;
 428     if (webSocketPingInterval > 0 && !this._webSocketPingSetInterval) {
 429       this._webSocketPingSetInterval = setInterval(() => {
 430         if (this._wsConnection?.readyState === WebSocket.OPEN) {
 431           this._wsConnection.ping((): void => { });
 432         }
 433       }, webSocketPingInterval * 1000);
 434       logger.info(this._logPrefix() + ' WebSocket ping started every ' + Utils.secondsToHHMMSS(webSocketPingInterval));
 435     } else if (this._webSocketPingSetInterval) {
 436       logger.info(this._logPrefix() + ' WebSocket ping every ' + Utils.secondsToHHMMSS(webSocketPingInterval) + ' already started');
 437     } else {
 438       logger.error(`${this._logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.secondsToHHMMSS(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
 439     }
 440   }
 441
 442   _stopWebSocketPing(): void {
 443     if (this._webSocketPingSetInterval) {
 444       clearInterval(this._webSocketPingSetInterval);
 445       this._webSocketPingSetInterval = null;
 446     }
 447   }
 448
 449   _restartWebSocketPing(): void {
 450     // Stop WebSocket ping
 451     this._stopWebSocketPing();
 452     // Start WebSocket ping
 453     this._startWebSocketPing();
 454   }
 455
 456   _startHeartbeat(): void {
 457     if (this._heartbeatInterval && this._heartbeatInterval > 0 && !this._heartbeatSetInterval) {
 458       this._heartbeatSetInterval = setInterval(async () => {
 459         await this.sendHeartbeat();
 460       }, this._heartbeatInterval);
 461       logger.info(this._logPrefix() + ' Heartbeat started every ' + Utils.milliSecondsToHHMMSS(this._heartbeatInterval));
 462     } else if (this._heartbeatSetInterval) {
 463       logger.info(this._logPrefix() + ' Heartbeat every ' + Utils.milliSecondsToHHMMSS(this._heartbeatInterval) + ' already started');
 464     } else {
 465       logger.error(`${this._logPrefix()} Heartbeat interval set to ${this._heartbeatInterval ? Utils.milliSecondsToHHMMSS(this._heartbeatInterval) : this._heartbeatInterval}, not starting the heartbeat`);
 466     }
 467   }
 468
 469   _stopHeartbeat(): void {
 470     if (this._heartbeatSetInterval) {
 471       clearInterval(this._heartbeatSetInterval);
 472       this._heartbeatSetInterval = null;
 473     }
 474   }
 475
 476   _restartHeartbeat(): void {
 477     // Stop heartbeat
 478     this._stopHeartbeat();
 479     // Start heartbeat
 480     this._startHeartbeat();
 481   }
 482
 483   _startAuthorizationFileMonitoring(): void {
 484     // eslint-disable-next-line @typescript-eslint/no-unused-vars
 485     fs.watchFile(this._getAuthorizationFile(), (current, previous) => {
 486       try {
 487         logger.debug(this._logPrefix() + ' Authorization file ' + this._getAuthorizationFile() + ' have changed, reload');
 488         // Initialize _authorizedTags
 489         this._authorizedTags = this._loadAndGetAuthorizedTags();
 490       } catch (error) {
 491         logger.error(this._logPrefix() + ' Authorization file monitoring error: %j', error);
 492       }
 493     });
 494   }
 495
 496   _startStationTemplateFileMonitoring(): void {
 497     // eslint-disable-next-line @typescript-eslint/no-unused-vars
 498     fs.watchFile(this._stationTemplateFile, (current, previous) => {
 499       try {
 500         logger.debug(this._logPrefix() + ' Template file ' + this._stationTemplateFile + ' have changed, reload');
 501         // Initialize
 502         this._initialize();
 503         if (!this._stationInfo.AutomaticTransactionGenerator.enable &&
 504           this._automaticTransactionGeneration) {
 505           this._automaticTransactionGeneration.stop().catch(() => { });
 506         }
 507         // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
 508       } catch (error) {
 509         logger.error(this._logPrefix() + ' Charging station template file monitoring error: %j', error);
 510       }
 511     });
 512   }
 513
 514   _startMeterValues(connectorId: number, interval: number): void {
 515     if (!this.getConnector(connectorId).transactionStarted) {
 516       logger.error(`${this._logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
 517       return;
 518     } else if (this.getConnector(connectorId).transactionStarted && !this.getConnector(connectorId).transactionId) {
 519       logger.error(`${this._logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
 520       return;
 521     }
 522     if (interval > 0) {
 523       this.getConnector(connectorId).transactionSetInterval = setInterval(async () => {
 524         if (this.getEnableStatistics()) {
 525           const sendMeterValues = performance.timerify(this.sendMeterValues);
 526           this._performanceObserver.observe({
 527             entryTypes: ['function'],
 528           });
 529           await sendMeterValues(connectorId, interval, this);
 530         } else {
 531           await this.sendMeterValues(connectorId, interval, this);
 532         }
 533       }, interval);
 534     } else {
 535       logger.error(`${this._logPrefix()} Charging station MeterValueSampleInterval configuration set to ${Utils.milliSecondsToHHMMSS(interval)}, not sending MeterValues`);
 536     }
 537   }
 538
 539   _openWSConnection(options?: WebSocket.ClientOptions): void {
 540     if (Utils.isUndefined(options)) {
 541       options = {} as WebSocket.ClientOptions;
 542     }
 543     if (Utils.isUndefined(options.handshakeTimeout)) {
 544       options.handshakeTimeout = this._connectionTimeout;
 545     }
 546     this._wsConnection = new WebSocket(this._wsConnectionUrl, 'ocpp' + Constants.OCPP_VERSION_16, options);
 547     logger.info(this._logPrefix() + ' Will communicate through URL ' + this._supervisionUrl);
 548   }
 549
 550   start(): void {
 551     this._openWSConnection();
 552     // Monitor authorization file
 553     this._startAuthorizationFileMonitoring();
 554     // Monitor station template file
 555     this._startStationTemplateFileMonitoring();
 556     // Handle Socket incoming messages
 557     this._wsConnection.on('message', this.onMessage.bind(this));
 558     // Handle Socket error
 559     this._wsConnection.on('error', this.onError.bind(this));
 560     // Handle Socket close
 561     this._wsConnection.on('close', this.onClose.bind(this));
 562     // Handle Socket opening connection
 563     this._wsConnection.on('open', this.onOpen.bind(this));
 564     // Handle Socket ping
 565     this._wsConnection.on('ping', this.onPing.bind(this));
 566     // Handle Socket pong
 567     this._wsConnection.on('pong', this.onPong.bind(this));
 568   }
 569
 570   async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 571     // Stop message sequence
 572     await this._stopMessageSequence(reason);
 573     for (const connector in this._connectors) {
 574       if (Utils.convertToInt(connector) > 0) {
 575         await this.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.UNAVAILABLE);
 576       }
 577     }
 578     if (this._wsConnection?.readyState === WebSocket.OPEN) {
