X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fcharging-station%2FChargingStation.ts;h=411c452217e7e166bf77a47a1bf486836054616c;hb=caad9d6b03dbfc507da6d8e79ccbbaf74593e981;hp=4adaa289486b79113eaa1ee72dbe48cbb29d860a;hpb=1f761b9af1c816fa55ce0d35b69666b7a5c28579;p=e-mobility-charging-stations-simulator.git

diff --git a/src/charging-station/ChargingStation.ts b/src/charging-station/ChargingStation.ts
index 4adaa289..6be15b83 100644
--- a/src/charging-station/ChargingStation.ts
+++ b/src/charging-station/ChargingStation.ts
@@ -1,1459 +1,1144 @@
-import { AuthorizationStatus, StartTransactionRequest, StartTransactionResponse, StopTransactionReason, StopTransactionRequest, StopTransactionResponse } from '../types/ocpp/1.6/Transaction';
-import { BootNotificationResponse, ChangeConfigurationResponse, DefaultResponse, GetConfigurationResponse, HeartbeatResponse, RegistrationStatus, SetChargingProfileResponse, StatusNotificationResponse, UnlockConnectorResponse } from '../types/ocpp/1.6/RequestResponses';
-import { ChargingProfile, ChargingProfilePurposeType } from '../types/ocpp/1.6/ChargingProfile';
+// Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
+
+import { AvailabilityType, BootNotificationRequest, CachedRequest, IncomingRequest, IncomingRequestCommand, RequestCommand } from '../types/ocpp/Requests';
+import { BootNotificationResponse, RegistrationStatus } from '../types/ocpp/Responses';
 import ChargingStationConfiguration, { ConfigurationKey } from '../types/ChargingStationConfiguration';
-import ChargingStationTemplate, { PowerOutType } from '../types/ChargingStationTemplate';
-import Connectors, { Connector } from '../types/Connectors';
-import { MeterValue, MeterValueLocation, MeterValueMeasurand, MeterValuePhase, MeterValueUnit, MeterValuesRequest, MeterValuesResponse, SampledValue } from '../types/ocpp/1.6/MeterValues';
-import { PerformanceObserver, performance } from 'perf_hooks';
-import Requests, { BootNotificationRequest, ChangeConfigurationRequest, GetConfigurationRequest, HeartbeatRequest, RemoteStartTransactionRequest, RemoteStopTransactionRequest, ResetRequest, SetChargingProfileRequest, StatusNotificationRequest, UnlockConnectorRequest } from '../types/ocpp/1.6/Requests';
-import WebSocket, { MessageEvent } from 'ws';
+import ChargingStationTemplate, { CurrentType, PowerUnits, Voltage } from '../types/ChargingStationTemplate';
+import { ConnectorPhaseRotation, StandardParametersKey, SupportedFeatureProfiles, VendorDefaultParametersKey } from '../types/ocpp/Configuration';
+import { MeterValueMeasurand, MeterValuePhase } from '../types/ocpp/MeterValues';
+import { WSError, WebSocketCloseEventStatusCode } from '../types/WebSocket';
+import WebSocket, { ClientOptions, Data, OPEN } from 'ws';
 
 import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
-import { ChargePointErrorCode } from '../types/ocpp/1.6/ChargePointErrorCode';
-import { ChargePointStatus } from '../types/ocpp/1.6/ChargePointStatus';
+import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
+import { ChargingProfile } from '../types/ocpp/ChargingProfile';
 import ChargingStationInfo from '../types/ChargingStationInfo';
+import { ChargingStationWorkerMessageEvents } from '../types/ChargingStationWorker';
+import { ClientRequestArgs } from 'http';
 import Configuration from '../utils/Configuration';
+import { ConnectorStatus } from '../types/ConnectorStatus';
 import Constants from '../utils/Constants';
-import ElectricUtils from '../utils/ElectricUtils';
-import MeasurandValues from '../types/MeasurandValues';
-import OCPPError from './OcppError';
-import Statistics from '../utils/Statistics';
+import { ErrorType } from '../types/ocpp/ErrorType';
+import FileUtils from '../utils/FileUtils';
+import { MessageType } from '../types/ocpp/MessageType';
+import OCPP16IncomingRequestService from './ocpp/1.6/OCPP16IncomingRequestService';
+import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
+import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
+import OCPPError from '../exception/OCPPError';
+import OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
+import OCPPRequestService from './ocpp/OCPPRequestService';
+import { OCPPVersion } from '../types/ocpp/OCPPVersion';
+import PerformanceStatistics from '../performance/PerformanceStatistics';
+import { SampledValueTemplate } from '../types/MeasurandPerPhaseSampledValueTemplates';
+import { StopTransactionReason } from '../types/ocpp/Transaction';
+import { SupervisionUrlDistribution } from '../types/ConfigurationData';
+import { URL } from 'url';
 import Utils from '../utils/Utils';
-import { WebSocketCloseEventStatusCode } from '../types/WebSocket';
 import crypto from 'crypto';
 import fs from 'fs';
 import logger from '../utils/Logger';
+import { parentPort } from 'worker_threads';
+import path from 'path';
 
 export default class ChargingStation {
-  private _index: number;
-  private _stationTemplateFile: string;
-  private _stationInfo: ChargingStationInfo;
-  private _bootNotificationRequest: BootNotificationRequest;
-  private _bootNotificationResponse: BootNotificationResponse;
-  private _connectors: Connectors;
-  private _configuration: ChargingStationConfiguration;
-  private _connectorsConfigurationHash: string;
-  private _supervisionUrl: string;
-  private _wsConnectionUrl: string;
-  private _wsConnection: WebSocket;
-  private _hasStopped: boolean;
-  private _hasSocketRestarted: boolean;
-  private _autoReconnectRetryCount: number;
-  private _requests: Requests;
-  private _messageQueue: string[];
-  private _automaticTransactionGeneration: AutomaticTransactionGenerator;
-  private _authorizedTags: string[];
-  private _heartbeatInterval: number;
-  private _heartbeatSetInterval: NodeJS.Timeout;
-  private _webSocketPingSetInterval: NodeJS.Timeout;
-  private _statistics: Statistics;
-  private _performanceObserver: PerformanceObserver;
+  public readonly stationTemplateFile: string;
+  public authorizedTags: string[];
+  public stationInfo!: ChargingStationInfo;
+  public readonly connectors: Map<number, ConnectorStatus>;
+  public configuration!: ChargingStationConfiguration;
+  public wsConnection!: WebSocket;
+  public readonly requests: Map<string, CachedRequest>;
+  public performanceStatistics!: PerformanceStatistics;
+  public heartbeatSetInterval!: NodeJS.Timeout;
+  public ocppRequestService!: OCPPRequestService;
+  private readonly index: number;
+  private bootNotificationRequest!: BootNotificationRequest;
+  private bootNotificationResponse!: BootNotificationResponse | null;
+  private connectorsConfigurationHash!: string;
+  private ocppIncomingRequestService!: OCPPIncomingRequestService;
+  private readonly messageBuffer: Set<string>;
+  private wsConfiguredConnectionUrl!: URL;
+  private wsConnectionRestarted: boolean;
+  private stopped: boolean;
+  private autoReconnectRetryCount: number;
+  private automaticTransactionGenerator!: AutomaticTransactionGenerator;
+  private webSocketPingSetInterval!: NodeJS.Timeout;
 
   constructor(index: number, stationTemplateFile: string) {
-    this._index = index;
-    this._stationTemplateFile = stationTemplateFile;
-    this._connectors = {} as Connectors;
-    this._initialize();
+    this.index = index;
+    this.stationTemplateFile = stationTemplateFile;
+    this.connectors = new Map<number, ConnectorStatus>();
+    this.initialize();
 
-    this._hasStopped = false;
-    this._hasSocketRestarted = false;
-    this._autoReconnectRetryCount = 0;
+    this.stopped = false;
+    this.wsConnectionRestarted = false;
+    this.autoReconnectRetryCount = 0;
 
-    this._requests = {} as Requests;
-    this._messageQueue = [] as string[];
+    this.requests = new Map<string, CachedRequest>();
+    this.messageBuffer = new Set<string>();
 
-    this._authorizedTags = this._loadAndGetAuthorizedTags();
+    this.authorizedTags = this.getAuthorizedTags();
   }
 
-  _getStationName(stationTemplate: ChargingStationTemplate): string {
-    return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + this._index.toString()).substr(('000000000' + this._index.toString()).length - 4);
+  get wsConnectionUrl(): URL {
+    return this.getSupervisionUrlOcppConfiguration() ? new URL(this.getConfigurationKey(this.stationInfo.supervisionUrlOcppKey ?? VendorDefaultParametersKey.ConnectionUrl).value + '/' + this.stationInfo.chargingStationId) : this.wsConfiguredConnectionUrl;
   }
 
-  _buildStationInfo(): ChargingStationInfo {
-    let stationTemplateFromFile: ChargingStationTemplate;
-    try {
-      // Load template file
-      const fileDescriptor = fs.openSync(this._stationTemplateFile, 'r');
-      stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
-      fs.closeSync(fileDescriptor);
-    } catch (error) {
-      logger.error('Template file ' + this._stationTemplateFile + ' loading error: %j', error);
-      throw error;
-    }
-    const stationInfo: ChargingStationInfo = stationTemplateFromFile || {} as ChargingStationInfo;
-    if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
-      stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
-      stationInfo.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
-    } else {
-      stationInfo.maxPower = stationTemplateFromFile.power as number;
-    }
-    stationInfo.name = this._getStationName(stationTemplateFromFile);
-    stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
-    return stationInfo;
+  public logPrefix(): string {
+    return Utils.logPrefix(` ${this.stationInfo.chargingStationId} |`);
   }
 
-  get stationInfo(): ChargingStationInfo {
-    return this._stationInfo;
+  public getBootNotificationRequest(): BootNotificationRequest {
+    return this.bootNotificationRequest;
   }
 
-  _initialize(): void {
-    this._stationInfo = this._buildStationInfo();
-    this._bootNotificationRequest = {
-      chargePointModel: this._stationInfo.chargePointModel,
-      chargePointVendor: this._stationInfo.chargePointVendor,
-      ...!Utils.isUndefined(this._stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this._stationInfo.chargeBoxSerialNumberPrefix },
-      ...!Utils.isUndefined(this._stationInfo.firmwareVersion) && { firmwareVersion: this._stationInfo.firmwareVersion },
-    };
-    this._configuration = this._getTemplateChargingStationConfiguration();
-    this._supervisionUrl = this._getSupervisionURL();
-    this._wsConnectionUrl = this._supervisionUrl + '/' + this._stationInfo.name;
-    // Build connectors if needed
-    const maxConnectors = this._getMaxNumberOfConnectors();
-    if (maxConnectors <= 0) {
-      logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with ${maxConnectors} connectors`);
-    }
-    const templateMaxConnectors = this._getTemplateMaxNumberOfConnectors();
-    if (templateMaxConnectors <= 0) {
-      logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with no connector configuration`);
-    }
-    if (!this._stationInfo.Connectors[0]) {
-      logger.warn(`${this._logPrefix()} Charging station template ${this._stationTemplateFile} with no connector Id 0 configuration`);
-    }
-    // Sanity check
-    if (maxConnectors > (this._stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this._stationInfo.randomConnectors) {
-      logger.warn(`${this._logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this._stationTemplateFile}, forcing random connector configurations affectation`);
-      this._stationInfo.randomConnectors = true;
-    }
-    const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this._stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
-    // FIXME: Handle shrinking the number of connectors
-    if (!this._connectors || (this._connectors && this._connectorsConfigurationHash !== connectorsConfigHash)) {
-      this._connectorsConfigurationHash = connectorsConfigHash;
-      // Add connector Id 0
-      let lastConnector = '0';
-      for (lastConnector in this._stationInfo.Connectors) {
-        if (Utils.convertToInt(lastConnector) === 0 && this._getUseConnectorId0() && this._stationInfo.Connectors[lastConnector]) {
-          this._connectors[lastConnector] = Utils.cloneObject<Connector>(this._stationInfo.Connectors[lastConnector]);
-        }
-      }
-      // Generate all connectors
-      if ((this._stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
-        for (let index = 1; index <= maxConnectors; index++) {
-          const randConnectorID = this._stationInfo.randomConnectors ? Utils.getRandomInt(Utils.convertToInt(lastConnector), 1) : index;
-          this._connectors[index] = Utils.cloneObject<Connector>(this._stationInfo.Connectors[randConnectorID]);
-        }
-      }
-    }
-    // Avoid duplication of connectors related information
-    delete this._stationInfo.Connectors;
-    // Initialize transaction attributes on connectors
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && !this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
-        this._initTransactionOnConnector(Utils.convertToInt(connector));
-      }
-    }
-    // OCPP parameters
-    this._addConfigurationKey('NumberOfConnectors', this._getNumberOfConnectors().toString(), true);
-    if (!this._getConfigurationKey('MeterValuesSampledData')) {
-      this._addConfigurationKey('MeterValuesSampledData', MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
-    }
-    this._stationInfo.powerDivider = this._getPowerDivider();
-    if (this.getEnableStatistics()) {
-      this._statistics = Statistics.getInstance();
-      this._statistics.objName = this._stationInfo.name;
-      this._performanceObserver = new PerformanceObserver((list) => {
-        const entry = list.getEntries()[0];
-        this._statistics.logPerformance(entry, Constants.ENTITY_CHARGING_STATION);
-        this._performanceObserver.disconnect();
-      });
-    }
+  public getRandomIdTag(): string {
+    const index = Math.floor(Utils.secureRandom() * this.authorizedTags.length);
+    return this.authorizedTags[index];
   }
 
-  get connectors(): Connectors {
-    return this._connectors;
+  public hasAuthorizedTags(): boolean {
+    return !Utils.isEmptyArray(this.authorizedTags);
   }
 
-  get statistics(): Statistics {
-    return this._statistics;
+  public getEnableStatistics(): boolean | undefined {
+    return !Utils.isUndefined(this.stationInfo.enableStatistics) ? this.stationInfo.enableStatistics : true;
   }
 
