Switch log messages to string literal
[e-mobility-charging-stations-simulator.git] / src / charging-station / ChargingStation.ts
index d57dc5921194aff3ba3c8fcfcec23e7085ca86af..7fdc9a952e140372c44836e7b5f12107441e2805 100644 (file)
@@ -1,67 +1,89 @@
-// Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
+// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
 
-import crypto from 'crypto';
 import fs from 'fs';
+import crypto from 'node:crypto';
 import path from 'path';
 import { URL } from 'url';
 import { parentPort } from 'worker_threads';
 
-import WebSocket, { Data, RawData } from 'ws';
+import merge from 'just-merge';
+import WebSocket, { type RawData } from 'ws';
 
+import AuthorizedTagsCache from './AuthorizedTagsCache';
+import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
+import { ChargingStationConfigurationUtils } from './ChargingStationConfigurationUtils';
+import { ChargingStationUtils } from './ChargingStationUtils';
+import ChargingStationWorkerBroadcastChannel from './ChargingStationWorkerBroadcastChannel';
+import { MessageChannelUtils } from './MessageChannelUtils';
+import OCPP16IncomingRequestService from './ocpp/1.6/OCPP16IncomingRequestService';
+import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
+import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
+import { OCPP16ServiceUtils } from './ocpp/1.6/OCPP16ServiceUtils';
+import OCPP20IncomingRequestService from './ocpp/2.0/OCPP20IncomingRequestService';
+import OCPP20RequestService from './ocpp/2.0/OCPP20RequestService';
+import OCPP20ResponseService from './ocpp/2.0/OCPP20ResponseService';
+import type OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
+import type OCPPRequestService from './ocpp/OCPPRequestService';
+import { OCPPServiceUtils } from './ocpp/OCPPServiceUtils';
+import SharedLRUCache from './SharedLRUCache';
 import BaseError from '../exception/BaseError';
 import OCPPError from '../exception/OCPPError';
 import PerformanceStatistics from '../performance/PerformanceStatistics';
-import { AutomaticTransactionGeneratorConfiguration } from '../types/AutomaticTransactionGenerator';
-import ChargingStationConfiguration from '../types/ChargingStationConfiguration';
-import ChargingStationInfo from '../types/ChargingStationInfo';
-import ChargingStationOcppConfiguration from '../types/ChargingStationOcppConfiguration';
-import ChargingStationTemplate, {
+import type { AutomaticTransactionGeneratorConfiguration } from '../types/AutomaticTransactionGenerator';
+import type { ChargingStationConfiguration } from '../types/ChargingStationConfiguration';
+import type { ChargingStationInfo } from '../types/ChargingStationInfo';
+import type { ChargingStationOcppConfiguration } from '../types/ChargingStationOcppConfiguration';
+import {
+  type ChargingStationTemplate,
   CurrentType,
   PowerUnits,
-  WsOptions,
+  type WsOptions,
 } from '../types/ChargingStationTemplate';
-import { ChargingStationWorkerMessageEvents } from '../types/ChargingStationWorker';
 import { SupervisionUrlDistribution } from '../types/ConfigurationData';
-import { ConnectorStatus } from '../types/ConnectorStatus';
+import type { ConnectorStatus } from '../types/ConnectorStatus';
 import { FileType } from '../types/FileType';
-import { JsonType } from '../types/JsonType';
-import { ChargePointErrorCode } from '../types/ocpp/ChargePointErrorCode';
-import { ChargePointStatus } from '../types/ocpp/ChargePointStatus';
-import { ChargingProfile, ChargingRateUnitType } from '../types/ocpp/ChargingProfile';
+import type { JsonType } from '../types/JsonType';
 import {
   ConnectorPhaseRotation,
   StandardParametersKey,
   SupportedFeatureProfiles,
   VendorDefaultParametersKey,
 } from '../types/ocpp/Configuration';
+import { ConnectorStatusEnum } from '../types/ocpp/ConnectorStatusEnum';
 import { ErrorType } from '../types/ocpp/ErrorType';
 import { MessageType } from '../types/ocpp/MessageType';
 import { MeterValue, MeterValueMeasurand } from '../types/ocpp/MeterValues';
 import { OCPPVersion } from '../types/ocpp/OCPPVersion';
 import {
   AvailabilityType,
-  BootNotificationRequest,
-  CachedRequest,
-  HeartbeatRequest,
-  IncomingRequest,
+  type BootNotificationRequest,
+  type CachedRequest,
+  type ErrorCallback,
+  FirmwareStatus,
+  type FirmwareStatusNotificationRequest,
+  type HeartbeatRequest,
+  type IncomingRequest,
   IncomingRequestCommand,
-  MeterValuesRequest,
+  type MeterValuesRequest,
+  type OutgoingRequest,
   RequestCommand,
-  StatusNotificationRequest,
+  type ResponseCallback,
+  type StatusNotificationRequest,
 } from '../types/ocpp/Requests';
 import {
-  BootNotificationResponse,
-  ErrorResponse,
-  HeartbeatResponse,
-  MeterValuesResponse,
-  RegistrationStatus,
-  Response,
-  StatusNotificationResponse,
+  type BootNotificationResponse,
+  type ErrorResponse,
+  type FirmwareStatusNotificationResponse,
+  type HeartbeatResponse,
+  type MeterValuesResponse,
+  RegistrationStatusEnumType,
+  type Response,
+  type StatusNotificationResponse,
 } from '../types/ocpp/Responses';
 import {
   StopTransactionReason,
-  StopTransactionRequest,
-  StopTransactionResponse,
+  type StopTransactionRequest,
+  type StopTransactionResponse,
 } from '../types/ocpp/Transaction';
 import { WSError, WebSocketCloseEventStatusCode } from '../types/WebSocket';
 import Configuration from '../utils/Configuration';
@@ -70,72 +92,68 @@ import { ACElectricUtils, DCElectricUtils } from '../utils/ElectricUtils';
 import FileUtils from '../utils/FileUtils';
 import logger from '../utils/Logger';
 import Utils from '../utils/Utils';
-import AuthorizedTagsCache from './AuthorizedTagsCache';
-import AutomaticTransactionGenerator from './AutomaticTransactionGenerator';
-import { ChargingStationConfigurationUtils } from './ChargingStationConfigurationUtils';
-import { ChargingStationUtils } from './ChargingStationUtils';
-import OCPP16IncomingRequestService from './ocpp/1.6/OCPP16IncomingRequestService';
-import OCPP16RequestService from './ocpp/1.6/OCPP16RequestService';
-import OCPP16ResponseService from './ocpp/1.6/OCPP16ResponseService';
-import { OCPP16ServiceUtils } from './ocpp/1.6/OCPP16ServiceUtils';
-import OCPPIncomingRequestService from './ocpp/OCPPIncomingRequestService';
-import OCPPRequestService from './ocpp/OCPPRequestService';
-import SharedLRUCache from './SharedLRUCache';
 
 export default class ChargingStation {
-  public hashId!: string;
+  public readonly index: number;
   public readonly templateFile: string;
-  public authorizedTagsCache: AuthorizedTagsCache;
   public stationInfo!: ChargingStationInfo;
-  public readonly connectors: Map<number, ConnectorStatus>;
+  public started: boolean;
+  public starting: boolean;
+  public authorizedTagsCache: AuthorizedTagsCache;
+  public automaticTransactionGenerator!: AutomaticTransactionGenerator;
   public ocppConfiguration!: ChargingStationOcppConfiguration;
   public wsConnection!: WebSocket;
+  public readonly connectors: Map<number, ConnectorStatus>;
   public readonly requests: Map<string, CachedRequest>;
   public performanceStatistics!: PerformanceStatistics;
   public heartbeatSetInterval!: NodeJS.Timeout;
   public ocppRequestService!: OCPPRequestService;
+  public bootNotificationRequest!: BootNotificationRequest;
   public bootNotificationResponse!: BootNotificationResponse | null;
   public powerDivider!: number;
-  private readonly index: number;
+  private stopping: boolean;
   private configurationFile!: string;
   private configurationFileHash!: string;
-  private bootNotificationRequest!: BootNotificationRequest;
   private connectorsConfigurationHash!: string;
   private ocppIncomingRequestService!: OCPPIncomingRequestService;
   private readonly messageBuffer: Set<string>;
   private configuredSupervisionUrl!: URL;
+  private configuredSupervisionUrlIndex!: number;
   private wsConnectionRestarted: boolean;
   private autoReconnectRetryCount: number;
-  private stopped: boolean;
   private templateFileWatcher!: fs.FSWatcher;
   private readonly sharedLRUCache: SharedLRUCache;
-  private automaticTransactionGenerator!: AutomaticTransactionGenerator;
   private webSocketPingSetInterval!: NodeJS.Timeout;
+  private readonly chargingStationWorkerBroadcastChannel: ChargingStationWorkerBroadcastChannel;
 
   constructor(index: number, templateFile: string) {
-    this.index = index;
-    this.templateFile = templateFile;
-    this.stopped = false;
+    this.started = false;
+    this.starting = false;
+    this.stopping = false;
     this.wsConnectionRestarted = false;
     this.autoReconnectRetryCount = 0;
-    this.sharedLRUCache = SharedLRUCache.getInstance();
-    this.authorizedTagsCache = AuthorizedTagsCache.getInstance();
+    this.index = index;
+    this.templateFile = templateFile;
     this.connectors = new Map<number, ConnectorStatus>();
     this.requests = new Map<string, CachedRequest>();
     this.messageBuffer = new Set<string>();
+    this.sharedLRUCache = SharedLRUCache.getInstance();
+    this.authorizedTagsCache = AuthorizedTagsCache.getInstance();
+    this.chargingStationWorkerBroadcastChannel = new ChargingStationWorkerBroadcastChannel(this);
+
     this.initialize();
   }
 
   private get wsConnectionUrl(): URL {
     return new URL(
-      (this.getSupervisionUrlOcppConfiguration()
-        ? ChargingStationConfigurationUtils.getConfigurationKey(
-            this,
-            this.getSupervisionUrlOcppKey()
-          ).value
-        : this.configuredSupervisionUrl.href) +
-        '/' +
-        this.stationInfo.chargingStationId
+      `${
+        this.getSupervisionUrlOcppConfiguration()
+          ? ChargingStationConfigurationUtils.getConfigurationKey(
+              this,
+              this.getSupervisionUrlOcppKey()
+            ).value
+          : this.configuredSupervisionUrl.href
+      }/${this.stationInfo.chargingStationId}`
     );
   }
 