 579       this._wsConnection.close();
 580     }
 581     this._bootNotificationResponse = null;
 582     this._hasStopped = true;
 583   }
 584
 585   async _reconnect(error): Promise<void> {
 586     logger.error(this._logPrefix() + ' Socket: abnormally closed: %j', error);
 587     // Stop heartbeat
 588     this._stopHeartbeat();
 589     // Stop the ATG if needed
 590     if (this._stationInfo.AutomaticTransactionGenerator.enable &&
 591       this._stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
 592       this._automaticTransactionGeneration &&
 593       !this._automaticTransactionGeneration.timeToStop) {
 594       this._automaticTransactionGeneration.stop().catch(() => { });
 595     }
 596     if (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1) {
 597       this._autoReconnectRetryCount++;
 598       const reconnectDelay = (this._getReconnectExponentialDelay() ? Utils.exponentialDelay(this._autoReconnectRetryCount) : this._connectionTimeout);
 599       logger.error(`${this._logPrefix()} Socket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectDelay - 100}ms`);
 600       await Utils.sleep(reconnectDelay);
 601       logger.error(this._logPrefix() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount.toString());
 602       this._openWSConnection({ handshakeTimeout: reconnectDelay - 100 });
 603     } else if (this._autoReconnectMaxRetries !== -1) {
 604       logger.error(`${this._logPrefix()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectMaxRetries})`);
 605     }
 606   }
 607
 608   async onOpen(): Promise<void> {
 609     logger.info(`${this._logPrefix()} Is connected to server through ${this._wsConnectionUrl}`);
 610     if (!this._hasSocketRestarted || this._hasStopped) {
 611       // Send BootNotification
 612       this._bootNotificationResponse = await this.sendBootNotification();
 613     }
 614     if (this._bootNotificationResponse.status === RegistrationStatus.ACCEPTED) {
 615       await this._startMessageSequence();
 616     } else {
 617       do {
 618         await Utils.sleep(this._bootNotificationResponse.interval * 1000);
 619         // Resend BootNotification
 620         this._bootNotificationResponse = await this.sendBootNotification();
 621       } while (this._bootNotificationResponse.status !== RegistrationStatus.ACCEPTED);
 622     }
 623     if (this._hasSocketRestarted && this._bootNotificationResponse.status === RegistrationStatus.ACCEPTED) {
 624       if (!Utils.isEmptyArray(this._messageQueue)) {
 625         this._messageQueue.forEach((message, index) => {
 626           if (this._wsConnection?.readyState === WebSocket.OPEN) {
 627             this._messageQueue.splice(index, 1);
 628             this._wsConnection.send(message);
 629           }
 630         });
 631       }
 632     }
 633     this._autoReconnectRetryCount = 0;
 634     this._hasSocketRestarted = false;
 635   }
 636
 637   async onError(errorEvent): Promise<void> {
 638     switch (errorEvent.code) {
 639       case 'ECONNREFUSED':
 640         this._hasSocketRestarted = true;
 641         await this._reconnect(errorEvent);
 642         break;
 643       default:
 644         logger.error(this._logPrefix() + ' Socket error: %j', errorEvent);
 645         break;
 646     }
 647   }
 648
 649   async onClose(closeEvent): Promise<void> {
 650     switch (closeEvent) {
 651       case 1000: // Normal close
 652       case 1005:
 653         logger.info(this._logPrefix() + ' Socket normally closed: %j', closeEvent);
 654         this._autoReconnectRetryCount = 0;
 655         break;
 656       default: // Abnormal close
 657         this._hasSocketRestarted = true;
 658         await this._reconnect(closeEvent);
 659         break;
 660     }
 661   }
 662
 663   onPing(): void {
 664     logger.debug(this._logPrefix() + ' Has received a WS ping (rfc6455) from the server');
 665   }
 666
 667   onPong(): void {
 668     logger.debug(this._logPrefix() + ' Has received a WS pong (rfc6455) from the server');
 669   }
 670
 671   async onMessage(messageEvent: MessageEvent): Promise<void> {
 672     let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
 673     try {
 674       // Parse the message
 675       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(messageEvent.toString());
 676
 677       // Check the Type of message
 678       switch (messageType) {
 679         // Incoming Message
 680         case Constants.OCPP_JSON_CALL_MESSAGE:
 681           if (this.getEnableStatistics()) {
 682             this._statistics.addMessage(commandName, messageType);
 683           }
 684           // Process the call
 685           await this.handleRequest(messageId, commandName, commandPayload);
 686           break;
 687         // Outcome Message
 688         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 689           // Respond
 690           // eslint-disable-next-line no-case-declarations
 691           let responseCallback; let requestPayload;
 692           if (Utils.isIterable(this._requests[messageId])) {
 693             [responseCallback, , requestPayload] = this._requests[messageId];
 694           } else {
 695             throw new Error(`Response request for message id ${messageId} is not iterable`);
 696           }
 697           if (!responseCallback) {
 698             // Error
 699             throw new Error(`Response request for unknown message id ${messageId}`);
 700           }
 701           delete this._requests[messageId];
 702           responseCallback(commandName, requestPayload);
 703           break;
 704         // Error Message
 705         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 706           if (!this._requests[messageId]) {
 707             // Error
 708             throw new Error(`Error request for unknown message id ${messageId}`);
 709           }
 710           // eslint-disable-next-line no-case-declarations
 711           let rejectCallback;
 712           if (Utils.isIterable(this._requests[messageId])) {
 713             [, rejectCallback] = this._requests[messageId];
 714           } else {
 715             throw new Error(`Error request for message id ${messageId} is not iterable`);
 716           }
 717           delete this._requests[messageId];
 718           rejectCallback(new OCPPError(commandName, commandPayload, errorDetails));
 719           break;
 720         // Error
 721         default:
 722           // eslint-disable-next-line no-case-declarations
 723           const errMsg = `${this._logPrefix()} Wrong message type ${messageType}`;
 724           logger.error(errMsg);
 725           throw new Error(errMsg);
 726       }
 727     } catch (error) {
 728       // Log
 729       logger.error('%s Incoming message %j processing error %s on request content type %s', this._logPrefix(), messageEvent, error, this._requests[messageId]);
 730       // Send error
 731       messageType !== Constants.OCPP_JSON_CALL_ERROR_MESSAGE && await this.sendError(messageId, error, commandName);
 732     }
 733   }
 734
 735   async sendHeartbeat(): Promise<void> {