-  _logPrefix(): string {
-    return Utils.logPrefix(` ${this._stationInfo.name}:`);
+  public getMayAuthorizeAtRemoteStart(): boolean | undefined {
+    return this.stationInfo.mayAuthorizeAtRemoteStart ?? true;
   }
 
-  _isWebSocketOpen(): boolean {
-    return this._wsConnection?.readyState === WebSocket.OPEN;
+  public getNumberOfPhases(): number | undefined {
+    switch (this.getCurrentOutType()) {
+      case CurrentType.AC:
+        return !Utils.isUndefined(this.stationInfo.numberOfPhases) ? this.stationInfo.numberOfPhases : 3;
+      case CurrentType.DC:
+        return 0;
+    }
   }
 
-  _isRegistered(): boolean {
-    return this._bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
+  public isWebSocketConnectionOpened(): boolean {
+    return this?.wsConnection?.readyState === OPEN;
   }
 
-  _getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
-    return this._stationInfo.Configuration ? this._stationInfo.Configuration : {} as ChargingStationConfiguration;
+  public isInPendingState(): boolean {
+    return this?.bootNotificationResponse?.status === RegistrationStatus.PENDING;
   }
 
-  _getAuthorizationFile(): string {
-    return this._stationInfo.authorizationFile && this._stationInfo.authorizationFile;
+  public isInAcceptedState(): boolean {
+    return this?.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
   }
 
-  _getUseConnectorId0(): boolean {
-    return !Utils.isUndefined(this._stationInfo.useConnectorId0) ? this._stationInfo.useConnectorId0 : true;
+  public isInRejectedState(): boolean {
+    return this?.bootNotificationResponse?.status === RegistrationStatus.REJECTED;
   }
 
-  _loadAndGetAuthorizedTags(): string[] {
-    let authorizedTags: string[] = [];
-    const authorizationFile = this._getAuthorizationFile();
-    if (authorizationFile) {
-      try {
-        // Load authorization file
-        const fileDescriptor = fs.openSync(authorizationFile, 'r');
-        authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
-        fs.closeSync(fileDescriptor);
-      } catch (error) {
-        logger.error(this._logPrefix() + ' Authorization file ' + authorizationFile + ' loading error: %j', error);
-        throw error;
-      }
-    } else {
-      logger.info(this._logPrefix() + ' No authorization file given in template file ' + this._stationTemplateFile);
-    }
-    return authorizedTags;
+  public isRegistered(): boolean {
+    return this.isInAcceptedState() || this.isInPendingState();
   }
 
-  getRandomTagId(): string {
-    const index = Math.floor(Math.random() * this._authorizedTags.length);
-    return this._authorizedTags[index];
+  public isChargingStationAvailable(): boolean {
+    return this.getConnectorStatus(0).availability === AvailabilityType.OPERATIVE;
   }
 
-  hasAuthorizedTags(): boolean {
-    return !Utils.isEmptyArray(this._authorizedTags);
+  public isConnectorAvailable(id: number): boolean {
+    return this.getConnectorStatus(id).availability === AvailabilityType.OPERATIVE;
   }
 
-  getEnableStatistics(): boolean {
-    return !Utils.isUndefined(this._stationInfo.enableStatistics) ? this._stationInfo.enableStatistics : true;
+  public getNumberOfConnectors(): number {
+    return this.connectors.get(0) ? this.connectors.size - 1 : this.connectors.size;
   }
 
-  _getNumberOfPhases(): number {
-    switch (this._getPowerOutType()) {
-      case PowerOutType.AC:
-        return !Utils.isUndefined(this._stationInfo.numberOfPhases) ? this._stationInfo.numberOfPhases : 3;
-      case PowerOutType.DC:
-        return 0;
-    }
+  public getConnectorStatus(id: number): ConnectorStatus {
+    return this.connectors.get(id);
   }
 
-  _getNumberOfRunningTransactions(): number {
-    let trxCount = 0;
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
-        trxCount++;
-      }
-    }
-    return trxCount;
+  public getCurrentOutType(): CurrentType | undefined {
+    return this.stationInfo.currentOutType ?? CurrentType.AC;
   }
 
-  // 0 for disabling
-  _getConnectionTimeout(): number {
-    if (!Utils.isUndefined(this._stationInfo.connectionTimeout)) {
-      return this._stationInfo.connectionTimeout;
-    }
-    if (!Utils.isUndefined(Configuration.getConnectionTimeout())) {
-      return Configuration.getConnectionTimeout();
+  public getVoltageOut(): number | undefined {
+    const errMsg = `${this.logPrefix()} Unknown ${this.getCurrentOutType()} currentOutType in template file ${this.stationTemplateFile}, cannot define default voltage out`;
+    let defaultVoltageOut: number;
+    switch (this.getCurrentOutType()) {
+      case CurrentType.AC:
+        defaultVoltageOut = Voltage.VOLTAGE_230;
+        break;
+      case CurrentType.DC:
+        defaultVoltageOut = Voltage.VOLTAGE_400;
+        break;
+      default:
+        logger.error(errMsg);
+        throw new Error(errMsg);
     }
-    return 30;
+    return !Utils.isUndefined(this.stationInfo.voltageOut) ? this.stationInfo.voltageOut : defaultVoltageOut;
   }
 
-  // -1 for unlimited, 0 for disabling
-  _getAutoReconnectMaxRetries(): number {
-    if (!Utils.isUndefined(this._stationInfo.autoReconnectMaxRetries)) {
-      return this._stationInfo.autoReconnectMaxRetries;
-    }
-    if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
-      return Configuration.getAutoReconnectMaxRetries();
+  public getTransactionIdTag(transactionId: number): string | undefined {
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
+        return this.getConnectorStatus(connectorId).transactionIdTag;
+      }
     }
-    return -1;
   }
 
-  _getRegistrationMaxRetries(): number {
-    if (!Utils.isUndefined(this._stationInfo.registrationMaxRetries)) {
-      return this._stationInfo.registrationMaxRetries;
-    }
-    return -1;
+  public getOutOfOrderEndMeterValues(): boolean {
+    return this.stationInfo.outOfOrderEndMeterValues ?? false;
   }
 
-  _getPowerDivider(): number {
-    let powerDivider = this._getNumberOfConnectors();
-    if (this._stationInfo.powerSharedByConnectors) {
-      powerDivider = this._getNumberOfRunningTransactions();
-    }
-    return powerDivider;
+  public getBeginEndMeterValues(): boolean {
+    return this.stationInfo.beginEndMeterValues ?? false;
   }
 
-  getConnector(id: number): Connector {
-    return this._connectors[id];
+  public getMeteringPerTransaction(): boolean {
+    return this.stationInfo.meteringPerTransaction ?? true;
   }
 
-  _getTemplateMaxNumberOfConnectors(): number {
-    return Object.keys(this._stationInfo.Connectors).length;
+  public getTransactionDataMeterValues(): boolean {
+    return this.stationInfo.transactionDataMeterValues ?? false;
   }
 
-  _getMaxNumberOfConnectors(): number {
-    let maxConnectors = 0;
-    if (!Utils.isEmptyArray(this._stationInfo.numberOfConnectors)) {
-      const numberOfConnectors = this._stationInfo.numberOfConnectors as number[];
-      // Distribute evenly the number of connectors
-      maxConnectors = numberOfConnectors[(this._index - 1) % numberOfConnectors.length];
-    } else if (!Utils.isUndefined(this._stationInfo.numberOfConnectors)) {
-      maxConnectors = this._stationInfo.numberOfConnectors as number;
-    } else {
-      maxConnectors = this._stationInfo.Connectors[0] ? this._getTemplateMaxNumberOfConnectors() - 1 : this._getTemplateMaxNumberOfConnectors();
-    }
-    return maxConnectors;
+  public getMainVoltageMeterValues(): boolean {
+    return this.stationInfo.mainVoltageMeterValues ?? true;
   }
 
-  _getNumberOfConnectors(): number {
-    return this._connectors[0] ? Object.keys(this._connectors).length - 1 : Object.keys(this._connectors).length;
+  public getPhaseLineToLineVoltageMeterValues(): boolean {
+    return this.stationInfo.phaseLineToLineVoltageMeterValues ?? false;
   }
 
-  _getVoltageOut(): number {
-    const errMsg = `${this._logPrefix()} Unknown ${this._getPowerOutType()} powerOutType in template file ${this._stationTemplateFile}, cannot define default voltage out`;
-    let defaultVoltageOut: number;
-    switch (this._getPowerOutType()) {
-      case PowerOutType.AC:
-        defaultVoltageOut = 230;
-        break;
-      case PowerOutType.DC:
-        defaultVoltageOut = 400;
-        break;
-      default:
-        logger.error(errMsg);
-        throw Error(errMsg);
+  public getEnergyActiveImportRegisterByTransactionId(transactionId: number): number | undefined {
+    if (this.getMeteringPerTransaction()) {
+      for (const connectorId of this.connectors.keys()) {
+        if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
+          return this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue;
+        }
+      }
     }
-    return !Utils.isUndefined(this._stationInfo.voltageOut) ? this._stationInfo.voltageOut : defaultVoltageOut;
-  }
-
-  _getTransactionIdTag(transactionId: number): string {
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
-        return this.getConnector(Utils.convertToInt(connector)).idTag;
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionId === transactionId) {
+        return this.getConnectorStatus(connectorId).energyActiveImportRegisterValue;
       }
     }
   }
 
-  _getTransactionMeterStop(transactionId: number): number {
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
-        return this.getConnector(Utils.convertToInt(connector)).lastEnergyActiveImportRegisterValue;
-      }
+  public getEnergyActiveImportRegisterByConnectorId(connectorId: number): number | undefined {
+    if (this.getMeteringPerTransaction()) {
+      return this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue;
     }
+    return this.getConnectorStatus(connectorId).energyActiveImportRegisterValue;
   }
 
-  _getPowerOutType(): PowerOutType {
-    return !Utils.isUndefined(this._stationInfo.powerOutType) ? this._stationInfo.powerOutType : PowerOutType.AC;
+  public getAuthorizeRemoteTxRequests(): boolean {
+    const authorizeRemoteTxRequests = this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests);
+    return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
   }
 
-  _getSupervisionURL(): string {
-    const supervisionUrls = Utils.cloneObject<string | string[]>(this._stationInfo.supervisionURL ? this._stationInfo.supervisionURL : Configuration.getSupervisionURLs());
-    let indexUrl = 0;
-    if (!Utils.isEmptyArray(supervisionUrls)) {
-      if (Configuration.getDistributeStationsToTenantsEqually()) {
-        indexUrl = this._index % supervisionUrls.length;
-      } else {
-        // Get a random url
-        indexUrl = Math.floor(Math.random() * supervisionUrls.length);
+  public getLocalAuthListEnabled(): boolean {
+    const localAuthListEnabled = this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled);
+    return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
+  }
+
+  public restartWebSocketPing(): void {
+    // Stop WebSocket ping
+    this.stopWebSocketPing();
+    // Start WebSocket ping
+    this.startWebSocketPing();
+  }
+
+  public getSampledValueTemplate(connectorId: number, measurand: MeterValueMeasurand = MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER,
+      phase?: MeterValuePhase): SampledValueTemplate | undefined {
+    if (!Constants.SUPPORTED_MEASURANDS.includes(measurand)) {
+      logger.warn(`${this.logPrefix()} Trying to get unsupported MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
+      return;
+    }
+    if (measurand !== MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER && !this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
+      logger.debug(`${this.logPrefix()} Trying to get MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId} not found in '${StandardParametersKey.MeterValuesSampledData}' OCPP parameter`);
+      return;
+    }
+    const sampledValueTemplates: SampledValueTemplate[] = this.getConnectorStatus(connectorId).MeterValues;
+    for (let index = 0; !Utils.isEmptyArray(sampledValueTemplates) && index < sampledValueTemplates.length; index++) {
+      if (!Constants.SUPPORTED_MEASURANDS.includes(sampledValueTemplates[index]?.measurand ?? MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER)) {
+        logger.warn(`${this.logPrefix()} Unsupported MeterValues measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
+      } else if (phase && sampledValueTemplates[index]?.phase === phase && sampledValueTemplates[index]?.measurand === measurand
+        && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
+        return sampledValueTemplates[index];
+      } else if (!phase && !sampledValueTemplates[index].phase && sampledValueTemplates[index]?.measurand === measurand
+        && this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData).value.includes(measurand)) {
+        return sampledValueTemplates[index];
+      } else if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER
+        && (!sampledValueTemplates[index].measurand || sampledValueTemplates[index].measurand === measurand)) {
+        return sampledValueTemplates[index];
       }
-      return supervisionUrls[indexUrl];
     }
-    return supervisionUrls as string;
+    if (measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
+      const errorMsg = `${this.logPrefix()} Missing MeterValues for default measurand '${measurand}' in template on connectorId ${connectorId}`;
+      logger.error(errorMsg);
+      throw new Error(errorMsg);
+    }
+    logger.debug(`${this.logPrefix()} No MeterValues for measurand '${measurand}' ${phase ? `on phase ${phase} ` : ''}in template on connectorId ${connectorId}`);
   }
 
-  _getReconnectExponentialDelay(): boolean {
-    return !Utils.isUndefined(this._stationInfo.reconnectExponentialDelay) ? this._stationInfo.reconnectExponentialDelay : false;
+  public getAutomaticTransactionGeneratorRequireAuthorize(): boolean {
+    return this.stationInfo.AutomaticTransactionGenerator.requireAuthorize ?? true;
   }
 
-  _getAuthorizeRemoteTxRequests(): boolean {
-    const authorizeRemoteTxRequests = this._getConfigurationKey('AuthorizeRemoteTxRequests');
-    return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
+  public startHeartbeat(): void {
+    if (this.getHeartbeatInterval() && this.getHeartbeatInterval() > 0 && !this.heartbeatSetInterval) {
+      // eslint-disable-next-line @typescript-eslint/no-misused-promises
+      this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
+        await this.ocppRequestService.sendHeartbeat();
+      }, this.getHeartbeatInterval());
+      logger.info(this.logPrefix() + ' Heartbeat started every ' + Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()));
+    } else if (this.heartbeatSetInterval) {
+      logger.info(this.logPrefix() + ' Heartbeat already started every ' + Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()));
+    } else {
+      logger.error(`${this.logPrefix()} Heartbeat interval set to ${this.getHeartbeatInterval() ? Utils.formatDurationMilliSeconds(this.getHeartbeatInterval()) : this.getHeartbeatInterval()}, not starting the heartbeat`);
+    }
   }
 
