src/charging-station/ChargingStation.js

   1 const Configuration = require('../utils/Configuration');
   2 const logger = require('../utils/Logger');
   3 const WebSocket = require('ws');
   4 const Constants = require('../utils/Constants');
   5 const Utils = require('../utils/Utils');
   6 const OCPPError = require('./OcppError');
   7 const AutomaticTransactionGenerator = require('./AutomaticTransactionGenerator');
   8 const Statistics = require('../utils/Statistics');
   9 const fs = require('fs');
  10 const {performance, PerformanceObserver} = require('perf_hooks');
  11
  12 class ChargingStation {
  13   constructor(index, stationTemplateFile) {
  14     this._index = index;
  15     this._stationTemplateFile = stationTemplateFile;
  16     this._initialize();
  17
  18     this._autoReconnectRetryCount = 0;
  19     this._autoReconnectMaxRetries = Configuration.getAutoReconnectMaxRetries(); // -1 for unlimited
  20     this._autoReconnectTimeout = Configuration.getAutoReconnectTimeout() * 1000; // ms, zero for disabling
  21
  22     this._requests = {};
  23     this._messageQueue = [];
  24
  25     this._isSocketRestart = false;
  26
  27     this._authorizedTags = this._getAuthorizedTags();
  28   }
  29
  30   _initialize() {
  31     this._stationInfo = this._buildStationInfo();
  32     this._bootNotificationMessage = {
  33       chargePointModel: this._stationInfo.chargePointModel,
  34       chargePointVendor: this._stationInfo.chargePointVendor,
  35       // chargePointSerialNumber: this._stationInfo.chargePointSerialNumber,
  36       firmwareVersion: this._stationInfo.firmwareVersion ? this._stationInfo.firmwareVersion : '',
  37     };
  38     this._configuration = this._getConfiguration();
  39     this._supervisionUrl = this._getSupervisionURL();
  40     this._statistics = new Statistics(this._stationInfo.name);
  41     this._performanceObserver = new PerformanceObserver((list) => {
  42       const entry = list.getEntries()[0];
  43       this._statistics.logPerformance(entry, 'ChargingStation');
  44       this._performanceObserver.disconnect();
  45     });
  46   }
  47
  48   _basicFormatLog() {
  49     return Utils.basicFormatLog(` ${this._stationInfo.name}:`);
  50   }
  51
  52   _getConfiguration() {
  53     return this._stationInfo.Configuration ? this._stationInfo.Configuration : {};
  54   }
  55
  56   _getAuthorizationFile() {
  57     return this._stationInfo.authorizationFile ? this._stationInfo.authorizationFile : '';
  58   }
  59
  60   _getAuthorizedTags() {
  61     let authorizedTags = [];
  62     const authorizationFile = this._getAuthorizationFile();
  63     if (authorizationFile) {
  64       try {
  65         // Load authorization file
  66         const fileDescriptor = fs.openSync(authorizationFile, 'r');
  67         authorizedTags = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
  68         fs.closeSync(fileDescriptor);
  69       } catch (error) {
  70         logger.error(this._basicFormatLog() + ' Authorization file loading error: ' + error);
  71       }
  72     } else {
  73       logger.info(this._basicFormatLog() + ' No authorization file given in template file ' + this._stationTemplateFile);
  74     }
  75     return authorizedTags;
  76   }
  77
  78   _startAuthorizationFileMonitoring() {
  79     // eslint-disable-next-line no-unused-vars
  80     fs.watchFile(this._getAuthorizationFile(), (current, previous) => {
  81       try {
  82         logger.debug(this._basicFormatLog() + ' Authorization file ' + this._getAuthorizationFile() + ' have changed, reload');
  83         // Initialize _authorizedTags
  84         this._authorizedTags = this._getAuthorizedTags();
  85       } catch (error) {
  86         logger.error(this._basicFormatLog() + ' Authorization file monitoring error: ' + error);
  87       }
  88     });
  89   }
  90
  91   _startStationTemplateFileMonitoring() {
  92     // eslint-disable-next-line no-unused-vars
  93     fs.watchFile(this._stationTemplateFile, (current, previous) => {
  94       try {
  95         logger.debug(this._basicFormatLog() + ' Template file ' + this._stationTemplateFile + ' have changed, reload');
  96         // Initialize
  97         this._initialize();
  98       } catch (error) {
  99         logger.error(this._basicFormatLog() + ' Charging station template file monitoring error: ' + error);
