X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fcharging-station%2FChargingStation.js;h=304a4e7abd6af4efd13bfd7fd9f28f9d906b4aca;hb=488fd3a755df336223b6d469a07c7605d325289b;hp=4ebb52af4b3d21ae2c26b2fb216ba6cfaeaacfc0;hpb=7dde0b73302613be132c41e1f28a42de555dc2b6;p=e-mobility-charging-stations-simulator.git

diff --git a/src/charging-station/ChargingStation.js b/src/charging-station/ChargingStation.js
index 4ebb52af..304a4e7a 100644
--- a/src/charging-station/ChargingStation.js
+++ b/src/charging-station/ChargingStation.js
@@ -1,68 +1,215 @@
 const Configuration = require('../utils/Configuration');
 const logger = require('../utils/Logger');
 const WebSocket = require('ws');
-const {
-  OCPP_JSON_CALL_MESSAGE,
-  OCPP_JSON_CALL_RESULT_MESSAGE,
-  OCPP_JSON_CALL_ERROR_MESSAGE,
-  OCPP_ERROR_INTERNAL_ERROR,
-  OCPP_SOCKET_TIMEOUT,
-  OCPP_ERROR_NOT_IMPLEMENTED,
-} = require('../utils/Constants');
+const Constants = require('../utils/Constants');
 const Utils = require('../utils/Utils');
 const OCPPError = require('./OcppError');
-const {v4: uuid} = require('uuid');
 const AutomaticTransactionGenerator = require('./AutomaticTransactionGenerator');
 const Statistics = require('../utils/Statistics');
 const fs = require('fs');
+const crypto = require('crypto');
 const {performance, PerformanceObserver} = require('perf_hooks');
 
 class ChargingStation {
-  constructor(index, stationTemplate) {
-    this._requests = {};
+  constructor(index, stationTemplateFile) {
+    this._index = index;
+    this._stationTemplateFile = stationTemplateFile;
+    this._connectors = {};
+    this._initialize();
+
+    this._isSocketRestart = false;
     this._autoReconnectRetryCount = 0;
     this._autoReconnectMaxRetries = Configuration.getAutoReconnectMaxRetries(); // -1 for unlimited
     this._autoReconnectTimeout = Configuration.getAutoReconnectTimeout() * 1000; // ms, zero for disabling
-    this._isSocketRestart = false;
-    this._stationInfo = this._buildChargingStation(index, stationTemplate);
-    this._statistics = new Statistics(this._stationInfo.name);
-    this._performanceObserver = new PerformanceObserver((list) => {
-      const entry = list.getEntries()[0];
-      this._statistics.logPerformance(entry, 'ChargingStation');
-      this._performanceObserver.disconnect();
-    });
-    this._index = index;
+
+    this._requests = {};
     this._messageQueue = [];
+
+    this._authorizedTags = this._loadAndGetAuthorizedTags();
+  }
+
+  _getStationName(stationTemplate) {
+    return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + this._index).substr(('000000000' + this._index).length - 4);
+  }
+
+  _buildStationInfo() {
+    let stationTemplateFromFile;
+    try {
+      // Load template file
+      const fileDescriptor = fs.openSync(this._stationTemplateFile, 'r');
+      stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
+      fs.closeSync(fileDescriptor);
+    } catch (error) {
+      logger.error('Template file ' + this._stationTemplateFile + ' loading error: ' + error);
+      throw error;
+    }
+    const stationTemplate = stationTemplateFromFile || {};
+    if (!Utils.isEmptyArray(stationTemplateFromFile.power)) {
+      stationTemplate.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
+    } else {
+      stationTemplate.maxPower = stationTemplateFromFile.power;
+    }
+    stationTemplate.name = this._getStationName(stationTemplateFromFile);
+    stationTemplate.resetTime = stationTemplateFromFile.resetTime ? stationTemplateFromFile.resetTime * 1000 : Constants.CHARGING_STATION_DEFAULT_RESET_TIME;
+    return stationTemplate;
+  }
+
+  _initialize() {
+    this._stationInfo = this._buildStationInfo();
     this._bootNotificationMessage = {
       chargePointModel: this._stationInfo.chargePointModel,
       chargePointVendor: this._stationInfo.chargePointVendor,
+      chargePointSerialNumber: this._stationInfo.chargePointSerialNumberPrefix ? this._stationInfo.chargePointSerialNumberPrefix : '',
+      firmwareVersion: this._stationInfo.firmwareVersion ? this._stationInfo.firmwareVersion : '',
     };
-    this._configuration = this._getConfiguration(stationTemplate);
-    this._authorizationFile = this._getAuthorizationFile(stationTemplate);
-    this._supervisionUrl = this._getSupervisionURL(index, stationTemplate);
+    this._configuration = this._getConfiguration();
+    this._supervisionUrl = this._getSupervisionURL();
+    this._wsConnectionUrl = this._supervisionUrl + '/' + this._stationInfo.name;
+    // Build connectors if needed
+    const maxConnectors = this._getMaxNumberOfConnectors();
+    if (maxConnectors <= 0) {
+      const errMsg = `${this._logPrefix()} Charging station template ${this._stationTemplateFile} with no connectors`;
+      logger.error(errMsg);
+      throw Error(errMsg);
+    }
+    const connectorsConfigHash = crypto.createHash('sha256').update(JSON.stringify(this._stationInfo.Connectors) + maxConnectors.toString()).digest('hex');
+    // FIXME: Handle shrinking the number of connectors
+    if (!this._connectors || (this._connectors && this._connectorsConfigurationHash !== connectorsConfigHash)) {
+      this._connectorsConfigurationHash = connectorsConfigHash;
+      // Determine number of customized connectors
+      let lastConnector;
+      for (lastConnector in this._stationInfo.Connectors) {
+        // Add connector Id 0
+        if (Utils.convertToBoolean(this._stationInfo.useConnectorId0) && this._stationInfo.Connectors[lastConnector] &&
+          lastConnector === 0) {
+          this._connectors[lastConnector] = Utils.cloneJSonDocument(this._stationInfo.Connectors[lastConnector]);
+        }
+      }
+      this._addConfigurationKey('NumberOfConnectors', maxConnectors, true);
+      if (!this._getConfigurationKey('MeterValuesSampledData')) {
+        this._addConfigurationKey('MeterValuesSampledData', 'Energy.Active.Import.Register');
+      }
+      // Sanity check
+      if (maxConnectors > lastConnector && !Utils.convertToBoolean(this._stationInfo.randomConnectors)) {
+        logger.warn(`${this._logPrefix()} Number of connectors exceeds the number of connector configurations in template ${this._stationTemplateFile}, forcing random connector configurations affectation`);
+        this._stationInfo.randomConnectors = true;
+      }
+      // Generate all connectors
+      for (let index = 1; index <= maxConnectors; index++) {
+        const randConnectorID = Utils.convertToBoolean(this._stationInfo.randomConnectors) ? Utils.getRandomInt(lastConnector, 1) : index;
+        this._connectors[index] = Utils.cloneJSonDocument(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 (!this.getConnector(connector).transactionStarted) {
+        this._initTransactionOnConnector(connector);
+      }
+    }
+    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, 'ChargingStation');
+        this._performanceObserver.disconnect();
+      });
+    }
   }
 