-  _getLocalAuthListEnabled(): boolean {
-    const localAuthListEnabled = this._getConfigurationKey('LocalAuthListEnabled');
-    return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
+  public restartHeartbeat(): void {
+    // Stop heartbeat
+    this.stopHeartbeat();
+    // Start heartbeat
+    this.startHeartbeat();
   }
 
-  async _startMessageSequence(): Promise<void> {
-    // Start WebSocket ping
-    this._startWebSocketPing();
-    // Start heartbeat
-    this._startHeartbeat();
-    // Initialize connectors status
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) === 0) {
-        continue;
-      } else if (!this._hasStopped && !this.getConnector(Utils.convertToInt(connector)).status && this.getConnector(Utils.convertToInt(connector)).bootStatus) {
-        // Send status in template at startup
-        await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
-      } else if (this._hasStopped && this.getConnector(Utils.convertToInt(connector)).bootStatus) {
-        // Send status in template after reset
-        await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).bootStatus);
-      } else if (!this._hasStopped && this.getConnector(Utils.convertToInt(connector)).status) {
-        // Send previous status at template reload
-        await this.sendStatusNotification(Utils.convertToInt(connector), this.getConnector(Utils.convertToInt(connector)).status);
-      } else {
-        // Send default status
-        await this.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.AVAILABLE);
-      }
+  public startMeterValues(connectorId: number, interval: number): void {
+    if (connectorId === 0) {
+      logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId.toString()}`);
+      return;
     }
-    // Start the ATG
-    if (this._stationInfo.AutomaticTransactionGenerator.enable) {
-      if (!this._automaticTransactionGeneration) {
-        this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
-      }
-      if (this._automaticTransactionGeneration.timeToStop) {
-        this._automaticTransactionGeneration.start();
+    if (!this.getConnectorStatus(connectorId)) {
+      logger.error(`${this.logPrefix()} Trying to start MeterValues on non existing connector Id ${connectorId.toString()}`);
+      return;
+    }
+    if (!this.getConnectorStatus(connectorId)?.transactionStarted) {
+      logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
+      return;
+    } else if (this.getConnectorStatus(connectorId)?.transactionStarted && !this.getConnectorStatus(connectorId)?.transactionId) {
+      logger.error(`${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
+      return;
+    }
+    if (interval > 0) {
+      // eslint-disable-next-line @typescript-eslint/no-misused-promises
+      this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(async (): Promise<void> => {
+        await this.ocppRequestService.sendMeterValues(connectorId, this.getConnectorStatus(connectorId).transactionId, interval);
+      }, interval);
+    } else {
+      logger.error(`${this.logPrefix()} Charging station ${StandardParametersKey.MeterValueSampleInterval} configuration set to ${interval ? Utils.formatDurationMilliSeconds(interval) : interval}, not sending MeterValues`);
+    }
+  }
+
+  public start(): void {
+    if (this.getEnableStatistics()) {
+      this.performanceStatistics.start();
+    }
+    this.openWSConnection();
+    // Monitor authorization file
+    this.startAuthorizationFileMonitoring();
+    // Monitor station template file
+    this.startStationTemplateFileMonitoring();
+    // Handle WebSocket message
+    this.wsConnection.on('message', this.onMessage.bind(this));
+    // Handle WebSocket error
+    this.wsConnection.on('error', this.onError.bind(this));
+    // Handle WebSocket close
+    this.wsConnection.on('close', this.onClose.bind(this));
+    // Handle WebSocket open
+    this.wsConnection.on('open', this.onOpen.bind(this));
+    // Handle WebSocket ping
+    this.wsConnection.on('ping', this.onPing.bind(this));
+    // Handle WebSocket pong
+    this.wsConnection.on('pong', this.onPong.bind(this));
+    parentPort.postMessage({ id: ChargingStationWorkerMessageEvents.STARTED, data: { id: this.stationInfo.chargingStationId } });
+  }
+
+  public async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
+    // Stop message sequence
+    await this.stopMessageSequence(reason);
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0) {
+        await this.ocppRequestService.sendStatusNotification(connectorId, ChargePointStatus.UNAVAILABLE);
+        this.getConnectorStatus(connectorId).status = ChargePointStatus.UNAVAILABLE;
       }
     }
+    if (this.isWebSocketConnectionOpened()) {
+      this.wsConnection.close();
+    }
     if (this.getEnableStatistics()) {
-      this._statistics.start();
+      this.performanceStatistics.stop();
     }
+    this.bootNotificationResponse = null;
+    parentPort.postMessage({ id: ChargingStationWorkerMessageEvents.STOPPED, data: { id: this.stationInfo.chargingStationId } });
+    this.stopped = true;
   }
 
-  async _stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
-    // Stop WebSocket ping
-    this._stopWebSocketPing();
-    // Stop heartbeat
-    this._stopHeartbeat();
-    // Stop the ATG
-    if (this._stationInfo.AutomaticTransactionGenerator.enable &&
-      this._automaticTransactionGeneration &&
-      !this._automaticTransactionGeneration.timeToStop) {
-      await this._automaticTransactionGeneration.stop(reason);
-    } else {
-      for (const connector in this._connectors) {
-        if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionStarted) {
-          await this.sendStopTransaction(this.getConnector(Utils.convertToInt(connector)).transactionId, reason);
-        }
+  public getConfigurationKey(key: string | StandardParametersKey, caseInsensitive = false): ConfigurationKey | undefined {
+    return this.configuration.configurationKey.find((configElement) => {
+      if (caseInsensitive) {
+        return configElement.key.toLowerCase() === key.toLowerCase();
       }
+      return configElement.key === key;
+    });
+  }
+
+  public addConfigurationKey(key: string | StandardParametersKey, value: string, options: { readonly?: boolean, visible?: boolean, reboot?: boolean } = { readonly: false, visible: true, reboot: false }): void {
+    const keyFound = this.getConfigurationKey(key);
+    const readonly = options.readonly;
+    const visible = options.visible;
+    const reboot = options.reboot;
+    if (!keyFound) {
+      this.configuration.configurationKey.push({
+        key,
+        readonly,
+        value,
+        visible,
+        reboot,
+      });
+    } else {
+      logger.error(`${this.logPrefix()} Trying to add an already existing configuration key: %j`, keyFound);
     }
   }
 
-  _startWebSocketPing(): void {
-    const webSocketPingInterval: number = this._getConfigurationKey('WebSocketPingInterval') ? Utils.convertToInt(this._getConfigurationKey('WebSocketPingInterval').value) : 0;
-    if (webSocketPingInterval > 0 && !this._webSocketPingSetInterval) {
-      this._webSocketPingSetInterval = setInterval(() => {
-        if (this._isWebSocketOpen()) {
-          this._wsConnection.ping((): void => { });
-        }
-      }, webSocketPingInterval * 1000);
-      logger.info(this._logPrefix() + ' WebSocket ping started every ' + Utils.secondsToHHMMSS(webSocketPingInterval));
-    } else if (this._webSocketPingSetInterval) {
-      logger.info(this._logPrefix() + ' WebSocket ping every ' + Utils.secondsToHHMMSS(webSocketPingInterval) + ' already started');
+  public setConfigurationKeyValue(key: string | StandardParametersKey, value: string): void {
+    const keyFound = this.getConfigurationKey(key);
+    if (keyFound) {
+      const keyIndex = this.configuration.configurationKey.indexOf(keyFound);
+      this.configuration.configurationKey[keyIndex].value = value;
     } else {
-      logger.error(`${this._logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.secondsToHHMMSS(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
+      logger.error(`${this.logPrefix()} Trying to set a value on a non existing configuration key: %j`, { key, value });
     }
   }
 
-  _stopWebSocketPing(): void {
-    if (this._webSocketPingSetInterval) {
-      clearInterval(this._webSocketPingSetInterval);
-      this._webSocketPingSetInterval = null;
+  public setChargingProfile(connectorId: number, cp: ChargingProfile): void {
+    let cpReplaced = false;
+    if (!Utils.isEmptyArray(this.getConnectorStatus(connectorId).chargingProfiles)) {
+      this.getConnectorStatus(connectorId).chargingProfiles?.forEach((chargingProfile: ChargingProfile, index: number) => {
+        if (chargingProfile.chargingProfileId === cp.chargingProfileId
+          || (chargingProfile.stackLevel === cp.stackLevel && chargingProfile.chargingProfilePurpose === cp.chargingProfilePurpose)) {
+          this.getConnectorStatus(connectorId).chargingProfiles[index] = cp;
+          cpReplaced = true;
+        }
+      });
     }
+    !cpReplaced && this.getConnectorStatus(connectorId).chargingProfiles?.push(cp);
   }
 
-  _restartWebSocketPing(): void {
-    // Stop WebSocket ping
-    this._stopWebSocketPing();
-    // Start WebSocket ping
-    this._startWebSocketPing();
+  public resetConnectorStatus(connectorId: number): void {
+    this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
+    this.getConnectorStatus(connectorId).idTagAuthorized = false;
+    this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
+    this.getConnectorStatus(connectorId).transactionStarted = false;
+    delete this.getConnectorStatus(connectorId).localAuthorizeIdTag;
+    delete this.getConnectorStatus(connectorId).authorizeIdTag;
+    delete this.getConnectorStatus(connectorId).transactionId;
+    delete this.getConnectorStatus(connectorId).transactionIdTag;
+    this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
+    delete this.getConnectorStatus(connectorId).transactionBeginMeterValue;
+    this.stopMeterValues(connectorId);
   }
 
-  _startHeartbeat(): void {
-    if (this._heartbeatInterval && this._heartbeatInterval > 0 && !this._heartbeatSetInterval) {
-      this._heartbeatSetInterval = setInterval(async () => {
-        await this.sendHeartbeat();
-      }, this._heartbeatInterval);
-      logger.info(this._logPrefix() + ' Heartbeat started every ' + Utils.milliSecondsToHHMMSS(this._heartbeatInterval));
-    } else if (this._heartbeatSetInterval) {
-      logger.info(this._logPrefix() + ' Heartbeat every ' + Utils.milliSecondsToHHMMSS(this._heartbeatInterval) + ' already started');
-    } else {
-      logger.error(`${this._logPrefix()} Heartbeat interval set to ${this._heartbeatInterval ? Utils.milliSecondsToHHMMSS(this._heartbeatInterval) : this._heartbeatInterval}, not starting the heartbeat`);
-    }
+  public bufferMessage(message: string): void {
+    this.messageBuffer.add(message);
   }
 
-  _stopHeartbeat(): void {
-    if (this._heartbeatSetInterval) {
-      clearInterval(this._heartbeatSetInterval);
-      this._heartbeatSetInterval = null;
+  private flushMessageBuffer() {
+    if (this.messageBuffer.size > 0) {
+      this.messageBuffer.forEach((message) => {
+        // TODO: evaluate the need to track performance
+        this.wsConnection.send(message);
+        this.messageBuffer.delete(message);
+      });
     }
   }
 
-  _restartHeartbeat(): void {
-    // Stop heartbeat
-    this._stopHeartbeat();
-    // Start heartbeat
-    this._startHeartbeat();
+  private getSupervisionUrlOcppConfiguration(): boolean {
+    return this.stationInfo.supervisionUrlOcppConfiguration ?? false;
   }
 
-  _startAuthorizationFileMonitoring(): void {
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    fs.watchFile(this._getAuthorizationFile(), (current, previous) => {
-      try {
-        logger.debug(this._logPrefix() + ' Authorization file ' + this._getAuthorizationFile() + ' have changed, reload');
-        // Initialize _authorizedTags
-        this._authorizedTags = this._loadAndGetAuthorizedTags();
-      } catch (error) {
-        logger.error(this._logPrefix() + ' Authorization file monitoring error: %j', error);
-      }
-    });
+  private getChargingStationId(stationTemplate: ChargingStationTemplate): string {
+    // In case of multiple instances: add instance index to charging station id
+    const instanceIndex = process.env.CF_INSTANCE_INDEX ?? 0;
+    const idSuffix = stationTemplate.nameSuffix ?? '';
+    return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + instanceIndex.toString() + ('000000000' + this.index.toString()).substr(('000000000' + this.index.toString()).length - 4) + idSuffix;
   }
 
-  _startStationTemplateFileMonitoring(): void {
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-    fs.watchFile(this._stationTemplateFile, (current, previous) => {
-      try {
-        logger.debug(this._logPrefix() + ' Template file ' + this._stationTemplateFile + ' have changed, reload');
-        // Initialize
-        this._initialize();
-        if (!this._stationInfo.AutomaticTransactionGenerator.enable &&
-          this._automaticTransactionGeneration) {
-          this._automaticTransactionGeneration.stop().catch(() => { });
-        }
-        // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
-      } catch (error) {
-        logger.error(this._logPrefix() + ' Charging station template file monitoring error: %j', error);
-      }
-    });
+  private buildStationInfo(): ChargingStationInfo {
+    let stationTemplateFromFile: ChargingStationTemplate;
+    try {
+      // Load template file
+      const fileDescriptor = fs.openSync(this.stationTemplateFile, 'r');
+      stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as ChargingStationTemplate;
+      fs.closeSync(fileDescriptor);
+    } catch (error) {
+      FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error as NodeJS.ErrnoException);
+    }
+    const chargingStationId = this.getChargingStationId(stationTemplateFromFile);
+    // Deprecation template keys section
+    this.warnDeprecatedTemplateKey(stationTemplateFromFile, 'supervisionUrl', chargingStationId, 'Use \'supervisionUrls\' instead');
+    this.convertDeprecatedTemplateKey(stationTemplateFromFile, 'supervisionUrl', 'supervisionUrls');
+    const stationInfo: ChargingStationInfo = stationTemplateFromFile ?? {} as ChargingStationInfo;
+    stationInfo.wsOptions = stationTemplateFromFile?.wsOptions ?? {};
+    if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
+      stationTemplateFromFile.power = stationTemplateFromFile.power as number[];
+      const powerArrayRandomIndex = Math.floor(Utils.secureRandom() * stationTemplateFromFile.power.length);
+      stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
+        ? stationTemplateFromFile.power[powerArrayRandomIndex] * 1000
+        : stationTemplateFromFile.power[powerArrayRandomIndex];
+    } else {
+      stationTemplateFromFile.power = stationTemplateFromFile.power as number;
+      stationInfo.maxPower = stationTemplateFromFile.powerUnit === PowerUnits.KILO_WATT
+        ? stationTemplateFromFile.power * 1000
+        : stationTemplateFromFile.power;
+    }
+    delete stationInfo.power;
+    delete stationInfo.powerUnit;
+    stationInfo.chargingStationId = chargingStationId;
+    stationInfo.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
+    return stationInfo;
   }
 