 100       }
 101     });
 102   }
 103
 104   _getSupervisionURL() {
 105     const supervisionUrls = Utils.cloneJSonDocument(this._stationInfo.supervisionURL ? this._stationInfo.supervisionURL : Configuration.getSupervisionURLs());
 106     let indexUrl = 0;
 107     if (Array.isArray(supervisionUrls)) {
 108       if (Configuration.getDistributeStationToTenantEqually()) {
 109         indexUrl = this._index % supervisionUrls.length;
 110       } else {
 111         // Get a random url
 112         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
 113       }
 114       return supervisionUrls[indexUrl];
 115     }
 116     return supervisionUrls;
 117   }
 118
 119   _getStationName(stationTemplate) {
 120     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + this._index).substr(('000000000' + this._index).length - 4);
 121   }
 122
 123   _getAuthorizeRemoteTxRequests() {
 124     const authorizeRemoteTxRequests = this._configuration.configurationKey.find((configElement) => configElement.key === 'AuthorizeRemoteTxRequests');
 125     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
 126   }
 127
 128   _getLocalAuthListEnabled() {
 129     const localAuthListEnabled = this._configuration.configurationKey.find((configElement) => configElement.key === 'LocalAuthListEnabled');
 130     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
 131   }
 132
 133   _buildStationInfo() {
 134     let stationTemplateFromFile;
 135     try {
 136       // Load template file
 137       const fileDescriptor = fs.openSync(this._stationTemplateFile, 'r');
 138       stationTemplateFromFile = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
 139       fs.closeSync(fileDescriptor);
 140     } catch (error) {
 141       logger.error(this._basicFormatLog() + ' Template file loading error: ' + error);
 142     }
 143     const stationTemplate = stationTemplateFromFile || {};
 144     if (Array.isArray(stationTemplateFromFile.power)) {
 145       stationTemplate.maxPower = stationTemplateFromFile.power[Math.floor(Math.random() * stationTemplateFromFile.power.length)];
 146     } else {
 147       stationTemplate.maxPower = stationTemplateFromFile.power;
 148     }
 149     stationTemplate.name = this._getStationName(stationTemplateFromFile);
 150     return stationTemplate;
 151   }
 152
 153   async start() {
 154     this._url = this._supervisionUrl + '/' + this._stationInfo.name;
 155     this._wsConnection = new WebSocket(this._url, 'ocpp1.6');
 156     logger.info(this._basicFormatLog() + ' Will communicate with ' + this._supervisionUrl);
 157     // Monitor authorization file
 158     this._startAuthorizationFileMonitoring();
 159     // Monitor station template file
 160     this._startStationTemplateFileMonitoring();
 161     // Handle Socket incoming messages
 162     this._wsConnection.on('message', this.onMessage.bind(this));
 163     // Handle Socket error
 164     this._wsConnection.on('error', this.onError.bind(this));
 165     // Handle Socket close
 166     this._wsConnection.on('close', this.onClose.bind(this));
 167     // Handle Socket opening connection
 168     this._wsConnection.on('open', this.onOpen.bind(this));
 169     // Handle Socket ping
 170     this._wsConnection.on('ping', this.onPing.bind(this));
 171   }
 172
 173   onOpen() {
 174     logger.info(`${this._basicFormatLog()} Is connected to server through ${this._url}`);
 175     if (!this._heartbeatInterval) {
 176       // Send BootNotification
 177       try {
 178         this.sendMessage(Utils.generateUUID(), this._bootNotificationMessage, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification');
 179       } catch (error) {
 180         logger.error(this._basicFormatLog() + ' Send boot notification error: ' + error);
 181       }
 182     }
 183     if (this._isSocketRestart) {
 184       this._basicStartMessageSequence();
 185       if (this._messageQueue.length > 0) {
 186         this._messageQueue.forEach((message) => {
 187           if (this._wsConnection.readyState === WebSocket.OPEN) {
 188             this._wsConnection.send(message);
 189           }
 190         });
 191       }
 192     }
 193     this._autoReconnectRetryCount = 0;
 194     this._isSocketRestart = false;
 195   }
 196
 197   onError(error) {
 198     switch (error) {