-  _basicFormatLog() {
-    return Utils.basicFormatLog(` ${this._stationInfo.name}:`);
+  _logPrefix() {
+    return Utils.logPrefix(` ${this._stationInfo.name}:`);
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  _getConfiguration(stationTemplate) {
-    return stationTemplate.Configuration ? stationTemplate.Configuration : {};
+  _getConfiguration() {
+    return this._stationInfo.Configuration ? this._stationInfo.Configuration : {};
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  _getAuthorizationFile(stationTemplate) {
-    return stationTemplate.authorizationFile ? stationTemplate.authorizationFile : '';
+  _getAuthorizationFile() {
+    return this._stationInfo.authorizationFile ? this._stationInfo.authorizationFile : '';
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  _getSupervisionURL(index, stationTemplate) {
-    const supervisionUrls = JSON.parse(JSON.stringify(stationTemplate.supervisionURL ? stationTemplate.supervisionURL : Configuration.getSupervisionURLs()));
+  _loadAndGetAuthorizedTags() {
+    let authorizedTags = [];
+    const authorizationFile = this._getAuthorizationFile();
+    if (authorizationFile) {
+      try {
+        // Load authorization file
+        const fileDescriptor = fs.openSync(authorizationFile, 'r');
+        authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
+        fs.closeSync(fileDescriptor);
+      } catch (error) {
+        logger.error(this._logPrefix() + ' Authorization file ' + authorizationFile + ' loading error: ' + error);
+        throw error;
+      }
+    } else {
+      logger.info(this._logPrefix() + ' No authorization file given in template file ' + this._stationTemplateFile);
+    }
+    return authorizedTags;
+  }
+
+  getRandomTagId() {
+    const index = Math.floor(Math.random() * this._authorizedTags.length);
+    return this._authorizedTags[index];
+  }
+
+  hasAuthorizedTags() {
+    return !Utils.isEmptyArray(this._authorizedTags);
+  }
+
+  getEnableStatistics() {
+    return !Utils.isUndefined(this._stationInfo.enableStatistics) ? this._stationInfo.enableStatistics : true;
+  }
+
+  _getNumberOfRunningTransactions() {
+    let trxCount = 0;
+    for (const connector in this._connectors) {
+      if (this.getConnector(connector).transactionStarted) {
+        trxCount++;
+      }
+    }
+    return trxCount;
+  }
+
+  _getPowerDivider() {
+    let powerDivider = this._getNumberOfConnectors();
+    if (this._stationInfo.powerSharedByConnectors) {
+      powerDivider = this._getNumberOfRunningTransactions();
+    }
+    return powerDivider;
+  }
+
+  getConnector(id) {
+    return this._connectors[Utils.convertToInt(id)];
+  }
+
+  _getMaxNumberOfConnectors() {
+    let maxConnectors = 0;
+    if (!Utils.isEmptyArray(this._stationInfo.numberOfConnectors)) {
+      // Distribute evenly the number of connectors
+      maxConnectors = this._stationInfo.numberOfConnectors[(this._index - 1) % this._stationInfo.numberOfConnectors.length];
+    } else if (this._stationInfo.numberOfConnectors) {
+      maxConnectors = this._stationInfo.numberOfConnectors;
+    } else {
+      maxConnectors = Utils.convertToBoolean(this._stationInfo.useConnectorId0) ? Object.keys(this._stationInfo.Connectors).length - 1 :
+                                              Object.keys(this._stationInfo.Connectors).length;
+    }
+    return maxConnectors;
+  }
+
+  _getNumberOfConnectors() {
+    return Utils.convertToBoolean(this._stationInfo.useConnectorId0) ? Object.keys(this._connectors).length - 1 : Object.keys(this._connectors).length;
+  }
+
+  _getSupervisionURL() {
+    const supervisionUrls = Utils.cloneJSonDocument(this._stationInfo.supervisionURL ? this._stationInfo.supervisionURL : Configuration.getSupervisionURLs());
     let indexUrl = 0;
-    if (Array.isArray(supervisionUrls)) {
-      if (Configuration.getEquallySupervisionDistribution()) {
-        indexUrl = index % supervisionUrls.length;
+    if (!Utils.isEmptyArray(supervisionUrls)) {
+      if (Configuration.getDistributeStationToTenantEqually()) {
+        indexUrl = this._index % supervisionUrls.length;
       } else {
         // Get a random url
         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
@@ -72,55 +219,127 @@ class ChargingStation {
     return supervisionUrls;
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  _getStationName(index, stationTemplate) {
-    return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + index).substr(('000000000' + index).length - 4);
+  _getAuthorizeRemoteTxRequests() {
+    const authorizeRemoteTxRequests = this._getConfigurationKey('AuthorizeRemoteTxRequests');
+    return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
   }
 
-  _getAuthorizeRemoteTxRequests() {
-    const authorizeRemoteTxRequests = this._configuration.configurationKey.find((configElement) => configElement.key === 'AuthorizeRemoteTxRequests');
-    return authorizeRemoteTxRequests ? authorizeRemoteTxRequests.value : false;
+  _getLocalAuthListEnabled() {
+    const localAuthListEnabled = this._getConfigurationKey('LocalAuthListEnabled');
+    return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
   }
 
-  _buildChargingStation(index, stationTemplate) {
-    if (Array.isArray(stationTemplate.power)) {
-      stationTemplate.maxPower = stationTemplate.power[Math.floor(Math.random() * stationTemplate.power.length)];
+  async _basicStartMessageSequence() {
+    // Start heartbeat
+    this._startHeartbeat(this);
+    // Initialize connectors status
+    for (const connector in this._connectors) {
+      if (!this.getConnector(connector).transactionStarted) {
+        if (this.getConnector(connector).bootStatus) {
+          this.sendStatusNotificationWithTimeout(connector, this.getConnector(connector).bootStatus);
+        } else {
+          this.sendStatusNotificationWithTimeout(connector, 'Available');
+        }
+      } else {
+        this.sendStatusNotificationWithTimeout(connector, 'Charging');
+      }
+    }
+    // Start the ATG
+    if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable)) {
+      if (!this._automaticTransactionGeneration) {
+        this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
+      }
+      if (this._automaticTransactionGeneration.timeToStop) {
+        this._automaticTransactionGeneration.start();
+      }
+    }
+    if (this.getEnableStatistics()) {
+      this._statistics.start();
+    }
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  async _startHeartbeat(self) {
+    if (self._heartbeatInterval && self._heartbeatInterval > 0 && !self._heartbeatSetInterval) {
+      self._heartbeatSetInterval = setInterval(() => {
+        this.sendHeartbeat();
+      }, self._heartbeatInterval);
+      logger.info(self._logPrefix() + ' Heartbeat started every ' + self._heartbeatInterval + 'ms');
     } else {
-      stationTemplate.maxPower = stationTemplate.power;
+      logger.error(`${self._logPrefix()} Heartbeat interval set to ${self._heartbeatInterval}, not starting the heartbeat`);
     }
-    stationTemplate.name = this._getStationName(index, stationTemplate);
-    return stationTemplate;
   }
 