-  _startMeterValues(connectorId: number, interval: number): void {
-    if (!this.getConnector(connectorId).transactionStarted) {
-      logger.error(`${this._logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`);
-      return;
-    } else if (this.getConnector(connectorId).transactionStarted && !this.getConnector(connectorId).transactionId) {
-      logger.error(`${this._logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction id`);
-      return;
+  private getOcppVersion(): OCPPVersion {
+    return this.stationInfo.ocppVersion ? this.stationInfo.ocppVersion : OCPPVersion.VERSION_16;
+  }
+
+  private handleUnsupportedVersion(version: OCPPVersion) {
+    const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${this.stationTemplateFile}`;
+    logger.error(errMsg);
+    throw new Error(errMsg);
+  }
+
+  private initialize(): void {
+    this.stationInfo = this.buildStationInfo();
+    this.configuration = this.getTemplateChargingStationConfiguration();
+    delete this.stationInfo.Configuration;
+    this.bootNotificationRequest = {
+      chargePointModel: this.stationInfo.chargePointModel,
+      chargePointVendor: this.stationInfo.chargePointVendor,
+      ...!Utils.isUndefined(this.stationInfo.chargeBoxSerialNumberPrefix) && { chargeBoxSerialNumber: this.stationInfo.chargeBoxSerialNumberPrefix },
+      ...!Utils.isUndefined(this.stationInfo.firmwareVersion) && { firmwareVersion: this.stationInfo.firmwareVersion },
+    };
+    // Build connectors if needed
+    const maxConnectors = this.getMaxNumberOfConnectors();
+    if (maxConnectors <= 0) {
+      logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with ${maxConnectors} connectors`);
     }
-    if (interval > 0) {
-      this.getConnector(connectorId).transactionSetInterval = setInterval(async () => {
-        if (this.getEnableStatistics()) {
-          const sendMeterValues = performance.timerify(this.sendMeterValues);
-          this._performanceObserver.observe({
-            entryTypes: ['function'],
-          });
-          await sendMeterValues(connectorId, interval, this);
-        } else {
-          await this.sendMeterValues(connectorId, interval, this);
+    const templateMaxConnectors = this.getTemplateMaxNumberOfConnectors();
+    if (templateMaxConnectors <= 0) {
+      logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector configuration`);
+    }
+    if (!this.stationInfo.Connectors[0]) {
+      logger.warn(`${this.logPrefix()} Charging station template ${this.stationTemplateFile} with no connector Id 0 configuration`);
+    }
+    // Sanity check
+    if (maxConnectors > (this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) && !this.stationInfo.randomConnectors) {
+      logger.warn(`${this.logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this.stationTemplateFile}, forcing random connector configurations affectation`);
+      this.stationInfo.randomConnectors = true;
+    }
+    const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this.stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
+    const connectorsConfigChanged = this.connectors?.size !== 0 && this.connectorsConfigurationHash !== connectorsConfigHash;
+    if (this.connectors?.size === 0 || connectorsConfigChanged) {
+      connectorsConfigChanged && (this.connectors.clear());
+      this.connectorsConfigurationHash = connectorsConfigHash;
+      // Add connector Id 0
+      let lastConnector = '0';
+      for (lastConnector in this.stationInfo.Connectors) {
+        const lastConnectorId = Utils.convertToInt(lastConnector);
+        if (lastConnectorId === 0 && this.getUseConnectorId0() && this.stationInfo.Connectors[lastConnector]) {
+          this.connectors.set(lastConnectorId, Utils.cloneObject<ConnectorStatus>(this.stationInfo.Connectors[lastConnector]));
+          this.getConnectorStatus(lastConnectorId).availability = AvailabilityType.OPERATIVE;
+          if (Utils.isUndefined(this.getConnectorStatus(lastConnectorId)?.chargingProfiles)) {
+            this.getConnectorStatus(lastConnectorId).chargingProfiles = [];
+          }
         }
-      }, interval);
-    } else {
-      logger.error(`${this._logPrefix()} Charging station MeterValueSampleInterval configuration set to ${Utils.milliSecondsToHHMMSS(interval)}, not sending MeterValues`);
+      }
+      // Generate all connectors
+      if ((this.stationInfo.Connectors[0] ? templateMaxConnectors - 1 : templateMaxConnectors) > 0) {
+        for (let index = 1; index <= maxConnectors; index++) {
+          const randConnectorId = this.stationInfo.randomConnectors ? Utils.getRandomInteger(Utils.convertToInt(lastConnector), 1) : index;
+          this.connectors.set(index, Utils.cloneObject<ConnectorStatus>(this.stationInfo.Connectors[randConnectorId]));
+          this.getConnectorStatus(index).availability = AvailabilityType.OPERATIVE;
+          if (Utils.isUndefined(this.getConnectorStatus(index)?.chargingProfiles)) {
+            this.getConnectorStatus(index).chargingProfiles = [];
+          }
+        }
+      }
     }
-  }
-
-  _openWSConnection(options?: WebSocket.ClientOptions, forceCloseOpened = false): void {
-    if (Utils.isUndefined(options)) {
-      options = {} as WebSocket.ClientOptions;
+    // Avoid duplication of connectors related information
+    delete this.stationInfo.Connectors;
+    // Initialize transaction attributes on connectors
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0 && !this.getConnectorStatus(connectorId)?.transactionStarted) {
+        this.initializeConnectorStatus(connectorId);
+      }
     }
-    if (Utils.isUndefined(options.handshakeTimeout)) {
-      options.handshakeTimeout = this._getConnectionTimeout() * 1000;
+    this.wsConfiguredConnectionUrl = new URL(this.getConfiguredSupervisionUrl().href + '/' + this.stationInfo.chargingStationId);
+    switch (this.getOcppVersion()) {
+      case OCPPVersion.VERSION_16:
+        this.ocppIncomingRequestService = new OCPP16IncomingRequestService(this);
+        this.ocppRequestService = new OCPP16RequestService(this, new OCPP16ResponseService(this));
+        break;
+      default:
+        this.handleUnsupportedVersion(this.getOcppVersion());
+        break;
     }
-    if (this._isWebSocketOpen() && forceCloseOpened) {
-      this._wsConnection.close();
+    // OCPP parameters
+    this.initOcppParameters();
+    if (this.stationInfo.autoRegister) {
+      this.bootNotificationResponse = {
+        currentTime: new Date().toISOString(),
+        interval: this.getHeartbeatInterval() / 1000,
+        status: RegistrationStatus.ACCEPTED
+      };
     }
-    this._wsConnection = new WebSocket(this._wsConnectionUrl, 'ocpp' + Constants.OCPP_VERSION_16, options);
-    logger.info(this._logPrefix() + ' Will communicate through URL ' + this._supervisionUrl);
-  }
-
-  start(): void {
-    this._openWSConnection();
-    // Monitor authorization file
-    this._startAuthorizationFileMonitoring();
-    // Monitor station template file
-    this._startStationTemplateFileMonitoring();
-    // Handle Socket incoming messages
-    this._wsConnection.on('message', this.onMessage.bind(this));
-    // Handle Socket error
-    this._wsConnection.on('error', this.onError.bind(this));
-    // Handle Socket close
-    this._wsConnection.on('close', this.onClose.bind(this));
-    // Handle Socket opening connection
-    this._wsConnection.on('open', this.onOpen.bind(this));
-    // Handle Socket ping
-    this._wsConnection.on('ping', this.onPing.bind(this));
-    // Handle Socket pong
-    this._wsConnection.on('pong', this.onPong.bind(this));
-  }
-
-  async stop(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
-    // Stop message sequence
-    await this._stopMessageSequence(reason);
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0) {
-        await this.sendStatusNotification(Utils.convertToInt(connector), ChargePointStatus.UNAVAILABLE);
+    this.stationInfo.powerDivider = this.getPowerDivider();
+    if (this.getEnableStatistics()) {
+      this.performanceStatistics = new PerformanceStatistics(this.stationInfo.chargingStationId, this.wsConnectionUrl);
+    }
+  }
+
+  private initOcppParameters(): void {
+    if (this.getSupervisionUrlOcppConfiguration() && !this.getConfigurationKey(this.stationInfo.supervisionUrlOcppKey ?? VendorDefaultParametersKey.ConnectionUrl)) {
+      this.addConfigurationKey(VendorDefaultParametersKey.ConnectionUrl, this.getConfiguredSupervisionUrl().href, { reboot: true });
+    }
+    if (!this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles)) {
+      this.addConfigurationKey(StandardParametersKey.SupportedFeatureProfiles, `${SupportedFeatureProfiles.Core},${SupportedFeatureProfiles.Local_Auth_List_Management},${SupportedFeatureProfiles.Smart_Charging}`);
+    }
+    this.addConfigurationKey(StandardParametersKey.NumberOfConnectors, this.getNumberOfConnectors().toString(), { readonly: true });
+    if (!this.getConfigurationKey(StandardParametersKey.MeterValuesSampledData)) {
+      this.addConfigurationKey(StandardParametersKey.MeterValuesSampledData, MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER);
+    }
+    if (!this.getConfigurationKey(StandardParametersKey.ConnectorPhaseRotation)) {
+      const connectorPhaseRotation = [];
+      for (const connectorId of this.connectors.keys()) {
+        // AC/DC
+        if (connectorId === 0 && this.getNumberOfPhases() === 0) {
+          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
+        } else if (connectorId > 0 && this.getNumberOfPhases() === 0) {
+          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
+        // AC
+        } else if (connectorId > 0 && this.getNumberOfPhases() === 1) {
+          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.NotApplicable}`);
+        } else if (connectorId > 0 && this.getNumberOfPhases() === 3) {
+          connectorPhaseRotation.push(`${connectorId}.${ConnectorPhaseRotation.RST}`);
+        }
       }
+      this.addConfigurationKey(StandardParametersKey.ConnectorPhaseRotation, connectorPhaseRotation.toString());
     }
-    if (this._isWebSocketOpen()) {
-      this._wsConnection.close();
+    if (!this.getConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests)) {
+      this.addConfigurationKey(StandardParametersKey.AuthorizeRemoteTxRequests, 'true');
     }
-    this._bootNotificationResponse = null;
-    this._hasStopped = true;
-  }
-
-  async _reconnect(error): Promise<void> {
-    // Stop heartbeat
-    this._stopHeartbeat();
-    // Stop the ATG if needed
-    if (this._stationInfo.AutomaticTransactionGenerator.enable &&
-      this._stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
-      this._automaticTransactionGeneration &&
-      !this._automaticTransactionGeneration.timeToStop) {
-      this._automaticTransactionGeneration.stop().catch(() => { });
-    }
-    if (this._autoReconnectRetryCount < this._getAutoReconnectMaxRetries() || this._getAutoReconnectMaxRetries() === -1) {
-      this._autoReconnectRetryCount++;
-      const reconnectDelay = (this._getReconnectExponentialDelay() ? Utils.exponentialDelay(this._autoReconnectRetryCount) : this._getConnectionTimeout() * 1000);
-      logger.error(`${this._logPrefix()} Socket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectDelay - 100}ms`);
-      await Utils.sleep(reconnectDelay);
-      logger.error(this._logPrefix() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount.toString());
-      this._openWSConnection({ handshakeTimeout: reconnectDelay - 100 });
-      this._hasSocketRestarted = true;
-    } else if (this._getAutoReconnectMaxRetries() !== -1) {
-      logger.error(`${this._logPrefix()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._getAutoReconnectMaxRetries()})`);
+    if (!this.getConfigurationKey(StandardParametersKey.LocalAuthListEnabled)
+      && this.getConfigurationKey(StandardParametersKey.SupportedFeatureProfiles).value.includes(SupportedFeatureProfiles.Local_Auth_List_Management)) {
+      this.addConfigurationKey(StandardParametersKey.LocalAuthListEnabled, 'false');
+    }
+    if (!this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
+      this.addConfigurationKey(StandardParametersKey.ConnectionTimeOut, Constants.DEFAULT_CONNECTION_TIMEOUT.toString());
     }
   }
 
