src/charging-station/ChargingStation.ts

   1 import { BootNotificationResponse, RegistrationStatus } from '../types/ocpp/RequestResponses';
   2 import ChargingStationConfiguration, { ConfigurationKey } from '../types/ChargingStationConfiguration';
   3 import ChargingStationTemplate, { PowerOutType, VoltageOut } from '../types/ChargingStationTemplate';
   4 import Connectors, { Connector } from '../types/Connectors';
   5 import { PerformanceObserver, performance } from 'perf_hooks';
   6 import Requests, { AvailabilityType, BootNotificationRequest, IncomingRequest, IncomingRequestCommand } from '../types/ocpp/Requests';
   7 import WebSocket, { MessageEvent } from 'ws';
   8
   9 import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
  10 import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
  11 import { ChargingProfile } from '../types/ocpp/ChargingProfile';
  12 import ChargingStationInfo from '../types/ChargingStationInfo';
  13 import Configuration from '../utils/Configuration';
  14 import Constants from '../utils/Constants';
  15 import { MessageType } from '../types/ocpp/MessageType';
  16 import { MeterValueMeasurand } from '../types/ocpp/MeterValues';
  17 import OCPP16IncomingRequestService from './ocpp/1.6/OCCP16IncomingRequestService';
  18 import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
  19 import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
  20 import OCPPError from './OcppError';
  21 import OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
  22 import OCPPRequestService from './ocpp/OCPPRequestService';
  23 import { OCPPVersion } from '../types/ocpp/OCPPVersion';
  24 import { StandardParametersKey } from '../types/ocpp/Configuration';
  25 import Statistics from '../utils/Statistics';
  26 import { StopTransactionReason } from '../types/ocpp/Transaction';
  27 import Utils from '../utils/Utils';
  28 import { WebSocketCloseEventStatusCode } from '../types/WebSocket';
  29 import crypto from 'crypto';
  30 import fs from 'fs';
  31 import logger from '../utils/Logger';
  32
  33 export default class ChargingStation {
  34   public stationTemplateFile: string;
  35   public authorizedTags: string[];
  36   public stationInfo: ChargingStationInfo;
  37   public connectors: Connectors;
  38   public configuration: ChargingStationConfiguration;
  39   public hasStopped: boolean;
  40   public wsConnection: WebSocket;
  41   public requests: Requests;
  42   public messageQueue: string[];
  43   public statistics: Statistics;
  44   public heartbeatSetInterval: NodeJS.Timeout;
  45   public ocppIncomingRequestService: OCPPIncomingRequestService;
  46   public ocppRequestService: OCPPRequestService;
  47   private index: number;
  48   private bootNotificationRequest: BootNotificationRequest;
  49   private bootNotificationResponse: BootNotificationResponse;
  50   private connectorsConfigurationHash: string;
  51   private supervisionUrl: string;
  52   private wsConnectionUrl: string;
  53   private hasSocketRestarted: boolean;
  54   private autoReconnectRetryCount: number;
  55   private automaticTransactionGeneration: AutomaticTransactionGenerator;
  56   private performanceObserver: PerformanceObserver;
  57   private webSocketPingSetInterval: NodeJS.Timeout;
  58
  59   constructor(index: number, stationTemplateFile: string) {
  60     this.index = index;
  61     this.stationTemplateFile = stationTemplateFile;
  62     this.connectors = {} as Connectors;
  63     this.initialize();
  64
  65     this.hasStopped = false;
  66     this.hasSocketRestarted = false;
  67     this.autoReconnectRetryCount = 0;
  68
  69     this.requests = {} as Requests;
  70     this.messageQueue = [] as string[];
  71
  72     this.authorizedTags = this.getAuthorizedTags();
  73   }
  74
  75   public logPrefix(): string {
  76     return Utils.logPrefix(` ${this.stationInfo.chargingStationId}:`);
  77   }
  78
  79   public getRandomTagId(): string {
  80     const index = Math.floor(Math.random() * this.authorizedTags.length);
  81     return this.authorizedTags[index];
  82   }
  83
  84   public hasAuthorizedTags(): boolean {
  85     return !Utils.isEmptyArray(this.authorizedTags);
  86   }
  87
  88   public getEnableStatistics(): boolean {
  89     return !Utils.isUndefined(this.stationInfo.enableStatistics) ? this.stationInfo.enableStatistics : true;
  90   }
  91
  92   public getNumberOfPhases(): number {
  93     switch (this.getPowerOutType()) {
  94       case PowerOutType.AC:
  95         return !Utils.isUndefined(this.stationInfo.numberOfPhases) ? this.stationInfo.numberOfPhases : 3;
  96       case PowerOutType.DC:
  97         return 0;
  98     }
  99   }
 100
 101   public isWebSocketOpen(): boolean {
 102     return this.wsConnection?.readyState === WebSocket.OPEN;
 103   }
 104
 105   public isRegistered(): boolean {
 106     return this.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
 107   }
 108
 109   public isChargingStationAvailable(): boolean {
 110     return this.getConnector(0).availability === AvailabilityType.OPERATIVE;
 111   }
 112
 113   public isConnectorAvailable(id: number): boolean {
 114     return this.getConnector(id).availability === AvailabilityType.OPERATIVE;
 115   }
 116
