+ private async internalSendMessage(
+ chargingStation: ChargingStation,
+ messageId: string,
+ messagePayload: JsonType | OCPPError,
+ messageType: MessageType,
+ commandName: RequestCommand | IncomingRequestCommand,
+ params: RequestParams = {
+ skipBufferingOnError: false,
+ triggerMessage: false,
+ }
+ ): Promise<ResponseType> {
+ if (
+ (chargingStation.isInUnknownState() === true &&
+ commandName === RequestCommand.BOOT_NOTIFICATION) ||
+ (chargingStation.getOcppStrictCompliance() === false &&
+ chargingStation.isInUnknownState() === true) ||
+ chargingStation.isInAcceptedState() === true ||
+ (chargingStation.isInPendingState() === true &&
+ (params.triggerMessage === true || messageType === MessageType.CALL_RESULT_MESSAGE))
+ ) {
+ // eslint-disable-next-line @typescript-eslint/no-this-alias
+ const self = this;
+ // Send a message through wsConnection
+ return Utils.promiseWithTimeout(
+ new Promise((resolve, reject) => {
+ /**
+ * Function that will receive the request's response
+ *
+ * @param payload -
+ * @param requestPayload -
+ */
+ const responseCallback = (payload: JsonType, requestPayload: JsonType): void => {
+ if (chargingStation.getEnableStatistics() === true) {
+ chargingStation.performanceStatistics?.addRequestStatistic(
+ commandName,
+ MessageType.CALL_RESULT_MESSAGE
+ );
+ }
+ // Handle the request's response
+ self.ocppResponseService
+ .responseHandler(
+ chargingStation,
+ commandName as RequestCommand,
+ payload,
+ requestPayload
+ )
+ .then(() => {
+ resolve(payload);
+ })
+ .catch((error) => {
+ reject(error);
+ })
+ .finally(() => {
+ chargingStation.requests.delete(messageId);
+ });
+ };
+
+ /**
+ * Function that will receive the request's error response
+ *
+ * @param error -
+ * @param requestStatistic -
+ */
+ const errorCallback = (error: OCPPError, requestStatistic = true): void => {
+ if (requestStatistic === true && chargingStation.getEnableStatistics() === true) {
+ chargingStation.performanceStatistics?.addRequestStatistic(
+ commandName,
+ MessageType.CALL_ERROR_MESSAGE
+ );
+ }
+ logger.error(
+ `${chargingStation.logPrefix()} Error occurred at ${OCPPServiceUtils.getMessageTypeString(
+ messageType
+ )} command ${commandName} with PDU %j:`,
+ messagePayload,
+ error
+ );
+ chargingStation.requests.delete(messageId);
+ reject(error);
+ };
+
+ if (chargingStation.getEnableStatistics() === true) {
+ chargingStation.performanceStatistics?.addRequestStatistic(commandName, messageType);
+ }
+ const messageToSend = this.buildMessageToSend(
+ chargingStation,
+ messageId,
+ messagePayload,
+ messageType,
+ commandName,
+ responseCallback,
+ errorCallback
+ );
+ let sendError = false;
+ // Check if wsConnection opened
+ const wsOpened = chargingStation.isWebSocketConnectionOpened() === true;
+ if (wsOpened) {
+ const beginId = PerformanceStatistics.beginMeasure(commandName);
+ try {
+ chargingStation.wsConnection?.send(messageToSend);
+ logger.debug(
+ `${chargingStation.logPrefix()} >> Command '${commandName}' sent ${OCPPServiceUtils.getMessageTypeString(
+ messageType
+ )} payload: ${messageToSend}`
+ );
+ } catch (error) {
+ logger.error(
+ `${chargingStation.logPrefix()} >> Command '${commandName}' failed to send ${OCPPServiceUtils.getMessageTypeString(
+ messageType
+ )} payload: ${messageToSend}:`,
+ error
+ );
+ sendError = true;
+ }
+ PerformanceStatistics.endMeasure(commandName, beginId);
+ }
+ const wsClosedOrErrored = !wsOpened || sendError === true;
+ if (wsClosedOrErrored && params.skipBufferingOnError === false) {
+ // Buffer
+ chargingStation.bufferMessage(messageToSend);
+ // Reject and keep request in the cache
+ return reject(
+ new OCPPError(
+ ErrorType.GENERIC_ERROR,
+ `WebSocket closed or errored for buffered message id '${messageId}' with content '${messageToSend}'`,
+ commandName,
+ (messagePayload as JsonObject)?.details ?? Constants.EMPTY_FREEZED_OBJECT
+ )
+ );
+ } else if (wsClosedOrErrored) {
+ const ocppError = new OCPPError(
+ ErrorType.GENERIC_ERROR,
+ `WebSocket closed or errored for non buffered message id '${messageId}' with content '${messageToSend}'`,
+ commandName,
+ (messagePayload as JsonObject)?.details ?? Constants.EMPTY_FREEZED_OBJECT
+ );
+ // Reject response
+ if (messageType !== MessageType.CALL_MESSAGE) {
+ return reject(ocppError);
+ }
+ // Reject and remove request from the cache
+ return errorCallback(ocppError, false);
+ }
+ // Resolve response
+ if (messageType !== MessageType.CALL_MESSAGE) {
+ return resolve(messagePayload);
+ }
+ }),
+ OCPPConstants.OCPP_WEBSOCKET_TIMEOUT,
+ new OCPPError(
+ ErrorType.GENERIC_ERROR,
+ `Timeout for message id '${messageId}'`,
+ commandName,
+ (messagePayload as JsonObject)?.details ?? Constants.EMPTY_FREEZED_OBJECT
+ ),
+ () => {
+ messageType === MessageType.CALL_MESSAGE && chargingStation.requests.delete(messageId);
+ }
+ );
+ }
+ throw new OCPPError(
+ ErrorType.SECURITY_ERROR,
+ `Cannot send command ${commandName} PDU when the charging station is in ${chargingStation.getRegistrationStatus()} state on the central server`,
+ commandName
+ );
+ }
+
+ private buildMessageToSend(
+ chargingStation: ChargingStation,
+ messageId: string,
+ messagePayload: JsonType | OCPPError,
+ messageType: MessageType,
+ commandName: RequestCommand | IncomingRequestCommand,
+ responseCallback: ResponseCallback,
+ errorCallback: ErrorCallback
+ ): string {