 199       case 'ECONNREFUSED':
 200         this._isSocketRestart = true;
 201         this._reconnect(error);
 202         break;
 203       default:
 204         logger.error(this._basicFormatLog() + ' Socket error: ' + error);
 205         break;
 206     }
 207   }
 208
 209   onClose(error) {
 210     switch (error) {
 211       case 1000: // Normal close
 212       case 1005:
 213         logger.info(this._basicFormatLog() + ' Socket normally closed ' + error);
 214         this._autoReconnectRetryCount = 0;
 215         break;
 216       default: // Abnormal close
 217         this._isSocketRestart = true;
 218         this._reconnect(error);
 219         break;
 220     }
 221   }
 222
 223   onPing() {
 224     logger.debug(this._basicFormatLog() + ' Has received a WS ping (rfc6455) from the server');
 225   }
 226
 227   async onMessage(message) {
 228     let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
 229     try {
 230       // Parse the message
 231       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(message);
 232
 233       // Check the Type of message
 234       switch (messageType) {
 235         // Incoming Message
 236         case Constants.OCPP_JSON_CALL_MESSAGE:
 237           // Process the call
 238           this._statistics.addMessage(commandName);
 239           await this.handleRequest(messageId, commandName, commandPayload);
 240           break;
 241         // Outcome Message
 242         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 243           // Respond
 244           // eslint-disable-next-line no-case-declarations
 245           let responseCallback; let requestPayload;
 246           if (Utils.isIterable(this._requests[messageId])) {
 247             [responseCallback, , requestPayload] = this._requests[messageId];
 248           } else {
 249             throw new Error(`Response request for unknown message id ${messageId} is not iterable`);
 250           }
 251           if (!responseCallback) {
 252             // Error
 253             throw new Error(`Response for unknown message id ${messageId}`);
 254           }
 255           delete this._requests[messageId];
 256           // this._statistics.addMessage(commandName)
 257           responseCallback(commandName, requestPayload);
 258           break;
 259         // Error Message
 260         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 261           if (!this._requests[messageId]) {
 262             // Error
 263             throw new Error(`Error for unknown message id ${messageId}`);
 264           }
 265           // eslint-disable-next-line no-case-declarations
 266           let rejectCallback;
 267           if (Utils.isIterable(this._requests[messageId])) {
 268             [, rejectCallback] = this._requests[messageId];
 269           } else {
 270             throw new Error(`Error request for unknown message id ${messageId} is not iterable`);
 271           }
 272           delete this._requests[messageId];
 273           rejectCallback(new OCPPError(commandName, commandPayload, errorDetails));
 274           break;
 275         // Error
 276         default:
 277           throw new Error(`Wrong message type ${messageType}`);
 278       }
 279     } catch (error) {
 280       // Log
 281       logger.error('%s Incoming message %j processing error %s on request content %s', this._basicFormatLog(), message, error, this._requests[messageId]);
 282       // Send error
 283       // await this.sendError(messageId, error);
 284     }
 285   }
 286
 287   // eslint-disable-next-line class-methods-use-this
 288   async _startHeartbeat(self) {
 289     if (self._heartbeatInterval && !self._heartbeatSetInterval) {
 290       self._heartbeatSetInterval = setInterval(() => {
 291         try {
 292           const payload = {
 293             currentTime: new Date().toISOString(),
 294           };
 295           self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
 296         } catch (error) {
 297           logger.error(self._basicFormatLog() + ' Send heartbeat error: ' + error);
 298         }
 299       }, self._heartbeatInterval);
 300       logger.info(self._basicFormatLog() + ' Heartbeat started every ' + self._heartbeatInterval + 'ms');
 301     } else {
 302       logger.error(self._basicFormatLog() + ' Heartbeat interval undefined, not starting the heartbeat');