 117   public getConnector(id: number): Connector {
 118     return this.connectors[id];
 119   }
 120
 121   public getPowerOutType(): PowerOutType {
 122     return !Utils.isUndefined(this.stationInfo.powerOutType) ? this.stationInfo.powerOutType : PowerOutType.AC;
 123   }
 124
 125   public getVoltageOut(): number {
 126     const errMsg = `${this.logPrefix()} Unknown ${this.getPowerOutType()} powerOutType in template file ${this.stationTemplateFile}, cannot define default voltage out`;
 127     let defaultVoltageOut: number;
 128     switch (this.getPowerOutType()) {
 129       case PowerOutType.AC:
 130         defaultVoltageOut = VoltageOut.VOLTAGE_230;
 131         break;
 132       case PowerOutType.DC:
 133         defaultVoltageOut = VoltageOut.VOLTAGE_400;
 134         break;
 135       default:
 136         logger.error(errMsg);
 137         throw Error(errMsg);
 138     }
 139     return !Utils.isUndefined(this.stationInfo.voltageOut) ? this.stationInfo.voltageOut : defaultVoltageOut;
 140   }
 141
 142   public getTransactionIdTag(transactionId: number): string {
 143     for (const connector in this.connectors) {
 144       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 145         return this.getConnector(Utils.convertToInt(connector)).idTag;
 146       }
 147     }
 148   }
 149
 150   public getTransactionMeterStop(transactionId: number): number {
 151     for (const connector in this.connectors) {
 152       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
 153         return this.getConnector(Utils.convertToInt(connector)).lastEnergyActiveImportRegisterValue;
 154       }
 155     }
 156   }
 157
 158   public getAuthorizeRemoteTxRequests(): boolean {
 159     const authorizeRemoteTxRequests = this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests);
 160     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 161   }
 162
 163   public getLocalAuthListEnabled(): boolean {
 164     const localAuthListEnabled = this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled);
 165     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 166   }
 167
 168   public restartWebSocketPing(): void {
 169     // Stop WebSocket ping
 170     this.stopWebSocketPing();
 171     // Start WebSocket ping
 172     this.startWebSocketPing();
 173   }
 174
 175   public startHeartbeat(): void {
 176     if (this.getHeartbeatInterval() && this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
 177       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 178       this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
 179         await this.ocppRequestService.sendHeartbeat();
 180       }, this.getHeartbeatInterval());
 181       logger.info(this.logPrefix() + ' Heartbeat started every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()));
 182     } else if (this.heartbeatSetInterval) {
 183       logger.info(this.logPrefix() + ' Heartbeat every ' + Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()) + ' already started');
 184     } else {
 185       logger.error(`${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval() ? Utils.milliSecondsToHHMMSS(this.getHeartbeatInterval()) : this.getHeartbeatInterval()}, not starting the heartbeat`);
 186     }
 187   }
 188
 189   public restartHeartbeat(): void {
 190     // Stop heartbeat
 191     this.stopHeartbeat();
 192     // Start heartbeat
 193     this.startHeartbeat();
 194   }
 195
 196   public startMeterValues(connectorId: number, interval: number): void {
 197     if (connectorId === 0) {
 198       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`);
 199       return;
 200     }
 201     if (!this.getConnector(connectorId)) {
 202       logger.error(`${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`);
 203       return;
 204     }
 205     if (!this.getConnector(connectorId)?.transactionStarted) {
 206       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
 207       return;
 208     } else if (this.getConnector(connectorId)?.transactionStarted && !this.getConnector(connectorId)?.transactionId) {
 209       logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
 210       return;
 211     }
 212     if (interval > 0) {
 213       // eslint-disable-next-line @typescript-eslint/no-misused-promises
 214       this.getConnector(connectorId).transactionSetInterval = setInterval(async (): Promise<void> => {
 215         if (this.getEnableStatistics()) {
 216           const sendMeterValues = performance.timerify(this.ocppRequestService.sendMeterValues);
 217           this.performanceObserver.observe({
 218             entryTypes: ['function'],
 219           });
 220           await sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 221         } else {
 222           await this.ocppRequestService.sendMeterValues(connectorId, this.getConnector(connectorId).transactionId, interval, this.ocppRequestService);
 223         }
 224       }, interval);
 225     } else {
 226       logger.error(`${this.logPrefix()} Charging station ${StandardParametersKey.MeterValueSampleInterval} configuration set to ${Utils.milliSecondsToHHMMSS(interval)}, not sending MeterValues`);
 227     }
 228   }
 229
 230   public start(): void {
 231     this.openWSConnection();
 232     // Monitor authorization file