 736     try {
 737       const payload: HeartbeatRequest = {};
 738       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
 739     } catch (error) {
 740       logger.error(this._logPrefix() + ' Send Heartbeat error: %j', error);
 741       throw error;
 742     }
 743   }
 744
 745   async sendBootNotification(): Promise<BootNotificationResponse> {
 746     try {
 747       return await this.sendMessage(Utils.generateUUID(), this._bootNotificationRequest, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification') as BootNotificationResponse;
 748     } catch (error) {
 749       logger.error(this._logPrefix() + ' Send BootNotification error: %j', error);
 750       throw error;
 751     }
 752   }
 753
 754   async sendStatusNotification(connectorId: number, status: ChargePointStatus, errorCode: ChargePointErrorCode = ChargePointErrorCode.NO_ERROR): Promise<void> {
 755     this.getConnector(connectorId).status = status;
 756     try {
 757       const payload: StatusNotificationRequest = {
 758         connectorId,
 759         errorCode,
 760         status,
 761       };
 762       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
 763     } catch (error) {
 764       logger.error(this._logPrefix() + ' Send StatusNotification error: %j', error);
 765       throw error;
 766     }
 767   }
 768
 769   async sendStartTransaction(connectorId: number, idTag?: string): Promise<StartTransactionResponse> {
 770     try {
 771       const payload: StartTransactionRequest = {
 772         connectorId,
 773         ...!Utils.isUndefined(idTag) ? { idTag } : { idTag: Constants.TRANSACTION_DEFAULT_IDTAG },
 774         meterStart: 0,
 775         timestamp: new Date().toISOString(),
 776       };
 777       return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction') as StartTransactionResponse;
 778     } catch (error) {
 779       logger.error(this._logPrefix() + ' Send StartTransaction error: %j', error);
 780       throw error;
 781     }
 782   }
 783
 784   async sendStopTransaction(transactionId: number, reason: StopTransactionReason = StopTransactionReason.NONE): Promise<StopTransactionResponse> {
 785     const idTag = this._getTransactionIdTag(transactionId);
 786     try {
 787       const payload: StopTransactionRequest = {
 788         transactionId,
 789         ...!Utils.isUndefined(idTag) && { idTag: idTag },
 790         meterStop: this._getTransactionMeterStop(transactionId),
 791         timestamp: new Date().toISOString(),
 792         ...reason && { reason },
 793       };
 794       return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction') as StartTransactionResponse;
 795     } catch (error) {
 796       logger.error(this._logPrefix() + ' Send StopTransaction error: %j', error);
 797       throw error;
 798     }
 799   }
 800
 801   // eslint-disable-next-line consistent-this
 802   async sendMeterValues(connectorId: number, interval: number, self: ChargingStation, debug = false): Promise<void> {
 803     try {
 804       const meterValue: MeterValue = {
 805         timestamp: new Date().toISOString(),
 806         sampledValue: [],
 807       };
 808       const meterValuesTemplate: SampledValue[] = self.getConnector(connectorId).MeterValues;
 809       for (let index = 0; index < meterValuesTemplate.length; index++) {
 810         const connector = self.getConnector(connectorId);
 811         // SoC measurand
 812         if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.STATE_OF_CHARGE && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.STATE_OF_CHARGE)) {
 813           meterValue.sampledValue.push({
 814             ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.PERCENT },
 815             ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 816             measurand: meterValuesTemplate[index].measurand,
 817             ...!Utils.isUndefined(meterValuesTemplate[index].location) ? { location: meterValuesTemplate[index].location } : { location: MeterValueLocation.EV },
 818             ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: Utils.getRandomInt(100).toString() },
 819           });
 820           const sampledValuesIndex = meterValue.sampledValue.length - 1;
 821           if (Utils.convertToInt(meterValue.sampledValue[sampledValuesIndex].value) > 100 || debug) {
 822             logger.error(`${self._logPrefix()} MeterValues measurand ${meterValue.sampledValue[sampledValuesIndex].measurand ? meterValue.sampledValue[sampledValuesIndex].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${meterValue.sampledValue[sampledValuesIndex].value}/100`);
 823           }
 824         // Voltage measurand
 825         } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.VOLTAGE && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.VOLTAGE)) {
 826           const voltageMeasurandValue = Utils.getRandomFloatRounded(self._getVoltageOut() + self._getVoltageOut() * 0.1, self._getVoltageOut() - self._getVoltageOut() * 0.1);
 827           meterValue.sampledValue.push({
 828             ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.VOLT },
 829             ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 830             measurand: meterValuesTemplate[index].measurand,
 831             ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 832             ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: voltageMeasurandValue.toString() },
 833           });
 834           for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
 835             let phaseValue: string;
 836             if (self._getVoltageOut() >= 0 && self._getVoltageOut() <= 250) {
 837               phaseValue = `L${phase}-N`;
 838             } else if (self._getVoltageOut() > 250) {
 839               phaseValue = `L${phase}-L${(phase + 1) % self._getNumberOfPhases() !== 0 ? (phase + 1) % self._getNumberOfPhases() : self._getNumberOfPhases()}`;
 840             }
 841             meterValue.sampledValue.push({
 842               ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.VOLT },
 843               ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 844               measurand: meterValuesTemplate[index].measurand,
 845               ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 846               ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: voltageMeasurandValue.toString() },
 847               phase: phaseValue as MeterValuePhase,
 848             });
 849           }
 850         // Power.Active.Import measurand
 851         } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.POWER_ACTIVE_IMPORT && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.POWER_ACTIVE_IMPORT)) {
 852           // FIXME: factor out powerDivider checks
 853           if (Utils.isUndefined(self._stationInfo.powerDivider)) {
 854             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
 855             logger.error(errMsg);
 856             throw Error(errMsg);
 857           } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