-  async start() {
-    logger.info(this._basicFormatLog() + ' Will communicate with ' + this._supervisionUrl);
-    this._url = this._supervisionUrl + '/' + this._stationInfo.name;
-    this._wsConnection = new WebSocket(this._url, 'ocpp1.6');
-    if (this._authorizationFile !== '') {
+  async _stopHeartbeat() {
+    if (this._heartbeatSetInterval) {
+      clearInterval(this._heartbeatSetInterval);
+      this._heartbeatSetInterval = null;
+    }
+  }
+
+  _startAuthorizationFileMonitoring() {
+    // eslint-disable-next-line no-unused-vars
+    fs.watchFile(this._getAuthorizationFile(), (current, previous) => {
       try {
-        // load file
-        const fileDescriptor = fs.openSync(this._authorizationFile, 'r');
-        this._authorizedKeys = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
-        fs.closeSync(fileDescriptor);
-        // get remote authorization logic
-        // FIXME: move to the constructor
-        this._authorizeRemoteTxRequests = this._getAuthorizeRemoteTxRequests();
-        // monitor authorization file
-        // eslint-disable-next-line no-unused-vars
-        fs.watchFile(this._authorizationFile, (current, previous) => {
-          try {
-            // reload file
-            const fileDescriptor = fs.openSync(this._authorizationFile, 'r');
-            this._authorizedKeys = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
-            fs.closeSync(fileDescriptor);
-          } catch (error) {
-            logger.error(this._basicFormatLog() + ' Authorization file error: ' + error);
-          }
-        });
+        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: ' + error);
+      }
+    });
+  }
+
+  _startStationTemplateFileMonitoring() {
+    // eslint-disable-next-line no-unused-vars
+    fs.watchFile(this._stationTemplateFile, (current, previous) => {
+      try {
+        logger.debug(this._logPrefix() + ' Template file ' + this._stationTemplateFile + ' have changed, reload');
+        // Initialize
+        this._initialize();
+        this._addConfigurationKey('HeartBeatInterval', Utils.convertToInt(this._heartbeatInterval ? this._heartbeatInterval / 1000 : 0));
+        this._addConfigurationKey('HeartbeatInterval', Utils.convertToInt(this._heartbeatInterval ? this._heartbeatInterval / 1000 : 0), false, false);
       } catch (error) {
-        logger.error(this._basicFormatLog() + ' Authorization file error: ' + error);
+        logger.error(this._logPrefix() + ' Charging station template file monitoring error: ' + error);
       }
+    });
+  }
+
+  async _startMeterValues(connectorId, interval) {
+    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 ${connectorId} with no transaction id`);
+      return;
     }
+    if (interval > 0) {
+      this.getConnector(connectorId).transactionSetInterval = setInterval(async () => {
+        if (this.getEnableStatistics()) {
+          const sendMeterValues = performance.timerify(this.sendMeterValues);
+          this._performanceObserver.observe({
+            entryTypes: ['function'],
+          });
+          await sendMeterValues(connectorId, interval, this);
+        } else {
+          await this.sendMeterValues(connectorId, interval, this);
+        }
+      }, interval);
+    } else {
+      logger.error(`${this._logPrefix()} Charging station MeterValueSampleInterval configuration set to ${interval}ms, not sending MeterValues`);
+    }
+  }
+
+  async start() {
+    if (!this._wsConnectionUrl) {
+      this._wsConnectionUrl = this._supervisionUrl + '/' + this._stationInfo.name;
+    }
+    this._wsConnection = new WebSocket(this._wsConnectionUrl, 'ocpp' + Constants.OCPP_VERSION_16);
+    logger.info(this._logPrefix() + ' Will communicate through URL ' + this._supervisionUrl);
+    // 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
@@ -133,24 +352,69 @@ class ChargingStation {
     this._wsConnection.on('ping', this.onPing.bind(this));
   }
 
+  async stop(reason = '') {
+    // Stop heartbeat
+    await this._stopHeartbeat();
+    // Stop the ATG
+    if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable) &&
+      this._automaticTransactionGeneration &&
+      !this._automaticTransactionGeneration.timeToStop) {
+      await this._automaticTransactionGeneration.stop(reason);
+    } else {
+      for (const connector in this._connectors) {
+        if (this.getConnector(connector).transactionStarted) {
+          await this.sendStopTransaction(this.getConnector(connector).transactionId, reason);
+        }
+      }
+    }
+    // eslint-disable-next-line guard-for-in
+    for (const connector in this._connectors) {
+      await this.sendStatusNotification(connector, 'Unavailable');
+    }
+    if (this._wsConnection && this._wsConnection.readyState === WebSocket.OPEN) {
+      await this._wsConnection.close();
+    }
+  }
+
+  _reconnect(error) {
+    logger.error(this._logPrefix() + ' Socket: abnormally closed', error);
+    // Stop the ATG if needed
+    if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable) &&
+      Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure) &&
+      this._automaticTransactionGeneration &&
+      !this._automaticTransactionGeneration.timeToStop) {
+      this._automaticTransactionGeneration.stop();
+    }
+    // Stop heartbeat
+    this._stopHeartbeat();
+    if (this._autoReconnectTimeout !== 0 &&
+      (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1)) {
+      logger.error(`${this._logPrefix()} Socket: connection retry with timeout ${this._autoReconnectTimeout}ms`);
+      this._autoReconnectRetryCount++;
+      setTimeout(() => {
+        logger.error(this._logPrefix() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount);
+        this.start();
+      }, this._autoReconnectTimeout);
+    } else if (this._autoReconnectTimeout !== 0 || this._autoReconnectMaxRetries !== -1) {
+      logger.error(`${this._logPrefix()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectTimeout})`);
+    }
+  }
+
   onOpen() {
-    logger.info(`${this._basicFormatLog()} Is connected to server through ${this._url}`);
+    logger.info(`${this._logPrefix()} Is connected to server through ${this._wsConnectionUrl}`);
+    if (!this._isSocketRestart) {
+      // Send BootNotification
+      this.sendBootNotification();
+    }
     if (this._isSocketRestart) {
-      this.basicStartMessageSequence();
-      if (this._messageQueue.length > 0) {
+      this._basicStartMessageSequence();
+      if (!Utils.isEmptyArray(this._messageQueue)) {
         this._messageQueue.forEach((message) => {
-          if (this._wsConnection.readyState === WebSocket.OPEN) {
+          if (this._wsConnection && this._wsConnection.readyState === WebSocket.OPEN) {
             this._wsConnection.send(message);
           }
         });
       }
-    } else {
-      // At first start, send Bootnotification
-      try {
-        this.sendMessage(uuid(), this._bootNotificationMessage, OCPP_JSON_CALL_MESSAGE, 'BootNotification');
-      } catch (error) {
-        logger.error(this._basicFormatLog() + ' Send boot notification error: ' + error);
-      }
     }
     this._autoReconnectRetryCount = 0;
     this._isSocketRestart = false;
@@ -163,7 +427,7 @@ class ChargingStation {
         this._reconnect(error);
         break;
       default:
-        logger.error(this._basicFormatLog() + ' Socket error: ' + error);
+        logger.error(this._logPrefix() + ' Socket error: ' + error);
         break;
     }
   }
@@ -172,7 +436,7 @@ class ChargingStation {
     switch (error) {
       case 1000: // Normal close
       case 1005:
-        logger.info(this._basicFormatLog() + ' Socket normally closed ' + error);
+        logger.info(this._logPrefix() + ' Socket normally closed ' + error);
         this._autoReconnectRetryCount = 0;
         break;
       default: // Abnormal close
@@ -183,24 +447,24 @@ class ChargingStation {
   }
 
   onPing() {
-    logger.info(this._basicFormatLog() + ' Has received a WS ping (rfc6455) from the server');
+    logger.debug(this._logPrefix() + ' Has received a WS ping (rfc6455) from the server');
   }
 