@@ -148,18 +166,6 @@ export default class ChargingStation {
     );
   }
 
-  public getBootNotificationRequest(): BootNotificationRequest {
-    return this.bootNotificationRequest;
-  }
-
-  public getRandomIdTag(): string {
-    const authorizationFile = ChargingStationUtils.getAuthorizationFile(this.stationInfo);
-    const index = Math.floor(
-      Utils.secureRandom() * this.authorizedTagsCache.getAuthorizedTags(authorizationFile).length
-    );
-    return this.authorizedTagsCache.getAuthorizedTags(authorizationFile)[index];
-  }
-
   public hasAuthorizedTags(): boolean {
     return !Utils.isEmptyArray(
       this.authorizedTagsCache.getAuthorizedTags(
@@ -168,17 +174,15 @@ export default class ChargingStation {
     );
   }
 
-  public getEnableStatistics(): boolean | undefined {
-    return !Utils.isUndefined(this.stationInfo.enableStatistics)
-      ? this.stationInfo.enableStatistics
-      : true;
+  public getEnableStatistics(): boolean {
+    return this.stationInfo.enableStatistics ?? false;
   }
 
-  public getMayAuthorizeAtRemoteStart(): boolean | undefined {
-    return this.stationInfo.mayAuthorizeAtRemoteStart ?? true;
+  public getMustAuthorizeAtRemoteStart(): boolean {
+    return this.stationInfo.mustAuthorizeAtRemoteStart ?? true;
   }
 
-  public getPayloadSchemaValidation(): boolean | undefined {
+  public getPayloadSchemaValidation(): boolean {
     return this.stationInfo.payloadSchemaValidation ?? true;
   }
 
@@ -198,7 +202,7 @@ export default class ChargingStation {
     return this?.wsConnection?.readyState === WebSocket.OPEN;
   }
 
-  public getRegistrationStatus(): RegistrationStatus {
+  public getRegistrationStatus(): RegistrationStatusEnumType {
     return this?.bootNotificationResponse?.status;
   }
 
@@ -207,19 +211,22 @@ export default class ChargingStation {
   }
 
   public isInPendingState(): boolean {
-    return this?.bootNotificationResponse?.status === RegistrationStatus.PENDING;
+    return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.PENDING;
   }
 
   public isInAcceptedState(): boolean {
-    return this?.bootNotificationResponse?.status === RegistrationStatus.ACCEPTED;
+    return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.ACCEPTED;
   }
 
   public isInRejectedState(): boolean {
-    return this?.bootNotificationResponse?.status === RegistrationStatus.REJECTED;
+    return this?.bootNotificationResponse?.status === RegistrationStatusEnumType.REJECTED;
   }
 
   public isRegistered(): boolean {
-    return !this.isInUnknownState() && (this.isInAcceptedState() || this.isInPendingState());
+    return (
+      this.isInUnknownState() === false &&
+      (this.isInAcceptedState() === true || this.isInPendingState() === true)
+    );
   }
 
   public isChargingStationAvailable(): boolean {
@@ -234,7 +241,7 @@ export default class ChargingStation {
     return this.connectors.get(0) ? this.connectors.size - 1 : this.connectors.size;
   }
 
-  public getConnectorStatus(id: number): ConnectorStatus {
+  public getConnectorStatus(id: number): ConnectorStatus | undefined {
     return this.connectors.get(id);
   }
 
@@ -258,6 +265,11 @@ export default class ChargingStation {
       : defaultVoltageOut;
   }
 
+  public getMaximumPower(stationInfo?: ChargingStationInfo): number {
+    const localStationInfo = stationInfo ?? this.stationInfo;
+    return (localStationInfo['maxPower'] as number) ?? localStationInfo.maximumPower;
+  }
+
   public getConnectorMaximumAvailablePower(connectorId: number): number {
     let connectorAmperageLimitationPowerLimit: number;
     if (
@@ -275,13 +287,14 @@ export default class ChargingStation {
         this.powerDivider;
     }
     const connectorMaximumPower = this.getMaximumPower() / this.powerDivider;
-    const connectorChargingProfilePowerLimit = this.getChargingProfilePowerLimit(connectorId);
+    const connectorChargingProfilesPowerLimit =
+      ChargingStationUtils.getChargingStationConnectorChargingProfilesPowerLimit(this, connectorId);
     return Math.min(
       isNaN(connectorMaximumPower) ? Infinity : connectorMaximumPower,
       isNaN(connectorAmperageLimitationPowerLimit)
         ? Infinity
         : connectorAmperageLimitationPowerLimit,
-      isNaN(connectorChargingProfilePowerLimit) ? Infinity : connectorChargingProfilePowerLimit
+      isNaN(connectorChargingProfilesPowerLimit) ? Infinity : connectorChargingProfilesPowerLimit
     );
   }
 
@@ -332,22 +345,18 @@ export default class ChargingStation {
     }
   }
 
-  public getEnergyActiveImportRegisterByTransactionId(transactionId: number): number | undefined {
-    const transactionConnectorStatus = this.getConnectorStatus(
-      this.getConnectorIdByTransactionId(transactionId)
+  public getEnergyActiveImportRegisterByTransactionId(
+    transactionId: number,
+    rounded = false
+  ): number {
+    return this.getEnergyActiveImportRegister(
+      this.getConnectorStatus(this.getConnectorIdByTransactionId(transactionId)),
+      rounded
     );
-    if (this.getMeteringPerTransaction()) {
-      return transactionConnectorStatus?.transactionEnergyActiveImportRegisterValue;
-    }
-    return transactionConnectorStatus?.energyActiveImportRegisterValue;
   }
 
-  public getEnergyActiveImportRegisterByConnectorId(connectorId: number): number | undefined {
-    const connectorStatus = this.getConnectorStatus(connectorId);
-    if (this.getMeteringPerTransaction()) {
-      return connectorStatus?.transactionEnergyActiveImportRegisterValue;
-    }
-    return connectorStatus?.energyActiveImportRegisterValue;
+  public getEnergyActiveImportRegisterByConnectorId(connectorId: number, rounded = false): number {
+    return this.getEnergyActiveImportRegister(this.getConnectorStatus(connectorId), rounded);
   }
 
   public getAuthorizeRemoteTxRequests(): boolean {
@@ -374,23 +383,26 @@ export default class ChargingStation {
       this.getHeartbeatInterval() > 0 &&
       !this.heartbeatSetInterval
     ) {
-      // eslint-disable-next-line @typescript-eslint/no-misused-promises
-      this.heartbeatSetInterval = setInterval(async (): Promise<void> => {
-        await this.ocppRequestService.requestHandler<HeartbeatRequest, HeartbeatResponse>(
-          this,
-          RequestCommand.HEARTBEAT
-        );
+      this.heartbeatSetInterval = setInterval(() => {
+        this.ocppRequestService
+          .requestHandler<HeartbeatRequest, HeartbeatResponse>(this, RequestCommand.HEARTBEAT)
+          .catch((error) => {
+            logger.error(
+              `${this.logPrefix()} Error while sending '${RequestCommand.HEARTBEAT}':`,
+              error
+            );
+          });
       }, this.getHeartbeatInterval());
       logger.info(
-        this.logPrefix() +
-          ' Heartbeat started every ' +
-          Utils.formatDurationMilliSeconds(this.getHeartbeatInterval())
+        `${this.logPrefix()} Heartbeat started every ${Utils.formatDurationMilliSeconds(
+          this.getHeartbeatInterval()
+        )}`
       );
     } else if (this.heartbeatSetInterval) {
       logger.info(
-        this.logPrefix() +
-          ' Heartbeat already started every ' +
-          Utils.formatDurationMilliSeconds(this.getHeartbeatInterval())
+        `${this.logPrefix()} Heartbeat already started every ${Utils.formatDurationMilliSeconds(
+          this.getHeartbeatInterval()
+        )}`
       );
     } else {
       logger.error(
@@ -430,13 +442,13 @@ export default class ChargingStation {
       );
       return;
     }
-    if (!this.getConnectorStatus(connectorId)?.transactionStarted) {
+    if (this.getConnectorStatus(connectorId)?.transactionStarted === false) {
       logger.error(
         `${this.logPrefix()} Trying to start MeterValues on connector Id ${connectorId} with no transaction started`
       );
       return;
     } else if (
-      this.getConnectorStatus(connectorId)?.transactionStarted &&
+      this.getConnectorStatus(connectorId)?.transactionStarted === true &&
       !this.getConnectorStatus(connectorId)?.transactionId
     ) {
       logger.error(
@@ -445,18 +457,16 @@ export default class ChargingStation {
       return;
     }
     if (interval > 0) {
-      // eslint-disable-next-line @typescript-eslint/no-misused-promises
-      this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(
-        // eslint-disable-next-line @typescript-eslint/no-misused-promises
-        async (): Promise<void> => {
-          // FIXME: Implement OCPP version agnostic helpers
-          const meterValue: MeterValue = OCPP16ServiceUtils.buildMeterValue(
-            this,
-            connectorId,
-            this.getConnectorStatus(connectorId).transactionId,
-            interval
-          );
-          await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
+      this.getConnectorStatus(connectorId).transactionSetInterval = setInterval(() => {
+        // FIXME: Implement OCPP version agnostic helpers
+        const meterValue: MeterValue = OCPP16ServiceUtils.buildMeterValue(
+          this,
+          connectorId,
+          this.getConnectorStatus(connectorId).transactionId,
+          interval
+        );
+        this.ocppRequestService
+          .requestHandler<MeterValuesRequest, MeterValuesResponse>(
             this,
             RequestCommand.METER_VALUES,
             {
@@ -464,10 +474,14 @@ export default class ChargingStation {
               transactionId: this.getConnectorStatus(connectorId).transactionId,
               meterValue: [meterValue],
             }
-          );
-        },
-        interval
-      );
+          )
+          .catch((error) => {
+            logger.error(
+              `${this.logPrefix()} Error while sending '${RequestCommand.METER_VALUES}':`,
+              error
+            );
+          });
+      }, interval);
     } else {
       logger.error(
         `${this.logPrefix()} Charging station ${
@@ -480,80 +494,85 @@ export default class ChargingStation {
   }
 