 858             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
 859             logger.error(errMsg);
 860             throw Error(errMsg);
 861           }
 862           const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: Unknown ${self._getPowerOutType()} powerOutType in template file ${self._stationTemplateFile}, cannot calculate ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER} measurand value`;
 863           const powerMeasurandValues = {} as MeasurandValues;
 864           const maxPower = Math.round(self._stationInfo.maxPower / self._stationInfo.powerDivider);
 865           const maxPowerPerPhase = Math.round((self._stationInfo.maxPower / self._stationInfo.powerDivider) / self._getNumberOfPhases());
 866           switch (self._getPowerOutType()) {
 867             case PowerOutType.AC:
 868               if (Utils.isUndefined(meterValuesTemplate[index].value)) {
 869                 powerMeasurandValues.L1 = Utils.getRandomFloatRounded(maxPowerPerPhase);
 870                 powerMeasurandValues.L2 = 0;
 871                 powerMeasurandValues.L3 = 0;
 872                 if (self._getNumberOfPhases() === 3) {
 873                   powerMeasurandValues.L2 = Utils.getRandomFloatRounded(maxPowerPerPhase);
 874                   powerMeasurandValues.L3 = Utils.getRandomFloatRounded(maxPowerPerPhase);
 875                 }
 876                 powerMeasurandValues.allPhases = Utils.roundTo(powerMeasurandValues.L1 + powerMeasurandValues.L2 + powerMeasurandValues.L3, 2);
 877               }
 878               break;
 879             case PowerOutType.DC:
 880               if (Utils.isUndefined(meterValuesTemplate[index].value)) {
 881                 powerMeasurandValues.allPhases = Utils.getRandomFloatRounded(maxPower);
 882               }
 883               break;
 884             default:
 885               logger.error(errMsg);
 886               throw Error(errMsg);
 887           }
 888           meterValue.sampledValue.push({
 889             ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT },
 890             ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 891             measurand: meterValuesTemplate[index].measurand,
 892             ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 893             ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: powerMeasurandValues.allPhases.toString() },
 894           });
 895           const sampledValuesIndex = meterValue.sampledValue.length - 1;
 896           if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxPower || debug) {
 897             logger.error(`${self._logPrefix()} MeterValues measurand ${meterValue.sampledValue[sampledValuesIndex].measurand ? meterValue.sampledValue[sampledValuesIndex].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${meterValue.sampledValue[sampledValuesIndex].value}/${maxPower}`);
 898           }
 899           for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
 900             const phaseValue = `L${phase}-N`;
 901             meterValue.sampledValue.push({
 902               ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT },
 903               ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 904               ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
 905               ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 906               ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: powerMeasurandValues[`L${phase}`] as string },
 907               phase: phaseValue as MeterValuePhase,
 908             });
 909           }
 910         // Current.Import measurand
 911         } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.CURRENT_IMPORT && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.CURRENT_IMPORT)) {
 912           // FIXME: factor out powerDivider checks
 913           if (Utils.isUndefined(self._stationInfo.powerDivider)) {
 914             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
 915             logger.error(errMsg);
 916             throw Error(errMsg);
 917           } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
 918             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
 919             logger.error(errMsg);
 920             throw Error(errMsg);
 921           }
 922           const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: Unknown ${self._getPowerOutType()} powerOutType in template file ${self._stationTemplateFile}, cannot calculate ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER} measurand value`;
 923           const currentMeasurandValues: MeasurandValues = {} as MeasurandValues;
 924           let maxAmperage: number;
 925           switch (self._getPowerOutType()) {
 926             case PowerOutType.AC:
 927               maxAmperage = ElectricUtils.ampPerPhaseFromPower(self._getNumberOfPhases(), self._stationInfo.maxPower / self._stationInfo.powerDivider, self._getVoltageOut());
 928               if (Utils.isUndefined(meterValuesTemplate[index].value)) {
 929                 currentMeasurandValues.L1 = Utils.getRandomFloatRounded(maxAmperage);
 930                 currentMeasurandValues.L2 = 0;
 931                 currentMeasurandValues.L3 = 0;
 932                 if (self._getNumberOfPhases() === 3) {
 933                   currentMeasurandValues.L2 = Utils.getRandomFloatRounded(maxAmperage);
 934                   currentMeasurandValues.L3 = Utils.getRandomFloatRounded(maxAmperage);
 935                 }
 936                 currentMeasurandValues.allPhases = Utils.roundTo((currentMeasurandValues.L1 + currentMeasurandValues.L2 + currentMeasurandValues.L3) / self._getNumberOfPhases(), 2);
 937               }
 938               break;
 939             case PowerOutType.DC:
 940               maxAmperage = ElectricUtils.ampTotalFromPower(self._stationInfo.maxPower / self._stationInfo.powerDivider, self._getVoltageOut());
 941               if (Utils.isUndefined(meterValuesTemplate[index].value)) {
 942                 currentMeasurandValues.allPhases = Utils.getRandomFloatRounded(maxAmperage);
 943               }
 944               break;
 945             default:
 946               logger.error(errMsg);
 947               throw Error(errMsg);
 948           }
 949           meterValue.sampledValue.push({
 950             ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.AMP },
 951             ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 952             measurand: meterValuesTemplate[index].measurand,
 953             ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 954             ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: currentMeasurandValues.allPhases.toString() },
 955           });
 956           const sampledValuesIndex = meterValue.sampledValue.length - 1;
 957           if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxAmperage || debug) {
 958             logger.error(`${self._logPrefix()} MeterValues measurand ${meterValue.sampledValue[sampledValuesIndex].measurand ? meterValue.sampledValue[sampledValuesIndex].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${meterValue.sampledValue[sampledValuesIndex].value}/${maxAmperage}`);
