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 {v4: uuid} = require('uuid');
   8 const AutomaticTransactionGenerator = require('./AutomaticTransactionGenerator');
   9 const Statistics = require('../utils/Statistics');
  10 const fs = require('fs');
  11 const {performance, PerformanceObserver} = require('perf_hooks');
  12
  13 class ChargingStation {
  14   constructor(index, stationTemplate) {
  15     this._requests = {};
  16     this._autoReconnectRetryCount = 0;
  17     this._autoReconnectMaxRetries = Configuration.getAutoReconnectMaxRetries(); // -1 for unlimited
  18     this._autoReconnectTimeout = Configuration.getAutoReconnectTimeout() * 1000; // ms, zero for disabling
  19     this._isSocketRestart = false;
  20     this._stationInfo = this._buildChargingStation(index, stationTemplate);
  21     this._statistics = new Statistics(this._stationInfo.name);
  22     this._performanceObserver = new PerformanceObserver((list) => {
  23       const entry = list.getEntries()[0];
  24       this._statistics.logPerformance(entry, 'ChargingStation');
  25       this._performanceObserver.disconnect();
  26     });
  27     this._index = index;
  28     this._messageQueue = [];
  29     this._bootNotificationMessage = {
  30       chargePointModel: this._stationInfo.chargePointModel,
  31       chargePointVendor: this._stationInfo.chargePointVendor,
  32     };
  33     this._configuration = this._getConfiguration(stationTemplate);
  34     this._authorizationFile = this._getAuthorizationFile(stationTemplate);
  35     this._supervisionUrl = this._getSupervisionURL(index, stationTemplate);
  36   }
  37
  38   _basicFormatLog() {
  39     return Utils.basicFormatLog(` ${this._stationInfo.name}:`);
  40   }
  41
  42   // eslint-disable-next-line class-methods-use-this
  43   _getConfiguration(stationTemplate) {
  44     return stationTemplate.Configuration ? stationTemplate.Configuration : {};
  45   }
  46
  47   // eslint-disable-next-line class-methods-use-this
  48   _getAuthorizationFile(stationTemplate) {
  49     return stationTemplate.authorizationFile ? stationTemplate.authorizationFile : '';
  50   }
  51
  52   // eslint-disable-next-line class-methods-use-this
  53   _getSupervisionURL(index, stationTemplate) {
  54     const supervisionUrls = JSON.parse(JSON.stringify(stationTemplate.supervisionURL ? stationTemplate.supervisionURL : Configuration.getSupervisionURLs()));
  55     let indexUrl = 0;
  56     if (Array.isArray(supervisionUrls)) {
  57       if (Configuration.getEquallySupervisionDistribution()) {
  58         indexUrl = index % supervisionUrls.length;
  59       } else {
  60         // Get a random url
  61         indexUrl = Math.floor(Math.random() * supervisionUrls.length);
  62       }
  63       return supervisionUrls[indexUrl];
  64     }
  65     return supervisionUrls;
  66   }
  67
  68   // eslint-disable-next-line class-methods-use-this
  69   _getStationName(index, stationTemplate) {
  70     return stationTemplate.fixedName ? stationTemplate.baseName : stationTemplate.baseName + '-' + ('000000000' + index).substr(('000000000' + index).length - 4);
  71   }
  72
  73   _getAuthorizeRemoteTxRequests() {
  74     const authorizeRemoteTxRequests = this._configuration.configurationKey.find((configElement) => configElement.key === 'AuthorizeRemoteTxRequests');
  75     return authorizeRemoteTxRequests ? Utils.convertToBoolean(authorizeRemoteTxRequests.value) : false;
  76   }
  77
  78   _getLocalAuthListEnabled() {
  79     const localAuthListEnabled = this._configuration.configurationKey.find((configElement) => configElement.key === 'LocalAuthListEnabled');
  80     return localAuthListEnabled ? Utils.convertToBoolean(localAuthListEnabled.value) : false;
  81   }
  82
  83   _buildChargingStation(index, stationTemplate) {
  84     if (Array.isArray(stationTemplate.power)) {
  85       stationTemplate.maxPower = stationTemplate.power[Math.floor(Math.random() * stationTemplate.power.length)];
  86     } else {
  87       stationTemplate.maxPower = stationTemplate.power;
  88     }
  89     stationTemplate.name = this._getStationName(index, stationTemplate);
  90     return stationTemplate;
  91   }
  92
  93   async start() {
  94     logger.info(this._basicFormatLog() + ' Will communicate with ' + this._supervisionUrl);
  95     this._url = this._supervisionUrl + '/' + this._stationInfo.name;
  96     this._wsConnection = new WebSocket(this._url, 'ocpp1.6');
  97     if (this._authorizationFile) {
  98       try {
  99         // load file
 100         const fileDescriptor = fs.openSync(this._authorizationFile, 'r');
 101         this._authorizedKeys = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
 102         fs.closeSync(fileDescriptor);
 103         // monitor authorization file