   public start(): void {
-    if (this.getEnableStatistics()) {
-      this.performanceStatistics.start();
-    }
-    this.openWSConnection();
-    // Monitor charging station template file
-    this.templateFileWatcher = FileUtils.watchJsonFile(
-      this.logPrefix(),
-      FileType.ChargingStationTemplate,
-      this.templateFile,
-      null,
-      (event, filename): void => {
-        if (filename && event === 'change') {
-          try {
-            logger.debug(
-              `${this.logPrefix()} ${FileType.ChargingStationTemplate} ${
-                this.templateFile
-              } file have changed, reload`
-            );
-            this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
-            // Initialize
-            this.initialize();
-            // Restart the ATG
-            this.stopAutomaticTransactionGenerator();
-            this.startAutomaticTransactionGenerator();
-            if (this.getEnableStatistics()) {
-              this.performanceStatistics.restart();
-            } else {
-              this.performanceStatistics.stop();
+    if (this.started === false) {
+      if (this.starting === false) {
+        this.starting = true;
+        if (this.getEnableStatistics() === true) {
+          this.performanceStatistics.start();
+        }
+        this.openWSConnection();
+        // Monitor charging station template file
+        this.templateFileWatcher = FileUtils.watchJsonFile(
+          this.logPrefix(),
+          FileType.ChargingStationTemplate,
+          this.templateFile,
+          null,
+          (event, filename): void => {
+            if (filename && event === 'change') {
+              try {
+                logger.debug(
+                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} ${
+                    this.templateFile
+                  } file have changed, reload`
+                );
+                this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
+                // Initialize
+                this.initialize();
+                // Restart the ATG
+                this.stopAutomaticTransactionGenerator();
+                if (
+                  this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true
+                ) {
+                  this.startAutomaticTransactionGenerator();
+                }
+                if (this.getEnableStatistics() === true) {
+                  this.performanceStatistics.restart();
+                } else {
+                  this.performanceStatistics.stop();
+                }
+                // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
+              } catch (error) {
+                logger.error(
+                  `${this.logPrefix()} ${FileType.ChargingStationTemplate} file monitoring error:`,
+                  error
+                );
+              }
             }
-            // FIXME?: restart heartbeat and WebSocket ping when their interval values have changed
-          } catch (error) {
-            logger.error(
-              `${this.logPrefix()} ${FileType.ChargingStationTemplate} file monitoring error: %j`,
-              error
-            );
           }
-        }
+        );
+        this.started = true;
+        parentPort.postMessage(MessageChannelUtils.buildStartedMessage(this));
+        this.starting = false;
+      } else {
+        logger.warn(`${this.logPrefix()} Charging station is already starting...`);
       }
-    );
-    parentPort.postMessage({
-      id: ChargingStationWorkerMessageEvents.STARTED,
-      data: { id: this.stationInfo.chargingStationId },
-    });
+    } else {
+      logger.warn(`${this.logPrefix()} Charging station is already started...`);
+    }
   }
 
-  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.requestHandler<
-          StatusNotificationRequest,
-          StatusNotificationResponse
-        >(this, RequestCommand.STATUS_NOTIFICATION, {
-          connectorId,
-          status: ChargePointStatus.UNAVAILABLE,
-          errorCode: ChargePointErrorCode.NO_ERROR,
-        });
-        this.getConnectorStatus(connectorId).status = ChargePointStatus.UNAVAILABLE;
+  public async stop(reason?: StopTransactionReason): Promise<void> {
+    if (this.started === true) {
+      if (this.stopping === false) {
+        this.stopping = true;
+        await this.stopMessageSequence(reason);
+        this.closeWSConnection();
+        if (this.getEnableStatistics() === true) {
+          this.performanceStatistics.stop();
+        }
+        this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
+        this.templateFileWatcher.close();
+        this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
+        this.bootNotificationResponse = null;
+        this.started = false;
+        parentPort.postMessage(MessageChannelUtils.buildStoppedMessage(this));
+        this.stopping = false;
+      } else {
+        logger.warn(`${this.logPrefix()} Charging station is already stopping...`);
       }
+    } else {
+      logger.warn(`${this.logPrefix()} Charging station is already stopped...`);
     }
-    this.closeWSConnection();
-    if (this.getEnableStatistics()) {
-      this.performanceStatistics.stop();
-    }
-    this.sharedLRUCache.deleteChargingStationConfiguration(this.configurationFileHash);
-    this.templateFileWatcher.close();
-    this.sharedLRUCache.deleteChargingStationTemplate(this.stationInfo?.templateHash);
-    this.bootNotificationResponse = null;
-    parentPort.postMessage({
-      id: ChargingStationWorkerMessageEvents.STOPPED,
-      data: { id: this.stationInfo.chargingStationId },
-    });
-    this.stopped = true;
   }
 
   public async reset(reason?: StopTransactionReason): Promise<void> {
@@ -569,89 +588,6 @@ export default class ChargingStation {
     }
   }
 
-  public getChargingProfilePowerLimit(connectorId: number): number | undefined {
-    let limit: number, matchingChargingProfile: ChargingProfile;
-    let chargingProfiles: ChargingProfile[] = [];
-    // Get charging profiles for connector and sort by stack level
-    chargingProfiles = this.getConnectorStatus(connectorId).chargingProfiles.sort(
-      (a, b) => b.stackLevel - a.stackLevel
-    );
-    // Get profiles on connector 0
-    if (this.getConnectorStatus(0).chargingProfiles) {
-      chargingProfiles.push(
-        ...this.getConnectorStatus(0).chargingProfiles.sort((a, b) => b.stackLevel - a.stackLevel)
-      );
-    }
-    if (!Utils.isEmptyArray(chargingProfiles)) {
-      const result = ChargingStationUtils.getLimitFromChargingProfiles(
-        chargingProfiles,
-        Utils.logPrefix()
-      );
-      if (!Utils.isNullOrUndefined(result)) {
-        limit = result.limit;
-        matchingChargingProfile = result.matchingChargingProfile;
-        switch (this.getCurrentOutType()) {
-          case CurrentType.AC:
-            limit =
-              matchingChargingProfile.chargingSchedule.chargingRateUnit ===
-              ChargingRateUnitType.WATT
-                ? limit
-                : ACElectricUtils.powerTotal(this.getNumberOfPhases(), this.getVoltageOut(), limit);
-            break;
-          case CurrentType.DC:
-            limit =
-              matchingChargingProfile.chargingSchedule.chargingRateUnit ===
-              ChargingRateUnitType.WATT
-                ? limit
-                : DCElectricUtils.power(this.getVoltageOut(), limit);
-        }
-
-        const connectorMaximumPower = this.getMaximumPower() / this.powerDivider;
-        if (limit > connectorMaximumPower) {
-          logger.error(
-            `${this.logPrefix()} Charging profile id ${
-              matchingChargingProfile.chargingProfileId
-            } limit is greater than connector id ${connectorId} maximum, dump charging profiles' stack: %j`,
-            this.getConnectorStatus(connectorId).chargingProfiles
-          );
-          limit = connectorMaximumPower;
-        }
-      }
-    }
-    return limit;
-  }
-
-  public setChargingProfile(connectorId: number, cp: ChargingProfile): void {
-    if (Utils.isNullOrUndefined(this.getConnectorStatus(connectorId).chargingProfiles)) {
-      logger.error(
-        `${this.logPrefix()} Trying to set a charging profile on connectorId ${connectorId} with an uninitialized charging profiles array attribute, applying deferred initialization`
-      );
-      this.getConnectorStatus(connectorId).chargingProfiles = [];
-    }
-    if (!Array.isArray(this.getConnectorStatus(connectorId).chargingProfiles)) {
-      logger.error(
-        `${this.logPrefix()} Trying to set a charging profile on connectorId ${connectorId} with an improper attribute type for the charging profiles array, applying proper type initialization`
-      );
-      this.getConnectorStatus(connectorId).chargingProfiles = [];
-    }
-    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);
-  }
-
   public resetConnectorStatus(connectorId: number): void {
     this.getConnectorStatus(connectorId).idTagLocalAuthorized = false;
     this.getConnectorStatus(connectorId).idTagAuthorized = false;
@@ -664,9 +600,10 @@ export default class ChargingStation {
     this.getConnectorStatus(connectorId).transactionEnergyActiveImportRegisterValue = 0;
     delete this.getConnectorStatus(connectorId).transactionBeginMeterValue;
     this.stopMeterValues(connectorId);
+    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
   }
 
-  public hasFeatureProfile(featureProfile: SupportedFeatureProfiles) {
+  public hasFeatureProfile(featureProfile: SupportedFeatureProfiles): boolean {
     return ChargingStationConfigurationUtils.getConfigurationKey(
       this,
       StandardParametersKey.SupportedFeatureProfiles
@@ -677,11 +614,175 @@ export default class ChargingStation {
     this.messageBuffer.add(message);
   }
 