 233     this.startAuthorizationFileMonitoring();
 234     // Monitor station template file
 235     this.startStationTemplateFileMonitoring();
 236     // Handle Socket incoming messages
 237     this.wsConnection.on('message', this.onMessage.bind(this));
 238     // Handle Socket error
 239     this.wsConnection.on('error', this.onError.bind(this));
 240     // Handle Socket close
 241     this.wsConnection.on('close', this.onClose.bind(this));
 242     // Handle Socket opening connection
 243     this.wsConnection.on('open', this.onOpen.bind(this));
 244     // Handle Socket ping
 245     this.wsConnection.on('ping', this.onPing.bind(this));
 246     // Handle Socket pong
 247     this.wsConnection.on('pong', this.onPong.bind(this));
 248   }
 249
 250   public async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 251     // Stop message sequence
 252     await this.stopMessageSequence(reason);
 253     for (const connector in this.connectors) {
 254       if (Utils.convertToInt(connector) > 0) {
 255         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.UNAVAILABLE);
 256         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.UNAVAILABLE;
 257       }
 258     }
 259     if (this.isWebSocketOpen()) {
 260       this.wsConnection.close();
 261     }
 262     this.bootNotificationResponse = null;
 263     this.hasStopped = true;
 264   }
 265
 266   public getConfigurationKey(key: string | StandardParametersKey, caseInsensitive = false): ConfigurationKey {
 267     const configurationKey: ConfigurationKey = this.configuration.configurationKey.find((configElement) => {
 268       if (caseInsensitive) {
 269         return configElement.key.toLowerCase() === key.toLowerCase();
 270       }
 271       return configElement.key === key;
 272     });
 273     return configurationKey;
 274   }
 275
 276   public addConfigurationKey(key: string | StandardParametersKey, value: string, readonly = false, visible = true, reboot = false): void {
 277     const keyFound = this.getConfigurationKey(key);
 278     if (!keyFound) {
 279       this.configuration.configurationKey.push({
 280         key,
 281         readonly,
 282         value,
 283         visible,
 284         reboot,
 285       });
 286     } else {
 287       logger.error(`${this.logPrefix()} Trying to add an already existing configuration key: %j`, keyFound);
 288     }
 289   }
 290
 291   public setConfigurationKeyValue(key: string | StandardParametersKey, value: string): void {
 292     const keyFound = this.getConfigurationKey(key);
 293     if (keyFound) {
 294       const keyIndex = this.configuration.configurationKey.indexOf(keyFound);
 295       this.configuration.configurationKey[keyIndex].value = value;
 296     } else {
 297       logger.error(`${this.logPrefix()} Trying to set a value on a non existing configuration key: %j`, { key, value });
 298     }
 299   }
 300
 301   public setChargingProfile(connectorId: number, cp: ChargingProfile): boolean {
 302     if (!Utils.isEmptyArray(this.getConnector(connectorId).chargingProfiles)) {
 303       this.getConnector(connectorId).chargingProfiles.forEach((chargingProfile: ChargingProfile, index: number) => {
 304         if (chargingProfile.chargingProfileId === cp.chargingProfileId
 305           || (chargingProfile.stackLevel === cp.stackLevel && chargingProfile.chargingProfilePurpose === cp.chargingProfilePurpose)) {
 306           this.getConnector(connectorId).chargingProfiles[index] = cp;
 307           return true;
 308         }
 309       });
 310     }
 311     this.getConnector(connectorId).chargingProfiles.push(cp);
 312     return true;
 313   }
 314
 315   public resetTransactionOnConnector(connectorId: number): void {
 316     this.initTransactionOnConnector(connectorId);
 317     if (this.getConnector(connectorId)?.transactionSetInterval) {
 318       clearInterval(this.getConnector(connectorId).transactionSetInterval);
 319     }
 320   }
 321
 322   private getChargingStationId(stationTemplate: ChargingStationTemplate): string {
 323     // In case of multiple instances: add instance index to charging station id
 324     let instanceIndex = process.env.CF_INSTANCE_INDEX ? process.env.CF_INSTANCE_INDEX : 0;
 325     instanceIndex = instanceIndex > 0 ? instanceIndex : '';
 326     const idSuffix = stationTemplate.nameSuffix ? stationTemplate.nameSuffix : '';
 327     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + instanceIndex.toString() + ('000000000' + this.index.toString()).substr(('000000000' + this.index.toString()).length - 4) + idSuffix;
 328   }
 329
 330   private buildStationInfo(): ChargingStationInfo {
 331     let stationTemplateFromFile: ChargingStationTemplate;
 332     try {
 333       // Load template file
 334       const fileDescriptor = fs.openSync(this.stationTemplateFile, 'r');
 335       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
 336       fs.closeSync(fileDescriptor);
 337     } catch (error) {
 338       logger.error('Template file ' + this.stationTemplateFile + ' loading error: %j', error);
 339       throw error;
 340     }
 341     const stationInfo: ChargingStationInfo = stationTemplateFromFile || {} as ChargingStationInfo;
 342     if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