 303     }
 304   }
 305
 306   _reconnect(error) {
 307     logger.error(this._basicFormatLog() + ' Socket: abnormally closed', error);
 308     // Stop heartbeat interval
 309     if (this._heartbeatSetInterval) {
 310       clearInterval(this._heartbeatSetInterval);
 311       this._heartbeatSetInterval = null;
 312     }
 313     // Stop the ATG if needed
 314     if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable) &&
 315       Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.stopOnConnectionFailure) &&
 316       this._automaticTransactionGeneration &&
 317       !this._automaticTransactionGeneration.timeToStop) {
 318       this._automaticTransactionGeneration.stop();
 319     }
 320     if (this._autoReconnectTimeout !== 0 &&
 321       (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1)) {
 322       logger.error(`${this._basicFormatLog()} Socket: connection retry with timeout ${this._autoReconnectTimeout}ms`);
 323       this._autoReconnectRetryCount++;
 324       setTimeout(() => {
 325         logger.error(this._basicFormatLog() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount);
 326         this.start();
 327       }, this._autoReconnectTimeout);
 328     } else if (this._autoReconnectTimeout !== 0 || this._autoReconnectMaxRetries !== -1) {
 329       logger.error(`${this._basicFormatLog()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectTimeout})`);
 330     }
 331   }
 332
 333   send(command, messageType = Constants.OCPP_JSON_CALL_MESSAGE) {
 334     // Send Message
 335     return this.sendMessage(Utils.generateUUID(), command, messageType);
 336   }
 337
 338   sendError(messageId, err) {
 339     // Check exception: only OCPP error are accepted
 340     const error = err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message);
 341     // Send error
 342     return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE);
 343   }
 344
 345   async sendStatusNotification(connectorId, status, errorCode = 'NoError') {
 346     try {
 347       const payload = {
 348         connectorId,
 349         errorCode,
 350         status,
 351       };
 352       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
 353     } catch (error) {
 354       logger.error(this._basicFormatLog() + ' Send status error: ' + error);
 355     }
 356   }
 357
 358   async sendStatusNotificationWithTimeout(connectorId, status, errorCode = 'NoError', timeout = Constants.STATUS_NOTIFICATION_TIMEOUT) {
 359     setTimeout(() => this.sendStatusNotification(connectorId, status, errorCode), timeout);
 360   }
 361
 362   sendMessage(messageId, command, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName = '') {
 363     // Send a message through wsConnection
 364     const self = this;
 365     // Create a promise
 366     return new Promise((resolve, reject) => {
 367       let messageToSend;
 368       // Type of message
 369       switch (messageType) {
 370         // Request
 371         case Constants.OCPP_JSON_CALL_MESSAGE:
 372           this._statistics.addMessage(commandName);
 373           // Build request
 374           this._requests[messageId] = [responseCallback, rejectCallback, command];
 375           messageToSend = JSON.stringify([messageType, messageId, commandName, command]);
 376           break;
 377         // Response
 378         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 379           // Build response
 380           messageToSend = JSON.stringify([messageType, messageId, command]);
 381           break;
 382         // Error Message
 383         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 384           // Build Message
 385           this._statistics.addMessage(`Error ${command.code}`);
 386           messageToSend = JSON.stringify([messageType, messageId, command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR, command.message ? command.message : '', command.details ? command.details : {}]);
 387           break;
 388       }
 389       // Check if wsConnection is ready
 390       if (this._wsConnection.readyState === WebSocket.OPEN) {
 391         // Yes: Send Message
 392         this._wsConnection.send(messageToSend);
 393       } else {
 394         // Buffer message until connection is back
 395         this._messageQueue.push(messageToSend);
 396       }
 397       // Request?