 104         // eslint-disable-next-line no-unused-vars
 105         fs.watchFile(this._authorizationFile, (current, previous) => {
 106           try {
 107             // reload file
 108             const fileDescriptor = fs.openSync(this._authorizationFile, 'r');
 109             this._authorizedKeys = JSON.parse(fs.readFileSync(fileDescriptor, 'utf8'));
 110             fs.closeSync(fileDescriptor);
 111           } catch (error) {
 112             logger.error(this._basicFormatLog() + ' Authorization file error: ' + error);
 113           }
 114         });
 115       } catch (error) {
 116         logger.error(this._basicFormatLog() + ' Authorization file error: ' + error);
 117       }
 118     } else {
 119       logger.info(this._basicFormatLog() + ' No authorization file given in template ' + this._stationInfo.baseName);
 120     }
 121     // Handle Socket incoming messages
 122     this._wsConnection.on('message', this.onMessage.bind(this));
 123     // Handle Socket error
 124     this._wsConnection.on('error', this.onError.bind(this));
 125     // Handle Socket close
 126     this._wsConnection.on('close', this.onClose.bind(this));
 127     // Handle Socket opening connection
 128     this._wsConnection.on('open', this.onOpen.bind(this));
 129     // Handle Socket ping
 130     this._wsConnection.on('ping', this.onPing.bind(this));
 131   }
 132
 133   onOpen() {
 134     logger.info(`${this._basicFormatLog()} Is connected to server through ${this._url}`);
 135     if (this._isSocketRestart) {
 136       this.basicStartMessageSequence();
 137       if (this._messageQueue.length > 0) {
 138         this._messageQueue.forEach((message) => {
 139           if (this._wsConnection.readyState === WebSocket.OPEN) {
 140             this._wsConnection.send(message);
 141           }
 142         });
 143       }
 144     } else {
 145       // At first start, send BootNotification
 146       try {
 147         this.sendMessage(uuid(), this._bootNotificationMessage, Constants.OCPP_JSON_CALL_MESSAGE, 'BootNotification');
 148       } catch (error) {
 149         logger.error(this._basicFormatLog() + ' Send boot notification error: ' + error);
 150       }
 151     }
 152     this._autoReconnectRetryCount = 0;
 153     this._isSocketRestart = false;
 154   }
 155
 156   onError(error) {
 157     switch (error) {
 158       case 'ECONNREFUSED':
 159         this._isSocketRestart = true;
 160         this._reconnect(error);
 161         break;
 162       default:
 163         logger.error(this._basicFormatLog() + ' Socket error: ' + error);
 164         break;
 165     }
 166   }
 167
 168   onClose(error) {
 169     switch (error) {
 170       case 1000: // Normal close
 171       case 1005:
 172         logger.info(this._basicFormatLog() + ' Socket normally closed ' + error);
 173         this._autoReconnectRetryCount = 0;
 174         break;
 175       default: // Abnormal close
 176         this._isSocketRestart = true;
 177         this._reconnect(error);
 178         break;
 179     }
 180   }
 181
 182   onPing() {
 183     logger.info(this._basicFormatLog() + ' Has received a WS ping (rfc6455) from the server');
 184   }
 185
 186   async onMessage(message) {
 187     let [messageType, messageId, commandName, commandPayload, errorDetails] = [0, '', Constants.ENTITY_CHARGING_STATION, '', ''];
 188     try {
 189       // Parse the message
 190       [messageType, messageId, commandName, commandPayload, errorDetails] = JSON.parse(message);
 191
 192       // Check the Type of message
 193       switch (messageType) {
 194         // Incoming Message
 195         case Constants.OCPP_JSON_CALL_MESSAGE:
 196           // Process the call
 197           this._statistics.addMessage(commandName);
 198           await this.handleRequest(messageId, commandName, commandPayload);
 199           break;
 200         // Outcome Message
 201         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 202           // Respond
 203           // eslint-disable-next-line no-case-declarations
 204           let responseCallback; let requestPayload;
 205           if (Utils.isIterable(this._requests[messageId])) {
 206             [responseCallback, , requestPayload] = this._requests[messageId];
 207           } else {
 208             throw new Error(`Response request for unknown message id ${messageId} is not iterable`);
 209           }
 210           if (!responseCallback) {
 211             // Error
 212             throw new Error(`Response for unknown message id ${messageId}`);
 213           }
 214           delete this._requests[messageId];
 215           // this._statistics.addMessage(commandName)
 216           responseCallback(commandName, requestPayload);
 217           break;
 218         // Error Message