-  async onOpen(): Promise<void> {
-    logger.info(`${this._logPrefix()} Is connected to server through ${this._wsConnectionUrl}`);
-    if (!this._isRegistered()) {
+  private async onOpen(): Promise<void> {
+    logger.info(`${this.logPrefix()} Connected to OCPP server through ${this.wsConnectionUrl.toString()}`);
+    if (!this.isRegistered()) {
       // Send BootNotification
       let registrationRetryCount = 0;
       do {
-        this._bootNotificationResponse = await this.sendBootNotification();
-        if (!this._isRegistered()) {
+        this.bootNotificationResponse = await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel,
+          this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
+        if (!this.isRegistered()) {
           registrationRetryCount++;
-          await Utils.sleep(this._bootNotificationResponse.interval * 1000);
-        }
-      } while (!this._isRegistered() && (registrationRetryCount <= this._getRegistrationMaxRetries() || this._getRegistrationMaxRetries() === -1));
-    }
-    if (this._isRegistered()) {
-      await this._startMessageSequence();
-      if (this._hasSocketRestarted && this._isWebSocketOpen()) {
-        if (!Utils.isEmptyArray(this._messageQueue)) {
-          this._messageQueue.forEach((message, index) => {
-            this._messageQueue.splice(index, 1);
-            this._wsConnection.send(message);
-          });
+          await Utils.sleep(this.bootNotificationResponse?.interval ? this.bootNotificationResponse.interval * 1000 : Constants.OCPP_DEFAULT_BOOT_NOTIFICATION_INTERVAL);
         }
+      } while (!this.isRegistered() && (registrationRetryCount <= this.getRegistrationMaxRetries() || this.getRegistrationMaxRetries() === -1));
+    }
+    if (this.isRegistered() && this.stationInfo.autoRegister) {
+      await this.ocppRequestService.sendBootNotification(this.bootNotificationRequest.chargePointModel,
+        this.bootNotificationRequest.chargePointVendor, this.bootNotificationRequest.chargeBoxSerialNumber, this.bootNotificationRequest.firmwareVersion);
+    }
+    if (this.isInAcceptedState()) {
+      await this.startMessageSequence();
+      this.stopped && (this.stopped = false);
+      if (this.wsConnectionRestarted && this.isWebSocketConnectionOpened()) {
+        this.flushMessageBuffer();
+      }
+    } else if (this.isInPendingState()) {
+      // The central server shall issue a TriggerMessage to the charging station for the boot notification at the end of its configuration process
+      while (!this.isInAcceptedState()) {
+        await Utils.sleep(Constants.CHARGING_STATION_DEFAULT_START_SEQUENCE_DELAY);
+      }
+      await this.startMessageSequence();
+      this.stopped && (this.stopped = false);
+      if (this.wsConnectionRestarted && this.isWebSocketConnectionOpened()) {
+        this.flushMessageBuffer();
       }
     } else {
-      logger.error(`${this._logPrefix()} Registration: max retries reached (${this._getRegistrationMaxRetries()}) or retry disabled (${this._getRegistrationMaxRetries()})`);
+      logger.error(`${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`);
     }
-    this._autoReconnectRetryCount = 0;
-    this._hasSocketRestarted = false;
+    this.autoReconnectRetryCount = 0;
+    this.wsConnectionRestarted = false;
   }
 
-  async onError(errorEvent): Promise<void> {
-    logger.error(this._logPrefix() + ' Socket error: %j', errorEvent);
-    // pragma switch (errorEvent.code) {
-    //   case 'ECONNREFUSED':
-    //     await this._reconnect(errorEvent);
-    //     break;
-    // }
-  }
-
-  async onClose(closeEvent): Promise<void> {
-    switch (closeEvent) {
-      case WebSocketCloseEventStatusCode.CLOSE_NORMAL: // Normal close
+  private async onClose(code: number, reason: string): Promise<void> {
+    switch (code) {
+      // Normal close
+      case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
-        logger.info(`${this._logPrefix()} Socket normally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
-        this._autoReconnectRetryCount = 0;
+        logger.info(`${this.logPrefix()} WebSocket normally closed with status '${Utils.getWebSocketCloseEventStatusString(code)}' and reason '${reason}'`);
+        this.autoReconnectRetryCount = 0;
         break;
-      default: // Abnormal close
-        logger.error(`${this._logPrefix()} Socket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(closeEvent)}'`);
-        await this._reconnect(closeEvent);
+      // Abnormal close
+      default:
+        logger.error(`${this.logPrefix()} WebSocket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(code)}' and reason '${reason}'`);
+        await this.reconnect(code);
         break;
     }
   }
 
-  onPing(): void {
-    logger.debug(this._logPrefix() + ' Has received a WS ping (rfc6455) from the server');
-  }
-
-  onPong(): void {
-    logger.debug(this._logPrefix() + ' Has received a WS pong (rfc6455) from the server');
-  }
-
-  async onMessage(messageEvent: MessageEvent): Promise<void> {
-    let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
+  private async onMessage(data: Data): Promise<void> {
+    let [messageType, messageId, commandName, commandPayload, errorDetails]: IncomingRequest = [0, '', '' as IncomingRequestCommand, {}, {}];
+    let responseCallback: (payload: Record<string, unknown> | string, requestPayload: Record<string, unknown>) => void;
+    let rejectCallback: (error: OCPPError, requestStatistic?: boolean) => void;
+    let requestCommandName: RequestCommand | IncomingRequestCommand;
+    let requestPayload: Record<string, unknown>;
+    let cachedRequest: CachedRequest;
+    let errMsg: string;
     try {
-      // Parse the message
-      [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(messageEvent.toString());
-
+      const request = JSON.parse(data.toString()) as IncomingRequest;
+      if (Utils.isIterable(request)) {
+        // Parse the message
+        [messageType, messageId, commandName, commandPayload, errorDetails] = request;
+      } else {
+        throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming request is not iterable', commandName);
+      }
       // Check the Type of message
       switch (messageType) {
         // Incoming Message
-        case Constants.OCPP_JSON_CALL_MESSAGE:
+        case MessageType.CALL_MESSAGE:
           if (this.getEnableStatistics()) {
-            this._statistics.addMessage(commandName, messageType);
+            this.performanceStatistics.addRequestStatistic(commandName, messageType);
           }
           // Process the call
-          await this.handleRequest(messageId, commandName, commandPayload);
+          await this.ocppIncomingRequestService.handleRequest(messageId, commandName, commandPayload);
           break;
         // Outcome Message
-        case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
+        case MessageType.CALL_RESULT_MESSAGE:
           // Respond
-          // eslint-disable-next-line no-case-declarations
-          let responseCallback; let requestPayload;
-          if (Utils.isIterable(this._requests[messageId])) {
-            [responseCallback, , requestPayload] = this._requests[messageId];
+          cachedRequest = this.requests.get(messageId);
+          if (Utils.isIterable(cachedRequest)) {
+            [responseCallback, , , requestPayload] = cachedRequest;
           } else {
-            throw new Error(`Response request for message id ${messageId} is not iterable`);
+            throw new OCPPError(ErrorType.PROTOCOL_ERROR, `Cached request for message id ${messageId} response is not iterable`, commandName);
           }
           if (!responseCallback) {
             // Error
-            throw new Error(`Response request for unknown message id ${messageId}`);
+            throw new OCPPError(ErrorType.INTERNAL_ERROR, `Response for unknown message id ${messageId}`, commandName);
           }
-          delete this._requests[messageId];
           responseCallback(commandName, requestPayload);
           break;
         // Error Message
-        case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
-          if (!this._requests[messageId]) {
-            // Error
-            throw new Error(`Error request for unknown message id ${messageId}`);
-          }
-          // eslint-disable-next-line no-case-declarations
-          let rejectCallback;
-          if (Utils.isIterable(this._requests[messageId])) {
-            [, rejectCallback] = this._requests[messageId];
+        case MessageType.CALL_ERROR_MESSAGE:
+          cachedRequest = this.requests.get(messageId);
+          if (Utils.isIterable(cachedRequest)) {
+            [, rejectCallback, requestCommandName] = cachedRequest;
           } else {
-            throw new Error(`Error request for message id ${messageId} is not iterable`);
+            throw new OCPPError(ErrorType.PROTOCOL_ERROR, `Cached request for message id ${messageId} error response is not iterable`);
+          }
+          if (!rejectCallback) {
+            // Error
+            throw new OCPPError(ErrorType.INTERNAL_ERROR, `Error response for unknown message id ${messageId}`, requestCommandName);
           }
-          delete this._requests[messageId];
-          rejectCallback(new OCPPError(commandName, commandPayload, errorDetails));
+          rejectCallback(new OCPPError(commandName, commandPayload.toString(), requestCommandName, errorDetails));
           break;
         // Error
         default:
-          // eslint-disable-next-line no-case-declarations
-          const errMsg = `${this._logPrefix()} Wrong message type ${messageType}`;
+          errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
           logger.error(errMsg);
-          throw new Error(errMsg);
+          throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg);
       }
     } catch (error) {
       // Log
-      logger.error('%s Incoming message %j processing error %s on request content type %s', this._logPrefix(), messageEvent, error, this._requests[messageId]);
+      logger.error('%s Incoming OCPP message %j matching cached request %j processing error %j', this.logPrefix(), data.toString(), this.requests.get(messageId), error);
       // Send error
-      messageType !== Constants.OCPP_JSON_CALL_ERROR_MESSAGE && await this.sendError(messageId, error, commandName);
+      messageType === MessageType.CALL_MESSAGE && await this.ocppRequestService.sendError(messageId, error as OCPPError, commandName);
     }
   }
 
-  async sendHeartbeat(): Promise<void> {
-    try {
-      const payload: HeartbeatRequest = {};
-      await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
-    } catch (error) {
-      logger.error(this._logPrefix() + ' Send Heartbeat error: %j', error);
-      throw error;
-    }
+  private onPing(): void {
+    logger.debug(this.logPrefix() + ' Received a WS ping (rfc6455) from the server');
   }
 
-  async sendBootNotification(): Promise<BootNotificationResponse> {
-    try {
-      return await this.sendMessage(Utils.generateUUID(), this._bootNotificationRequest, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification') as BootNotificationResponse;
-    } catch (error) {
-      logger.error(this._logPrefix() + ' Send BootNotification error: %j', error);
-      throw error;
-    }
+  private onPong(): void {
+    logger.debug(this.logPrefix() + ' Received a WS pong (rfc6455) from the server');
   }
 
-  async sendStatusNotification(connectorId: number, status: ChargePointStatus, errorCode: ChargePointErrorCode = ChargePointErrorCode.NO_ERROR): Promise<void> {
-    this.getConnector(connectorId).status = status;
-    try {
-      const payload: StatusNotificationRequest = {
-        connectorId,
-        errorCode,
-        status,
-      };
-      await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
-    } catch (error) {
-      logger.error(this._logPrefix() + ' Send StatusNotification error: %j', error);
-      throw error;
-    }
+  private async onError(error: WSError): Promise<void> {
+    logger.error(this.logPrefix() + ' WebSocket error: %j', error);
+    // switch (error.code) {
+    //   case 'ECONNREFUSED':
+    //     await this.reconnect(error);
+    //     break;
+    // }
   }
 
-  async sendStartTransaction(connectorId: number, idTag?: string): Promise<StartTransactionResponse> {
-    try {
-      const payload: StartTransactionRequest = {
-        connectorId,
-        ...!Utils.isUndefined(idTag) ? { idTag } : { idTag: Constants.TRANSACTION_DEFAULT_IDTAG },
-        meterStart: 0,
-        timestamp: new Date().toISOString(),
-      };
-      return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction') as StartTransactionResponse;
-    } catch (error) {
-      logger.error(this._logPrefix() + ' Send StartTransaction error: %j', error);
-      throw error;
-    }
+  private getTemplateChargingStationConfiguration(): ChargingStationConfiguration {
+    return this.stationInfo.Configuration ?? {} as ChargingStationConfiguration;
   }
 
-  async sendStopTransaction(transactionId: number, reason: StopTransactionReason = StopTransactionReason.NONE): Promise<StopTransactionResponse> {
-    const idTag = this._getTransactionIdTag(transactionId);
-    try {
-      const payload: StopTransactionRequest = {
-        transactionId,
-        ...!Utils.isUndefined(idTag) && { idTag: idTag },
-        meterStop: this._getTransactionMeterStop(transactionId),
-        timestamp: new Date().toISOString(),
-        ...reason && { reason },
-      };
-      return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction') as StartTransactionResponse;
-    } catch (error) {
-      logger.error(this._logPrefix() + ' Send StopTransaction error: %j', error);
-      throw error;
-    }
+  private getAuthorizationFile(): string | undefined {
+    return this.stationInfo.authorizationFile && path.join(path.resolve(__dirname, '../'), 'assets', path.basename(this.stationInfo.authorizationFile));
   }
 