   async onMessage(message) {
-    // Parse the message
-    const [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(message);
-
+    let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
     try {
+      // Parse the message
+      [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(message);
+
       // Check the Type of message
       switch (messageType) {
         // Incoming Message
-        case OCPP_JSON_CALL_MESSAGE:
+        case Constants.OCPP_JSON_CALL_MESSAGE:
           // Process the call
-          this._statistics.addMessage(commandName);
           await this.handleRequest(messageId, commandName, commandPayload);
           break;
         // Outcome Message
-        case OCPP_JSON_CALL_RESULT_MESSAGE:
+        case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
           // Respond
           // eslint-disable-next-line no-case-declarations
           let responseCallback; let requestPayload;
@@ -214,11 +478,10 @@ class ChargingStation {
             throw new Error(`Response for unknown message id ${messageId}`);
           }
           delete this._requests[messageId];
-          // this._statistics.addMessage(commandName)
           responseCallback(commandName, requestPayload);
           break;
         // Error Message
-        case OCPP_JSON_CALL_ERROR_MESSAGE:
+        case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
           if (!this._requests[messageId]) {
             // Error
             throw new Error(`Error for unknown message id ${messageId}`);
@@ -239,50 +502,171 @@ class ChargingStation {
       }
     } catch (error) {
       // Log
-      logger.error('%s Incoming message %j processing error %s on request content %s', this._basicFormatLog(), message, error, this._requests[messageId]);
+      logger.error('%s Incoming message %j processing error %s on request content %s', this._logPrefix(), message, error, this._requests[messageId]);
       // Send error
       // await this.sendError(messageId, error);
     }
   }
 
-  _reconnect(error) {
-    logger.error(this._basicFormatLog() + ' Socket: abnormally closed', error);
-    // Stop heartbeat interval
-    if (this._heartbeatSetInterval) {
-      clearInterval(this._heartbeatSetInterval);
-      this._heartbeatSetInterval = null;
+  sendHeartbeat() {
+    try {
+      const payload = {
+        currentTime: new Date().toISOString(),
+      };
+      this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
+    } catch (error) {
+      logger.error(this._logPrefix() + ' Send Heartbeat error: ' + error);
+      throw error;
     }
-    // Stop the ATG
-    if (this._stationInfo.AutomaticTransactionGenerator.enable && this._automaticTransactionGeneration &&
-      !this._automaticTransactionGeneration._timeToStop) {
-      this._automaticTransactionGeneration.stop();
+  }
+
+  sendBootNotification() {
+    try {
+      this.sendMessage(Utils.generateUUID(), this._bootNotificationMessage, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification');
+    } catch (error) {
+      logger.error(this._logPrefix() + ' Send BootNotification error: ' + error);
+      throw error;
     }
-    if (this._autoReconnectTimeout !== 0 &&
-      (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1)) {
-      logger.error(`${this._basicFormatLog()} Socket: connection retry with timeout ${this._autoReconnectTimeout}ms`);
-      this._autoReconnectRetryCount++;
-      setTimeout(() => {
-        logger.error(this._basicFormatLog() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount);
-        this.start();
-      }, this._autoReconnectTimeout);
-    } else if (this._autoReconnectTimeout !== 0 || this._autoReconnectMaxRetries !== -1) {
-      logger.error(`${this._basicFormatLog()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectTimeout})`);
+  }
+
+  async sendStatusNotification(connectorId, status, errorCode = 'NoError') {
+    try {
+      const payload = {
+        connectorId,
+        errorCode,
+        status,
+      };
+      await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
+    } catch (error) {
+      logger.error(this._logPrefix() + ' Send StatusNotification error: ' + error);
+      throw error;
+    }
+  }
+
+  sendStatusNotificationWithTimeout(connectorId, status, errorCode = 'NoError', timeout = Constants.STATUS_NOTIFICATION_TIMEOUT) {
+    setTimeout(() => this.sendStatusNotification(connectorId, status, errorCode), timeout);
+  }
+
+  async sendStartTransaction(connectorId, idTag) {
+    try {
+      const payload = {
+        connectorId,
+        idTag,
+        meterStart: 0,
+        timestamp: new Date().toISOString(),
+      };
+      return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction');
+    } catch (error) {
+      logger.error(this._logPrefix() + ' Send StartTransaction error: ' + error);
+      throw error;
+    }
+  }
+
+  sendStartTransactionWithTimeout(connectorId, idTag, timeout) {
+    setTimeout(() => this.sendStartTransaction(connectorId, idTag), timeout);
+  }
+
+  async sendStopTransaction(transactionId, reason = '') {
+    try {
+      let payload;
+      if (reason) {
+        payload = {
+          transactionId,
+          meterStop: 0,
+          timestamp: new Date().toISOString(),
+          reason,
+        };
+      } else {
+        payload = {
+          transactionId,
+          meterStop: 0,
+          timestamp: new Date().toISOString(),
+        };
+      }
+      await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction');
+    } catch (error) {
+      logger.error(this._logPrefix() + ' Send StopTransaction error: ' + error);
+      throw error;
     }
   }
 
-  send(command, messageType = OCPP_JSON_CALL_MESSAGE) {
-    // Send Message
-    return this.sendMessage(uuid(), command, messageType);
+  // eslint-disable-next-line class-methods-use-this
+  async sendMeterValues(connectorId, interval, self, debug = false) {
+    try {
+      const sampledValueLcl = {
+        timestamp: new Date().toISOString(),
+      };
+      const meterValuesClone = Utils.cloneJSonDocument(self.getConnector(connectorId).MeterValues);
+      if (!Utils.isEmptyArray(meterValuesClone)) {
+        sampledValueLcl.sampledValue = meterValuesClone;
+      } else {
+        sampledValueLcl.sampledValue = [meterValuesClone];
+      }
+      for (let index = 0; index < sampledValueLcl.sampledValue.length; index++) {
+        const connector = self.getConnector(connectorId);
+        // SoC measurand
+        if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'SoC' && self._getConfigurationKey('MeterValuesSampledData').value.includes('SoC')) {
+          sampledValueLcl.sampledValue[index].value = !Utils.isUndefined(sampledValueLcl.sampledValue[index].value) ?
+            sampledValueLcl.sampledValue[index].value :
+            sampledValueLcl.sampledValue[index].value = Utils.getRandomInt(100);
+          if (sampledValueLcl.sampledValue[index].value > 100 || debug) {
+            logger.error(`${self._logPrefix()} MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${sampledValueLcl.sampledValue[index].value}`);
+          }
+        // Voltage measurand
+        } else if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'Voltage' && self._getConfigurationKey('MeterValuesSampledData').value.includes('Voltage')) {
+          sampledValueLcl.sampledValue[index].value = !Utils.isUndefined(sampledValueLcl.sampledValue[index].value) ? sampledValueLcl.sampledValue[index].value : 230;
+        // Energy.Active.Import.Register measurand (default)
+        } else if (!sampledValueLcl.sampledValue[index].measurand || sampledValueLcl.sampledValue[index].measurand === 'Energy.Active.Import.Register') {
+          if (Utils.isUndefined(self._stationInfo.powerDivider)) {
+            const errMsg = `${self._logPrefix()} MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'}: powerDivider is undefined`;
+            logger.error(errMsg);
+            throw Error(errMsg);
+          } else if (self._stationInfo.powerDivider && self._stationInfo.powerDivider <= 0) {
+            const errMsg = `${self._logPrefix()} MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'}: powerDivider have zero or below value ${self._stationInfo.powerDivider}`;
+            logger.error(errMsg);
+            throw Error(errMsg);
+          }
+          if (Utils.isUndefined(sampledValueLcl.sampledValue[index].value)) {
+            const measurandValue = Utils.getRandomInt(self._stationInfo.maxPower / (self._stationInfo.powerDivider * 3600000) * interval);
+            // Persist previous value in connector
+            if (connector && connector.lastEnergyActiveImportRegisterValue >= 0) {
+              connector.lastEnergyActiveImportRegisterValue += measurandValue;
+            } else {
+              connector.lastEnergyActiveImportRegisterValue = 0;
+            }
+            sampledValueLcl.sampledValue[index].value = connector.lastEnergyActiveImportRegisterValue;
+          }
+          logger.info(`${self._logPrefix()} MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'}: connectorId ${connectorId}, transaction ${connector.transactionId}, value ${sampledValueLcl.sampledValue[index].value}`);
+          const maxConsumption = self._stationInfo.maxPower * 3600 / (self._stationInfo.powerDivider * interval);
+          if (sampledValueLcl.sampledValue[index].value > maxConsumption || debug) {
+            logger.error(`${self._logPrefix()} MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'}: connectorId ${connectorId}, transaction ${connector.transactionId}, value: ${sampledValueLcl.sampledValue[index].value}/${maxConsumption}`);
+          }
+        // Unsupported measurand
+        } else {
+          logger.info(`${self._logPrefix()} Unsupported MeterValues measurand ${sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register'} on connectorId ${connectorId}`);
+        }
+      }
+
+      const payload = {
+        connectorId,
+        transactionId: self.getConnector(connectorId).transactionId,
+        meterValue: [sampledValueLcl],
+      };
+      await self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
+    } catch (error) {
+      logger.error(self._logPrefix() + ' Send MeterValues error: ' + error);
+      throw error;
+    }
   }
 