 219         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 220           if (!this._requests[messageId]) {
 221             // Error
 222             throw new Error(`Error for unknown message id ${messageId}`);
 223           }
 224           // eslint-disable-next-line no-case-declarations
 225           let rejectCallback;
 226           if (Utils.isIterable(this._requests[messageId])) {
 227             [, rejectCallback] = this._requests[messageId];
 228           } else {
 229             throw new Error(`Error request for unknown message id ${messageId} is not iterable`);
 230           }
 231           delete this._requests[messageId];
 232           rejectCallback(new OCPPError(commandName, commandPayload, errorDetails));
 233           break;
 234         // Error
 235         default:
 236           throw new Error(`Wrong message type ${messageType}`);
 237       }
 238     } catch (error) {
 239       // Log
 240       logger.error('%s Incoming message %j processing error %s on request content %s', this._basicFormatLog(), message, error, this._requests[messageId]);
 241       // Send error
 242       // await this.sendError(messageId, error);
 243     }
 244   }
 245
 246   _reconnect(error) {
 247     logger.error(this._basicFormatLog() + ' Socket: abnormally closed', error);
 248     // Stop heartbeat interval
 249     if (this._heartbeatSetInterval) {
 250       clearInterval(this._heartbeatSetInterval);
 251       this._heartbeatSetInterval = null;
 252     }
 253     // Stop the ATG
 254     if (this._stationInfo.AutomaticTransactionGenerator.enable && this._automaticTransactionGeneration &&
 255       !this._automaticTransactionGeneration._timeToStop) {
 256       this._automaticTransactionGeneration.stop();
 257     }
 258     if (this._autoReconnectTimeout !== 0 &&
 259       (this._autoReconnectRetryCount < this._autoReconnectMaxRetries || this._autoReconnectMaxRetries === -1)) {
 260       logger.error(`${this._basicFormatLog()} Socket: connection retry with timeout ${this._autoReconnectTimeout}ms`);
 261       this._autoReconnectRetryCount++;
 262       setTimeout(() => {
 263         logger.error(this._basicFormatLog() + ' Socket: reconnecting try #' + this._autoReconnectRetryCount);
 264         this.start();
 265       }, this._autoReconnectTimeout);
 266     } else if (this._autoReconnectTimeout !== 0 || this._autoReconnectMaxRetries !== -1) {
 267       logger.error(`${this._basicFormatLog()} Socket: max retries reached (${this._autoReconnectRetryCount}) or retry disabled (${this._autoReconnectTimeout})`);
 268     }
 269   }
 270
 271   send(command, messageType = Constants.OCPP_JSON_CALL_MESSAGE) {
 272     // Send Message
 273     return this.sendMessage(uuid(), command, messageType);
 274   }
 275
 276   sendError(messageId, err) {
 277     // Check exception: only OCPP error are accepted
 278     const error = (err instanceof OCPPError ? err : new OCPPError(Constants.OCPP_ERROR_INTERNAL_ERROR, err.message));
 279     // Send error
 280     return this.sendMessage(messageId, error, Constants.OCPP_JSON_CALL_ERROR_MESSAGE);
 281   }
 282
 283   sendMessage(messageId, command, messageType = Constants.OCPP_JSON_CALL_RESULT_MESSAGE, commandName = '') {
 284     // Send a message through wsConnection
 285     const self = this;
 286     // Create a promise
 287     return new Promise((resolve, reject) => {
 288       let messageToSend;
 289       // Type of message
 290       switch (messageType) {
 291         // Request
 292         case Constants.OCPP_JSON_CALL_MESSAGE:
 293           this._statistics.addMessage(commandName);
 294           // Build request
 295           this._requests[messageId] = [responseCallback, rejectCallback, command];
 296           messageToSend = JSON.stringify([messageType, messageId, commandName, command]);
 297           break;
 298         // Response
 299         case Constants.OCPP_JSON_CALL_RESULT_MESSAGE:
 300           // Build response
 301           messageToSend = JSON.stringify([messageType, messageId, command]);
 302           break;
 303         // Error Message
 304         case Constants.OCPP_JSON_CALL_ERROR_MESSAGE:
 305           // Build Message
 306           this._statistics.addMessage(`Error ${command.code}`);
 307           messageToSend = JSON.stringify([messageType, messageId, command.code ? command.code : Constants.OCPP_ERROR_GENERIC_ERROR, command.message ? command.message : '', command.details ? command.details : {}]);
 308           break;
 309       }
 310       // Check if wsConnection in ready
 311       if (this._wsConnection.readyState === WebSocket.OPEN) {
 312         // Yes: Send Message
 313         this._wsConnection.send(messageToSend);
 314       } else {
 315         // Buffer message until connection is back
 316         this._messageQueue.push(messageToSend);
 317       }
 318       // Request?