-  private flushMessageBuffer() {
+  public openWSConnection(
+    options: WsOptions = this.stationInfo?.wsOptions ?? {},
+    params: { closeOpened?: boolean; terminateOpened?: boolean } = {
+      closeOpened: false,
+      terminateOpened: false,
+    }
+  ): void {
+    options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
+    params.closeOpened = params?.closeOpened ?? false;
+    params.terminateOpened = params?.terminateOpened ?? false;
+    if (this.started === false && this.starting === false) {
+      logger.warn(
+        `${this.logPrefix()} Cannot open OCPP connection to URL ${this.wsConnectionUrl.toString()} on stopped charging station`
+      );
+      return;
+    }
+    if (
+      !Utils.isNullOrUndefined(this.stationInfo.supervisionUser) &&
+      !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)
+    ) {
+      options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
+    }
+    if (params?.closeOpened) {
+      this.closeWSConnection();
+    }
+    if (params?.terminateOpened) {
+      this.terminateWSConnection();
+    }
+    const ocppVersion = this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16;
+    let protocol: string;
+    switch (ocppVersion) {
+      case OCPPVersion.VERSION_16:
+      case OCPPVersion.VERSION_20:
+      case OCPPVersion.VERSION_201:
+        protocol = `ocpp${ocppVersion}`;
+        break;
+      default:
+        this.handleUnsupportedVersion(ocppVersion);
+        break;
+    }
+
+    if (this.isWebSocketConnectionOpened() === true) {
+      logger.warn(
+        `${this.logPrefix()} OCPP connection to URL ${this.wsConnectionUrl.toString()} is already opened`
+      );
+      return;
+    }
+
+    logger.info(
+      `${this.logPrefix()} Open OCPP connection to URL ${this.wsConnectionUrl.toString()}`
+    );
+
+    this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
+
+    // Handle WebSocket message
+    this.wsConnection.on(
+      'message',
+      this.onMessage.bind(this) as (this: WebSocket, data: RawData, isBinary: boolean) => void
+    );
+    // Handle WebSocket error
+    this.wsConnection.on(
+      'error',
+      this.onError.bind(this) as (this: WebSocket, error: Error) => void
+    );
+    // Handle WebSocket close
+    this.wsConnection.on(
+      'close',
+      this.onClose.bind(this) as (this: WebSocket, code: number, reason: Buffer) => void
+    );
+    // Handle WebSocket open
+    this.wsConnection.on('open', this.onOpen.bind(this) as (this: WebSocket) => void);
+    // Handle WebSocket ping
+    this.wsConnection.on('ping', this.onPing.bind(this) as (this: WebSocket, data: Buffer) => void);
+    // Handle WebSocket pong
+    this.wsConnection.on('pong', this.onPong.bind(this) as (this: WebSocket, data: Buffer) => void);
+  }
+
+  public closeWSConnection(): void {
+    if (this.isWebSocketConnectionOpened() === true) {
+      this.wsConnection.close();
+      this.wsConnection = null;
+    }
+  }
+
+  public startAutomaticTransactionGenerator(
+    connectorIds?: number[],
+    automaticTransactionGeneratorConfiguration?: AutomaticTransactionGeneratorConfiguration
+  ): void {
+    this.automaticTransactionGenerator = AutomaticTransactionGenerator.getInstance(
+      automaticTransactionGeneratorConfiguration ??
+        this.getAutomaticTransactionGeneratorConfigurationFromTemplate(),
+      this
+    );
+    if (!Utils.isEmptyArray(connectorIds)) {
+      for (const connectorId of connectorIds) {
+        this.automaticTransactionGenerator.startConnector(connectorId);
+      }
+    } else {
+      this.automaticTransactionGenerator.start();
+    }
+    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
+  }
+
+  public stopAutomaticTransactionGenerator(connectorIds?: number[]): void {
+    if (!Utils.isEmptyArray(connectorIds)) {
+      for (const connectorId of connectorIds) {
+        this.automaticTransactionGenerator?.stopConnector(connectorId);
+      }
+    } else {
+      this.automaticTransactionGenerator?.stop();
+    }
+    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
+  }
+
+  public async stopTransactionOnConnector(
+    connectorId: number,
+    reason = StopTransactionReason.NONE
+  ): Promise<StopTransactionResponse> {
+    const transactionId = this.getConnectorStatus(connectorId).transactionId;
+    if (
+      this.getBeginEndMeterValues() === true &&
+      this.getOcppStrictCompliance() === true &&
+      this.getOutOfOrderEndMeterValues() === false
+    ) {
+      // FIXME: Implement OCPP version agnostic helpers
+      const transactionEndMeterValue = OCPP16ServiceUtils.buildTransactionEndMeterValue(
+        this,
+        connectorId,
+        this.getEnergyActiveImportRegisterByTransactionId(transactionId)
+      );
+      await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
+        this,
+        RequestCommand.METER_VALUES,
+        {
+          connectorId,
+          transactionId,
+          meterValue: [transactionEndMeterValue],
+        }
+      );
+    }
+    return this.ocppRequestService.requestHandler<StopTransactionRequest, StopTransactionResponse>(
+      this,
+      RequestCommand.STOP_TRANSACTION,
+      {
+        transactionId,
+        meterStop: this.getEnergyActiveImportRegisterByTransactionId(transactionId, true),
+        reason,
+      }
+    );
+  }
+
+  private flushMessageBuffer(): void {
     if (this.messageBuffer.size > 0) {
       this.messageBuffer.forEach((message) => {
-        // TODO: evaluate the need to track performance
+        let beginId: string;
+        let commandName: RequestCommand;
+        const [messageType] = JSON.parse(message) as OutgoingRequest | Response | ErrorResponse;
+        const isRequest = messageType === MessageType.CALL_MESSAGE;
+        if (isRequest) {
+          [, , commandName] = JSON.parse(message) as OutgoingRequest;
+          beginId = PerformanceStatistics.beginMeasure(commandName);
+        }
         this.wsConnection.send(message);
+        isRequest && PerformanceStatistics.endMeasure(commandName, beginId);
+        logger.debug(
+          `${this.logPrefix()} >> Buffered ${OCPPServiceUtils.getMessageTypeString(
+            messageType
+          )} payload sent: ${message}`
+        );
         this.messageBuffer.delete(message);
       });
     }
@@ -727,7 +828,7 @@ export default class ChargingStation {
   private getStationInfoFromTemplate(): ChargingStationInfo {
     const stationTemplate: ChargingStationTemplate = this.getTemplateFromFile();
     if (Utils.isNullOrUndefined(stationTemplate)) {
-      const errorMsg = 'Failed to read charging station template file';
+      const errorMsg = `Failed to read charging station template file ${this.templateFile}`;
       logger.error(`${this.logPrefix()} ${errorMsg}`);
       throw new BaseError(errorMsg);
     }
@@ -751,10 +852,12 @@ export default class ChargingStation {
     );
     const stationInfo: ChargingStationInfo =
       ChargingStationUtils.stationTemplateToStationInfo(stationTemplate);
+    stationInfo.hashId = ChargingStationUtils.getHashId(this.index, stationTemplate);
     stationInfo.chargingStationId = ChargingStationUtils.getChargingStationId(
       this.index,
       stationTemplate
     );
+    stationInfo.ocppVersion = stationTemplate.ocppVersion ?? OCPPVersion.VERSION_16;
     ChargingStationUtils.createSerialNumber(stationTemplate, stationInfo);
     if (!Utils.isEmptyArray(stationTemplate.power)) {
       stationTemplate.power = stationTemplate.power as number[];
@@ -770,24 +873,40 @@ export default class ChargingStation {
           ? stationTemplate.power * 1000
           : stationTemplate.power;
     }
+    stationInfo.firmwareVersionPattern =
+      stationTemplate.firmwareVersionPattern ?? Constants.SEMVER_PATTERN;
+    if (
+      stationInfo.firmwareVersion &&
+      new RegExp(stationInfo.firmwareVersionPattern).test(stationInfo.firmwareVersion) === false
+    ) {
+      logger.warn(
+        `${this.logPrefix()} Firmware version '${stationInfo.firmwareVersion}' in template file ${
+          this.templateFile
+        } does not match firmware version pattern '${stationInfo.firmwareVersionPattern}'`
+      );
+    }
+    stationInfo.firmwareUpgrade = merge(
+      {
+        reset: true,
+      },
+      stationTemplate.firmwareUpgrade ?? {}
+    );
     stationInfo.resetTime = stationTemplate.resetTime
       ? stationTemplate.resetTime * 1000
       : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
-    const configuredMaxConnectors = ChargingStationUtils.getConfiguredNumberOfConnectors(
-      this.index,
-      stationTemplate
-    );
+    const configuredMaxConnectors =
+      ChargingStationUtils.getConfiguredNumberOfConnectors(stationTemplate);
     ChargingStationUtils.checkConfiguredMaxConnectors(
       configuredMaxConnectors,
       this.templateFile,
-      Utils.logPrefix()
+      this.logPrefix()
     );
     const templateMaxConnectors =
       ChargingStationUtils.getTemplateMaxNumberOfConnectors(stationTemplate);
     ChargingStationUtils.checkTemplateMaxConnectors(
       templateMaxConnectors,
       this.templateFile,
-      Utils.logPrefix()
+      this.logPrefix()
     );
     if (
       configuredMaxConnectors >
@@ -841,10 +960,6 @@ export default class ChargingStation {
     }
   }
 