-  // eslint-disable-next-line consistent-this
-  async sendMeterValues(connectorId: number, interval: number, self: ChargingStation, debug = false): Promise<void> {
-    try {
-      const meterValue: MeterValue = {
-        timestamp: new Date().toISOString(),
-        sampledValue: [],
-      };
-      const meterValuesTemplate: SampledValue[] = self.getConnector(connectorId).MeterValues;
-      for (let index = 0; index < meterValuesTemplate.length; index++) {
-        const connector = self.getConnector(connectorId);
-        // SoC measurand
-        if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.STATE_OF_CHARGE && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.STATE_OF_CHARGE)) {
-          meterValue.sampledValue.push({
-            ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.PERCENT },
-            ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-            measurand: meterValuesTemplate[index].measurand,
-            ...!Utils.isUndefined(meterValuesTemplate[index].location) ? { location: meterValuesTemplate[index].location } : { location: MeterValueLocation.EV },
-            ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: Utils.getRandomInt(100).toString() },
-          });
-          const sampledValuesIndex = meterValue.sampledValue.length - 1;
-          if (Utils.convertToInt(meterValue.sampledValue[sampledValuesIndex].value) > 100 || debug) {
-            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: ${meterValue.sampledValue[sampledValuesIndex].value}/100`);
-          }
-        // Voltage measurand
-        } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.VOLTAGE && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.VOLTAGE)) {
-          const voltageMeasurandValue = Utils.getRandomFloatRounded(self._getVoltageOut() + self._getVoltageOut() * 0.1, self._getVoltageOut() - self._getVoltageOut() * 0.1);
-          meterValue.sampledValue.push({
-            ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.VOLT },
-            ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-            measurand: meterValuesTemplate[index].measurand,
-            ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-            ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: voltageMeasurandValue.toString() },
-          });
-          for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
-            let phaseValue: string;
-            if (self._getVoltageOut() >= 0 && self._getVoltageOut() <= 250) {
-              phaseValue = `L${phase}-N`;
-            } else if (self._getVoltageOut() > 250) {
-              phaseValue = `L${phase}-L${(phase + 1) % self._getNumberOfPhases() !== 0 ? (phase + 1) % self._getNumberOfPhases() : self._getNumberOfPhases()}`;
-            }
-            meterValue.sampledValue.push({
-              ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.VOLT },
-              ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-              measurand: meterValuesTemplate[index].measurand,
-              ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-              ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: voltageMeasurandValue.toString() },
-              phase: phaseValue as MeterValuePhase,
-            });
-          }
-        // Power.Active.Import measurand
-        } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.POWER_ACTIVE_IMPORT && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.POWER_ACTIVE_IMPORT)) {
-          // FIXME: factor out powerDivider checks
-          if (Utils.isUndefined(self._stationInfo.powerDivider)) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          }
-          const errMsg = `${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`;
-          const powerMeasurandValues = {} as MeasurandValues;
-          const maxPower = Math.round(self._stationInfo.maxPower / self._stationInfo.powerDivider);
-          const maxPowerPerPhase = Math.round((self._stationInfo.maxPower / self._stationInfo.powerDivider) / self._getNumberOfPhases());
-          switch (self._getPowerOutType()) {
-            case PowerOutType.AC:
-              if (Utils.isUndefined(meterValuesTemplate[index].value)) {
-                powerMeasurandValues.L1 = Utils.getRandomFloatRounded(maxPowerPerPhase);
-                powerMeasurandValues.L2 = 0;
-                powerMeasurandValues.L3 = 0;
-                if (self._getNumberOfPhases() === 3) {
-                  powerMeasurandValues.L2 = Utils.getRandomFloatRounded(maxPowerPerPhase);
-                  powerMeasurandValues.L3 = Utils.getRandomFloatRounded(maxPowerPerPhase);
-                }
-                powerMeasurandValues.allPhases = Utils.roundTo(powerMeasurandValues.L1 + powerMeasurandValues.L2 + powerMeasurandValues.L3, 2);
-              }
-              break;
-            case PowerOutType.DC:
-              if (Utils.isUndefined(meterValuesTemplate[index].value)) {
-                powerMeasurandValues.allPhases = Utils.getRandomFloatRounded(maxPower);
-              }
-              break;
-            default:
-              logger.error(errMsg);
-              throw Error(errMsg);
-          }
-          meterValue.sampledValue.push({
-            ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT },
-            ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-            measurand: meterValuesTemplate[index].measurand,
-            ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-            ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: powerMeasurandValues.allPhases.toString() },
-          });
-          const sampledValuesIndex = meterValue.sampledValue.length - 1;
-          if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxPower || debug) {
-            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}`);
-          }
-          for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
-            const phaseValue = `L${phase}-N`;
-            meterValue.sampledValue.push({
-              ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT },
-              ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-              ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
-              ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-              ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: powerMeasurandValues[`L${phase}`] as string },
-              phase: phaseValue as MeterValuePhase,
-            });
-          }
-        // Current.Import measurand
-        } else if (meterValuesTemplate[index].measurand && meterValuesTemplate[index].measurand === MeterValueMeasurand.CURRENT_IMPORT && self._getConfigurationKey('MeterValuesSampledData').value.includes(MeterValueMeasurand.CURRENT_IMPORT)) {
-          // FIXME: factor out powerDivider checks
-          if (Utils.isUndefined(self._stationInfo.powerDivider)) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          }
-          const errMsg = `${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`;
-          const currentMeasurandValues: MeasurandValues = {} as MeasurandValues;
-          let maxAmperage: number;
-          switch (self._getPowerOutType()) {
-            case PowerOutType.AC:
-              maxAmperage = ElectricUtils.ampPerPhaseFromPower(self._getNumberOfPhases(), self._stationInfo.maxPower / self._stationInfo.powerDivider, self._getVoltageOut());
-              if (Utils.isUndefined(meterValuesTemplate[index].value)) {
-                currentMeasurandValues.L1 = Utils.getRandomFloatRounded(maxAmperage);
-                currentMeasurandValues.L2 = 0;
-                currentMeasurandValues.L3 = 0;
-                if (self._getNumberOfPhases() === 3) {
-                  currentMeasurandValues.L2 = Utils.getRandomFloatRounded(maxAmperage);
-                  currentMeasurandValues.L3 = Utils.getRandomFloatRounded(maxAmperage);
-                }
-                currentMeasurandValues.allPhases = Utils.roundTo((currentMeasurandValues.L1 + currentMeasurandValues.L2 + currentMeasurandValues.L3) / self._getNumberOfPhases(), 2);
-              }
-              break;
-            case PowerOutType.DC:
-              maxAmperage = ElectricUtils.ampTotalFromPower(self._stationInfo.maxPower / self._stationInfo.powerDivider, self._getVoltageOut());
-              if (Utils.isUndefined(meterValuesTemplate[index].value)) {
-                currentMeasurandValues.allPhases = Utils.getRandomFloatRounded(maxAmperage);
-              }
-              break;
-            default:
-              logger.error(errMsg);
-              throw Error(errMsg);
-          }
-          meterValue.sampledValue.push({
-            ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.AMP },
-            ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-            measurand: meterValuesTemplate[index].measurand,
-            ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-            ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: currentMeasurandValues.allPhases.toString() },
-          });
-          const sampledValuesIndex = meterValue.sampledValue.length - 1;
-          if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxAmperage || debug) {
-            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}`);
-          }
-          for (let phase = 1; self._getNumberOfPhases() === 3 && phase <= self._getNumberOfPhases(); phase++) {
-            const phaseValue = `L${phase}`;
-            meterValue.sampledValue.push({
-              ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.AMP },
-              ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-              ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
-              ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-              ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } : { value: currentMeasurandValues[phaseValue] as string },
-              phase: phaseValue as MeterValuePhase,
-            });
-          }
-        // Energy.Active.Import.Register measurand (default)
-        } else if (!meterValuesTemplate[index].measurand || meterValuesTemplate[index].measurand === MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER) {
-          // FIXME: factor out powerDivider checks
-          if (Utils.isUndefined(self._stationInfo.powerDivider)) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider is undefined`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
-            const errMsg = `${self._logPrefix()} MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
-            logger.error(errMsg);
-            throw Error(errMsg);
-          }
-          if (Utils.isUndefined(meterValuesTemplate[index].value)) {
-            const measurandValue = Utils.getRandomInt(self._stationInfo.maxPower / (self._stationInfo.powerDivider * 3600000) * interval);
-            // Persist previous value in connector
-            if (connector && !Utils.isNullOrUndefined(connector.lastEnergyActiveImportRegisterValue) && connector.lastEnergyActiveImportRegisterValue >= 0) {
-              connector.lastEnergyActiveImportRegisterValue += measurandValue;
-            } else {
-              connector.lastEnergyActiveImportRegisterValue = 0;
-            }
-          }
-          meterValue.sampledValue.push({
-            ...!Utils.isUndefined(meterValuesTemplate[index].unit) ? { unit: meterValuesTemplate[index].unit } : { unit: MeterValueUnit.WATT_HOUR },
-            ...!Utils.isUndefined(meterValuesTemplate[index].context) && { context: meterValuesTemplate[index].context },
-            ...!Utils.isUndefined(meterValuesTemplate[index].measurand) && { measurand: meterValuesTemplate[index].measurand },
-            ...!Utils.isUndefined(meterValuesTemplate[index].location) && { location: meterValuesTemplate[index].location },
-            ...!Utils.isUndefined(meterValuesTemplate[index].value) ? { value: meterValuesTemplate[index].value } :
-              { value: connector.lastEnergyActiveImportRegisterValue.toString() },
-          });
-          const sampledValuesIndex = meterValue.sampledValue.length - 1;
-          const maxConsumption = Math.round(self._stationInfo.maxPower * 3600 / (self._stationInfo.powerDivider * interval));
-          if (Utils.convertToFloat(meterValue.sampledValue[sampledValuesIndex].value) > maxConsumption || debug) {
-            logger.error(`${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}`);
-          }
-        // Unsupported measurand
-        } else {
-          logger.info(`${self._logPrefix()} Unsupported MeterValues measurand ${meterValuesTemplate[index].measurand ? meterValuesTemplate[index].measurand : MeterValueMeasurand.ENERGY_ACTIVE_IMPORT_REGISTER} on connectorId ${connectorId}`);
-        }
+  private getAuthorizedTags(): string[] {
+    let authorizedTags: string[] = [];
+    const authorizationFile = this.getAuthorizationFile();
+    if (authorizationFile) {
+      try {
+        // Load authorization file
+        const fileDescriptor = fs.openSync(authorizationFile, 'r');
+        authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8')) as string[];
+        fs.closeSync(fileDescriptor);
+      } catch (error) {
+        FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error as NodeJS.ErrnoException);
       }
-      const payload: MeterValuesRequest = {
-        connectorId,
-        transactionId: self.getConnector(connectorId).transactionId,
-        meterValue: meterValue,
-      };
-      await self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
-    } catch (error) {
-      logger.error(self._logPrefix() + ' Send MeterValues error: %j', error);
-      throw error;
+    } else {
+      logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile);
     }
+    return authorizedTags;
   }
 
-  async sendError(messageId: string, err: Error | OCPPError, commandName: string): Promise<unknown> {
-    // Check exception type: only OCPP error are accepted
-    const error = err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message, err.stack && err.stack);
-    // Send error
-    return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE, commandName);
+  private getUseConnectorId0(): boolean | undefined {
+    return !Utils.isUndefined(this.stationInfo.useConnectorId0) ? this.stationInfo.useConnectorId0 : true;
   }
 
-  async sendMessage(messageId: string, commandParams, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName: string): Promise<any> {
-    // eslint-disable-next-line @typescript-eslint/no-this-alias
-    const self = this;
-    // Send a message through wsConnection
-    return new Promise((resolve: (value?: any | PromiseLike<any>) => void, reject: (reason?: any) => void) => {
-      let messageToSend;
-      // Type of message
-      switch (messageType) {
-        // Request
-        case Constants.OCPP_JSON_CALL_MESSAGE:
-          // Build request
-          this._requests[messageId] = [responseCallback, rejectCallback, commandParams];
-          messageToSend = JSON.stringify([messageType, messageId, commandName, commandParams]);
-          break;
-        // Response
-        case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
-          // Build response
-          messageToSend = JSON.stringify([messageType, messageId, commandParams]);
-          break;
-        // Error Message
-        case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
-          // Build Error Message
-          messageToSend = JSON.stringify([messageType, messageId, commandParams.code ? commandParams.code : Constants.OCPP_ERROR_GENERIC_ERROR, commandParams.message ? commandParams.message : '', commandParams.details ? commandParams.details : {}]);
-          break;
-      }
-      // Check if wsConnection opened and charging station registered
-      if (this._isWebSocketOpen() && (this._isRegistered() || commandName === 'BootNotification')) {
-        if (this.getEnableStatistics()) {
-          this._statistics.addMessage(commandName, messageType);
-        }
-        // Yes: Send Message
-        this._wsConnection.send(messageToSend);
-      } else {
-        let dups = false;
-        // Handle dups in buffer
-        for (const message of this._messageQueue) {
-          // Same message
-          if (JSON.stringify(messageToSend) === JSON.stringify(message)) {
-            dups = true;
-            break;
-          }
-        }
-        if (!dups) {
-          // Buffer message
-          this._messageQueue.push(messageToSend);
-        }
-        // Reject it
-        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 : {}));
-      }
-      // Response?
-      if (messageType === Constants.OCPP_JSON_CALL_RESULT_MESSAGE) {
-        // Yes: send Ok
-        resolve();
-      } else if (messageType === Constants.OCPP_JSON_CALL_ERROR_MESSAGE) {
-        // Send timeout
-        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);
+  private getNumberOfRunningTransactions(): number {
+    let trxCount = 0;
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
+        trxCount++;
       }
+    }
+    return trxCount;
+  }
 
-      // Function that will receive the request's response
-      async function responseCallback(payload, requestPayload): Promise<void> {
-        if (self.getEnableStatistics()) {
-          self._statistics.addMessage(commandName, messageType);
-        }
-        // Send the response
-        await self.handleResponse(commandName, payload, requestPayload);
-        resolve(payload);
-      }
+  // 0 for disabling
+  private getConnectionTimeout(): number | undefined {
+    if (this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut)) {
+      return parseInt(this.getConfigurationKey(StandardParametersKey.ConnectionTimeOut).value) ?? Constants.DEFAULT_CONNECTION_TIMEOUT;
+    }
+    return Constants.DEFAULT_CONNECTION_TIMEOUT;
+  }
 
-      // Function that will receive the request's rejection
-      function rejectCallback(error: OCPPError): void {
-        if (self.getEnableStatistics()) {
-          self._statistics.addMessage(commandName, messageType);
-        }
-        logger.debug(`${self._logPrefix()} Error: %j occurred when calling command %s with parameters: %j`, error, commandName, commandParams);
-        // Build Exception
-        // eslint-disable-next-line no-empty-function
-        self._requests[messageId] = [() => { }, () => { }, {}]; // Properly format the request
-        // Send error
-        reject(error);
-      }
-    });
+  // -1 for unlimited, 0 for disabling
+  private getAutoReconnectMaxRetries(): number | undefined {
+    if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
+      return this.stationInfo.autoReconnectMaxRetries;
+    }
+    if (!Utils.isUndefined(Configuration.getAutoReconnectMaxRetries())) {
+      return Configuration.getAutoReconnectMaxRetries();
+    }
+    return -1;
   }
 
-  async handleResponse(commandName: string, payload, requestPayload): Promise<void> {
-    const responseCallbackFn = 'handleResponse' + commandName;
-    if (typeof this[responseCallbackFn] === 'function') {
-      await this[responseCallbackFn](payload, requestPayload);
-    } else {
-      logger.error(this._logPrefix() + ' Trying to call an undefined response callback function: ' + responseCallbackFn);
+  // 0 for disabling
+  private getRegistrationMaxRetries(): number | undefined {
+    if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
+      return this.stationInfo.registrationMaxRetries;
     }
+    return -1;
   }
 