 319       if (messageType !== Constants.OCPP_JSON_CALL_MESSAGE) {
 320         // Yes: send Ok
 321         resolve();
 322       } else if (this._wsConnection.readyState === WebSocket.OPEN) {
 323         // Send timeout in case connection is open otherwise wait for ever
 324         // FIXME: Handle message on timeout
 325         setTimeout(() => rejectCallback(`Timeout for message ${messageId}`), Constants.OCPP_SOCKET_TIMEOUT);
 326       }
 327
 328       // Function that will receive the request's response
 329       function responseCallback(payload, requestPayload) {
 330         self._statistics.addMessage(commandName, true);
 331         const responseCallbackFn = 'handleResponse' + commandName;
 332         if (typeof self[responseCallbackFn] === 'function') {
 333           self[responseCallbackFn](payload, requestPayload, self);
 334         } else {
 335           // logger.error(this._basicFormatLog() + ' Trying to call an undefined callback function: ' + responseCallbackFn)
 336         }
 337         // Send the response
 338         resolve(payload);
 339       }
 340
 341       // Function that will receive the request's rejection
 342       function rejectCallback(reason) {
 343         // Build Exception
 344         // eslint-disable-next-line no-empty-function
 345         self._requests[messageId] = [() => { }, () => { }, '']; // Properly format the request
 346         const error = reason instanceof OCPPError ? reason : new Error(reason);
 347         // Send error
 348         reject(error);
 349       }
 350     });
 351   }
 352
 353   handleResponseBootNotification(payload) {
 354     if (payload.status === 'Accepted') {
 355       this._heartbeatInterval = payload.interval * 1000;
 356       this.basicStartMessageSequence();
 357     }
 358   }
 359
 360   async basicStartMessageSequence() {
 361     this._startHeartbeat(this);
 362     if (!this._connectors) { // build connectors
 363       this._connectors = {};
 364       const connectorsConfig = JSON.parse(JSON.stringify(this._stationInfo.Connectors));
 365       // determine number of customized connectors
 366       let lastConnector;
 367       for (lastConnector in connectorsConfig) {
 368         if (Utils.convertToInt(lastConnector) === 0 && this._stationInfo.usedConnectorId0) {
 369           this._connectors[lastConnector] = connectorsConfig[lastConnector];
 370         }
 371       }
 372       let maxConnectors = 0;
 373       if (Array.isArray(this._stationInfo.numberOfConnectors)) {
 374         // generate some connectors
 375         maxConnectors = this._stationInfo.numberOfConnectors[(this._index - 1) % this._stationInfo.numberOfConnectors.length];
 376       } else {
 377         maxConnectors = this._stationInfo.numberOfConnectors;
 378       }
 379       // generate all connectors
 380       for (let index = 1; index <= maxConnectors; index++) {
 381         const randConnectorID = (this._stationInfo.randomConnectors ? Utils.getRandomInt(lastConnector, 1) : index);
 382         this._connectors[index] = connectorsConfig[randConnectorID];
 383       }
 384     }
 385
 386     for (const connector in this._connectors) {
 387       if (!this._connectors[connector].transactionStarted) {
 388         if (this._connectors[connector].bootStatus) {
 389           setTimeout(() => this.sendStatusNotification(connector, this._connectors[connector].bootStatus), 500);
 390         } else {
 391           setTimeout(() => this.sendStatusNotification(connector, 'Available'), 500);
 392         }
 393       } else {
 394         setTimeout(() => this.sendStatusNotification(connector, 'Charging'), 500);
 395       }
 396     }
 397
 398     if (this._stationInfo.AutomaticTransactionGenerator.enable) {
 399       if (!this._automaticTransactionGeneration) {
 400         this._automaticTransactionGeneration = new AutomaticTransactionGenerator(this);
 401       }
 402       this._automaticTransactionGeneration.start();
 403     }
 404     this._statistics.start();
 405   }
 406
 407   handleResponseStartTransaction(payload, requestPayload) {
 408     // Reset connector transaction related attributes
 409     this._connectors[requestPayload.connectorId].transactionStarted = false;