-  private getOcppVersion(): OCPPVersion {
-    return this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16;
-  }
-
   private getOcppPersistentConfiguration(): boolean {
     return this.stationInfo?.ocppPersistentConfiguration ?? true;
   }
@@ -854,28 +969,24 @@ export default class ChargingStation {
   }
 
   private handleUnsupportedVersion(version: OCPPVersion) {
-    const errMsg = `${this.logPrefix()} Unsupported protocol version '${version}' configured in template file ${
-      this.templateFile
-    }`;
-    logger.error(errMsg);
-    throw new Error(errMsg);
+    const errMsg = `Unsupported protocol version '${version}' configured in template file ${this.templateFile}`;
+    logger.error(`${this.logPrefix()} ${errMsg}`);
+    throw new BaseError(errMsg);
   }
 
   private initialize(): void {
-    this.hashId = ChargingStationUtils.getHashId(this.index, this.getTemplateFromFile());
-    logger.info(`${this.logPrefix()} Charging station hashId '${this.hashId}'`);
     this.configurationFile = path.join(
       path.dirname(this.templateFile.replace('station-templates', 'configurations')),
-      this.hashId + '.json'
+      `${ChargingStationUtils.getHashId(this.index, this.getTemplateFromFile())}.json`
     );
     this.stationInfo = this.getStationInfo();
     this.saveStationInfo();
     // Avoid duplication of connectors related information in RAM
     this.stationInfo?.Connectors && delete this.stationInfo.Connectors;
     this.configuredSupervisionUrl = this.getConfiguredSupervisionUrl();
-    if (this.getEnableStatistics()) {
+    if (this.getEnableStatistics() === true) {
       this.performanceStatistics = PerformanceStatistics.getInstance(
-        this.hashId,
+        this.stationInfo.hashId,
         this.stationInfo.chargingStationId,
         this.configuredSupervisionUrl
       );
@@ -887,7 +998,8 @@ export default class ChargingStation {
     // OCPP configuration
     this.ocppConfiguration = this.getOcppConfiguration();
     this.initializeOcppConfiguration();
-    switch (this.getOcppVersion()) {
+    const ocppVersion = this.stationInfo.ocppVersion ?? OCPPVersion.VERSION_16;
+    switch (ocppVersion) {
       case OCPPVersion.VERSION_16:
         this.ocppIncomingRequestService =
           OCPP16IncomingRequestService.getInstance<OCPP16IncomingRequestService>();
@@ -895,17 +1007,43 @@ export default class ChargingStation {
           OCPP16ResponseService.getInstance<OCPP16ResponseService>()
         );
         break;
+      case OCPPVersion.VERSION_20:
+      case OCPPVersion.VERSION_201:
+        this.ocppIncomingRequestService =
+          OCPP20IncomingRequestService.getInstance<OCPP20IncomingRequestService>();
+        this.ocppRequestService = OCPP20RequestService.getInstance<OCPP20RequestService>(
+          OCPP20ResponseService.getInstance<OCPP20ResponseService>()
+        );
+        break;
       default:
-        this.handleUnsupportedVersion(this.getOcppVersion());
+        this.handleUnsupportedVersion(ocppVersion);
         break;
     }
-    if (this.stationInfo?.autoRegister) {
+    if (this.stationInfo?.autoRegister === true) {
       this.bootNotificationResponse = {
-        currentTime: new Date().toISOString(),
+        currentTime: new Date(),
         interval: this.getHeartbeatInterval() / 1000,
-        status: RegistrationStatus.ACCEPTED,
+        status: RegistrationStatusEnumType.ACCEPTED,
       };
     }
+    if (
+      this.stationInfo.firmwareStatus === FirmwareStatus.Installing &&
+      this.stationInfo.firmwareVersion &&
+      this.stationInfo.firmwareVersionPattern
+    ) {
+      const versionStep = this.stationInfo.firmwareUpgrade?.versionUpgrade?.step ?? 1;
+      const patternGroup: number =
+        this.stationInfo.firmwareUpgrade?.versionUpgrade?.patternGroup ??
+        this.stationInfo.firmwareVersion.split('.').length;
+      const match = this.stationInfo.firmwareVersion
+        .match(new RegExp(this.stationInfo.firmwareVersionPattern))
+        .slice(1, patternGroup + 1);
+      const patchLevelIndex = match.length - 1;
+      match[patchLevelIndex] = (
+        Utils.convertToInt(match[patchLevelIndex]) + versionStep
+      ).toString();
+      this.stationInfo.firmwareVersion = match.join('.');
+    }
   }
 
   private initializeOcppConfiguration(): void {
@@ -1076,10 +1214,8 @@ export default class ChargingStation {
     templateMaxConnectors: number
   ): void {
     if (!stationInfo?.Connectors && this.connectors.size === 0) {
-      const logMsg = `${this.logPrefix()} No already defined connectors and charging station information from template ${
-        this.templateFile
-      } with no connectors configuration defined`;
-      logger.error(logMsg);
+      const logMsg = `No already defined connectors and charging station information from template ${this.templateFile} with no connectors configuration defined`;
+      logger.error(`${this.logPrefix()} ${logMsg}`);
       throw new BaseError(logMsg);
     }
     if (!stationInfo?.Connectors[0]) {
@@ -1102,15 +1238,17 @@ export default class ChargingStation {
         // Add connector Id 0
         let lastConnector = '0';
         for (lastConnector in stationInfo?.Connectors) {
+          const connectorStatus = stationInfo?.Connectors[lastConnector];
           const lastConnectorId = Utils.convertToInt(lastConnector);
           if (
             lastConnectorId === 0 &&
-            this.getUseConnectorId0(stationInfo) &&
-            stationInfo?.Connectors[lastConnector]
+            this.getUseConnectorId0(stationInfo) === true &&
+            connectorStatus
           ) {
+            this.checkStationInfoConnectorStatus(lastConnectorId, connectorStatus);
             this.connectors.set(
               lastConnectorId,
-              Utils.cloneObject<ConnectorStatus>(stationInfo?.Connectors[lastConnector])
+              Utils.cloneObject<ConnectorStatus>(connectorStatus)
             );
             this.getConnectorStatus(lastConnectorId).availability = AvailabilityType.OPERATIVE;
             if (Utils.isUndefined(this.getConnectorStatus(lastConnectorId)?.chargingProfiles)) {
@@ -1124,10 +1262,9 @@ export default class ChargingStation {
             const randConnectorId = stationInfo?.randomConnectors
               ? Utils.getRandomInteger(Utils.convertToInt(lastConnector), 1)
               : index;
-            this.connectors.set(
-              index,
-              Utils.cloneObject<ConnectorStatus>(stationInfo?.Connectors[randConnectorId])
-            );
+            const connectorStatus = stationInfo?.Connectors[randConnectorId.toString()];
+            this.checkStationInfoConnectorStatus(randConnectorId, connectorStatus);
+            this.connectors.set(index, Utils.cloneObject<ConnectorStatus>(connectorStatus));
             this.getConnectorStatus(index).availability = AvailabilityType.OPERATIVE;
             if (Utils.isUndefined(this.getConnectorStatus(index)?.chargingProfiles)) {
               this.getConnectorStatus(index).chargingProfiles = [];
@@ -1144,12 +1281,37 @@ export default class ChargingStation {
     }
     // Initialize transaction attributes on connectors
     for (const connectorId of this.connectors.keys()) {
-      if (connectorId > 0 && !this.getConnectorStatus(connectorId)?.transactionStarted) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId).transactionStarted === true) {
+        logger.warn(
+          `${this.logPrefix()} Connector ${connectorId} at initialization has a transaction started: ${
+            this.getConnectorStatus(connectorId).transactionId
+          }`
+        );
+      }
+      if (
+        connectorId > 0 &&
+        (this.getConnectorStatus(connectorId).transactionStarted === undefined ||
+          this.getConnectorStatus(connectorId).transactionStarted === null)
+      ) {
         this.initializeConnectorStatus(connectorId);
       }
     }
   }
 
+  private checkStationInfoConnectorStatus(
+    connectorId: number,
+    connectorStatus: ConnectorStatus
+  ): void {
+    if (!Utils.isNullOrUndefined(connectorStatus?.status)) {
+      logger.warn(
+        `${this.logPrefix()} Charging station information from template ${
+          this.templateFile
+        } with connector ${connectorId} status configuration defined, undefine it`
+      );
+      connectorStatus.status = undefined;
+    }
+  }
+
   private getConfigurationFromFile(): ChargingStationConfiguration | null {
     let configuration: ChargingStationConfiguration = null;
     if (this.configurationFile && fs.existsSync(this.configurationFile)) {
@@ -1235,7 +1397,7 @@ export default class ChargingStation {
 
   private getOcppConfigurationFromFile(): ChargingStationOcppConfiguration | null {
     let configuration: ChargingStationConfiguration = null;
-    if (this.getOcppPersistentConfiguration()) {
+    if (this.getOcppPersistentConfiguration() === true) {
       const configurationFromFile = this.getConfigurationFromFile();
       configuration = configurationFromFile?.configurationKey && configurationFromFile;
     }
@@ -1252,34 +1414,21 @@ export default class ChargingStation {
   }
 
   private async onOpen(): Promise<void> {
-    if (this.isWebSocketConnectionOpened()) {
+    if (this.isWebSocketConnectionOpened() === true) {
       logger.info(
         `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} succeeded`
       );
-      if (!this.isRegistered()) {
+      if (this.isRegistered() === false) {
         // Send BootNotification
         let registrationRetryCount = 0;
         do {
           this.bootNotificationResponse = await this.ocppRequestService.requestHandler<
             BootNotificationRequest,
             BootNotificationResponse
-          >(
-            this,
-            RequestCommand.BOOT_NOTIFICATION,
-            {
-              chargePointModel: this.bootNotificationRequest.chargePointModel,
-              chargePointVendor: this.bootNotificationRequest.chargePointVendor,
-              chargeBoxSerialNumber: this.bootNotificationRequest.chargeBoxSerialNumber,
-              firmwareVersion: this.bootNotificationRequest.firmwareVersion,
-              chargePointSerialNumber: this.bootNotificationRequest.chargePointSerialNumber,
-              iccid: this.bootNotificationRequest.iccid,
-              imsi: this.bootNotificationRequest.imsi,
-              meterSerialNumber: this.bootNotificationRequest.meterSerialNumber,
-              meterType: this.bootNotificationRequest.meterType,
-            },
-            { skipBufferingOnError: true }
-          );
-          if (!this.isRegistered()) {
+          >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
+            skipBufferingOnError: true,
+          });
+          if (this.isRegistered() === false) {
             this.getRegistrationMaxRetries() !== -1 && registrationRetryCount++;
             await Utils.sleep(
               this.bootNotificationResponse?.interval
@@ -1288,24 +1437,23 @@ export default class ChargingStation {
             );
           }
         } while (
-          !this.isRegistered() &&
+          this.isRegistered() === false &&
           (registrationRetryCount <= this.getRegistrationMaxRetries() ||
             this.getRegistrationMaxRetries() === -1)
         );
       }
-      if (this.isRegistered()) {
-        if (this.isInAcceptedState()) {
+      if (this.isRegistered() === true) {
+        if (this.isInAcceptedState() === true) {
           await this.startMessageSequence();
-          this.wsConnectionRestarted && this.flushMessageBuffer();
         }
       } else {
         logger.error(
           `${this.logPrefix()} Registration failure: max retries reached (${this.getRegistrationMaxRetries()}) or retry disabled (${this.getRegistrationMaxRetries()})`
         );
       }
-      this.stopped && (this.stopped = false);
-      this.autoReconnectRetryCount = 0;
       this.wsConnectionRestarted = false;
+      this.autoReconnectRetryCount = 0;
+      parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
     } else {
       logger.warn(
         `${this.logPrefix()} Connection to OCPP server through ${this.wsConnectionUrl.toString()} failed`
@@ -1313,31 +1461,32 @@ export default class ChargingStation {
     }
   }
 