-  handleResponseBootNotification(payload: BootNotificationResponse, requestPayload: BootNotificationRequest): void {
-    if (payload.status === RegistrationStatus.ACCEPTED) {
-      this._heartbeatInterval = payload.interval * 1000;
-      this._heartbeatSetInterval ? this._restartHeartbeat() : this._startHeartbeat();
-      this._addConfigurationKey('HeartBeatInterval', payload.interval.toString());
-      this._addConfigurationKey('HeartbeatInterval', payload.interval.toString(), false, false);
-      this._hasStopped && (this._hasStopped = false);
-    } else if (payload.status === RegistrationStatus.PENDING) {
-      logger.info(this._logPrefix() + ' Charging station in pending state on the central server');
-    } else {
-      logger.info(this._logPrefix() + ' Charging station rejected by the central server');
+  private getPowerDivider(): number {
+    let powerDivider = this.getNumberOfConnectors();
+    if (this.stationInfo.powerSharedByConnectors) {
+      powerDivider = this.getNumberOfRunningTransactions();
     }
+    return powerDivider;
   }
 
-  _initTransactionOnConnector(connectorId: number): void {
-    this.getConnector(connectorId).transactionStarted = false;
-    this.getConnector(connectorId).transactionId = null;
-    this.getConnector(connectorId).idTag = null;
-    this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = -1;
+  private getTemplateMaxNumberOfConnectors(): number {
+    return Object.keys(this.stationInfo.Connectors).length;
   }
 
-  _resetTransactionOnConnector(connectorId: number): void {
-    this._initTransactionOnConnector(connectorId);
-    if (this.getConnector(connectorId).transactionSetInterval) {
-      clearInterval(this.getConnector(connectorId).transactionSetInterval);
+  private getMaxNumberOfConnectors(): number {
+    let maxConnectors: number;
+    if (!Utils.isEmptyArray(this.stationInfo.numberOfConnectors)) {
+      const numberOfConnectors = this.stationInfo.numberOfConnectors as number[];
+      // Distribute evenly the number of connectors
+      maxConnectors = numberOfConnectors[(this.index - 1) % numberOfConnectors.length];
+    } else if (!Utils.isUndefined(this.stationInfo.numberOfConnectors)) {
+      maxConnectors = this.stationInfo.numberOfConnectors as number;
+    } else {
+      maxConnectors = this.stationInfo.Connectors[0] ? this.getTemplateMaxNumberOfConnectors() - 1 : this.getTemplateMaxNumberOfConnectors();
     }
+    return maxConnectors;
   }
 
-  async handleResponseStartTransaction(payload: StartTransactionResponse, requestPayload: StartTransactionRequest): Promise<void> {
-    const connectorId = requestPayload.connectorId;
-    if (this.getConnector(connectorId).transactionStarted) {
-      logger.debug(this._logPrefix() + ' Trying to start a transaction on an already used connector ' + connectorId.toString() + ': %j', this.getConnector(connectorId));
-      return;
+  private async startMessageSequence(): Promise<void> {
+    // Start WebSocket ping
+    this.startWebSocketPing();
+    // Start heartbeat
+    this.startHeartbeat();
+    // Initialize connectors status
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId === 0) {
+        continue;
+      } else if (!this.stopped && !this.getConnectorStatus(connectorId)?.status && this.getConnectorStatus(connectorId)?.bootStatus) {
+        // Send status in template at startup
+        await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).bootStatus);
+        this.getConnectorStatus(connectorId).status = this.getConnectorStatus(connectorId).bootStatus;
+      } else if (this.stopped && this.getConnectorStatus(connectorId)?.status && this.getConnectorStatus(connectorId)?.bootStatus) {
+        // Send status in template after reset
+        await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).bootStatus);
+        this.getConnectorStatus(connectorId).status = this.getConnectorStatus(connectorId).bootStatus;
+      } else if (!this.stopped && this.getConnectorStatus(connectorId)?.status) {
+        // Send previous status at template reload
+        await this.ocppRequestService.sendStatusNotification(connectorId, this.getConnectorStatus(connectorId).status);
+      } else {
+        // Send default status
+        await this.ocppRequestService.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
+        this.getConnectorStatus(connectorId).status = ChargePointStatus.AVAILABLE;
+      }
     }
+    // Start the ATG
+    this.startAutomaticTransactionGenerator();
+  }
 
-    let transactionConnectorId: number;
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && Utils.convertToInt(connector) === connectorId) {
-        transactionConnectorId = Utils.convertToInt(connector);
-        break;
+  private startAutomaticTransactionGenerator() {
+    if (this.stationInfo.AutomaticTransactionGenerator.enable) {
+      if (!this.automaticTransactionGenerator) {
+        this.automaticTransactionGenerator = new AutomaticTransactionGenerator(this);
       }
-    }
-    if (!transactionConnectorId) {
-      logger.error(this._logPrefix() + ' Trying to start a transaction on a non existing connector Id ' + connectorId.toString());
-      return;
-    }
-    if (payload.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
-      this.getConnector(connectorId).transactionStarted = true;
-      this.getConnector(connectorId).transactionId = payload.transactionId;
-      this.getConnector(connectorId).idTag = requestPayload.idTag;
-      this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = 0;
-      await this.sendStatusNotification(connectorId, ChargePointStatus.CHARGING);
-      logger.info(this._logPrefix() + ' Transaction ' + payload.transactionId.toString() + ' STARTED on ' + this._stationInfo.name + '#' + connectorId.toString() + ' for idTag ' + requestPayload.idTag);
-      if (this._stationInfo.powerSharedByConnectors) {
-        this._stationInfo.powerDivider++;
+      if (!this.automaticTransactionGenerator.started) {
+        this.automaticTransactionGenerator.start();
       }
-      const configuredMeterValueSampleInterval = this._getConfigurationKey('MeterValueSampleInterval');
-      this._startMeterValues(connectorId,
-        configuredMeterValueSampleInterval ? Utils.convertToInt(configuredMeterValueSampleInterval.value) * 1000 : 60000);
-    } else {
-      logger.error(this._logPrefix() + ' Starting transaction id ' + payload.transactionId.toString() + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
-      this._resetTransactionOnConnector(connectorId);
-      await this.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
     }
   }
 
-  async handleResponseStopTransaction(payload: StopTransactionResponse, requestPayload: StopTransactionRequest): Promise<void> {
-    let transactionConnectorId: number;
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === requestPayload.transactionId) {
-        transactionConnectorId = Utils.convertToInt(connector);
-        break;
+  private async stopMessageSequence(reason: StopTransactionReason = StopTransactionReason.NONE): Promise<void> {
+    // Stop WebSocket ping
+    this.stopWebSocketPing();
+    // Stop heartbeat
+    this.stopHeartbeat();
+    // Stop the ATG
+    if (this.stationInfo.AutomaticTransactionGenerator.enable &&
+      this.automaticTransactionGenerator &&
+      this.automaticTransactionGenerator.started) {
+      this.automaticTransactionGenerator.stop();
+    } else {
+      for (const connectorId of this.connectors.keys()) {
+        if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
+          const transactionId = this.getConnectorStatus(connectorId).transactionId;
+          await this.ocppRequestService.sendStopTransaction(transactionId, this.getEnergyActiveImportRegisterByTransactionId(transactionId),
+            this.getTransactionIdTag(transactionId), reason);
+        }
       }
     }
-    if (!transactionConnectorId) {
-      logger.error(this._logPrefix() + ' Trying to stop a non existing transaction ' + requestPayload.transactionId.toString());
-      return;
-    }
-    if (payload.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
-      await this.sendStatusNotification(transactionConnectorId, ChargePointStatus.AVAILABLE);
-      if (this._stationInfo.powerSharedByConnectors) {
-        this._stationInfo.powerDivider--;
-      }
-      logger.info(this._logPrefix() + ' Transaction ' + requestPayload.transactionId.toString() + ' STOPPED on ' + this._stationInfo.name + '#' + transactionConnectorId.toString());
-      this._resetTransactionOnConnector(transactionConnectorId);
+  }
+
+  private startWebSocketPing(): void {
+    const webSocketPingInterval: number = this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval)
+      ? Utils.convertToInt(this.getConfigurationKey(StandardParametersKey.WebSocketPingInterval).value)
+      : 0;
+    if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
+      this.webSocketPingSetInterval = setInterval(() => {
+        if (this.isWebSocketConnectionOpened()) {
+          this.wsConnection.ping((): void => { /* This is intentional */ });
+        }
+      }, webSocketPingInterval * 1000);
+      logger.info(this.logPrefix() + ' WebSocket ping started every ' + Utils.formatDurationSeconds(webSocketPingInterval));
+    } else if (this.webSocketPingSetInterval) {
+      logger.info(this.logPrefix() + ' WebSocket ping every ' + Utils.formatDurationSeconds(webSocketPingInterval) + ' already started');
     } else {
-      logger.error(this._logPrefix() + ' Stopping transaction id ' + requestPayload.transactionId.toString() + ' REJECTED with status ' + payload.idTagInfo?.status);
+      logger.error(`${this.logPrefix()} WebSocket ping interval set to ${webSocketPingInterval ? Utils.formatDurationSeconds(webSocketPingInterval) : webSocketPingInterval}, not starting the WebSocket ping`);
     }
   }
 
-  handleResponseStatusNotification(payload: StatusNotificationRequest, requestPayload: StatusNotificationResponse): void {
-    logger.debug(this._logPrefix() + ' Status notification response received: %j to StatusNotification request: %j', payload, requestPayload);
+  private stopWebSocketPing(): void {
+    if (this.webSocketPingSetInterval) {
+      clearInterval(this.webSocketPingSetInterval);
+    }
   }
 
-  handleResponseMeterValues(payload: MeterValuesRequest, requestPayload: MeterValuesResponse): void {
-    logger.debug(this._logPrefix() + ' MeterValues response received: %j to MeterValues request: %j', payload, requestPayload);
+  private warnDeprecatedTemplateKey(template: ChargingStationTemplate, key: string, chargingStationId: string, logMsgToAppend = ''): void {
+    if (!Utils.isUndefined(template[key])) {
+      logger.warn(`${Utils.logPrefix(` ${chargingStationId} |`)} Deprecated template key '${key}' usage in file '${this.stationTemplateFile}'${logMsgToAppend && '. ' + logMsgToAppend}`);
+    }
   }
 
-  handleResponseHeartbeat(payload: HeartbeatResponse, requestPayload: HeartbeatRequest): void {
-    logger.debug(this._logPrefix() + ' Heartbeat response received: %j to Heartbeat request: %j', payload, requestPayload);
+  private convertDeprecatedTemplateKey(template: ChargingStationTemplate, deprecatedKey: string, key: string): void {
+    if (!Utils.isUndefined(template[deprecatedKey])) {
+      // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+      template[key] = template[deprecatedKey];
+      delete template[deprecatedKey];
+    }
   }
 
-  async handleRequest(messageId: string, commandName: string, commandPayload): Promise<void> {
-    let response;
-    // Call
-    if (typeof this['handleRequest' + commandName] === 'function') {
-      try {
-        // Call the method to build the response
-        response = await this['handleRequest' + commandName](commandPayload);
-      } catch (error) {
-        // Log
-        logger.error(this._logPrefix() + ' Handle request error: %j', error);
-        // Send back response to inform backend
-        await this.sendError(messageId, error, commandName);
-        throw error;
+  private getConfiguredSupervisionUrl(): URL {
+    const supervisionUrls = Utils.cloneObject<string | string[]>(this.stationInfo.supervisionUrls ?? Configuration.getSupervisionUrls());
+    if (!Utils.isEmptyArray(supervisionUrls)) {
+      let urlIndex = 0;
+      switch (Configuration.getSupervisionUrlDistribution()) {
+        case SupervisionUrlDistribution.ROUND_ROBIN:
+          urlIndex = (this.index - 1) % supervisionUrls.length;
+          break;
+        case SupervisionUrlDistribution.RANDOM:
+          // Get a random url
+          urlIndex = Math.floor(Utils.secureRandom() * supervisionUrls.length);
+          break;
+        case SupervisionUrlDistribution.SEQUENTIAL:
+          if (this.index <= supervisionUrls.length) {
+            urlIndex = this.index - 1;
+          } else {
+            logger.warn(`${this.logPrefix()} No more configured supervision urls available, using the first one`);
+          }
+          break;
+        default:
+          logger.error(`${this.logPrefix()} Unknown supervision url distribution '${Configuration.getSupervisionUrlDistribution()}' from values '${SupervisionUrlDistribution.toString()}', defaulting to ${SupervisionUrlDistribution.ROUND_ROBIN}`);
+          urlIndex = (this.index - 1) % supervisionUrls.length;
+          break;
       }
-    } else {
-      // Throw exception
-      await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, `${commandName} is not implemented`, {}), commandName);
-      throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
+      return new URL(supervisionUrls[urlIndex]);
     }
-    // Send response
-    await this.sendMessage(messageId, response, Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName);
-  }
-
-  // Simulate charging station restart
-  handleRequestReset(commandPayload: ResetRequest): DefaultResponse {
-    setImmediate(async () => {
-      await this.stop(commandPayload.type + 'Reset' as StopTransactionReason);
-      await Utils.sleep(this._stationInfo.resetTime);
-      await this.start();
-    });
-    logger.info(`${this._logPrefix()} ${commandPayload.type} reset command received, simulating it. The station will be back online in ${Utils.milliSecondsToHHMMSS(this._stationInfo.resetTime)}`);
-    return Constants.OCPP_RESPONSE_ACCEPTED;
-  }
-
-  handleRequestClearCache(): DefaultResponse {
-    return Constants.OCPP_RESPONSE_ACCEPTED;
+    return new URL(supervisionUrls as string);
   }
 
-  async handleRequestUnlockConnector(commandPayload: UnlockConnectorRequest): Promise<UnlockConnectorResponse> {
-    const connectorId = commandPayload.connectorId;
-    if (connectorId === 0) {
-      logger.error(this._logPrefix() + ' Trying to unlock connector ' + connectorId.toString());
-      return Constants.OCPP_RESPONSE_UNLOCK_NOT_SUPPORTED;
+  private getHeartbeatInterval(): number | undefined {
+    const HeartbeatInterval = this.getConfigurationKey(StandardParametersKey.HeartbeatInterval);
+    if (HeartbeatInterval) {
+      return Utils.convertToInt(HeartbeatInterval.value) * 1000;
     }
-    if (this.getConnector(connectorId).transactionStarted) {
-      const stopResponse = await this.sendStopTransaction(this.getConnector(connectorId).transactionId, StopTransactionReason.UNLOCK_COMMAND);
-      if (stopResponse.idTagInfo?.status === AuthorizationStatus.ACCEPTED) {
-        return Constants.OCPP_RESPONSE_UNLOCKED;
-      }
-      return Constants.OCPP_RESPONSE_UNLOCK_FAILED;
+    const HeartBeatInterval = this.getConfigurationKey(StandardParametersKey.HeartBeatInterval);
+    if (HeartBeatInterval) {
+      return Utils.convertToInt(HeartBeatInterval.value) * 1000;
     }
-    await this.sendStatusNotification(connectorId, ChargePointStatus.AVAILABLE);
-    return Constants.OCPP_RESPONSE_UNLOCKED;
+    !this.stationInfo.autoRegister && logger.warn(`${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${Constants.DEFAULT_HEARTBEAT_INTERVAL}`);
+    return Constants.DEFAULT_HEARTBEAT_INTERVAL;
   }
 