 398       if (messageType !== Constants.OCPP_JSON_CALL_MESSAGE) {
 399         // Yes: send Ok
 400         resolve();
 401       } else if (this._wsConnection.readyState === WebSocket.OPEN) {
 402         // Send timeout in case connection is open otherwise wait for ever
 403         // FIXME: Handle message on timeout
 404         setTimeout(() => rejectCallback(`Timeout for message ${messageId}`), Constants.OCPP_SOCKET_TIMEOUT);
 405       }
 406
 407       // Function that will receive the request's response
 408       function responseCallback(payload, requestPayload) {
 409         self._statistics.addMessage(commandName, true);
 410         const responseCallbackFn = 'handleResponse' + commandName;
 411         if (typeof self[responseCallbackFn] === 'function') {
 412           self[responseCallbackFn](payload, requestPayload, self);
 413         } else {
 414           logger.debug(self._basicFormatLog() + ' Trying to call an undefined callback function: ' + responseCallbackFn);
 415         }
 416         // Send the response
 417         resolve(payload);
 418       }
 419
 420       // Function that will receive the request's rejection
 421       function rejectCallback(reason) {
 422         // Build Exception
 423         // eslint-disable-next-line no-empty-function
 424         self._requests[messageId] = [() => { }, () => { }, '']; // Properly format the request
 425         const error = reason instanceof OCPPError ? reason : new Error(reason);
 426         // Send error
 427         reject(error);
 428       }
 429     });
 430   }
 431
 432   async _basicStartMessageSequence() {
 433     this._startHeartbeat(this);
 434     // build connectors
 435     if (!this._connectors) {
 436       this._connectors = {};
 437       const connectorsConfig = Utils.cloneJSonDocument(this._stationInfo.Connectors);
 438       // determine number of customized connectors
 439       let lastConnector;
 440       for (lastConnector in connectorsConfig) {
 441         // add connector 0, OCPP specification violation that for example KEBA have
 442         if (Utils.convertToInt(lastConnector) === 0 && Utils.convertToBoolean(this._stationInfo.useConnectorId0)) {
 443           this._connectors[lastConnector] = connectorsConfig[lastConnector];
 444         }
 445       }
 446       let maxConnectors = 0;
 447       if (Array.isArray(this._stationInfo.numberOfConnectors)) {
 448         // generate some connectors
 449         maxConnectors = this._stationInfo.numberOfConnectors[(this._index - 1) % this._stationInfo.numberOfConnectors.length];
 450       } else {
 451         maxConnectors = this._stationInfo.numberOfConnectors;
 452       }
 453       // generate all connectors
 454       for (let index = 1; index <= maxConnectors; index++) {
 455         const randConnectorID = Utils.convertToBoolean(this._stationInfo.randomConnectors) ? Utils.getRandomInt(lastConnector, 1) : index;
 456         this._connectors[index] = connectorsConfig[randConnectorID];
 457       }
 458     }
 459
 460     for (const connector in this._connectors) {
 461       if (!this._connectors[connector].transactionStarted) {
 462         if (this._connectors[connector].bootStatus) {
 463           this.sendStatusNotificationWithTimeout(connector, this._connectors[connector].bootStatus);
 464         } else {
 465           this.sendStatusNotificationWithTimeout(connector, 'Available');
 466         }
 467       } else {
 468         this.sendStatusNotificationWithTimeout(connector, 'Charging');
 469       }
 470     }
 471
 472     if (Utils.convertToBoolean(this._stationInfo.AutomaticTransactionGenerator.enable)) {
 473       if (!this._automaticTransactionGeneration) {
 474         this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 475       }
 476       if (this._automaticTransactionGeneration.timeToStop) {
 477         this._automaticTransactionGeneration.start();
 478       }
 479     }
 480     this._statistics.start();
 481   }
 482
 483   _resetTransactionOnConnector(connectorID) {
 484     this._connectors[connectorID].transactionStarted = false;
 485     this._connectors[connectorID].transactionId = null;
 486     this._connectors[connectorID].lastConsumptionValue = -1;
 487     this._connectors[connectorID].lastSoC = -1;
 488     if (this._connectors[connectorID].transactionInterval) {