 410     this._connectors[requestPayload.connectorId].idTag = requestPayload.idTag;
 411
 412     if (payload.idTagInfo.status === 'Accepted') {
 413       for (const connector in this._connectors) {
 414         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 415           this._connectors[connector].transactionStarted = true;
 416           this._connectors[connector].transactionId = payload.transactionId;
 417           this._connectors[connector].lastConsumptionValue = 0;
 418           this._connectors[connector].lastSoC = 0;
 419           logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connector].transactionId + ' STARTED on ' + this._stationInfo.name + '#' + requestPayload.connectorId + ' with idTag ' + requestPayload.idTag);
 420           this.sendStatusNotification(requestPayload.connectorId, 'Charging');
 421           const configuredMeterValueSampleInterval = this._configuration.configurationKey.find((value) => value.key === 'MeterValueSampleInterval');
 422           this.startMeterValues(requestPayload.connectorId,
 423               (configuredMeterValueSampleInterval ? configuredMeterValueSampleInterval.value * 1000 : 60000),
 424               this);
 425         }
 426       }
 427     } else {
 428       logger.error(this._basicFormatLog() + ' Starting transaction id ' + payload.transactionId + ' REJECTED with status ' + payload.idTagInfo.status + ', idTag ' + requestPayload.idTag);
 429       for (const connector in this._connectors) {
 430         if (Utils.convertToInt(connector) === Utils.convertToInt(requestPayload.connectorId)) {
 431           this._resetTransactionOnConnector(connector);
 432         }
 433       }
 434       this.sendStatusNotification(requestPayload.connectorId, 'Available');
 435     }
 436   }
 437
 438   async sendStatusNotification(connectorId, status, errorCode = 'NoError') {
 439     try {
 440       const payload = {
 441         connectorId,
 442         errorCode,
 443         status,
 444       };
 445       await this.sendMessage(uuid(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StatusNotification');
 446     } catch (error) {
 447       logger.error(this._basicFormatLog() + ' Send status error: ' + error);
 448     }
 449   }
 450
 451   // eslint-disable-next-line class-methods-use-this
 452   async _startHeartbeat(self) {
 453     if (self._heartbeatInterval && !self._heartbeatSetInterval) {
 454       logger.info(self._basicFormatLog() + ' Heartbeat started every ' + self._heartbeatInterval + 'ms');
 455       self._heartbeatSetInterval = setInterval(() => {
 456         try {
 457           const payload = {
 458             currentTime: new Date().toISOString(),
 459           };
 460           self.sendMessage(uuid(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'Heartbeat');
 461         } catch (error) {
 462           logger.error(self._basicFormatLog() + ' Send heartbeat error: ' + error);
 463         }
 464       }, self._heartbeatInterval);
 465     } else {
 466       logger.error(self._basicFormatLog() + ' Heartbeat interval undefined, not starting the heartbeat');
 467     }
 468   }
 469
 470   async handleRequest(messageId, commandName, commandPayload) {
 471     let result;
 472     this._statistics.addMessage(commandName, true);
 473     // Call
 474     if (typeof this['handle' + commandName] === 'function') {
 475       try {
 476         // Call the method
 477         result = await this['handle' + commandName](commandPayload);
 478       } catch (error) {
 479         // Log
 480         logger.error(this._basicFormatLog() + ' Handle request error: ' + error);
 481         // Send back response to inform back end
 482         await this.sendError(messageId, error);
 483       }
 484     } else {
 485       // Throw exception
 486       await this.sendError(messageId, new OCPPError(Constants.OCPP_ERROR_NOT_IMPLEMENTED, 'Not implemented', {}));
 487       throw new Error(`${commandName} is not implemented ${JSON.stringify(commandPayload, null, ' ')}`);
 488     }
 489     // Send response
 490     await this.sendMessage(messageId, result, Constants.OCPP_JSON_CALL_RESULT_MESSAGE);
 491   }
 492
 493   async handleGetConfiguration() {
 494     return this._configuration;
 495   }
 496
 497   async handleChangeConfiguration(commandPayload) {