 959           }
 960           for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
 961             const phaseValue = `L${phase}`;
 962             meterValue.sampledValue.push({
 963               ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.AMP },
 964               ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 965               ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
 966               ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 967               ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: currentMeasurandValues[phaseValue] as string },
 968               phase: phaseValue as MeterValuePhase,
 969             });
 970           }
 971         // Energy.Active.Import.Register measurand (default)
 972         } else if (!meterValuesTemplate[index].measurand || meterValuesTemplate[index].measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
 973           // FIXME: factor out powerDivider checks
 974           if (Utils.isUndefined(self._stationInfo.powerDivider)) {
 975             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
 976             logger.error(errMsg);
 977             throw Error(errMsg);
 978           } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
 979             const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
 980             logger.error(errMsg);
 981             throw Error(errMsg);
 982           }
 983           if (Utils.isUndefined(meterValuesTemplate[index].value)) {
 984             const measurandValue = Utils.getRandomInt(self._stationInfo.maxPower / (self._stationInfo.powerDivider * 3600000) * interval);
 985             // Persist previous value in connector
 986             if (connector && !Utils.isNullOrUndefined(connector.lastEnergyActiveImportRegisterValue) && connector.lastEnergyActiveImportRegisterValue >= 0) {
 987               connector.lastEnergyActiveImportRegisterValue += measurandValue;
 988             } else {
 989               connector.lastEnergyActiveImportRegisterValue = 0;
 990             }
 991           }
 992           meterValue.sampledValue.push({
 993             ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT_HOUR },
 994             ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
 995             ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
 996             ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
 997             ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } :
 998               { value: connector.lastEnergyActiveImportRegisterValue.toString() },
 999           });
1000           const sampledValuesIndex = meterValue.sampledValue.length - 1;
1001           const maxConsumption = Math.round(self._stationInfo.maxPower * 3600 / (self._stationInfo.powerDivider * interval));
1002           if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxConsumption || debug) {
1003             logger.error(`${self._logPrefix()} MeterValues measurand ${meterValue.sampledValue[sampledValuesIndex].measurand ? meterValue.sampledValue[sampledValuesIndex].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${meterValue.sampledValue[sampledValuesIndex].value}/${maxConsumption}`);
1004           }
1005         // Unsupported measurand
1006         } else {
1007           logger.info(`${self._logPrefix()} Unsupported MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER} on connectorId ${connectorId}`);
1008         }
1009       }
1010       const payload: MeterValuesRequest = {
1011         connectorId,
1012         transactionId: self.getConnector(connectorId).transactionId,
1013         meterValue: meterValue,
1014       };
1015       await self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
1016     } catch (error) {
1017       logger.error(self._logPrefix() + ' Send MeterValues error: %j', error);
1018       throw error;
1019     }
1020   }
1021
1022   async sendError(messageId: string, err: Error | OCPPError, commandName: string): Promise<unknown> {
1023     // Check exception type: only OCPP error are accepted
1024     const error = err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message, err.stack && err.stack);
1025     // Send error
1026     return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE, commandName);
1027   }
1028
1029   async sendMessage(messageId: string, commandParams, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName: string): Promise<any> {
1030     // eslint-disable-next-line @typescript-eslint/no-this-alias
1031     const self = this;
1032     // Send a message through wsConnection
1033     return new Promise((resolve: (value?: any | PromiseLike<any>) => void, reject: (reason?: any) => void) => {
1034       let messageToSend;
1035       // Type of message
1036       switch (messageType) {
1037         // Request
1038         case Constants.OCPP_JSON_CALL_MESSAGE:
1039           // Build request
1040           this._requests[messageId] = [responseCallback, rejectCallback, commandParams];
1041           messageToSend = JSON.stringify([messageType, messageId, commandName, commandParams]);
1042           break;
1043         // Response
1044         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
1045           // Build response
1046           messageToSend = JSON.stringify([messageType, messageId, commandParams]);
1047           break;
1048         // Error Message
1049         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
1050           // Build Error Message
1051           messageToSend = JSON.stringify([messageType, messageId, commandParams.code ? commandParams.code : Constants.OCPP_ERROR_GENERIC_ERROR, commandParams.message ? commandParams.message : '', commandParams.details ? commandParams.details : {}]);
1052           break;
1053       }
1054       // Check if wsConnection is ready
1055       if (this._wsConnection?.readyState === WebSocket.OPEN) {
1056         if (this.getEnableStatistics()) {
1057           this._statistics.addMessage(commandName, messageType);
1058         }
1059         // Yes: Send Message
1060         this._wsConnection.send(messageToSend);
1061       } else {
1062         let dups = false;
1063         // Handle dups in buffer
1064         for (const message of this._messageQueue) {
1065           // Same message
1066           if (JSON.stringify(messageToSend) === JSON.stringify(message)) {
1067             dups = true;
1068             break;
1069           }
1070         }
1071         if (!dups) {
1072           // Buffer message
1073           this._messageQueue.push(messageToSend);
1074         }
1075         // Reject it
1076         return rejectCallback(new OCPPError(commandParams.code ? commandParams.code : Constants.OCPP_ERROR_GENERIC_ERROR, commandParams.message ? commandParams.message : `WebSocket closed for message id '${messageId}' with content '${messageToSend}', message buffered`, commandParams.details ? commandParams.details : {}));
1077       }
1078       // Response?