   sendError(messageId, err) {
     // Check exception: only OCPP error are accepted
-    const error = (err instanceof OCPPError ? err : new OCPPError(OCPP_ERROR_INTERNAL_ERROR, err.message));
+    const error = err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message);
     // Send error
-    return this.sendMessage(messageId, error, OCPP_JSON_CALL_ERROR_MESSAGE);
+    return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE);
   }
 
-  sendMessage(messageId, command, messageType = OCPP_JSON_CALL_RESULT_MESSAGE, commandName = '') {
+  sendMessage(messageId, command, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName = '') {
     // Send a message through wsConnection
     const self = this;
     // Create a promise
@@ -291,32 +675,33 @@ class ChargingStation {
       // Type of message
       switch (messageType) {
         // Request
-        case OCPP_JSON_CALL_MESSAGE:
-          this._statistics.addMessage(commandName);
+        case Constants.OCPP_JSON_CALL_MESSAGE:
+          if (this.getEnableStatistics()) {
+            this._statistics.addMessage(commandName);
+          }
           // Build request
           this._requests[messageId] = [responseCallback, rejectCallback, command];
           messageToSend = JSON.stringify([messageType, messageId, commandName, command]);
           break;
         // Response
-        case OCPP_JSON_CALL_RESULT_MESSAGE:
+        case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
+          if (this.getEnableStatistics()) {
+            this._statistics.addMessage(commandName);
+          }
           // Build response
           messageToSend = JSON.stringify([messageType, messageId, command]);
           break;
         // Error Message
-        case OCPP_JSON_CALL_ERROR_MESSAGE:
+        case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
+          if (this.getEnableStatistics()) {
+            this._statistics.addMessage(`Error ${command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR} on ${commandName}`);
+          }
           // Build Message
-          // eslint-disable-next-line no-case-declarations
-          const {
-            code,
-            message,
-            details,
-          } = command;
-          this._statistics.addMessage(`Error ${code}`);
-          messageToSend = JSON.stringify([messageType, messageId, code, message, details]);
+          messageToSend = JSON.stringify([messageType, messageId, command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR, command.message ? command.message : '', command.details ? command.details : {}]);
           break;
       }
-      // Check if wsConnection in ready
-      if (this._wsConnection.readyState === WebSocket.OPEN) {
+      // Check if wsConnection is ready
+      if (this._wsConnection && this._wsConnection.readyState === WebSocket.OPEN) {
         // Yes: Send Message
         this._wsConnection.send(messageToSend);
       } else {
@@ -324,23 +709,25 @@ class ChargingStation {
         this._messageQueue.push(messageToSend);
       }
       // Request?
-      if (messageType !== OCPP_JSON_CALL_MESSAGE) {
+      if (messageType !== Constants.OCPP_JSON_CALL_MESSAGE) {
         // Yes: send Ok
         resolve();
-      } else if (this._wsConnection.readyState === WebSocket.OPEN) {
+      } else if (this._wsConnection && this._wsConnection.readyState === WebSocket.OPEN) {
         // Send timeout in case connection is open otherwise wait for ever
         // FIXME: Handle message on timeout
-        setTimeout(() => rejectCallback(`Timeout for message ${messageId}`), OCPP_SOCKET_TIMEOUT);
+        setTimeout(() => rejectCallback(`Timeout for message ${messageId}`), Constants.OCPP_SOCKET_TIMEOUT);
       }
 
       // Function that will receive the request's response
       function responseCallback(payload, requestPayload) {
-        self._statistics.addMessage(commandName, true);
+        if (self.getEnableStatistics()) {
+          self._statistics.addMessage(commandName, true);
+        }
         const responseCallbackFn = 'handleResponse' + commandName;
         if (typeof self[responseCallbackFn] === 'function') {
           self[responseCallbackFn](payload, requestPayload, self);
         } else {
-          // logger.error(this._basicFormatLog() + ' Trying to call an undefined callback function: ' + responseCallbackFn)
+          logger.debug(self._logPrefix() + ' Trying to call an undefined response callback function: ' + responseCallbackFn);
         }
         // Send the response
         resolve(payload);
@@ -348,6 +735,9 @@ class ChargingStation {
 
       // Function that will receive the request's rejection
       function rejectCallback(reason) {
+        if (self.getEnableStatistics()) {
+          self._statistics.addMessage(`Error ${command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR} on ${commandName}`, true);
+        }
         // Build Exception
         // eslint-disable-next-line no-empty-function
         self._requests[messageId] = [() => { }, () => { }, '']; // Properly format the request
@@ -361,123 +751,108 @@ class ChargingStation {
   handleResponseBootNotification(payload) {
     if (payload.status === 'Accepted') {
       this._heartbeatInterval = payload.interval * 1000;
-      this.basicStartMessageSequence();
+      this._addConfigurationKey('HeartBeatInterval', Utils.convertToInt(payload.interval));
+      this._addConfigurationKey('HeartbeatInterval', Utils.convertToInt(payload.interval), false, false);
+      this._basicStartMessageSequence();
+    } else if (payload.status === 'Pending') {
+      logger.info(this._logPrefix() + ' Charging station pending on the central server');
+    } else {
+      logger.info(this._logPrefix() + ' Charging station rejected by the central server');
     }
   }
 