 498     const keyToChange = this._configuration.configurationKey.find((element) => element.key === commandPayload.key);
 499     if (keyToChange && !Utils.convertToBoolean(keyToChange.readonly)) {
 500       const keyIndex = this._configuration.configurationKey.indexOf(keyToChange);
 501       this._configuration.configurationKey[keyIndex].value = commandPayload.value;
 502       return Constants.OCPP_RESPONSE_ACCEPTED;
 503     }
 504     return Constants.OCPP_RESPONSE_REJECTED;
 505   }
 506
 507   async handleRemoteStartTransaction(commandPayload) {
 508     const transactionConnectorID = (commandPayload.connectorId ? commandPayload.connectorId : '1');
 509     if (this.hasAuthorizationKeys() && this._getLocalAuthListEnabled() && this._getAuthorizeRemoteTxRequests()) {
 510       // Check if authorized
 511       if (this._authorizedKeys.find((value) => value === commandPayload.idTag)) {
 512         // Authorization successful start transaction
 513         setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), 500);
 514         logger.info(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' with idTag ' + commandPayload.idTag);
 515         return Constants.OCPP_RESPONSE_ACCEPTED;
 516       }
 517       // Start authorization checks
 518       logger.error(this._basicFormatLog() + ' Remote starting transaction REJECTED with status ' + commandPayload.idTagInfo.status + ', idTag ' + commandPayload.idTag);
 519       return Constants.OCPP_RESPONSE_REJECTED;
 520     }
 521     // No local authorization check required => start transaction
 522     setTimeout(() => this.sendStartTransaction(transactionConnectorID, commandPayload.idTag), 500);
 523     logger.info(this._basicFormatLog() + ' Transaction remotely STARTED on ' + this._stationInfo.name + '#' + transactionConnectorID + ' with idTag ' + commandPayload.idTag);
 524     return Constants.OCPP_RESPONSE_ACCEPTED;
 525   }
 526
 527   async sendStartTransaction(connectorID, idTag) {
 528     try {
 529       const payload = {
 530         connectorId: connectorID,
 531         idTag,
 532         meterStart: 0,
 533         timestamp: new Date().toISOString(),
 534       };
 535       return await this.sendMessage(uuid(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StartTransaction');
 536     } catch (error) {
 537       logger.error(this._basicFormatLog() + ' Send start transaction error: ' + error);
 538       this._resetTransactionOnConnector(connectorID);
 539       throw error;
 540     }
 541   }
 542
 543   async sendStopTransaction(transactionId, connectorID) {
 544     try {
 545       const payload = {
 546         transactionId,
 547         meterStop: 0,
 548         timestamp: new Date().toISOString(),
 549       };
 550       await this.sendMessage(uuid(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'StopTransaction');
 551       logger.info(this._basicFormatLog() + ' Transaction ' + this._connectors[connectorID].transactionId + ' STOPPED on ' + this._stationInfo.name + '#' + connectorID);
 552       this.sendStatusNotification(connectorID, 'Available');
 553     } catch (error) {
 554       logger.error(this._basicFormatLog() + ' Send stop transaction error: ' + error);
 555       throw error;
 556     } finally {
 557       this._resetTransactionOnConnector(connectorID);
 558     }
 559   }
 560
 561   _resetTransactionOnConnector(connectorID) {
 562     this._connectors[connectorID].transactionStarted = false;
 563     this._connectors[connectorID].transactionId = null;
 564     this._connectors[connectorID].lastConsumptionValue = -1;
 565     this._connectors[connectorID].lastSoC = -1;
 566     if (this._connectors[connectorID].transactionInterval) {
 567       clearInterval(this._connectors[connectorID].transactionInterval);
 568     }
 569   }
 570
 571   // eslint-disable-next-line class-methods-use-this
 572   async sendMeterValues(connectorID, interval, self) {
 573     try {
 574       const sampledValueLcl = {
 575         timestamp: new Date().toISOString(),
 576       };
 577       const meterValuesClone = JSON.parse(JSON.stringify(self._getConnector(connectorID).MeterValues));
 578       if (Array.isArray(meterValuesClone)) {
 579         sampledValueLcl.sampledValue = meterValuesClone;