1079       if (messageType === Constants.OCPP_JSON_CALL_RESULT_MESSAGE) {
1080         // Yes: send Ok
1081         resolve();
1082       } else if (messageType === Constants.OCPP_JSON_CALL_ERROR_MESSAGE) {
1083         // Send timeout
1084         setTimeout(() => rejectCallback(new OCPPError(commandParams.code ? commandParams.code : Constants.OCPP_ERROR_GENERIC_ERROR, commandParams.message ? commandParams.message : `Timeout for message id '${messageId}' with content '${messageToSend}'`, commandParams.details ? commandParams.details : {})), Constants.OCPP_SOCKET_TIMEOUT);
1085       }
1086
1087       // Function that will receive the request's response
1088       async function responseCallback(payload, requestPayload): Promise<void> {
1089         if (self.getEnableStatistics()) {
1090           self._statistics.addMessage(commandName, messageType);
1091         }
1092         // Send the response
1093         await self.handleResponse(commandName, payload, requestPayload);
1094         resolve(payload);
1095       }
1096
1097       // Function that will receive the request's rejection
1098       function rejectCallback(error: OCPPError): void {
1099         if (self.getEnableStatistics()) {
1100           self._statistics.addMessage(commandName, messageType);
1101         }
1102         logger.debug(`${self._logPrefix()} Error: %j occurred when calling command %s with parameters: %j`, error, commandName, commandParams);
1103         // Build Exception
1104         // eslint-disable-next-line no-empty-function
1105         self._requests[messageId] = [() => { }, () => { }, {}]; // Properly format the request
1106         // Send error
1107         reject(error);
1108       }
1109     });
1110   }
1111
1112   async handleResponse(commandName: string, payload, requestPayload): Promise<void> {
1113     const responseCallbackFn = 'handleResponse' + commandName;
1114     if (typeof this[responseCallbackFn] === 'function') {
1115       await this[responseCallbackFn](payload, requestPayload);
1116     } else {
1117       logger.error(this._logPrefix() + ' Trying to call an undefined response callback function: ' + responseCallbackFn);
1118     }
1119   }
1120
1121   handleResponseBootNotification(payload: BootNotificationResponse, requestPayload: BootNotificationRequest): void {
1122     if (payload.status === RegistrationStatus.ACCEPTED) {
1123       this._heartbeatInterval = Utils.convertToInt(payload.interval) * 1000;
1124       this._heartbeatSetInterval ? this._restartHeartbeat() : this._startHeartbeat();
1125       this._addConfigurationKey('HeartBeatInterval', payload.interval.toString());
1126       this._addConfigurationKey('HeartbeatInterval', payload.interval.toString(), false, false);
1127       this._hasStopped && (this._hasStopped = false);
1128     } else if (payload.status === RegistrationStatus.PENDING) {
1129       logger.info(this._logPrefix() + ' Charging station in pending state on the central server');
1130     } else {
1131       logger.info(this._logPrefix() + ' Charging station rejected by the central server');
1132     }
1133   }
1134
1135   _initTransactionOnConnector(connectorId: number): void {
1136     this.getConnector(connectorId).transactionStarted = false;
1137     this.getConnector(connectorId).transactionId = null;
1138     this.getConnector(connectorId).idTag = null;
1139     this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = -1;
1140   }
1141
1142   _resetTransactionOnConnector(connectorId: number): void {
1143     this._initTransactionOnConnector(connectorId);
1144     if (this.getConnector(connectorId).transactionSetInterval) {
1145       clearInterval(this.getConnector(connectorId).transactionSetInterval);
1146     }
1147   }
1148
1149   async handleResponseStartTransaction(payload: StartTransactionResponse, requestPayload: StartTransactionRequest): Promise<void> {
1150     const connectorId = Utils.convertToInt(requestPayload.connectorId);
1151     if (this.getConnector(connectorId).transactionStarted) {
1152       logger.debug(this._logPrefix() + ' Trying to start a transaction on an already used connector ' + connectorId.toString() + ': %j', this.getConnector(connectorId));
1153       return;
1154     }
1155
1156     let transactionConnectorId: number;
1157     for (const connector in this._connectors) {
1158       if (Utils.convertToInt(connector) > 0 && Utils.convertToInt(connector) === connectorId) {
1159         transactionConnectorId = Utils.convertToInt(connector);
1160         break;
1161       }
1162     }
1163     if (!transactionConnectorId) {
1164       logger.error(this._logPrefix() + ' Trying to start a transaction on a non existing connector Id ' + connectorId.toString());
1165       return;
1166     }
1167     if (payload.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
1168       this.getConnector(connectorId).transactionStarted = true;
1169       this.getConnector(connectorId).transactionId = payload.transactionId;
1170       this.getConnector(connectorId).idTag = requestPayload.idTag;
1171       this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = 0;
1172       await this.sendStatusNotification(connectorId, ChargePointStatus.CHARGING);
1173       logger.info(this._logPrefix() + ' Transaction ' + payload.transactionId.toString() + ' STARTED on ' + this._stationInfo.name + '#' + connectorId.toString() + ' for idTag ' + requestPayload.idTag);
1174       if (this._stationInfo.powerSharedByConnectors) {
1175         this._stationInfo.powerDivider++;
1176       }
1177       const configuredMeterValueSampleInterval = this._getConfigurationKey('MeterValueSampleInterval');
1178       this._startMeterValues(connectorId,
1179         configuredMeterValueSampleInterval ? Utils.convertToInt(configuredMeterValueSampleInterval.value) * 1000 : 60000);
1180     } else {
1181       logger.error(this._logPrefix() + ' Starting transaction id ' + payload.transactionId.toString() + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
1182       this._resetTransactionOnConnector(connectorId);
1183       await this.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
1184     }
1185   }
1186
1187   async handleResponseStopTransaction(payload: StopTransactionResponse, requestPayload: StopTransactionRequest): Promise<void> {