-  async basicStartMessageSequence() {
-    this._startHeartbeat(this);
-    if (!this._connectors) { // build connectors
-      this._connectors = {};
-      const connectorsConfig = JSON.parse(JSON.stringify(this._stationInfo.Connectors));
-      // determine number of customized connectors
-      let lastConnector;
-      for (lastConnector in connectorsConfig) {
-        if (lastConnector === 0 && this._stationInfo.usedConnectorId0) {
-          this._connectors[lastConnector] = connectorsConfig[lastConnector];
-        }
-      }
-      let maxConnectors = 0;
-      if (Array.isArray(this._stationInfo.numberOfConnectors)) {
-        // generate some connectors
-        maxConnectors = this._stationInfo.numberOfConnectors[(this._index - 1) % this._stationInfo.numberOfConnectors.length];
-      } else {
-        maxConnectors = this._stationInfo.numberOfConnectors;
-      }
-      // generate all connectors
-      for (let index = 1; index <= maxConnectors; index++) {
-        const randConnectorID = (this._stationInfo.randomConnectors ? Utils.getRandomInt(lastConnector, 1) : index);
-        this._connectors[index] = connectorsConfig[randConnectorID];
-      }
+  _initTransactionOnConnector(connectorId) {
+    this.getConnector(connectorId).transactionStarted = false;
+    this.getConnector(connectorId).transactionId = null;
+    this.getConnector(connectorId).idTag = null;
+    this.getConnector(connectorId).lastEnergyActiveImportRegisterValue = -1;
+  }
+
+  _resetTransactionOnConnector(connectorId) {
+    this._initTransactionOnConnector(connectorId);
+    if (this.getConnector(connectorId).transactionSetInterval) {
+      clearInterval(this.getConnector(connectorId).transactionSetInterval);
+    }
+  }
+
+  handleResponseStartTransaction(payload, requestPayload) {
+    if (this.getConnector(requestPayload.connectorId).transactionStarted) {
+      logger.debug(this._logPrefix() + ' Try to start a transaction on an already used connector ' + requestPayload.connectorId + ': %s', this.getConnector(requestPayload.connectorId));
+      return;
     }
 
+    let transactionConnectorId;
     for (const connector in this._connectors) {
-      if (!this._connectors[connector].transactionStarted) {
-        if (this._connectors[connector].bootStatus) {
-          setTimeout(() => this.sendStatusNotification(connector, this._connectors[connector].bootStatus), 500);
-        } else {
-          setTimeout(() => this.sendStatusNotification(connector, 'Available'), 500);
-        }
-      } else {
-        setTimeout(() => this.sendStatusNotification(connector, 'Charging'), 500);
+      if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
+        transactionConnectorId = connector;
+        break;
       }
     }
-
-    if (this._stationInfo.AutomaticTransactionGenerator.enable) {
-      if (!this._automaticTransactionGeneration) {
-        this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
+    if (!transactionConnectorId) {
+      logger.error(this._logPrefix() + ' Try to start a transaction on a non existing connector Id ' + requestPayload.connectorId);
+      return;
+    }
+    if (payload.idTagInfo && payload.idTagInfo.status === 'Accepted') {
+      this.getConnector(requestPayload.connectorId).transactionStarted = true;
+      this.getConnector(requestPayload.connectorId).transactionId = payload.transactionId;
+      this.getConnector(requestPayload.connectorId).idTag = requestPayload.idTag;
+      this.getConnector(requestPayload.connectorId).lastEnergyActiveImportRegisterValue = 0;
+      this.sendStatusNotification(requestPayload.connectorId, 'Charging');
+      logger.info(this._logPrefix() + ' Transaction ' + payload.transactionId + ' STARTED on ' + this._stationInfo.name + '#' + requestPayload.connectorId + ' for idTag ' + requestPayload.idTag);
+      if (this._stationInfo.powerSharedByConnectors) {
+        this._stationInfo.powerDivider++;
       }
-      this._automaticTransactionGeneration.start();
+      const configuredMeterValueSampleInterval = this._getConfigurationKey('MeterValueSampleInterval');
+      this._startMeterValues(requestPayload.connectorId,
+        configuredMeterValueSampleInterval ? configuredMeterValueSampleInterval.value * 1000 : 60000);
+    } else {
+      logger.error(this._logPrefix() + ' Starting transaction id ' + payload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
+      this._resetTransactionOnConnector(requestPayload.connectorId);
+      this.sendStatusNotification(requestPayload.connectorId, 'Available');
     }
-    this._statistics.start();
   }
 
-  handleResponseStartTransaction(payload, requestPayload) {
-    this._connectors[requestPayload.connectorId] = {
-      transactionStarted: false,
-      idTag: requestPayload.idTag,
-    };
-    if (payload.idTagInfo.status === 'Accepted') {
-      for (const connector in this._connectors) {
-        if (connector === requestPayload.connectorId) {
-          this._connectors[connector].transactionStarted = true;
-          this._connectors[connector].transactionId = payload.transactionId;
-          this._connectors[connector].lastConsumptionValue = 0;
-          this._connectors[connector].lastSoC = 0;
-          logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connector].transactionId + ' STARTED on ' + this._stationInfo.name + '#' + requestPayload.connectorId);
-          this.sendStatusNotification(requestPayload.connectorId, 'Charging');
-          const configuredMeterInterval = this._configuration.configurationKey.find((value) => value.key === 'meterValueInterval');
-          this.startMeterValues(requestPayload.connectorId,
-              (configuredMeterInterval ? configuredMeterInterval.value * 1000 : 60000),
-              this);
-        }
+  handleResponseStopTransaction(payload, requestPayload) {
+    let transactionConnectorId;
+    for (const connector in this._connectors) {
+      if (this.getConnector(connector).transactionId === requestPayload.transactionId) {
+        transactionConnectorId = connector;
+        break;
       }
-    } else {
-      logger.error(this._basicFormatLog() + ' Starting transaction id ' + payload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
-      for (const connector in this._connectors) {
-        if (connector === requestPayload.connectorId) {
-          this._resetTransactionOnConnector(connector);
-        }
+    }
+    if (!transactionConnectorId) {
+      logger.error(this._logPrefix() + ' Try to stop a non existing transaction ' + requestPayload.transactionId);
+      return;
+    }
+    if (payload.idTagInfo && payload.idTagInfo.status === 'Accepted') {
+      this.sendStatusNotification(transactionConnectorId, 'Available');
+      if (this._stationInfo.powerSharedByConnectors) {
+        this._stationInfo.powerDivider--;
       }
-      this.sendStatusNotification(requestPayload.connectorId, 'Available');
+      logger.info(this._logPrefix() + ' Transaction ' + requestPayload.transactionId + ' STOPPED on ' + this._stationInfo.name + '#' + transactionConnectorId);
+      this._resetTransactionOnConnector(transactionConnectorId);
+    } else {
+      logger.error(this._logPrefix() + ' Stopping transaction id ' + requestPayload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status);
     }
   }
 