 580       } else {
 581         sampledValueLcl.sampledValue = [meterValuesClone];
 582       }
 583       for (let index = 0; index < sampledValueLcl.sampledValue.length; index++) {
 584         if (sampledValueLcl.sampledValue[index].measurand && sampledValueLcl.sampledValue[index].measurand === 'SoC') {
 585           sampledValueLcl.sampledValue[index].value = Math.floor(Math.random() * 100) + 1;
 586           if (sampledValueLcl.sampledValue[index].value > 100) {
 587             logger.info(self._basicFormatLog() + ' Meter type: ' +
 588               (sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'default') +
 589               ' value: ' + sampledValueLcl.sampledValue[index].value);
 590           }
 591         } else {
 592           // Persist previous value in connector
 593           const connector = self._connectors[connectorID];
 594           let consumption;
 595           consumption = Utils.getRandomInt(self._stationInfo.maxPower / 3600000 * interval, 4);
 596           if (connector && connector.lastConsumptionValue >= 0) {
 597             connector.lastConsumptionValue += consumption;
 598           } else {
 599             connector.lastConsumptionValue = 0;
 600           }
 601           consumption = Math.round(connector.lastConsumptionValue * 3600 / interval);
 602           logger.info(self._basicFormatLog() + ' ConnectorID ' + connectorID + ' transaction ' + connector.transactionId + ' value ' + connector.lastConsumptionValue);
 603           sampledValueLcl.sampledValue[index].value = connector.lastConsumptionValue;
 604           if (sampledValueLcl.sampledValue[index].value > (self._stationInfo.maxPower * 3600 / interval) || sampledValueLcl.sampledValue[index].value < 500) {
 605             logger.info(self._basicFormatLog() + ' Meter type: ' +
 606               (sampledValueLcl.sampledValue[index].measurand ? sampledValueLcl.sampledValue[index].measurand : 'default') +
 607               ' value: ' + sampledValueLcl.sampledValue[index].value + '/' + (self._stationInfo.maxPower * 3600 / interval));
 608           }
 609         }
 610       }
 611
 612       const payload = {
 613         connectorId: connectorID,
 614         transactionId: self._connectors[connectorID].transactionId,
 615         meterValue: [sampledValueLcl],
 616       };
 617       await self.sendMessage(uuid(), payload, Constants.OCPP_JSON_CALL_MESSAGE, 'MeterValues');
 618     } catch (error) {
 619       logger.error(self._basicFormatLog() + ' Send meter values error: ' + error);
 620     }
 621   }
 622
 623   async startMeterValues(connectorID, interval, self) {
 624     if (!this._connectors[connectorID].transactionStarted) {
 625       logger.debug(`${self._basicFormatLog()} Trying to start meter values on connector ID ${connectorID} with no transaction`);
 626     } else if (this._connectors[connectorID].transactionStarted && !this._connectors[connectorID].transactionId) {
 627       logger.debug(`${self._basicFormatLog()} Trying to start meter values on connector ID ${connectorID} with no transaction id`);
 628     }
 629     this._connectors[connectorID].transactionInterval = setInterval(async () => {
 630       const sendMeterValues = performance.timerify(this.sendMeterValues);
 631       this._performanceObserver.observe({
 632         entryTypes: ['function'],
 633       });
 634       await sendMeterValues(connectorID, interval, self);
 635     }, interval);
 636   }
 637
 638   async handleRemoteStopTransaction(commandPayload) {
 639     for (const connector in this._connectors) {
 640       if (this._connectors[connector].transactionId === commandPayload.transactionId) {
 641         this.sendStopTransaction(commandPayload.transactionId, connector);
 642       }
 643     }
 644     return Constants.OCPP_RESPONSE_ACCEPTED;
 645   }
 646
 647   hasAuthorizationKeys() {
 648     return this._authorizedKeys && this._authorizedKeys.length > 0;
 649   }
 650
 651   getRandomTagId() {
 652     const index = Math.round(Math.floor(Math.random() * this._authorizedKeys.length - 1));
 653     return this._authorizedKeys[index];
 654   }
 655
 656   _getConnector(number) {
 657     return this._stationInfo.Connectors[number];
 658   }
 659 }
 660
 661 module.exports = ChargingStation;