 343       stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
 344       stationInfo.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
 345     } else {
 346       stationInfo.maxPower = stationTemplateFromFile.power as number;
 347     }
 348     stationInfo.chargingStationId = this.getChargingStationId(stationTemplateFromFile);
 349     stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
 350     return stationInfo;
 351   }
 352
 353   private getOCPPVersion(): OCPPVersion {
 354     return this.stationInfo.ocppVersion ? this.stationInfo.ocppVersion : OCPPVersion.VERSION_16;
 355   }
 356
 357   private handleUnsupportedVersion(version: OCPPVersion) {
 358     const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${this.stationTemplateFile}`;
 359     logger.error(errMsg);
 360     throw new Error(errMsg);
 361   }
 362
 363   private initialize(): void {
 364     this.stationInfo = this.buildStationInfo();
 365     this.bootNotificationRequest = {
 366       chargePointModel: this.stationInfo.chargePointModel,
 367       chargePointVendor: this.stationInfo.chargePointVendor,
 368       ...!Utils.isUndefined(this.stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this.stationInfo.chargeBoxSerialNumberPrefix },
 369       ...!Utils.isUndefined(this.stationInfo.firmwareVersion) && { firmwareVersion: this.stationInfo.firmwareVersion },
 370     };
 371     this.configuration = this.getTemplateChargingStationConfiguration();
 372     this.supervisionUrl = this.getSupervisionURL();
 373     this.wsConnectionUrl = this.supervisionUrl + '/' + this.stationInfo.chargingStationId;
 374     // Build connectors if needed
 375     const maxConnectors = this.getMaxNumberOfConnectors();
 376     if (maxConnectors <= 0) {
 377       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with ${maxConnectors} connectors`);
 378     }
 379     const templateMaxConnectors = this.getTemplateMaxNumberOfConnectors();
 380     if (templateMaxConnectors <= 0) {
 381       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector configuration`);
 382     }
 383     if (!this.stationInfo.Connectors[0]) {
 384       logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector Id 0 configuration`);
 385     }
 386     // Sanity check
 387     if (maxConnectors > (this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this.stationInfo.randomConnectors) {
 388       logger.warn(`${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this.stationTemplateFile}, forcing random connector configurations affectation`);
 389       this.stationInfo.randomConnectors = true;
 390     }
 391     const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this.stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
 392     // FIXME: Handle shrinking the number of connectors
 393     if (!this.connectors || (this.connectors && this.connectorsConfigurationHash !== connectorsConfigHash)) {
 394       this.connectorsConfigurationHash = connectorsConfigHash;
 395       // Add connector Id 0
 396       let lastConnector = '0';
 397       for (lastConnector in this.stationInfo.Connectors) {
 398         if (Utils.convertToInt(lastConnector) === 0 && this.getUseConnectorId0() && this.stationInfo.Connectors[lastConnector]) {
 399           this.connectors[lastConnector] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[lastConnector]);
 400           this.connectors[lastConnector].availability = AvailabilityType.OPERATIVE;
 401           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 402             this.connectors[lastConnector].chargingProfiles = [];
 403           }
 404         }
 405       }
 406       // Generate all connectors
 407       if ((this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
 408         for (let index = 1; index <= maxConnectors; index++) {
 409           const randConnectorID = this.stationInfo.randomConnectors ? Utils.getRandomInt(Utils.convertToInt(lastConnector), 1) : index;
 410           this.connectors[index] = Utils.cloneObject<Connector>(this.stationInfo.Connectors[randConnectorID]);
 411           this.connectors[index].availability = AvailabilityType.OPERATIVE;
 412           if (Utils.isUndefined(this.connectors[lastConnector]?.chargingProfiles)) {
 413             this.connectors[index].chargingProfiles = [];
 414           }
 415         }
 416       }
 417     }
 418     // Avoid duplication of connectors related information
 419     delete this.stationInfo.Connectors;
 420     // Initialize transaction attributes on connectors
 421     for (const connector in this.connectors) {
 422       if (Utils.convertToInt(connector) > 0 && !this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 423         this.initTransactionOnConnector(Utils.convertToInt(connector));
 424       }
 425     }
 426     switch (this.getOCPPVersion()) {
 427       case OCPPVersion.VERSION_16:
 428         this.ocppIncomingRequestService = new OCPP16IncomingRequestService(this);
 429         this.ocppRequestService = new OCPP16RequestService(this, new OCPP16ResponseService(this));
 430         break;
 431       default:
 432         this.handleUnsupportedVersion(this.getOCPPVersion());
 433         break;
 434     }
 435     // OCPP parameters