-  private async onClose(code: number, reason: string): Promise<void> {
+  private async onClose(code: number, reason: Buffer): Promise<void> {
     switch (code) {
       // Normal close
       case WebSocketCloseEventStatusCode.CLOSE_NORMAL:
       case WebSocketCloseEventStatusCode.CLOSE_NO_STATUS:
         logger.info(
-          `${this.logPrefix()} WebSocket normally closed with status '${ChargingStationUtils.getWebSocketCloseEventStatusString(
+          `${this.logPrefix()} WebSocket normally closed with status '${Utils.getWebSocketCloseEventStatusString(
             code
-          )}' and reason '${reason}'`
+          )}' and reason '${reason.toString()}'`
         );
         this.autoReconnectRetryCount = 0;
         break;
       // Abnormal close
       default:
         logger.error(
-          `${this.logPrefix()} WebSocket abnormally closed with status '${ChargingStationUtils.getWebSocketCloseEventStatusString(
+          `${this.logPrefix()} WebSocket abnormally closed with status '${Utils.getWebSocketCloseEventStatusString(
             code
-          )}' and reason '${reason}'`
+          )}' and reason '${reason.toString()}'`
         );
-        await this.reconnect(code);
+        this.started === true && (await this.reconnect());
         break;
     }
+    parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
   }
 
-  private async onMessage(data: Data): Promise<void> {
+  private async onMessage(data: RawData): Promise<void> {
     let messageType: number;
     let messageId: string;
     let commandName: IncomingRequestCommand;
@@ -1345,22 +1494,22 @@ export default class ChargingStation {
     let errorType: ErrorType;
     let errorMessage: string;
     let errorDetails: JsonType;
-    let responseCallback: (payload: JsonType, requestPayload: JsonType) => void;
-    let errorCallback: (error: OCPPError, requestStatistic?: boolean) => void;
+    let responseCallback: ResponseCallback;
+    let errorCallback: ErrorCallback;
     let requestCommandName: RequestCommand | IncomingRequestCommand;
     let requestPayload: JsonType;
     let cachedRequest: CachedRequest;
     let errMsg: string;
     try {
       const request = JSON.parse(data.toString()) as IncomingRequest | Response | ErrorResponse;
-      if (Utils.isIterable(request)) {
+      if (Array.isArray(request) === true) {
         [messageType, messageId] = request;
         // Check the type of message
         switch (messageType) {
           // Incoming Message
           case MessageType.CALL_MESSAGE:
             [, , commandName, commandPayload] = request as IncomingRequest;
-            if (this.getEnableStatistics()) {
+            if (this.getEnableStatistics() === true) {
               this.performanceStatistics.addRequestStatistic(commandName, messageType);
             }
             logger.debug(
@@ -1379,7 +1528,7 @@ export default class ChargingStation {
           // Outcome Message
           case MessageType.CALL_RESULT_MESSAGE:
             [, , commandPayload] = request as Response;
-            if (!this.requests.has(messageId)) {
+            if (this.requests.has(messageId) === false) {
               // Error
               throw new OCPPError(
                 ErrorType.INTERNAL_ERROR,
@@ -1390,19 +1539,19 @@ export default class ChargingStation {
             }
             // Respond
             cachedRequest = this.requests.get(messageId);
-            if (Utils.isIterable(cachedRequest)) {
-              [responseCallback, , requestCommandName, requestPayload] = cachedRequest;
+            if (Array.isArray(cachedRequest) === true) {
+              [responseCallback, errorCallback, requestCommandName, requestPayload] = cachedRequest;
             } else {
               throw new OCPPError(
                 ErrorType.PROTOCOL_ERROR,
-                `Cached request for message id ${messageId} response is not iterable`,
+                `Cached request for message id ${messageId} response is not an array`,
                 null,
                 cachedRequest as unknown as JsonType
               );
             }
             logger.debug(
               `${this.logPrefix()} << Command '${
-                requestCommandName ?? 'unknown'
+                requestCommandName ?? Constants.UNKNOWN_COMMAND
               }' received response payload: ${JSON.stringify(request)}`
             );
             responseCallback(commandPayload, requestPayload);
@@ -1410,7 +1559,7 @@ export default class ChargingStation {
           // Error Message
           case MessageType.CALL_ERROR_MESSAGE:
             [, , errorType, errorMessage, errorDetails] = request as ErrorResponse;
-            if (!this.requests.has(messageId)) {
+            if (this.requests.has(messageId) === false) {
               // Error
               throw new OCPPError(
                 ErrorType.INTERNAL_ERROR,
@@ -1420,79 +1569,109 @@ export default class ChargingStation {
               );
             }
             cachedRequest = this.requests.get(messageId);
-            if (Utils.isIterable(cachedRequest)) {
+            if (Array.isArray(cachedRequest) === true) {
               [, errorCallback, requestCommandName] = cachedRequest;
             } else {
               throw new OCPPError(
                 ErrorType.PROTOCOL_ERROR,
-                `Cached request for message id ${messageId} error response is not iterable`,
+                `Cached request for message id ${messageId} error response is not an array`,
                 null,
                 cachedRequest as unknown as JsonType
               );
             }
             logger.debug(
               `${this.logPrefix()} << Command '${
-                requestCommandName ?? 'unknown'
-              }' received error payload: ${JSON.stringify(request)}`
+                requestCommandName ?? Constants.UNKNOWN_COMMAND
+              }' received error response payload: ${JSON.stringify(request)}`
             );
             errorCallback(new OCPPError(errorType, errorMessage, requestCommandName, errorDetails));
             break;
           // Error
           default:
             // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
-            errMsg = `${this.logPrefix()} Wrong message type ${messageType}`;
-            logger.error(errMsg);
+            errMsg = `Wrong message type ${messageType}`;
+            logger.error(`${this.logPrefix()} ${errMsg}`);
             throw new OCPPError(ErrorType.PROTOCOL_ERROR, errMsg);
         }
+        parentPort.postMessage(MessageChannelUtils.buildUpdatedMessage(this));
       } else {
-        throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming message is not iterable', null, {
-          payload: request,
+        throw new OCPPError(ErrorType.PROTOCOL_ERROR, 'Incoming message is not an array', null, {
+          request,
         });
       }
     } catch (error) {
       // Log
       logger.error(
-        "%s Incoming OCPP '%s' message '%j' matching cached request '%j' processing error: %j",
-        this.logPrefix(),
-        commandName ?? requestCommandName ?? null,
-        data.toString(),
-        this.requests.get(messageId),
+        `${this.logPrefix()} Incoming OCPP command '${
+          commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
+        }' message '${data.toString()}'${
+          messageType !== MessageType.CALL_MESSAGE
+            ? ` matching cached request '${JSON.stringify(this.requests.get(messageId))}'`
+            : ''
+        } processing error:`,
         error
       );
-      if (!(error instanceof OCPPError)) {
+      if (error instanceof OCPPError === false) {
         logger.warn(
-          "%s Error thrown at incoming OCPP '%s' message '%j' handling is not an OCPPError: %j",
-          this.logPrefix(),
-          commandName ?? requestCommandName ?? null,
-          data.toString(),
+          `${this.logPrefix()} Error thrown at incoming OCPP command '${
+            commandName ?? requestCommandName ?? Constants.UNKNOWN_COMMAND
+          }' message '${data.toString()}' handling is not an OCPPError:`,
           error
         );
       }
-      // Send error
-      messageType === MessageType.CALL_MESSAGE &&
-        (await this.ocppRequestService.sendError(
-          this,
-          messageId,
-          error as OCPPError,
-          commandName ?? requestCommandName ?? null
-        ));
+      switch (messageType) {
+        case MessageType.CALL_MESSAGE:
+          // Send error
+          await this.ocppRequestService.sendError(
+            this,
+            messageId,
+            error as OCPPError,
+            commandName ?? requestCommandName ?? null
+          );
+          break;
+        case MessageType.CALL_RESULT_MESSAGE:
+        case MessageType.CALL_ERROR_MESSAGE:
+          if (errorCallback) {
+            // Reject the deferred promise in case of error at response handling (rejecting an already fulfilled promise is a no-op)
+            errorCallback(error as OCPPError, false);
+          } else {
+            // Remove the request from the cache in case of error at response handling
+            this.requests.delete(messageId);
+          }
+          break;
+      }
     }
   }
 
   private onPing(): void {
-    logger.debug(this.logPrefix() + ' Received a WS ping (rfc6455) from the server');
+    logger.debug(`${this.logPrefix()} Received a WS ping (rfc6455) from the server`);
   }
 
   private onPong(): void {
-    logger.debug(this.logPrefix() + ' Received a WS pong (rfc6455) from the server');
+    logger.debug(`${this.logPrefix()} Received a WS pong (rfc6455) from the server`);
   }
 
   private onError(error: WSError): void {
     this.closeWSConnection();
-    logger.error(this.logPrefix() + ' WebSocket error: %j', error);
+    logger.error(`${this.logPrefix()} WebSocket error:`, error);
   }
 