1188     let transactionConnectorId: number;
1189     for (const connector in this._connectors) {
1190       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === Utils.convertToInt(requestPayload.transactionId)) {
1191         transactionConnectorId = Utils.convertToInt(connector);
1192         break;
1193       }
1194     }
1195     if (!transactionConnectorId) {
1196       logger.error(this._logPrefix() + ' Trying to stop a non existing transaction ' + requestPayload.transactionId.toString());
1197       return;
1198     }
1199     if (payload.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
1200       await this.sendStatusNotification(transactionConnectorId, ChargePointStatus.AVAILABLE);
1201       if (this._stationInfo.powerSharedByConnectors) {
1202         this._stationInfo.powerDivider--;
1203       }
1204       logger.info(this._logPrefix() + ' Transaction ' + requestPayload.transactionId.toString() + ' STOPPED on ' + this._stationInfo.name + '#' + transactionConnectorId.toString());
1205       this._resetTransactionOnConnector(transactionConnectorId);
1206     } else {
1207       logger.error(this._logPrefix() + ' Stopping transaction id ' + requestPayload.transactionId.toString() + ' REJECTED with status ' + payload.idTagInfo?.status);
1208     }
1209   }
1210
1211   handleResponseStatusNotification(payload: StatusNotificationRequest, requestPayload: StatusNotificationResponse): void {
1212     logger.debug(this._logPrefix() + ' Status notification response received: %j to StatusNotification request: %j', payload, requestPayload);
1213   }
1214
1215   handleResponseMeterValues(payload: MeterValuesRequest, requestPayload: MeterValuesResponse): void {
1216     logger.debug(this._logPrefix() + ' MeterValues response received: %j to MeterValues request: %j', payload, requestPayload);
1217   }
1218
1219   handleResponseHeartbeat(payload: HeartbeatResponse, requestPayload: HeartbeatRequest): void {
1220     logger.debug(this._logPrefix() + ' Heartbeat response received: %j to Heartbeat request: %j', payload, requestPayload);
1221   }
1222
1223   async handleRequest(messageId: string, commandName: string, commandPayload): Promise<void> {
1224     let response;
1225     // Call
1226     if (typeof this['handleRequest' + commandName] === 'function') {
1227       try {
1228         // Call the method to build the response
1229         response = await this['handleRequest' + commandName](commandPayload);
1230       } catch (error) {
1231         // Log
1232         logger.error(this._logPrefix() + ' Handle request error: %j', error);
1233         // Send back response to inform backend
1234         await this.sendError(messageId, error, commandName);
1235         throw error;
1236       }
1237     } else {
1238       // Throw exception
1239       await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, `${commandName} is not implemented`, {}), commandName);
1240       throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
1241     }
1242     // Send response
1243     await this.sendMessage(messageId, response, Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName);
1244   }
1245
1246   // Simulate charging station restart
1247   handleRequestReset(commandPayload: ResetRequest): DefaultResponse {
1248     setImmediate(async () => {
1249       await this.stop(commandPayload.type + 'Reset' as StopTransactionReason);
1250       await Utils.sleep(this._stationInfo.resetTime);
1251       await this.start();
1252     });
1253     logger.info(`${this._logPrefix()} ${commandPayload.type} reset command received, simulating it. The station will be back online in ${Utils.milliSecondsToHHMMSS(this._stationInfo.resetTime)}`);
1254     return Constants.OCPP_RESPONSE_ACCEPTED;
1255   }
1256
1257   handleRequestClearCache(): DefaultResponse {
1258     return Constants.OCPP_RESPONSE_ACCEPTED;
1259   }
1260
1261   async handleRequestUnlockConnector(commandPayload: UnlockConnectorRequest): Promise<UnlockConnectorResponse> {
1262     const connectorId = Utils.convertToInt(commandPayload.connectorId);
1263     if (connectorId === 0) {
1264       logger.error(this._logPrefix() + ' Trying to unlock connector ' + connectorId.toString());
1265       return Constants.OCPP_RESPONSE_UNLOCK_NOT_SUPPORTED;
1266     }
1267     if (this.getConnector(connectorId).transactionStarted) {
1268       const stopResponse = await this.sendStopTransaction(this.getConnector(connectorId).transactionId, StopTransactionReason.UNLOCK_COMMAND);
1269       if (stopResponse.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
1270         return Constants.OCPP_RESPONSE_UNLOCKED;
1271       }
1272       return Constants.OCPP_RESPONSE_UNLOCK_FAILED;
1273     }
1274     await this.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
1275     return Constants.OCPP_RESPONSE_UNLOCKED;
1276   }
1277
1278   _getConfigurationKey(key: string): ConfigurationKey {
1279     return this._configuration.configurationKey.find((configElement) => configElement.key === key);
1280   }
1281
1282   _addConfigurationKey(key: string, value: string, readonly = false, visible = true, reboot = false): void {
1283     const keyFound = this._getConfigurationKey(key);
1284     if (!keyFound) {
1285       this._configuration.configurationKey.push({
1286         key,
1287         readonly,
1288         value,
1289         visible,
1290         reboot,
1291       });
1292     }
1293   }
1294
1295   _setConfigurationKeyValue(key: string, value: string): void {
1296     const keyFound = this._getConfigurationKey(key);
1297     if (keyFound) {
1298       const keyIndex = this._configuration.configurationKey.indexOf(keyFound);
1299       this._configuration.configurationKey[keyIndex].value = value;
1300     }
1301   }
1302
1303   handleRequestGetConfiguration(commandPayload: GetConfigurationRequest): GetConfigurationResponse {
1304     const configurationKey: ConfigurationKey[] = [];
1305     const unknownKey: string[] = [];
1306     if (Utils.isEmptyArray(commandPayload.key)) {
1307       for (const configuration of this._configuration.configurationKey) {
1308         if (Utils.isUndefined(configuration.visible)) {
1309           configuration.visible = true;
1310         }
1311         if (!configuration.visible) {
1312           continue;