 436     this.addConfigurationKey(StandardParametersKey.NumberOfConnectors, this.getNumberOfConnectors().toString(), true);
 437     if (!this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData)) {
 438       this.addConfigurationKey(StandardParametersKey.MeterValuesSampledData, MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
 439     }
 440     this.stationInfo.powerDivider = this.getPowerDivider();
 441     if (this.getEnableStatistics()) {
 442       this.statistics = new Statistics(this.stationInfo.chargingStationId);
 443       this.performanceObserver = new PerformanceObserver((list) => {
 444         const entry = list.getEntries()[0];
 445         this.statistics.logPerformance(entry, Constants.ENTITY_CHARGING_STATION);
 446         this.performanceObserver.disconnect();
 447       });
 448     }
 449   }
 450
 451   private async onOpen(): Promise<void> {
 452     logger.info(`${this.logPrefix()} Is connected to server through ${this.wsConnectionUrl}`);
 453     if (!this.isRegistered()) {
 454       // Send BootNotification
 455       let registrationRetryCount = 0;
 456       do {
 457         this.bootNotificationResponse = await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel, this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
 458         if (!this.isRegistered()) {
 459           registrationRetryCount++;
 460           await Utils.sleep(this.bootNotificationResponse?.interval ? this.bootNotificationResponse.interval * 1000 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL);
 461         }
 462       } while (!this.isRegistered() && (registrationRetryCount <= this.getRegistrationMaxRetries() || this.getRegistrationMaxRetries() === -1));
 463     } else if (this.isRegistered()) {
 464       await this.startMessageSequence();
 465       this.hasStopped && (this.hasStopped = false);
 466       if (this.hasSocketRestarted && this.isWebSocketOpen()) {
 467         if (!Utils.isEmptyArray(this.messageQueue)) {
 468           this.messageQueue.forEach((message, index) => {
 469             this.messageQueue.splice(index, 1);
 470             this.wsConnection.send(message);
 471           });
 472         }
 473       }
 474     } else {
 475       logger.error(`${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`);
 476     }
 477     this.autoReconnectRetryCount = 0;
 478     this.hasSocketRestarted = false;
 479   }
 480
 481   private async onClose(closeEvent): Promise<void> {
 482     switch (closeEvent) {
 483       case WebSocketCloseEventStatusCode.CLOSE_NORMAL: // Normal close
 484       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
 485         logger.info(`${this.logPrefix()} Socket normally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
 486         this.autoReconnectRetryCount = 0;
 487         break;
 488       default: // Abnormal close
 489         logger.error(`${this.logPrefix()} Socket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
 490         await this.reconnect(closeEvent);
 491         break;
 492     }
 493   }
 494
 495   private async onMessage(messageEvent: MessageEvent): Promise<void> {
 496     let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, {}, {}];
 497     let responseCallback: (payload?: Record<string, unknown> | string, requestPayload?: Record<string, unknown>) => void;
 498     let rejectCallback: (error: OCPPError) => void;
 499     let requestPayload: Record<string, unknown>;
 500     let errMsg: string;
 501     try {
 502       // Parse the message
 503       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(messageEvent.toString()) as IncomingRequest;
 504
 505       // Check the Type of message
 506       switch (messageType) {
 507         // Incoming Message
 508         case MessageType.CALL_MESSAGE:
 509           if (this.getEnableStatistics()) {
 510             this.statistics.addMessage(commandName, messageType);
 511           }
 512           // Process the call
 513           await this.ocppIncomingRequestService.handleRequest(messageId, commandName, commandPayload);
 514           break;
 515         // Outcome Message
 516         case MessageType.CALL_RESULT_MESSAGE:
 517           // Respond
 518           if (Utils.isIterable(this.requests[messageId])) {
 519             [responseCallback, , requestPayload] = this.requests[messageId];
 520           } else {
 521             throw new Error(`Response request for message id ${messageId} is not iterable`);
 522           }
 523           if (!responseCallback) {
 524             // Error
 525             throw new Error(`Response request for unknown message id ${messageId}`);
 526           }
 527           delete this.requests[messageId];
 528           responseCallback(commandName, requestPayload);
 529           break;
 530         // Error Message
 531         case MessageType.CALL_ERROR_MESSAGE:
 532           if (!this.requests[messageId]) {
 533             // Error
 534             throw new Error(`Error request for unknown message id ${messageId}`);
 535           }
 536           if (Utils.isIterable(this.requests[messageId])) {
 537             [, rejectCallback] = this.requests[messageId];
 538           } else {
 539             throw new Error(`Error request for message id ${messageId} is not iterable`);
 540           }