-  private getUseConnectorId0(stationInfo?: ChargingStationInfo): boolean | undefined {
+  private getEnergyActiveImportRegister(connectorStatus: ConnectorStatus, rounded = false): number {
+    if (this.getMeteringPerTransaction() === true) {
+      return (
+        (rounded === true
+          ? Math.round(connectorStatus?.transactionEnergyActiveImportRegisterValue)
+          : connectorStatus?.transactionEnergyActiveImportRegisterValue) ?? 0
+      );
+    }
+    return (
+      (rounded === true
+        ? Math.round(connectorStatus?.energyActiveImportRegisterValue)
+        : connectorStatus?.energyActiveImportRegisterValue) ?? 0
+    );
+  }
+
+  private getUseConnectorId0(stationInfo?: ChargingStationInfo): boolean {
     const localStationInfo = stationInfo ?? this.stationInfo;
     return !Utils.isUndefined(localStationInfo.useConnectorId0)
       ? localStationInfo.useConnectorId0
@@ -1502,15 +1681,23 @@ export default class ChargingStation {
   private getNumberOfRunningTransactions(): number {
     let trxCount = 0;
     for (const connectorId of this.connectors.keys()) {
-      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
         trxCount++;
       }
     }
     return trxCount;
   }
 
+  private async stopRunningTransactions(reason = StopTransactionReason.NONE): Promise<void> {
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted === true) {
+        await this.stopTransactionOnConnector(connectorId, reason);
+      }
+    }
+  }
+
   // 0 for disabling
-  private getConnectionTimeout(): number | undefined {
+  private getConnectionTimeout(): number {
     if (
       ChargingStationConfigurationUtils.getConfigurationKey(
         this,
@@ -1530,7 +1717,7 @@ export default class ChargingStation {
   }
 
   // -1 for unlimited, 0 for disabling
-  private getAutoReconnectMaxRetries(): number | undefined {
+  private getAutoReconnectMaxRetries(): number {
     if (!Utils.isUndefined(this.stationInfo.autoReconnectMaxRetries)) {
       return this.stationInfo.autoReconnectMaxRetries;
     }
@@ -1541,7 +1728,7 @@ export default class ChargingStation {
   }
 
   // 0 for disabling
-  private getRegistrationMaxRetries(): number | undefined {
+  private getRegistrationMaxRetries(): number {
     if (!Utils.isUndefined(this.stationInfo.registrationMaxRetries)) {
       return this.stationInfo.registrationMaxRetries;
     }
@@ -1556,11 +1743,6 @@ export default class ChargingStation {
     return powerDivider;
   }
 
-  private getMaximumPower(stationInfo?: ChargingStationInfo): number {
-    const localStationInfo = stationInfo ?? this.stationInfo;
-    return (localStationInfo['maxPower'] as number) ?? localStationInfo.maximumPower;
-  }
-
   private getMaximumAmperage(stationInfo: ChargingStationInfo): number | undefined {
     const maximumPower = this.getMaximumPower(stationInfo);
     switch (this.getCurrentOutType(stationInfo)) {
@@ -1595,26 +1777,13 @@ export default class ChargingStation {
   }
 
   private async startMessageSequence(): Promise<void> {
-    if (this.stationInfo?.autoRegister) {
+    if (this.stationInfo?.autoRegister === true) {
       await this.ocppRequestService.requestHandler<
         BootNotificationRequest,
         BootNotificationResponse
-      >(
-        this,
-        RequestCommand.BOOT_NOTIFICATION,
-        {
-          chargePointModel: this.bootNotificationRequest.chargePointModel,
-          chargePointVendor: this.bootNotificationRequest.chargePointVendor,
-          chargeBoxSerialNumber: this.bootNotificationRequest.chargeBoxSerialNumber,
-          firmwareVersion: this.bootNotificationRequest.firmwareVersion,
-          chargePointSerialNumber: this.bootNotificationRequest.chargePointSerialNumber,
-          iccid: this.bootNotificationRequest.iccid,
-          imsi: this.bootNotificationRequest.imsi,
-          meterSerialNumber: this.bootNotificationRequest.meterSerialNumber,
-          meterType: this.bootNotificationRequest.meterType,
-        },
-        { skipBufferingOnError: true }
-      );
+      >(this, RequestCommand.BOOT_NOTIFICATION, this.bootNotificationRequest, {
+        skipBufferingOnError: true,
+      });
     }
     // Start WebSocket ping
     this.startWebSocketPing();
@@ -1622,86 +1791,53 @@ export default class ChargingStation {
     this.startHeartbeat();
     // Initialize connectors status
     for (const connectorId of this.connectors.keys()) {
+      let connectorStatus: ConnectorStatusEnum;
       if (connectorId === 0) {
         continue;
       } else if (
-        !this.stopped &&
         !this.getConnectorStatus(connectorId)?.status &&
-        this.getConnectorStatus(connectorId)?.bootStatus
+        (this.isChargingStationAvailable() === false ||
+          this.isConnectorAvailable(connectorId) === false)
       ) {
-        // Send status in template at startup
-        await this.ocppRequestService.requestHandler<
-          StatusNotificationRequest,
-          StatusNotificationResponse
-        >(this, RequestCommand.STATUS_NOTIFICATION, {
-          connectorId,
-          status: this.getConnectorStatus(connectorId).bootStatus,
-          errorCode: ChargePointErrorCode.NO_ERROR,
-        });
-        this.getConnectorStatus(connectorId).status =
-          this.getConnectorStatus(connectorId).bootStatus;
+        connectorStatus = ConnectorStatusEnum.UNAVAILABLE;
       } else if (
-        this.stopped &&
-        this.getConnectorStatus(connectorId)?.status &&
+        !this.getConnectorStatus(connectorId)?.status &&
         this.getConnectorStatus(connectorId)?.bootStatus
       ) {
-        // Send status in template after reset
-        await this.ocppRequestService.requestHandler<
-          StatusNotificationRequest,
-          StatusNotificationResponse
-        >(this, RequestCommand.STATUS_NOTIFICATION, {
-          connectorId,
-          status: this.getConnectorStatus(connectorId).bootStatus,
-          errorCode: ChargePointErrorCode.NO_ERROR,
-        });
-        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.requestHandler<
-          StatusNotificationRequest,
-          StatusNotificationResponse
-        >(this, RequestCommand.STATUS_NOTIFICATION, {
-          connectorId,
-          status: this.getConnectorStatus(connectorId).status,
-          errorCode: ChargePointErrorCode.NO_ERROR,
-        });
+        // Set boot status in template at startup
+        connectorStatus = this.getConnectorStatus(connectorId).bootStatus;
+      } else if (this.getConnectorStatus(connectorId)?.status) {
+        // Set previous status at startup
+        connectorStatus = this.getConnectorStatus(connectorId).status;
       } else {
-        // Send default status
-        await this.ocppRequestService.requestHandler<
-          StatusNotificationRequest,
-          StatusNotificationResponse
-        >(this, RequestCommand.STATUS_NOTIFICATION, {
-          connectorId,
-          status: ChargePointStatus.AVAILABLE,
-          errorCode: ChargePointErrorCode.NO_ERROR,
-        });
-        this.getConnectorStatus(connectorId).status = ChargePointStatus.AVAILABLE;
+        // Set default status
+        connectorStatus = ConnectorStatusEnum.AVAILABLE;
       }
+      await this.ocppRequestService.requestHandler<
+        StatusNotificationRequest,
+        StatusNotificationResponse
+      >(
+        this,
+        RequestCommand.STATUS_NOTIFICATION,
+        OCPPServiceUtils.buildStatusNotificationRequest(this, connectorId, connectorStatus)
+      );
+      this.getConnectorStatus(connectorId).status = connectorStatus;
     }
-    // Start the ATG
-    this.startAutomaticTransactionGenerator();
-  }
-
-  private startAutomaticTransactionGenerator() {
-    if (this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable) {
-      if (!this.automaticTransactionGenerator) {
-        this.automaticTransactionGenerator = AutomaticTransactionGenerator.getInstance(
-          this.getAutomaticTransactionGeneratorConfigurationFromTemplate(),
-          this
-        );
-      }
-      if (!this.automaticTransactionGenerator.started) {
-        this.automaticTransactionGenerator.start();
-      }
+    if (this.stationInfo?.firmwareStatus === FirmwareStatus.Installing) {
+      await this.ocppRequestService.requestHandler<
+        FirmwareStatusNotificationRequest,
+        FirmwareStatusNotificationResponse
+      >(this, RequestCommand.FIRMWARE_STATUS_NOTIFICATION, {
+        status: FirmwareStatus.Installed,
+      });
+      this.stationInfo.firmwareStatus = FirmwareStatus.Installed;
     }
-  }
 
-  private stopAutomaticTransactionGenerator(): void {
-    if (this.automaticTransactionGenerator?.started) {
-      this.automaticTransactionGenerator.stop();
-      this.automaticTransactionGenerator = null;
+    // Start the ATG
+    if (this.getAutomaticTransactionGeneratorConfigurationFromTemplate()?.enable === true) {
+      this.startAutomaticTransactionGenerator();
     }
+    this.wsConnectionRestarted === true && this.flushMessageBuffer();
   }
 