-  _getConfigurationKey(key: string, caseInsensitive = false): ConfigurationKey {
-    return this._configuration.configurationKey.find((configElement) => {
-      if (caseInsensitive) {
-        return configElement.key.toLowerCase() === key.toLowerCase();
-      }
-      return configElement.key === key;
-    });
+  private stopHeartbeat(): void {
+    if (this.heartbeatSetInterval) {
+      clearInterval(this.heartbeatSetInterval);
+    }
   }
 
-  _addConfigurationKey(key: string, value: string, readonly = false, visible = true, reboot = false): void {
-    const keyFound = this._getConfigurationKey(key);
-    if (!keyFound) {
-      this._configuration.configurationKey.push({
-        key,
-        readonly,
-        value,
-        visible,
-        reboot,
-      });
+  private openWSConnection(options: ClientOptions & ClientRequestArgs = this.stationInfo.wsOptions, forceCloseOpened = false): void {
+    options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
+    if (!Utils.isNullOrUndefined(this.stationInfo.supervisionUser) && !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)) {
+      options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
     }
+    if (this.isWebSocketConnectionOpened() && forceCloseOpened) {
+      this.wsConnection.close();
+    }
+    let protocol: string;
+    switch (this.getOcppVersion()) {
+      case OCPPVersion.VERSION_16:
+        protocol = 'ocpp' + OCPPVersion.VERSION_16;
+        break;
+      default:
+        this.handleUnsupportedVersion(this.getOcppVersion());
+        break;
+    }
+    this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
+    logger.info(this.logPrefix() + ' Open OCPP connection to URL ' + this.wsConnectionUrl.toString());
   }
 
-  _setConfigurationKeyValue(key: string, value: string): void {
-    const keyFound = this._getConfigurationKey(key);
-    if (keyFound) {
-      const keyIndex = this._configuration.configurationKey.indexOf(keyFound);
-      this._configuration.configurationKey[keyIndex].value = value;
+  private stopMeterValues(connectorId: number) {
+    if (this.getConnectorStatus(connectorId)?.transactionSetInterval) {
+      clearInterval(this.getConnectorStatus(connectorId).transactionSetInterval);
     }
   }
 
-  handleRequestGetConfiguration(commandPayload: GetConfigurationRequest): GetConfigurationResponse {
-    const configurationKey: ConfigurationKey[] = [];
-    const unknownKey: string[] = [];
-    if (Utils.isEmptyArray(commandPayload.key)) {
-      for (const configuration of this._configuration.configurationKey) {
-        if (Utils.isUndefined(configuration.visible)) {
-          configuration.visible = true;
-        }
-        if (!configuration.visible) {
-          continue;
-        }
-        configurationKey.push({
-          key: configuration.key,
-          readonly: configuration.readonly,
-          value: configuration.value,
+  private startAuthorizationFileMonitoring(): void {
+    const authorizationFile = this.getAuthorizationFile();
+    if (authorizationFile) {
+      try {
+        fs.watch(authorizationFile, (event, filename) => {
+          if (filename && event === 'change') {
+            try {
+              logger.debug(this.logPrefix() + ' Authorization file ' + authorizationFile + ' have changed, reload');
+              // Initialize authorizedTags
+              this.authorizedTags = this.getAuthorizedTags();
+            } catch (error) {
+              logger.error(this.logPrefix() + ' Authorization file monitoring error: %j', error);
+            }
+          }
         });
+      } catch (error) {
+        FileUtils.handleFileException(this.logPrefix(), 'Authorization', authorizationFile, error as NodeJS.ErrnoException);
       }
     } else {
-      for (const key of commandPayload.key) {
-        const keyFound = this._getConfigurationKey(key);
-        if (keyFound) {
-          if (Utils.isUndefined(keyFound.visible)) {
-            keyFound.visible = true;
-          }
-          if (!keyFound.visible) {
-            continue;
+      logger.info(this.logPrefix() + ' No authorization file given in template file ' + this.stationTemplateFile + '. Not monitoring changes');
+    }
+  }
+
+  private startStationTemplateFileMonitoring(): void {
+    try {
+      fs.watch(this.stationTemplateFile, (event, filename): void => {
+        if (filename && event === 'change') {
+          try {
+            logger.debug(this.logPrefix() + ' Template file ' + this.stationTemplateFile + ' have changed, reload');
+            // Initialize
+            this.initialize();
+            // Restart the ATG
+            if (!this.stationInfo.AutomaticTransactionGenerator.enable &&
+              this.automaticTransactionGenerator) {
+              this.automaticTransactionGenerator.stop();
+            }
+            this.startAutomaticTransactionGenerator();
+            if (this.getEnableStatistics()) {
+              this.performanceStatistics.restart();
+            } else {
+              this.performanceStatistics.stop();
+            }
+            // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
+          } catch (error) {
+            logger.error(this.logPrefix() + ' Charging station template file monitoring error: %j', error);
           }
-          configurationKey.push({
-            key: keyFound.key,
-            readonly: keyFound.readonly,
-            value: keyFound.value,
-          });
-        } else {
-          unknownKey.push(key);
         }
-      }
+      });
+    } catch (error) {
+      FileUtils.handleFileException(this.logPrefix(), 'Template', this.stationTemplateFile, error as NodeJS.ErrnoException);
     }
-    return {
-      configurationKey,
-      unknownKey,
-    };
   }
 
-  handleRequestChangeConfiguration(commandPayload: ChangeConfigurationRequest): ChangeConfigurationResponse {
-    // JSON request fields type sanity check
-    if (!Utils.isString(commandPayload.key)) {
-      logger.error(`${this._logPrefix()} ChangeConfiguration request key field is not a string:`, commandPayload);
-    }
-    if (!Utils.isString(commandPayload.value)) {
-      logger.error(`${this._logPrefix()} ChangeConfiguration request value field is not a string:`, commandPayload);
-    }
-    const keyToChange = this._getConfigurationKey(commandPayload.key, true);
-    if (!keyToChange) {
-      return Constants.OCPP_CONFIGURATION_RESPONSE_NOT_SUPPORTED;
-    } else if (keyToChange && keyToChange.readonly) {
-      return Constants.OCPP_CONFIGURATION_RESPONSE_REJECTED;
-    } else if (keyToChange && !keyToChange.readonly) {
-      const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
-      let valueChanged = false;
-      if (this._configuration.configurationKey[keyIndex].value !== commandPayload.value) {
-        this._configuration.configurationKey[keyIndex].value = commandPayload.value;
-        valueChanged = true;
-      }
-      let triggerHeartbeatRestart = false;
-      if (keyToChange.key === 'HeartBeatInterval' && valueChanged) {
-        this._setConfigurationKeyValue('HeartbeatInterval', commandPayload.value);
-        triggerHeartbeatRestart = true;
-      }
-      if (keyToChange.key === 'HeartbeatInterval' && valueChanged) {
-        this._setConfigurationKeyValue('HeartBeatInterval', commandPayload.value);
-        triggerHeartbeatRestart = true;
-      }
-      if (triggerHeartbeatRestart) {
-        this._heartbeatInterval = Utils.convertToInt(commandPayload.value) * 1000;
-        this._restartHeartbeat();
-      }
-      if (keyToChange.key === 'WebSocketPingInterval' && valueChanged) {
-        this._restartWebSocketPing();
-      }
-      if (keyToChange.reboot) {
-        return Constants.OCPP_CONFIGURATION_RESPONSE_REBOOT_REQUIRED;
-      }
-      return Constants.OCPP_CONFIGURATION_RESPONSE_ACCEPTED;
-    }
+  private getReconnectExponentialDelay(): boolean | undefined {
+    return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay) ? this.stationInfo.reconnectExponentialDelay : false;
   }
 
-  handleRequestSetChargingProfile(commandPayload: SetChargingProfileRequest): SetChargingProfileResponse {
-    if (!this.getConnector(commandPayload.connectorId)) {
-      logger.error(`${this._logPrefix()} Trying to set a charging profile to a non existing connector Id ${commandPayload.connectorId}`);
-      return Constants.OCPP_CHARGING_PROFILE_RESPONSE_REJECTED;
-    }
-    if (commandPayload.csChargingProfiles.chargingProfilePurpose === ChargingProfilePurposeType.TX_PROFILE && !this.getConnector(commandPayload.connectorId)?.transactionStarted) {
-      return Constants.OCPP_CHARGING_PROFILE_RESPONSE_REJECTED;
-    }
-    this.getConnector(commandPayload.connectorId).chargingProfiles.forEach((chargingProfile: ChargingProfile, index: number) => {
-      if (chargingProfile.chargingProfileId === commandPayload.csChargingProfiles.chargingProfileId
-        || (chargingProfile.stackLevel === commandPayload.csChargingProfiles.stackLevel && chargingProfile.chargingProfilePurpose === commandPayload.csChargingProfiles.chargingProfilePurpose)) {
-        this.getConnector(commandPayload.connectorId).chargingProfiles[index] = chargingProfile;
-        return Constants.OCPP_CHARGING_PROFILE_RESPONSE_ACCEPTED;
-      }
-    });
-    this.getConnector(commandPayload.connectorId).chargingProfiles.push(commandPayload.csChargingProfiles);
-    return Constants.OCPP_CHARGING_PROFILE_RESPONSE_ACCEPTED;
-  }
-
-  async handleRequestRemoteStartTransaction(commandPayload: RemoteStartTransactionRequest): Promise<DefaultResponse> {
-    const transactionConnectorID: number = commandPayload.connectorId ? commandPayload.connectorId : 1;
-    if (this._getAuthorizeRemoteTxRequests() && this._getLocalAuthListEnabled() && this.hasAuthorizedTags()) {
-      // Check if authorized
-      if (this._authorizedTags.find((value) => value === commandPayload.idTag)) {
-        // Authorization successful start transaction
-        await this.sendStartTransaction(transactionConnectorID, commandPayload.idTag);
-        logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID.toString() + ' for idTag ' + commandPayload.idTag);
-        return Constants.OCPP_RESPONSE_ACCEPTED;
-      }
-      logger.error(this._logPrefix() + ' Remote starting transaction REJECTED, idTag ' + commandPayload.idTag);
-      return Constants.OCPP_RESPONSE_REJECTED;
+  private async reconnect(code: number): Promise<void> {
+    // Stop WebSocket ping
+    this.stopWebSocketPing();
+    // Stop heartbeat
+    this.stopHeartbeat();
+    // Stop the ATG if needed
+    if (this.stationInfo.AutomaticTransactionGenerator.enable &&
+      this.stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure &&
+      this.automaticTransactionGenerator &&
+      this.automaticTransactionGenerator.started) {
+      this.automaticTransactionGenerator.stop();
+    }
+    if (this.autoReconnectRetryCount < this.getAutoReconnectMaxRetries() || this.getAutoReconnectMaxRetries() === -1) {
+      this.autoReconnectRetryCount++;
+      const reconnectDelay = (this.getReconnectExponentialDelay() ? Utils.exponentialDelay(this.autoReconnectRetryCount) : this.getConnectionTimeout() * 1000);
+      const reconnectTimeout = (reconnectDelay - 100) > 0 && reconnectDelay;
+      logger.error(`${this.logPrefix()} WebSocket: connection retry in ${Utils.roundTo(reconnectDelay, 2)}ms, timeout ${reconnectTimeout}ms`);
+      await Utils.sleep(reconnectDelay);
+      logger.error(this.logPrefix() + ' WebSocket: reconnecting try #' + this.autoReconnectRetryCount.toString());
+      this.openWSConnection({ ...this.stationInfo.wsOptions, handshakeTimeout: reconnectTimeout }, true);
+      this.wsConnectionRestarted = true;
+    } else if (this.getAutoReconnectMaxRetries() !== -1) {
+      logger.error(`${this.logPrefix()} WebSocket reconnect failure: max retries reached (${this.autoReconnectRetryCount}) or retry disabled (${this.getAutoReconnectMaxRetries()})`);
     }
-    // No local authorization check required => start transaction
-    await this.sendStartTransaction(transactionConnectorID, commandPayload.idTag);
-    logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID.toString() + ' for idTag ' + commandPayload.idTag);
-    return Constants.OCPP_RESPONSE_ACCEPTED;
   }
 
-  async handleRequestRemoteStopTransaction(commandPayload: RemoteStopTransactionRequest): Promise<DefaultResponse> {
-    const transactionId = commandPayload.transactionId;
-    for (const connector in this._connectors) {
-      if (Utils.convertToInt(connector) > 0 && this.getConnector(Utils.convertToInt(connector)).transactionId === transactionId) {
-        await this.sendStopTransaction(transactionId);
-        return Constants.OCPP_RESPONSE_ACCEPTED;
-      }
-    }
-    logger.info(this._logPrefix() + ' Trying to remote stop a non existing transaction ' + transactionId.toString());
-    return Constants.OCPP_RESPONSE_REJECTED;
+  private initializeConnectorStatus(connectorId: number): void {
+    this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
+    this.getConnectorStatus(connectorId).idTagAuthorized = false;
+    this.getConnectorStatus(connectorId).transactionRemoteStarted = false;
+    this.getConnectorStatus(connectorId).transactionStarted = false;
+    this.getConnectorStatus(connectorId).energyActiveImportRegisterValue = 0;
+    this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
   }
 }