 541           delete this.requests[messageId];
 542           rejectCallback(new OCPPError(commandName, commandPayload.toString(), errorDetails));
 543           break;
 544         // Error
 545         default:
 546           errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
 547           logger.error(errMsg);
 548           throw new Error(errMsg);
 549       }
 550     } catch (error) {
 551       // Log
 552       logger.error('%s Incoming message %j processing error %j on request content type %j', this.logPrefix(), messageEvent, error, this.requests[messageId]);
 553       // Send error
 554       messageType !== MessageType.CALL_ERROR_MESSAGE && await this.ocppRequestService.sendError(messageId, error, commandName);
 555     }
 556   }
 557
 558   private onPing(): void {
 559     logger.debug(this.logPrefix() + ' Has received a WS ping (rfc6455) from the server');
 560   }
 561
 562   private onPong(): void {
 563     logger.debug(this.logPrefix() + ' Has received a WS pong (rfc6455) from the server');
 564   }
 565
 566   private async onError(errorEvent): Promise<void> {
 567     logger.error(this.logPrefix() + ' Socket error: %j', errorEvent);
 568     // pragma switch (errorEvent.code) {
 569     //   case 'ECONNREFUSED':
 570     //     await this._reconnect(errorEvent);
 571     //     break;
 572     // }
 573   }
 574
 575   private getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
 576     return this.stationInfo.Configuration ? this.stationInfo.Configuration : {} as ChargingStationConfiguration;
 577   }
 578
 579   private getAuthorizationFile(): string {
 580     return this.stationInfo.authorizationFile && this.stationInfo.authorizationFile;
 581   }
 582
 583   private getAuthorizedTags(): string[] {
 584     let authorizedTags: string[] = [];
 585     const authorizationFile = this.getAuthorizationFile();
 586     if (authorizationFile) {
 587       try {
 588         // Load authorization file
 589         const fileDescriptor = fs.openSync(authorizationFile, 'r');
 590         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
 591         fs.closeSync(fileDescriptor);
 592       } catch (error) {
 593         logger.error(this.logPrefix() + ' Authorization file ' + authorizationFile + ' loading error: %j', error);
 594         throw error;
 595       }
 596     } else {
 597       logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile);
 598     }
 599     return authorizedTags;
 600   }
 601
 602   private getUseConnectorId0(): boolean {
 603     return !Utils.isUndefined(this.stationInfo.useConnectorId0) ? this.stationInfo.useConnectorId0 : true;
 604   }
 605
 606   private getNumberOfRunningTransactions(): number {
 607     let trxCount = 0;
 608     for (const connector in this.connectors) {
 609       if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 610         trxCount++;
 611       }
 612     }
 613     return trxCount;
 614   }
 615
 616   // 0 for disabling
 617   private getConnectionTimeout(): number {
 618     if (!Utils.isUndefined(this.stationInfo.connectionTimeout)) {
 619       return this.stationInfo.connectionTimeout;
 620     }
 621     if (!Utils.isUndefined(Configuration.getConnectionTimeout())) {
 622       return Configuration.getConnectionTimeout();
 623     }
 624     return 30;
 625   }
 626
 627   // -1 for unlimited, 0 for disabling
 628   private getAutoReconnectMaxRetries(): number {
 629     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
 630       return this.stationInfo.autoReconnectMaxRetries;
 631     }
 632     if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
 633       return Configuration.getAutoReconnectMaxRetries();
 634     }
 635     return -1;
 636   }
 637
 638   // 0 for disabling
 639   private getRegistrationMaxRetries(): number {
 640     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
 641       return this.stationInfo.registrationMaxRetries;
 642     }
 643     return -1;
 644   }
 645
 646   private getPowerDivider(): number {
 647     let powerDivider = this.getNumberOfConnectors();
 648     if (this.stationInfo.powerSharedByConnectors) {
 649       powerDivider = this.getNumberOfRunningTransactions();
 650     }
 651     return powerDivider;
 652   }
 653
 654   private getTemplateMaxNumberOfConnectors(): number {
 655     return Object.keys(this.stationInfo.Connectors).length;
 656   }
 657
 658   private getMaxNumberOfConnectors(): number {
 659     let maxConnectors = 0;
 660     if (!Utils.isEmptyArray(this.stationInfo.numberOfConnectors)) {
 661       const numberOfConnectors = this.stationInfo.numberOfConnectors as number[];
 662       // Distribute evenly the number of connectors
 663       maxConnectors = numberOfConnectors[(this.index - 1) % numberOfConnectors.length];
 664     } else if (!Utils.isUndefined(this.stationInfo.numberOfConnectors)) {
 665       maxConnectors = this.stationInfo.numberOfConnectors as number;
 666     } else {
 667       maxConnectors = this.stationInfo.Connectors[0] ? this.getTemplateMaxNumberOfConnectors() - 1 : this.getTemplateMaxNumberOfConnectors();
 668     }
 669     return maxConnectors;
 670   }
 671
 672   private getNumberOfConnectors(): number {