-  async sendStatusNotification(connectorId, status, errorCode = 'NoError') {
-    try {
-      const payload = {
-        connectorId,
-        errorCode,
-        status,
-      };
-      await this.sendMessage(uuid(), payload, OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
-    } catch (error) {
-      logger.error(this._basicFormatLog() + ' Send status error: ' + error);
-    }
+  handleResponseStatusNotification(payload, requestPayload) {
+    logger.debug(this._logPrefix() + ' Status notification response received: %j to StatusNotification request: %j', payload, requestPayload);
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  async _startHeartbeat(self) {
-    if (self._heartbeatInterval && !self._heartbeatSetInterval) {
-      logger.info(self._basicFormatLog() + ' Heartbeat started every ' + self._heartbeatInterval + 'ms');
-      self._heartbeatSetInterval = setInterval(() => {
-        try {
-          const payload = {
-            currentTime: new Date().toISOString(),
-          };
-          self.sendMessage(uuid(), payload, OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
-        } catch (error) {
-          logger.error(self._basicFormatLog() + ' Send heartbeat error: ' + error);
-        }
-      }, self._heartbeatInterval);
-    } else {
-      logger.error(self._basicFormatLog() + ' Heartbeat interval undefined, not starting the heartbeat');
-    }
+  handleResponseMeterValues(payload, requestPayload) {
+    logger.debug(this._logPrefix() + ' MeterValues response received: %j to MeterValues request: %j', payload, requestPayload);
+  }
+
+  handleResponseHeartbeat(payload, requestPayload) {
+    logger.debug(this._logPrefix() + ' Heartbeat response received: %j to Heartbeat request: %j', payload, requestPayload);
   }
 
   async handleRequest(messageId, commandName, commandPayload) {
+    if (this.getEnableStatistics()) {
+      this._statistics.addMessage(commandName, true);
+    }
     let result;
-    this._statistics.addMessage(commandName, true);
     // Call
     if (typeof this['handle' + commandName] === 'function') {
       try {
@@ -485,192 +860,162 @@ class ChargingStation {
         result = await this['handle' + commandName](commandPayload);
       } catch (error) {
         // Log
-        logger.error(this._basicFormatLog() + ' Handle request error: ' + error);
-        // Send back response to inform back end
+        logger.error(this._logPrefix() + ' Handle request error: ' + error);
+        // Send back response to inform backend
         await this.sendError(messageId, error);
       }
     } else {
-      // Throw Exception
-      await this.sendError(messageId, new OCPPError(OCPP_ERROR_NOT_IMPLEMENTED, 'Not implemented', {}));
+      // Throw exception
+      await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, 'Not implemented', {}));
       throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
     }
-    // Send Response
-    await this.sendMessage(messageId, result, OCPP_JSON_CALL_RESULT_MESSAGE);
-  }
-
-  async handleGetConfiguration() {
-    return this._configuration;
+    // Send response
+    await this.sendMessage(messageId, result, Constants.OCPP_JSON_CALL_RESULT_MESSAGE);
   }
 
-  async handleChangeConfiguration(commandPayload) {
-    const keyToChange = this._configuration.configurationKey.find((element) => element.key === commandPayload.key);
-    if (keyToChange) {
-      keyToChange.value = commandPayload.value;
-      return {
-        status: 'Accepted',
-      };
-    }
-    return {
-      status: 'Rejected',
-    };
-  }
-
-  async handleRemoteStartTransaction(commandPayload) {
-    const transactionConnectorID = (commandPayload.connectorId ? commandPayload.connectorId : '1');
-    if (this.isAuthorizationRequested() && this._authorizeRemoteTxRequests) {
-      // check if authorized
-      if (this._authorizedKeys.find((value) => value === commandPayload.idTag)) {
-        // Authorization successful start transaction
-        setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), 500);
-        return {
-          status: 'Accepted',
-        };
-      }
-      // Start authorization checks
-      return {
-        status: 'Rejected',
-      };
-    }
-    // no local authorization check required => start transaction
-    setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), 500);
-    return {
-      status: 'Accepted',
-    };
+  async handleReset(commandPayload) {
+    // Simulate charging station restart
+    setImmediate(async () => {
+      await this.stop(commandPayload.type + 'Reset');
+      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 ${this._stationInfo.resetTime}ms`);
+    return Constants.OCPP_RESPONSE_ACCEPTED;
   }
 
-  async sendStartTransaction(connectorID, idTag) {
-    try {
-      const payload = {
-        connectorId: connectorID,
-        idTag,
-        meterStart: 0,
-        timestamp: new Date().toISOString(),
-      };
-      return await this.sendMessage(uuid(), payload, OCPP_JSON_CALL_MESSAGE, 'StartTransaction');
-    } catch (error) {
-      logger.error(this._basicFormatLog() + ' Send start transaction error: ' + error);
-      this._resetTransactionOnConnector(connectorID);
-      throw error;
-    }
+  _getConfigurationKey(key) {
+    return this._configuration.configurationKey.find((configElement) => configElement.key === key);
   }
 
-  async sendStopTransaction(transactionId, connectorID) {
-    try {
-      const payload = {
-        transactionId,
-        meterStop: 0,
-        timestamp: new Date().toISOString(),
-      };
-      await this.sendMessage(uuid(), payload, OCPP_JSON_CALL_MESSAGE, 'StopTransaction');
-      logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connectorID].transactionId + ' STOPPED on ' + this._stationInfo.name + '#' + connectorID);
-      this.sendStatusNotification(connectorID, 'Available');
-    } catch (error) {
-      logger.error(this._basicFormatLog() + ' Send stop transaction error: ' + error);
-      throw error;
-    } finally {
-      this._resetTransactionOnConnector(connectorID);
+  _addConfigurationKey(key, value, readonly = false, visible = true, reboot = false) {
+    const keyFound = this._getConfigurationKey(key);
+    if (!keyFound) {
+      this._configuration.configurationKey.push({
+        key,
+        readonly,
+        value,
+        visible,
+        reboot,
+      });
     }
   }
 
-  _resetTransactionOnConnector(connectorID) {
-    this._connectors[connectorID].transactionStarted = false;
-    this._connectors[connectorID].transactionId = null;
-    this._connectors[connectorID].lastConsumptionValue = -1;
-    this._connectors[connectorID].lastSoC = -1;
-    if (this._connectors[connectorID].transactionInterval) {
-      clearInterval(this._connectors[connectorID].transactionInterval);
+  _setConfigurationKeyValue(key, value) {
+    const keyFound = this._getConfigurationKey(key);
+    if (keyFound) {
+      const keyIndex = this._configuration.configurationKey.indexOf(keyFound);
+      this._configuration.configurationKey[keyIndex].value = value;
     }
   }
 