1313         }
1314         configurationKey.push({
1315           key: configuration.key,
1316           readonly: configuration.readonly,
1317           value: configuration.value,
1318         });
1319       }
1320     } else {
1321       for (const key of commandPayload.key) {
1322         const keyFound = this._getConfigurationKey(key);
1323         if (keyFound) {
1324           if (Utils.isUndefined(keyFound.visible)) {
1325             keyFound.visible = true;
1326           }
1327           if (!keyFound.visible) {
1328             continue;
1329           }
1330           configurationKey.push({
1331             key: keyFound.key,
1332             readonly: keyFound.readonly,
1333             value: keyFound.value,
1334           });
1335         } else {
1336           unknownKey.push(key);
1337         }
1338       }
1339     }
1340     return {
1341       configurationKey,
1342       unknownKey,
1343     };
1344   }
1345
1346   handleRequestChangeConfiguration(commandPayload: ChangeConfigurationRequest): ChangeConfigurationResponse {
1347     const keyToChange = this._getConfigurationKey(commandPayload.key);
1348     if (!keyToChange) {
1349       return Constants.OCPP_CONFIGURATION_RESPONSE_NOT_SUPPORTED;
1350     } else if (keyToChange && keyToChange.readonly) {
1351       return Constants.OCPP_CONFIGURATION_RESPONSE_REJECTED;
1352     } else if (keyToChange && !keyToChange.readonly) {
1353       const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
1354       let valueChanged = false;
1355       if (this._configuration.configurationKey[keyIndex].value !== commandPayload.value) {
1356         this._configuration.configurationKey[keyIndex].value = commandPayload.value;
1357         valueChanged = true;
1358       }
1359       let triggerHeartbeatRestart = false;
1360       if (keyToChange.key === 'HeartBeatInterval' && valueChanged) {
1361         this._setConfigurationKeyValue('HeartbeatInterval', commandPayload.value);
1362         triggerHeartbeatRestart = true;
1363       }
1364       if (keyToChange.key === 'HeartbeatInterval' && valueChanged) {
1365         this._setConfigurationKeyValue('HeartBeatInterval', commandPayload.value);
1366         triggerHeartbeatRestart = true;
1367       }
1368       if (triggerHeartbeatRestart) {
1369         this._heartbeatInterval = Utils.convertToInt(commandPayload.value) * 1000;
1370         this._restartHeartbeat();
1371       }
1372       if (keyToChange.key === 'WebSocketPingInterval' && valueChanged) {
1373         this._restartWebSocketPing();
1374       }
1375       if (keyToChange.reboot) {
1376         return Constants.OCPP_CONFIGURATION_RESPONSE_REBOOT_REQUIRED;
1377       }
1378       return Constants.OCPP_CONFIGURATION_RESPONSE_ACCEPTED;
1379     }
1380   }
1381
1382   handleRequestSetChargingProfile(commandPayload: SetChargingProfileRequest): SetChargingProfileResponse {
1383     if (!this.getConnector(commandPayload.connectorId)) {
1384       logger.error(`${this._logPrefix()} Trying to set a charging profile to a non existing connector Id ${commandPayload.connectorId}`);
1385       return Constants.OCPP_CHARGING_PROFILE_RESPONSE_REJECTED;
1386     }
1387     if (commandPayload.csChargingProfiles.chargingProfilePurpose === ChargingProfilePurposeType.TX_PROFILE && !this.getConnector(commandPayload.connectorId)?.transactionStarted) {
1388       return Constants.OCPP_CHARGING_PROFILE_RESPONSE_REJECTED;
1389     }
1390     this.getConnector(commandPayload.connectorId).chargingProfiles.forEach((chargingProfile: ChargingProfile, index: number) => {
1391       if (chargingProfile.chargingProfileId === commandPayload.csChargingProfiles.chargingProfileId
1392         || (chargingProfile.stackLevel === commandPayload.csChargingProfiles.stackLevel && chargingProfile.chargingProfilePurpose === commandPayload.csChargingProfiles.chargingProfilePurpose)) {
1393         this.getConnector(commandPayload.connectorId).chargingProfiles[index] = chargingProfile;
1394         return Constants.OCPP_CHARGING_PROFILE_RESPONSE_ACCEPTED;
1395       }
1396     });
1397     this.getConnector(commandPayload.connectorId).chargingProfiles.push(commandPayload.csChargingProfiles);
1398     return Constants.OCPP_CHARGING_PROFILE_RESPONSE_ACCEPTED;
1399   }
1400
1401   async handleRequestRemoteStartTransaction(commandPayload: RemoteStartTransactionRequest): Promise<DefaultResponse> {
1402     const transactionConnectorID: number = commandPayload.connectorId ? Utils.convertToInt(commandPayload.connectorId) : 1;
1403     if (this._getAuthorizeRemoteTxRequests() && this._getLocalAuthListEnabled() && this.hasAuthorizedTags()) {
1404       // Check if authorized
1405       if (this._authorizedTags.find((value) => value === commandPayload.idTag)) {
1406         // Authorization successful start transaction
1407         await this.sendStartTransaction(transactionConnectorID, commandPayload.idTag);
1408         logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID.toString() + ' for idTag ' + commandPayload.idTag);
1409         return Constants.OCPP_RESPONSE_ACCEPTED;
1410       }
1411       logger.error(this._logPrefix() + ' Remote starting transaction REJECTED, idTag ' + commandPayload.idTag);
1412       return Constants.OCPP_RESPONSE_REJECTED;
1413     }
1414     // No local authorization check required => start transaction
1415     await this.sendStartTransaction(transactionConnectorID, commandPayload.idTag);
1416     logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID.toString() + ' for idTag ' + commandPayload.idTag);
1417     return Constants.OCPP_RESPONSE_ACCEPTED;
1418   }
1419
1420   async handleRequestRemoteStopTransaction(commandPayload: RemoteStopTransactionRequest): Promise<DefaultResponse> {
1421     const transactionId = Utils.convertToInt(commandPayload.transactionId);
1422     for (const connector in this._connectors) {
1423       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
1424         await this.sendStopTransaction(transactionId);
1425         return Constants.OCPP_RESPONSE_ACCEPTED;
1426       }
1427     }
1428     logger.info(this._logPrefix() + ' Trying to remote stop a non existing transaction ' + transactionId.toString());
1429     return Constants.OCPP_RESPONSE_REJECTED;
1430   }
1431 }
1432