 673     return this.connectors[0] ? Object.keys(this.connectors).length - 1 : Object.keys(this.connectors).length;
 674   }
 675
 676   private async startMessageSequence(): Promise<void> {
 677     // Start WebSocket ping
 678     this.startWebSocketPing();
 679     // Start heartbeat
 680     this.startHeartbeat();
 681     // Initialize connectors status
 682     for (const connector in this.connectors) {
 683       if (Utils.convertToInt(connector) === 0) {
 684         continue;
 685       } else if (!this.hasStopped && !this.getConnector(Utils.convertToInt(connector))?.status && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 686         // Send status in template at startup
 687         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 688         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 689       } else if (this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.bootStatus) {
 690         // Send status in template after reset
 691         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
 692         this.getConnector(Utils.convertToInt(connector)).status = this.getConnector(Utils.convertToInt(connector)).bootStatus;
 693       } else if (!this.hasStopped && this.getConnector(Utils.convertToInt(connector))?.status) {
 694         // Send previous status at template reload
 695         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).status);
 696       } else {
 697         // Send default status
 698         await this.ocppRequestService.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.AVAILABLE);
 699         this.getConnector(Utils.convertToInt(connector)).status = ChargePointStatus.AVAILABLE;
 700       }
 701     }
 702     // Start the ATG
 703     if (this.stationInfo.AutomaticTransactionGenerator.enable) {
 704       if (!this.automaticTransactionGeneration) {
 705         this.automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 706       }
 707       if (this.automaticTransactionGeneration.timeToStop) {
 708         await this.automaticTransactionGeneration.start();
 709       }
 710     }
 711     if (this.getEnableStatistics()) {
 712       this.statistics.start();
 713     }
 714   }
 715
 716   private async stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
 717     // Stop WebSocket ping
 718     this.stopWebSocketPing();
 719     // Stop heartbeat
 720     this.stopHeartbeat();
 721     // Stop the ATG
 722     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
 723       this.automaticTransactionGeneration &&
 724       !this.automaticTransactionGeneration.timeToStop) {
 725       await this.automaticTransactionGeneration.stop(reason);
 726     } else {
 727       for (const connector in this.connectors) {
 728         if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
 729           const transactionId = this.getConnector(Utils.convertToInt(connector)).transactionId;
 730           await this.ocppRequestService.sendStopTransaction(transactionId, this.getTransactionMeterStop(transactionId), this.getTransactionIdTag(transactionId), reason);
 731         }
 732       }
 733     }
 734   }
 735
 736   private startWebSocketPing(): void {
 737     const webSocketPingInterval: number = this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval) ? Utils.convertToInt(this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval).value) : 0;
 738     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
 739       this.webSocketPingSetInterval = setInterval(() => {
 740         if (this.isWebSocketOpen()) {
 741           this.wsConnection.ping((): void => { });
 742         }
 743       }, webSocketPingInterval * 1000);
 744       logger.info(this.logPrefix() + ' WebSocket ping started every ' + Utils.secondsToHHMMSS(webSocketPingInterval));
 745     } else if (this.webSocketPingSetInterval) {
 746       logger.info(this.logPrefix() + ' WebSocket ping every ' + Utils.secondsToHHMMSS(webSocketPingInterval) + ' already started');
 747     } else {
 748       logger.error(`${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.secondsToHHMMSS(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
 749     }
 750   }
 751
 752   private stopWebSocketPing(): void {
 753     if (this.webSocketPingSetInterval) {
 754       clearInterval(this.webSocketPingSetInterval);
 755       this.webSocketPingSetInterval = null;
 756     }
 757   }
 758
 759   private getSupervisionURL(): string {
 760     const supervisionUrls = Utils.cloneObject<string | string[]>(this.stationInfo.supervisionURL ? this.stationInfo.supervisionURL : Configuration.getSupervisionURLs());
 761     let indexUrl = 0;
 762     if (!Utils.isEmptyArray(supervisionUrls)) {
 763       if (Configuration.getDistributeStationsToTenantsEqually()) {
 764         indexUrl = this.index % supervisionUrls.length;
 765       } else {
 766         // Get a random url
 767         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 768       }
 769       return supervisionUrls[indexUrl];
 770     }
 771     return supervisionUrls as string;
 772   }
 773
 774   private getHeartbeatInterval(): number {
 775     const HeartbeatInterval = this.getConfigurationKey(StandardParametersKey.HeartbeatInterval);
 776     if (HeartbeatInterval) {
 777       return Utils.convertToInt(HeartbeatInterval.value) * 1000;
 778     }