-  // eslint-disable-next-line class-methods-use-this
-  async sendMeterValues(connectorID, interval, self) {
-    try {
-      const sampledValueLcl = {
-        timestamp: new Date().toISOString(),
-      };
-      const meterValuesClone = JSON.parse(JSON.stringify(self._getConnector(connectorID).MeterValues));
-      if (Array.isArray(meterValuesClone)) {
-        sampledValueLcl.sampledValue = meterValuesClone;
-      } else {
-        sampledValueLcl.sampledValue = [meterValuesClone];
-      }
-      for (let index = 0; index < sampledValueLcl.sampledValue.length; index++) {
-        if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'SoC') {
-          sampledValueLcl.sampledValue[index].value = Math.floor(Math.random() * 100) + 1;
-          if (sampledValueLcl.sampledValue[index].value > 100) {
-            logger.info(self._basicFormatLog() + ' Meter type: ' +
-              (sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'default') +
-              ' value: ' + sampledValueLcl.sampledValue[index].value);
-          }
+  async handleGetConfiguration(commandPayload) {
+    const configurationKey = [];
+    const unknownKey = [];
+    if (Utils.isEmptyArray(commandPayload.key)) {
+      for (const configuration of this._configuration.configurationKey) {
+        if (Utils.isUndefined(configuration.visible)) {
+          configuration.visible = true;
         } else {
-          // Persist previous value in connector
-          const connector = self._connectors[connectorID];
-          let consumption;
-          consumption = Utils.getRandomInt(self._stationInfo.maxPower / 3600000 * interval, 3);
-          if (connector && connector.lastConsumptionValue >= 0) {
-            connector.lastConsumptionValue += consumption;
+          configuration.visible = Utils.convertToBoolean(configuration.visible);
+        }
+        if (!configuration.visible) {
+          continue;
+        }
+        configurationKey.push({
+          key: configuration.key,
+          readonly: configuration.readonly,
+          value: configuration.value,
+        });
+      }
+    } else {
+      for (const configurationKey of commandPayload.key) {
+        const keyFound = this._getConfigurationKey(configurationKey);
+        if (keyFound) {
+          if (Utils.isUndefined(keyFound.visible)) {
+            keyFound.visible = true;
           } else {
-            connector.lastConsumptionValue = 0;
+            keyFound.visible = Utils.convertToBoolean(configurationKey.visible);
           }
-          consumption = Math.round(connector.lastConsumptionValue * 3600 / interval);
-          logger.info(self._basicFormatLog() + ' ConnectorID ' + connectorID + ' transaction ' + connector.transactionId + ' value ' + connector.lastConsumptionValue);
-          sampledValueLcl.sampledValue[index].value = connector.lastConsumptionValue;
-          if (sampledValueLcl.sampledValue[index].value > (self._stationInfo.maxPower * 3600 / interval) || sampledValueLcl.sampledValue[index].value < 500) {
-            logger.info(self._basicFormatLog() + ' Meter type: ' +
-              (sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'default') +
-              ' value: ' + sampledValueLcl.sampledValue[index].value + '/' + (self._stationInfo.maxPower * 3600 / interval));
+          if (!keyFound.visible) {
+            continue;
           }
+          configurationKey.push({
+            key: keyFound.key,
+            readonly: keyFound.readonly,
+            value: keyFound.value,
+          });
+        } else {
+          unknownKey.push(configurationKey);
         }
       }
+    }
+    return {
+      configurationKey,
+      unknownKey,
+    };
+  }
 
-      const payload = {
-        connectorId: connectorID,
-        transactionId: self._connectors[connectorID].transactionId,
-        meterValue: [sampledValueLcl],
-      };
-      await self.sendMessage(uuid(), payload, OCPP_JSON_CALL_MESSAGE, 'MeterValues');
-    } catch (error) {
-      logger.error(self._basicFormatLog() + ' Send meter values error: ' + error);
+  async handleChangeConfiguration(commandPayload) {
+    const keyToChange = this._getConfigurationKey(commandPayload.key);
+    if (!keyToChange) {
+      return {status: Constants.OCPP_ERROR_NOT_SUPPORTED};
+    } else if (keyToChange && Utils.convertToBoolean(keyToChange.readonly)) {
+      return Constants.OCPP_RESPONSE_REJECTED;
+    } else if (keyToChange && !Utils.convertToBoolean(keyToChange.readonly)) {
+      const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
+      this._configuration.configurationKey[keyIndex].value = commandPayload.value;
+      let triggerHeartbeatRestart = false;
+      if (keyToChange.key === 'HeartBeatInterval') {
+        this._setConfigurationKeyValue('HeartbeatInterval', commandPayload.value);
+        triggerHeartbeatRestart = true;
+      }
+      if (keyToChange.key === 'HeartbeatInterval') {
+        this._setConfigurationKeyValue('HeartBeatInterval', commandPayload.value);
+        triggerHeartbeatRestart = true;
+      }
+      if (triggerHeartbeatRestart) {
+        this._heartbeatInterval = Utils.convertToInt(commandPayload.value) * 1000;
+        // Stop heartbeat
+        this._stopHeartbeat();
+        // Start heartbeat
+        this._startHeartbeat(this);
+      }
+      if (Utils.convertToBoolean(keyToChange.reboot)) {
+        return Constants.OCPP_RESPONSE_REBOOT_REQUIRED;
+      }
+      return Constants.OCPP_RESPONSE_ACCEPTED;
     }
   }
 
-  async startMeterValues(connectorID, interval, self) {
-    // if (!this._connectors[connectorID].transactionStarted) {
-    //   logger.debug(`${self._basicFormatLog()} Trying to start meter values on connector ID ${connectorID} with no transaction`);
-    // } else if (this._connectors[connectorID].transactionStarted && !this._connectors[connectorID].transactionId) {
-    //   logger.debug(`${self._basicFormatLog()} Trying to start meter values on connector ID ${connectorID} with no transaction id`);
-    // }
-    this._connectors[connectorID].transactionInterval = setInterval(async () => {
-      const sendMeterValues = performance.timerify(this.sendMeterValues);
-      this._performanceObserver.observe({
-        entryTypes: ['function'],
-      });
-      await sendMeterValues(connectorID, interval, self);
-    }, interval);
+  async handleRemoteStartTransaction(commandPayload) {
+    const transactionConnectorID = commandPayload.connectorId ? commandPayload.connectorId : '1';
+    if (this.hasAuthorizedTags() && this._getLocalAuthListEnabled() && this._getAuthorizeRemoteTxRequests()) {
+      // Check if authorized
+      if (this._authorizedTags.find((value) => value === commandPayload.idTag)) {
+        // Authorization successful start transaction
+        this.sendStartTransactionWithTimeout(transactionConnectorID, commandPayload.idTag, Constants.START_TRANSACTION_TIMEOUT);
+        logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
+        return Constants.OCPP_RESPONSE_ACCEPTED;
+      }
+      logger.error(this._logPrefix() + ' Remote starting transaction REJECTED with status ' + commandPayload.idTagInfo.status + ', idTag ' + commandPayload.idTag);
+      return Constants.OCPP_RESPONSE_REJECTED;
+    }
+    // No local authorization check required => start transaction
+    this.sendStartTransactionWithTimeout(transactionConnectorID, commandPayload.idTag, Constants.START_TRANSACTION_TIMEOUT);
+    logger.debug(this._logPrefix() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
+    return Constants.OCPP_RESPONSE_ACCEPTED;
   }
 
   async handleRemoteStopTransaction(commandPayload) {
     for (const connector in this._connectors) {
-      if (this._connectors[connector].transactionId === commandPayload.transactionId) {
-        this.sendStopTransaction(commandPayload.transactionId, connector);
+      if (this.getConnector(connector).transactionId === commandPayload.transactionId) {
+        this.sendStopTransaction(commandPayload.transactionId);
+        return Constants.OCPP_RESPONSE_ACCEPTED;
       }
     }
-    return {
-      status: 'Accepted',
-    };
-  }
-
-  isAuthorizationRequested() {
-    return this._authorizedKeys && this._authorizedKeys.length > 0;
-  }
-
-  getRandomTagId() {
-    const index = Math.round(Math.floor(Math.random() * this._authorizedKeys.length - 1));
-    return this._authorizedKeys[index];
-  }
-
-  _getConnector(number) {
-    return this._stationInfo.Connectors[number];
+    logger.info(this._logPrefix() + ' Try to stop remotely a non existing transaction ' + commandPayload.transactionId);
+    return Constants.OCPP_RESPONSE_REJECTED;
   }
 }