 489       clearInterval(this._connectors[connectorID].transactionInterval);
 490     }
 491   }
 492
 493   handleResponseBootNotification(payload) {
 494     if (payload.status === 'Accepted') {
 495       this._heartbeatInterval = payload.interval * 1000;
 496       this._basicStartMessageSequence();
 497     } else {
 498       logger.info(this._basicFormatLog() + ' Boot Notification rejected');
 499     }
 500   }
 501
 502   handleResponseStartTransaction(payload, requestPayload) {
 503     // Set connector transaction related attributes
 504     this._connectors[requestPayload.connectorId].transactionStarted = false;
 505     this._connectors[requestPayload.connectorId].idTag = requestPayload.idTag;
 506
 507     if (payload.idTagInfo.status === 'Accepted') {
 508       for (const connector in this._connectors) {
 509         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 510           this._connectors[connector].transactionStarted = true;
 511           this._connectors[connector].transactionId = payload.transactionId;
 512           this._connectors[connector].lastConsumptionValue = 0;
 513           this._connectors[connector].lastSoC = 0;
 514           logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connector].transactionId + ' STARTED on ' + this._stationInfo.name + '#' + requestPayload.connectorId + ' for idTag ' + requestPayload.idTag);
 515           this.sendStatusNotification(requestPayload.connectorId, 'Charging');
 516           const configuredMeterValueSampleInterval = this._configuration.configurationKey.find((value) => value.key === 'MeterValueSampleInterval');
 517           this.startMeterValues(requestPayload.connectorId,
 518             configuredMeterValueSampleInterval ? configuredMeterValueSampleInterval.value * 1000 : 60000,
 519             this);
 520         }
 521       }
 522     } else {
 523       logger.error(this._basicFormatLog() + ' Starting transaction id ' + payload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
 524       for (const connector in this._connectors) {
 525         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 526           this._resetTransactionOnConnector(connector);
 527         }
 528       }
 529       this.sendStatusNotification(requestPayload.connectorId, 'Available');
 530     }
 531   }
 532
 533   handleResponseStopTransaction(payload, requestPayload) {
 534     if (payload.idTagInfo && payload.idTagInfo.status) {
 535       logger.debug(this._basicFormatLog() + ' Stop transaction ' + requestPayload.transactionId + ' response status: ' + payload.idTagInfo.status);
 536     } else {
 537       logger.debug(this._basicFormatLog() + ' Stop transaction ' + requestPayload.transactionId + ' response status: Unknown');
 538     }
 539   }
 540
 541   handleResponseStatusNotification(payload, requestPayload) {
 542     logger.debug(this._basicFormatLog() + ' Status notification response received: %j to status notification request: %j', payload, requestPayload);
 543   }
 544
 545   handleResponseMeterValues(payload, requestPayload) {
 546     logger.debug(this._basicFormatLog() + ' MeterValues response received: %j to MeterValues request: %j', payload, requestPayload);
 547   }
 548
 549   handleResponseHeartbeat(payload, requestPayload) {
 550     logger.debug(this._basicFormatLog() + ' Heartbeat response received: %j to Heartbeat request: %j', payload, requestPayload);
 551   }
 552
 553   async handleRequest(messageId, commandName, commandPayload) {
 554     let result;
 555     this._statistics.addMessage(commandName, true);
 556     // Call
 557     if (typeof this['handle' + commandName] === 'function') {
 558       try {
 559         // Call the method
 560         result = await this['handle' + commandName](commandPayload);
 561       } catch (error) {
 562         // Log
 563         logger.error(this._basicFormatLog() + ' Handle request error: ' + error);
 564         // Send back response to inform backend
 565         await this.sendError(messageId, error);
 566       }
 567     } else {
 568       // Throw exception
 569       await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, 'Not implemented', {}));
 570       throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
 571     }
 572     // Send response
 573     await this.sendMessage(messageId, result, Constants.OCPP_JSON_CALL_RESULT_MESSAGE);