 779     const HeartBeatInterval = this.getConfigurationKey(StandardParametersKey.HeartBeatInterval);
 780     if (HeartBeatInterval) {
 781       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
 782     }
 783   }
 784
 785   private stopHeartbeat(): void {
 786     if (this.heartbeatSetInterval) {
 787       clearInterval(this.heartbeatSetInterval);
 788       this.heartbeatSetInterval = null;
 789     }
 790   }
 791
 792   private openWSConnection(options?: WebSocket.ClientOptions, forceCloseOpened = false): void {
 793     if (Utils.isUndefined(options)) {
 794       options = {} as WebSocket.ClientOptions;
 795     }
 796     if (Utils.isUndefined(options.handshakeTimeout)) {
 797       options.handshakeTimeout = this.getConnectionTimeout() * 1000;
 798     }
 799     if (this.isWebSocketOpen() && forceCloseOpened) {
 800       this.wsConnection.close();
 801     }
 802     let protocol;
 803     switch (this.getOCPPVersion()) {
 804       case OCPPVersion.VERSION_16:
 805         protocol = 'ocpp' + OCPPVersion.VERSION_16;
 806         break;
 807       default:
 808         this.handleUnsupportedVersion(this.getOCPPVersion());
 809         break;
 810     }
 811     this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
 812     logger.info(this.logPrefix() + ' Will communicate through URL ' + this.supervisionUrl);
 813   }
 814
 815   private startAuthorizationFileMonitoring(): void {
 816     fs.watch(this.getAuthorizationFile()).on('change', (e) => {
 817       try {
 818         logger.debug(this.logPrefix() + ' Authorization file ' + this.getAuthorizationFile() + ' have changed, reload');
 819         // Initialize authorizedTags
 820         this.authorizedTags = this.getAuthorizedTags();
 821       } catch (error) {
 822         logger.error(this.logPrefix() + ' Authorization file monitoring error: %j', error);
 823       }
 824     });
 825   }
 826
 827   private startStationTemplateFileMonitoring(): void {
 828     // eslint-disable-next-line @typescript-eslint/no-misused-promises
 829     fs.watch(this.stationTemplateFile).on('change', async (e): Promise<void> => {
 830       try {
 831         logger.debug(this.logPrefix() + ' Template file ' + this.stationTemplateFile + ' have changed, reload');
 832         // Initialize
 833         this.initialize();
 834         // Stop the ATG
 835         if (!this.stationInfo.AutomaticTransactionGenerator.enable &&
 836           this.automaticTransactionGeneration) {
 837           await this.automaticTransactionGeneration.stop();
 838         }
 839         // Start the ATG
 840         if (this.stationInfo.AutomaticTransactionGenerator.enable) {
 841           if (!this.automaticTransactionGeneration) {
 842             this.automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 843           }
 844           if (this.automaticTransactionGeneration.timeToStop) {
 845             await this.automaticTransactionGeneration.start();
 846           }
 847         }
 848         // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
 849       } catch (error) {
 850         logger.error(this.logPrefix() + ' Charging station template file monitoring error: %j', error);
 851       }
 852     });
 853   }
 854
 855   private getReconnectExponentialDelay(): boolean {
 856     return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay) ? this.stationInfo.reconnectExponentialDelay : false;
 857   }
 858
 859   private async reconnect(error): Promise<void> {
 860     // Stop heartbeat
 861     this.stopHeartbeat();
 862     // Stop the ATG if needed
 863     if (this.stationInfo.AutomaticTransactionGenerator.enable &&
 864       this.stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
 865       this.automaticTransactionGeneration &&
 866       !this.automaticTransactionGeneration.timeToStop) {
 867       this.automaticTransactionGeneration.stop().catch(() => { });
 868     }
 869     if (this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() || this.getAutoReconnectMaxRetries() === -1) {
 870       this.autoReconnectRetryCount++;
 871       const reconnectDelay = (this.getReconnectExponentialDelay() ? Utils.exponentialDelay(this.autoReconnectRetryCount) : this.getConnectionTimeout() * 1000);
 872       logger.error(`${this.logPrefix()} Socket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectDelay - 100}ms`);
 873       await Utils.sleep(reconnectDelay);
 874       logger.error(this.logPrefix() + ' Socket: reconnecting try #' + this.autoReconnectRetryCount.toString());
 875       this.openWSConnection({ handshakeTimeout: reconnectDelay - 100 });
 876       this.hasSocketRestarted = true;
 877     } else if (this.getAutoReconnectMaxRetries() !== -1) {
 878       logger.error(`${this.logPrefix()} Socket reconnect failure: max retries reached (${this.autoReconnectRetryCount}) or retry disabled (${this.getAutoReconnectMaxRetries()})`);
 879     }
 880   }
 881
 882   private initTransactionOnConnector(connectorId: number): void {
 883     this.getConnector(connectorId).transactionStarted = false;
 884     this.getConnector(connectorId).transactionId = null;
 885     this.getConnector(connectorId).idTag = null;
 886     this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = -1;
 887   }
 888 }
 889