   private async stopMessageSequence(
@@ -1712,43 +1848,26 @@ export default class ChargingStation {
     // Stop heartbeat
     this.stopHeartbeat();
     // Stop ongoing transactions
-    if (this.automaticTransactionGenerator?.configuration?.enable) {
+    if (this.automaticTransactionGenerator?.started === true) {
       this.stopAutomaticTransactionGenerator();
     } else {
-      for (const connectorId of this.connectors.keys()) {
-        if (connectorId > 0 && this.getConnectorStatus(connectorId)?.transactionStarted) {
-          const transactionId = this.getConnectorStatus(connectorId).transactionId;
-          if (
-            this.getBeginEndMeterValues() &&
-            this.getOcppStrictCompliance() &&
-            !this.getOutOfOrderEndMeterValues()
-          ) {
-            // FIXME: Implement OCPP version agnostic helpers
-            const transactionEndMeterValue = OCPP16ServiceUtils.buildTransactionEndMeterValue(
-              this,
-              connectorId,
-              this.getEnergyActiveImportRegisterByTransactionId(transactionId)
-            );
-            await this.ocppRequestService.requestHandler<MeterValuesRequest, MeterValuesResponse>(
-              this,
-              RequestCommand.METER_VALUES,
-              {
-                connectorId,
-                transactionId,
-                meterValue: [transactionEndMeterValue],
-              }
-            );
-          }
-          await this.ocppRequestService.requestHandler<
-            StopTransactionRequest,
-            StopTransactionResponse
-          >(this, RequestCommand.STOP_TRANSACTION, {
-            transactionId,
-            meterStop: this.getEnergyActiveImportRegisterByTransactionId(transactionId),
-            idTag: this.getTransactionIdTag(transactionId),
-            reason,
-          });
-        }
+      await this.stopRunningTransactions(reason);
+    }
+    for (const connectorId of this.connectors.keys()) {
+      if (connectorId > 0) {
+        await this.ocppRequestService.requestHandler<
+          StatusNotificationRequest,
+          StatusNotificationResponse
+        >(
+          this,
+          RequestCommand.STATUS_NOTIFICATION,
+          OCPPServiceUtils.buildStatusNotificationRequest(
+            this,
+            connectorId,
+            ConnectorStatusEnum.UNAVAILABLE
+          )
+        );
+        this.getConnectorStatus(connectorId).status = null;
       }
     }
   }
@@ -1767,23 +1886,20 @@ export default class ChargingStation {
       : 0;
     if (webSocketPingInterval > 0 && !this.webSocketPingSetInterval) {
       this.webSocketPingSetInterval = setInterval(() => {
-        if (this.isWebSocketConnectionOpened()) {
-          this.wsConnection.ping((): void => {
-            /* This is intentional */
-          });
+        if (this.isWebSocketConnectionOpened() === true) {
+          this.wsConnection.ping();
         }
       }, webSocketPingInterval * 1000);
       logger.info(
-        this.logPrefix() +
-          ' WebSocket ping started every ' +
-          Utils.formatDurationSeconds(webSocketPingInterval)
+        `${this.logPrefix()} WebSocket ping started every ${Utils.formatDurationSeconds(
+          webSocketPingInterval
+        )}`
       );
     } else if (this.webSocketPingSetInterval) {
       logger.info(
-        this.logPrefix() +
-          ' WebSocket ping every ' +
-          Utils.formatDurationSeconds(webSocketPingInterval) +
-          ' already started'
+        `${this.logPrefix()} WebSocket ping already started every ${Utils.formatDurationSeconds(
+          webSocketPingInterval
+        )}`
       );
     } else {
       logger.error(
@@ -1803,43 +1919,36 @@ export default class ChargingStation {
   }
 
   private getConfiguredSupervisionUrl(): URL {
-    const supervisionUrls = Utils.cloneObject<string | string[]>(
-      this.stationInfo.supervisionUrls ?? Configuration.getSupervisionUrls()
-    );
+    const supervisionUrls = 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;
+          // FIXME
+          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
           break;
         case SupervisionUrlDistribution.RANDOM:
-          // Get a random url
-          urlIndex = Math.floor(Utils.secureRandom() * supervisionUrls.length);
+          this.configuredSupervisionUrlIndex = Math.floor(
+            Utils.secureRandom() * supervisionUrls.length
+          );
           break;
-        case SupervisionUrlDistribution.SEQUENTIAL:
-          if (this.index <= supervisionUrls.length) {
-            urlIndex = this.index - 1;
-          } else {
-            logger.warn(
-              `${this.logPrefix()} No more configured supervision urls available, using the first one`
-            );
-          }
+        case SupervisionUrlDistribution.CHARGING_STATION_AFFINITY:
+          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
           break;
         default:
           logger.error(
             `${this.logPrefix()} Unknown supervision url distribution '${Configuration.getSupervisionUrlDistribution()}' from values '${SupervisionUrlDistribution.toString()}', defaulting to ${
-              SupervisionUrlDistribution.ROUND_ROBIN
+              SupervisionUrlDistribution.CHARGING_STATION_AFFINITY
             }`
           );
-          urlIndex = (this.index - 1) % supervisionUrls.length;
+          this.configuredSupervisionUrlIndex = (this.index - 1) % supervisionUrls.length;
           break;
       }
-      return new URL(supervisionUrls[urlIndex]);
+      return new URL(supervisionUrls[this.configuredSupervisionUrlIndex]);
     }
     return new URL(supervisionUrls as string);
   }
 
-  private getHeartbeatInterval(): number | undefined {
+  private getHeartbeatInterval(): number {
     const HeartbeatInterval = ChargingStationConfigurationUtils.getConfigurationKey(
       this,
       StandardParametersKey.HeartbeatInterval
@@ -1854,7 +1963,7 @@ export default class ChargingStation {
     if (HeartBeatInterval) {
       return Utils.convertToInt(HeartBeatInterval.value) * 1000;
     }
-    !this.stationInfo?.autoRegister &&
+    this.stationInfo?.autoRegister === false &&
       logger.warn(
         `${this.logPrefix()} Heartbeat interval configuration key not set, using default value: ${
           Constants.DEFAULT_HEARTBEAT_INTERVAL
@@ -1869,76 +1978,8 @@ export default class ChargingStation {
     }
   }
 
-  private openWSConnection(
-    options: WsOptions = this.stationInfo?.wsOptions ?? {},
-    params: { closeOpened?: boolean; terminateOpened?: boolean } = {
-      closeOpened: false,
-      terminateOpened: false,
-    }
-  ): void {
-    options.handshakeTimeout = options?.handshakeTimeout ?? this.getConnectionTimeout() * 1000;
-    params.closeOpened = params?.closeOpened ?? false;
-    params.terminateOpened = params?.terminateOpened ?? false;
-    if (
-      !Utils.isNullOrUndefined(this.stationInfo.supervisionUser) &&
-      !Utils.isNullOrUndefined(this.stationInfo.supervisionPassword)
-    ) {
-      options.auth = `${this.stationInfo.supervisionUser}:${this.stationInfo.supervisionPassword}`;
-    }
-    if (params?.closeOpened) {
-      this.closeWSConnection();
-    }
-    if (params?.terminateOpened) {
-      this.terminateWSConnection();
-    }
-    let protocol: string;
-    switch (this.getOcppVersion()) {
-      case OCPPVersion.VERSION_16:
-        protocol = 'ocpp' + OCPPVersion.VERSION_16;
-        break;
-      default:
-        this.handleUnsupportedVersion(this.getOcppVersion());
-        break;
-    }
-
-    logger.info(
-      this.logPrefix() + ' Open OCPP connection to URL ' + this.wsConnectionUrl.toString()
-    );
-
-    this.wsConnection = new WebSocket(this.wsConnectionUrl, protocol, options);
-
-    // Handle WebSocket message
-    this.wsConnection.on(
-      'message',
-      this.onMessage.bind(this) as (this: WebSocket, data: RawData, isBinary: boolean) => void
-    );
-    // Handle WebSocket error
-    this.wsConnection.on(
-      'error',
-      this.onError.bind(this) as (this: WebSocket, error: Error) => void
-    );
-    // Handle WebSocket close
-    this.wsConnection.on(
-      'close',
-      this.onClose.bind(this) as (this: WebSocket, code: number, reason: Buffer) => void
-    );
-    // Handle WebSocket open
-    this.wsConnection.on('open', this.onOpen.bind(this) as (this: WebSocket) => void);
-    // Handle WebSocket ping
-    this.wsConnection.on('ping', this.onPing.bind(this) as (this: WebSocket, data: Buffer) => void);
-    // Handle WebSocket pong
-    this.wsConnection.on('pong', this.onPong.bind(this) as (this: WebSocket, data: Buffer) => void);
-  }
-
-  private closeWSConnection(): void {
-    if (this.isWebSocketConnectionOpened()) {
-      this.wsConnection.close();
-      this.wsConnection = null;
-    }
-  }
-
   private terminateWSConnection(): void {
-    if (this.isWebSocketConnectionOpened()) {
+    if (this.isWebSocketConnectionOpened() === true) {
       this.wsConnection.terminate();
       this.wsConnection = null;
     }
@@ -1950,19 +1991,19 @@ export default class ChargingStation {
     }
   }
 
-  private getReconnectExponentialDelay(): boolean | undefined {
+  private getReconnectExponentialDelay(): boolean {
     return !Utils.isUndefined(this.stationInfo.reconnectExponentialDelay)
       ? this.stationInfo.reconnectExponentialDelay
       : false;
   }
 
-  private async reconnect(code: number): Promise<void> {
+  private async reconnect(): Promise<void> {
     // Stop WebSocket ping
     this.stopWebSocketPing();
     // Stop heartbeat
     this.stopHeartbeat();
     // Stop the ATG if needed
-    if (this.automaticTransactionGenerator?.configuration?.stopOnConnectionFailure) {
+    if (this.automaticTransactionGenerator?.configuration?.stopOnConnectionFailure === true) {
       this.stopAutomaticTransactionGenerator();
     }
     if (
@@ -1979,16 +2020,14 @@ export default class ChargingStation {
           ? reconnectDelay - reconnectDelayWithdraw
           : 0;
       logger.error(
-        `${this.logPrefix()} WebSocket: connection retry in ${Utils.roundTo(
+        `${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.logPrefix()} WebSocket connection retry #${this.autoReconnectRetryCount.toString()}`
       );
       this.openWSConnection(
         { ...(this.stationInfo?.wsOptions ?? {}), handshakeTimeout: reconnectTimeout },
@@ -1997,9 +2036,9 @@ export default class ChargingStation {
       this.wsConnectionRestarted = true;
     } else if (this.getAutoReconnectMaxRetries() !== -1) {
       logger.error(
-        `${this.logPrefix()} WebSocket reconnect failure: maximum retries reached (${
+        `${this.logPrefix()} WebSocket connection retries failure: maximum retries reached (${
           this.autoReconnectRetryCount
-        }) or retry disabled (${this.getAutoReconnectMaxRetries()})`
+        }) or retries disabled (${this.getAutoReconnectMaxRetries()})`
       );
     }
   }