 574   }
 575
 576   async handleGetConfiguration(commandPayload) {
 577     const configurationKey = [];
 578     const unknownKey = [];
 579     for (const configuration of this._configuration.configurationKey) {
 580       if (Utils.isUndefined(configuration.visible)) {
 581         configuration.visible = true;
 582       } else {
 583         configuration.visible = Utils.convertToBoolean(configuration.visible);
 584       }
 585       if (!configuration.visible) {
 586         continue;
 587       }
 588       configurationKey.push({
 589         key: configuration.key,
 590         readonly: configuration.readonly,
 591         value: configuration.value,
 592       });
 593     }
 594     return {
 595       configurationKey,
 596       unknownKey,
 597     };
 598   }
 599
 600   async handleChangeConfiguration(commandPayload) {
 601     const keyToChange = this._configuration.configurationKey.find((element) => element.key === commandPayload.key);
 602     if (keyToChange && !Utils.convertToBoolean(keyToChange.readonly)) {
 603       const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
 604       this._configuration.configurationKey[keyIndex].value = commandPayload.value;
 605       return Constants.OCPP_RESPONSE_ACCEPTED;
 606     }
 607     return Constants.OCPP_RESPONSE_REJECTED;
 608   }
 609
 610   async handleRemoteStartTransaction(commandPayload) {
 611     const transactionConnectorID = commandPayload.connectorId ? commandPayload.connectorId : '1';
 612     if (this.hasAuthorizedTags() && this._getLocalAuthListEnabled() && this._getAuthorizeRemoteTxRequests()) {
 613       // Check if authorized
 614       if (this._authorizedTags.find((value) => value === commandPayload.idTag)) {
 615         // Authorization successful start transaction
 616         setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), Constants.START_TRANSACTION_TIMEOUT);
 617         logger.debug(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
 618         return Constants.OCPP_RESPONSE_ACCEPTED;
 619       }
 620       logger.error(this._basicFormatLog() + ' Remote starting transaction REJECTED with status ' + commandPayload.idTagInfo.status + ', idTag ' + commandPayload.idTag);
 621       return Constants.OCPP_RESPONSE_REJECTED;
 622     }
 623     // No local authorization check required => start transaction
 624     setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), Constants.START_TRANSACTION_TIMEOUT);
 625     logger.debug(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' for idTag ' + commandPayload.idTag);
 626     return Constants.OCPP_RESPONSE_ACCEPTED;
 627   }
 628
 629   async handleRemoteStopTransaction(commandPayload) {
 630     for (const connector in this._connectors) {
 631       if (this._connectors[connector].transactionId === commandPayload.transactionId) {
 632         this.sendStopTransaction(commandPayload.transactionId, connector);
 633       }
 634     }
 635     return Constants.OCPP_RESPONSE_ACCEPTED;
 636   }
 637
 638   async sendStartTransaction(connectorID, idTag) {
 639     try {
 640       const payload = {
 641         connectorId: connectorID,
 642         idTag,
 643         meterStart: 0,
 644         timestamp: new Date().toISOString(),
 645       };
 646       return await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction');
 647     } catch (error) {
 648       logger.error(this._basicFormatLog() + ' Send start transaction error: ' + error);
 649       this._resetTransactionOnConnector(connectorID);
 650       throw error;
 651     }
 652   }
 653
 654   async sendStopTransaction(transactionId, connectorID) {
 655     try {
 656       const payload = {
 657         transactionId,
 658         meterStop: 0,
 659         timestamp: new Date().toISOString(),
 660       };
 661       await this.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction');
 662       logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connectorID].transactionId + ' STOPPED on ' + this._stationInfo.name + '#' + connectorID);
 663       this.sendStatusNotification(connectorID, 'Available');
 664     } catch (error) {
 665       logger.error(this._basicFormatLog() + ' Send stop transaction error: ' + error);
 666       throw error;
 667     } finally {
 668       this._resetTransactionOnConnector(connectorID);
 669     }
 670   }
 671
 672   // eslint-disable-next-line class-methods-use-this
 673   async sendMeterValues(connectorID, interval, self) {
 674     try {
 675       const sampledValueLcl = {
 676         timestamp: new Date().toISOString(),
 677       };
 678       const meterValuesClone = Utils.cloneJSonDocument(self._getConnector(connectorID).MeterValues);
 679       if (Array.isArray(meterValuesClone)) {
 680         sampledValueLcl.sampledValue = meterValuesClone;
 681       } else {
 682         sampledValueLcl.sampledValue = [meterValuesClone];
 683       }
 684       for (let index = 0; index < sampledValueLcl.sampledValue.length; index++) {
 685         if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'SoC') {
 686           sampledValueLcl.sampledValue[index].value = Math.floor(Math.random() * 100) + 1;
 687           if (sampledValueLcl.sampledValue[index].value > 100) {
 688             logger.info(self._basicFormatLog() + ' MeterValues measurand: ' +
 689               sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register' +
 690               ', value: ' + sampledValueLcl.sampledValue[index].value);
 691           }
 692         } else {
 693           // Persist previous value in connector
 694           const connector = self._connectors[connectorID];
 695           let consumption;
 696           consumption = Utils.getRandomInt(self._stationInfo.maxPower / 3600000 * interval, 4);
 697           if (connector && connector.lastConsumptionValue >= 0) {
 698             connector.lastConsumptionValue += consumption;
 699           } else {
 700             connector.lastConsumptionValue = 0;
 701           }
 702           consumption = Math.round(connector.lastConsumptionValue * 3600 / interval);
 703           logger.info(self._basicFormatLog() + ' MeterValues: connectorID ' + connectorID + ', transaction ' + connector.transactionId + ', value ' + connector.lastConsumptionValue);
 704           sampledValueLcl.sampledValue[index].value = connector.lastConsumptionValue;
 705           if (sampledValueLcl.sampledValue[index].value > (self._stationInfo.maxPower * 3600 / interval) || sampledValueLcl.sampledValue[index].value < 500) {
 706             logger.info(self._basicFormatLog() + ' MeterValues measurand: ' +
 707               sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'Energy.Active.Import.Register' +
 708               ', value: ' + sampledValueLcl.sampledValue[index].value + '/' + (self._stationInfo.maxPower * 3600 / interval));
 709           }
 710         }
 711       }
 712
 713       const payload = {
 714         connectorId: connectorID,
 715         transactionId: self._connectors[connectorID].transactionId,
 716         meterValue: [sampledValueLcl],
 717       };
 718       await self.sendMessage(Utils.generateUUID(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
 719     } catch (error) {
 720       logger.error(self._basicFormatLog() + ' Send MeterValues error: ' + error);
 721     }
 722   }
 723
 724   async startMeterValues(connectorID, interval, self) {
 725     if (!this._connectors[connectorID].transactionStarted) {
 726       logger.debug(`${self._basicFormatLog()} Trying to start MeterValues on connector ID ${connectorID} with no transaction started`);
 727     } else if (this._connectors[connectorID].transactionStarted && !this._connectors[connectorID].transactionId) {
 728       logger.debug(`${self._basicFormatLog()} Trying to start MeterValues on connector ID ${connectorID} with no transaction id`);
 729     }
 730     this._connectors[connectorID].transactionInterval = setInterval(async () => {
 731       const sendMeterValues = performance.timerify(this.sendMeterValues);
 732       this._performanceObserver.observe({
 733         entryTypes: ['function'],
 734       });
 735       await sendMeterValues(connectorID, interval, self);
 736     }, interval);
 737   }
 738
 739   hasAuthorizedTags() {
 740     return Array.isArray(this._authorizedTags) && this._authorizedTags.length > 0;
 741   }
 742
 743   getRandomTagId() {
 744     const index = Math.round(Math.floor(Math.random() * this._authorizedTags.length - 1));
 745     return this._authorizedTags[index];
 746   }
 747
 748   _getConnector(number) {
 749     return this._stationInfo.Connectors[number];
 750   }
 751 }
 752
 753 module.exports = ChargingStation;