# State machine for the car # # #------------------------------------------------------------ import pyPlcTcpSocket import time # for time.sleep() from datetime import datetime from helpers import prettyHexMessage, compactHexMessage, combineValueAndMultiplier from mytestsuite import * from exiConnector import * # for EXI data handling/converting import json from configmodule import getConfigValue, getConfigValueBool stateNotYetInitialized = 0 stateConnecting = 1 stateConnected = 2 stateWaitForSupportedApplicationProtocolResponse = 3 stateWaitForSessionSetupResponse = 4 stateWaitForServiceDiscoveryResponse = 5 stateWaitForServicePaymentSelectionResponse = 6 stateWaitForContractAuthenticationResponse = 7 stateWaitForChargeParameterDiscoveryResponse = 8 stateWaitForConnectorLock = 9 stateWaitForCableCheckResponse = 10 stateWaitForPreChargeResponse = 11 stateWaitForContactorsClosed = 12 stateWaitForPowerDeliveryResponse = 13 stateWaitForCurrentDemandResponse = 14 stateWaitForWeldingDetectionResponse = 15 stateWaitForSessionStopResponse = 16 stateChargingFinished = 17 stateUnrecoverableError = 88 stateSequenceTimeout = 99 stateSafeShutDownWaitForChargerShutdown = 111 stateSafeShutDownWaitForContactorsOpen = 222 stateEnd = 1000 dinEVSEProcessingType_Finished = "0" dinEVSEProcessingType_Ongoing = "1" class fsmPev(): def addToTrace(self, s): self.callbackAddToTrace("[PEV] " + s) def publishStatus(self, s, strAuxInfo1="", strAuxInfo2=""): self.callbackShowStatus(s, "pevState", strAuxInfo1, strAuxInfo2) def exiDecode(self, exidata, schema): self.connMgr.ApplOk() s = compactHexMessage(exidata) strDateTime=datetime.today().strftime('%Y-%m-%dT%H:%M:%S.%f') self.exiLogFile.write(strDateTime + "=" + schema + " " + s +"\n") # write the EXI data to the exiLogFile return exiDecode(exidata, schema) # call the decoder def exiEncode(self, input): schema = input[0:2] exidata = exiEncode(input) # call the encoder s = exidata # it is already a hex string strDateTime=datetime.today().strftime('%Y-%m-%dT%H:%M:%S.%f') self.exiLogFile.write(strDateTime + "=" + schema + " " + s +"\n") # write the EXI data to the exiLogFile return exidata def prettifyState(self, statenumber): s="unknownState" if (statenumber == stateNotYetInitialized): s = "NotYetInitialized" if (statenumber == stateConnecting): s = "Connecting" if (statenumber == stateConnected): s = "Connected" if (statenumber == stateWaitForSupportedApplicationProtocolResponse): s = "WaitForSupportedApplicationProtocolResponse" if (statenumber == stateWaitForSessionSetupResponse): s = "WaitForSessionSetupResponse" if (statenumber == stateWaitForServiceDiscoveryResponse): s = "WaitForServiceDiscoveryResponse" if (statenumber == stateWaitForServicePaymentSelectionResponse): s = "WaitForServicePaymentSelectionResponse" if (statenumber == stateWaitForContractAuthenticationResponse): s = "WaitForContractAuthenticationResponse" if (statenumber == stateWaitForChargeParameterDiscoveryResponse): s = "WaitForChargeParameterDiscoveryResponse" if (statenumber == stateWaitForConnectorLock): s = "WaitForConnectorLock" if (statenumber == stateWaitForCableCheckResponse): s = "WaitForCableCheckResponse" if (statenumber == stateWaitForPreChargeResponse): s = "WaitForPreChargeResponse" if (statenumber == stateWaitForContactorsClosed): s = "WaitForContactorsClosed" if (statenumber == stateWaitForPowerDeliveryResponse): s = "WaitForPowerDeliveryResponse" if (statenumber == stateWaitForCurrentDemandResponse): s = "WaitForCurrentDemandResponse" if (statenumber == stateWaitForWeldingDetectionResponse): s = "WaitForWeldingDetectionResponse" if (statenumber == stateWaitForSessionStopResponse): s = "WaitForSessionStopResponse" if (statenumber == stateChargingFinished): s = "ChargingFinished" if (statenumber == stateUnrecoverableError): s = "UnrecoverableError" if (statenumber == stateSequenceTimeout): s = "SequenceTimeout" if (statenumber == stateSafeShutDownWaitForChargerShutdown): s = "SafeShutDownWaitForChargerShutdown" if (statenumber == stateSafeShutDownWaitForContactorsOpen): s = "SafeShutDownWaitForContactorsOpen" if (statenumber == stateEnd): s = "End" return s def isErrorEvseStatusCode(self, strEvseStatusCode): # 0 is EVSE_NotReady. This may be normal, no error, just wait. # 1 is EVSE_Ready: The normal case. if (strEvseStatusCode == "2"): # EVSE_Shutdown: The user stopped the charging normally on charger. self.addToTrace("EVSE_Shutdown. Seems the user canceled the charging on the charger.") self.publishStatus("EVSE_Shutdown") return True if (strEvseStatusCode == "3"): # EVSE_UtilityInterruptEvent: Stopped or power reduction self.addToTrace("EVSE_UtilityInterruptEvent.") self.publishStatus("EVSE_UtilityInterruptEvent") return True # 4 is EVSE_IsolationMonitoringActive. This is normal, no error. if (strEvseStatusCode == "5"): # EVSE_EmergencyShutdown: Error or Notaus button self.addToTrace("EVSE_EmergencyShutdown.") self.publishStatus("EVSE_EmergencyShutdown") return True if (strEvseStatusCode == "6"): # EVSE_Malfunction: Error self.addToTrace("EVSE_Malfunction.") self.publishStatus("EVSE_Malfunction") return True if (strEvseStatusCode == "7"): # Reserved, Error return True if (strEvseStatusCode == "8"): # Reserved, Error return True if (strEvseStatusCode == "9"): # Reserved, Error return True if (strEvseStatusCode == "10"): # Reserved, Error return True if (strEvseStatusCode == "11"): # Reserved, Error return True return False # no critical error detected def sendChargeParameterDiscoveryReq(self): soc = str(self.hardwareInterface.getSoc()) msg = addV2GTPHeader(self.exiEncode("EDE_"+self.sessionId + "_" + soc)) # EDE for Encode, Din, ChargeParameterDiscovery. self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) def sendCableCheckReq(self): soc = str(self.hardwareInterface.getSoc()) msg = addV2GTPHeader(self.exiEncode("EDF_"+self.sessionId + "_" + soc)) # EDF for Encode, Din, CableCheckReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) # Since the response to the CableCheckRequest may need longer, inform the connection manager to be patient. # This makes sure, that the timeout of the state machine comes before the timeout of the connectionManager, so # that we enter the safe shutdown sequence as intended. self.connMgr.ApplOk(31) def sendCurrentDemandReq(self): soc = str(self.hardwareInterface.getSoc()) EVTargetCurrent = str(self.hardwareInterface.getAccuMaxCurrent()) EVTargetVoltage = str(self.hardwareInterface.getAccuMaxVoltage()) msg = addV2GTPHeader(self.exiEncode("EDI_"+self.sessionId + "_" + soc + "_" + EVTargetCurrent + "_" + EVTargetVoltage )) # EDI for Encode, Din, CurrentDemandReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) def sendWeldingDetectionReq(self): soc = str(self.hardwareInterface.getSoc()) msg = addV2GTPHeader(self.exiEncode("EDJ_"+self.sessionId + "_" + soc)) # EDI for Encode, Din, WeldingDetectionReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) def enterState(self, n): self.addToTrace("from " + str(self.state) + ":" + self.prettifyState(self.state) + " entering " + str(n) + ":" + self.prettifyState(n)) self.state = n self.cyclesInState = 0 def isTooLong(self): # The timeout handling function. limit = 66 # number of call cycles until timeout. Default 66 cycles with 30ms, means approx. 2 seconds. # This 2s is the specified timeout time for many messages, fitting to the # performance time of 1.5s. Exceptions see below. if (self.state==stateWaitForChargeParameterDiscoveryResponse): limit = 5*33 # On some charger models, the chargeParameterDiscovery needs more than a second. Wait at least 5s. if (self.state==stateWaitForCableCheckResponse): limit = 30*33 # CableCheck may need some time. Wait at least 30s. if (self.state==stateWaitForPreChargeResponse): limit = 30*33 # PreCharge may need some time. Wait at least 30s. if (self.state==stateWaitForPowerDeliveryResponse): limit = 6*33 # PowerDelivery may need some time. Wait at least 6s. On Compleo charger, observed more than 1s until response. # specified performance time is 4.5s (ISO) if (self.state==stateWaitForCurrentDemandResponse): limit = 5*33 # Test with 5s timeout. Just experimental. # The specified performance time is 25ms (ISO), the specified timeout 250ms. return (self.cyclesInState > limit) def stateFunctionNotYetInitialized(self): pass # nothing to do, just wait for external event for re-initialization def stateFunctionConnecting(self): if (self.cyclesInState<30): # The first second in the state just do nothing. return evseIp = self.addressManager.getSeccIp() # the chargers IP address which was announced in SDP seccTcpPort = self.addressManager.getSeccTcpPort() # the chargers TCP port which was announced in SDP self.addToTrace("Checkpoint301: connecting") self.Tcp.connect(evseIp, seccTcpPort) # This is a blocking call. If we come back, we are connected, or not. if (not self.Tcp.isConnected): # Bad case: Connection did not work. May happen if we are too fast and the charger needs more # time until the socket is ready. Or the charger is defective. Or somebody pulled the plug. # No matter what is the reason, we just try again and again. What else would make sense? self.addToTrace("Connection failed. Will try again.") self.reInit() # stay in same state, reset the cyclesInState and try again return else: # Good case: We are connected. Change to the next state. self.addToTrace("connected") self.publishStatus("TCP connected") self.isUserStopRequest = False self.enterState(stateConnected) return def stateFunctionConnected(self): # We have a freshly established TCP channel. We start the V2GTP/EXI communication now. # We just use the initial request message from the Ioniq. It contains one entry: DIN. self.addToTrace("Checkpoint400: Sending the initial SupportedApplicationProtocolReq") self.Tcp.transmit(addV2GTPHeader(exiHexToByteArray(exiHexDemoSupportedApplicationProtocolRequestIoniq))) self.hardwareInterface.resetSimulation() self.enterState(stateWaitForSupportedApplicationProtocolResponse) def stateFunctionWaitForSupportedApplicationProtocolResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForSupportedApplicationProtocolResponse, received " + prettyHexMessage(self.rxData)) if ((self.rxData[0]!=0x01) or (self.rxData[1]!=0xFE)): # it is no EXI data. Print it to log, it could be a TESTSUITE notification. self.addToTrace("TESTSUITE notification. Seems we are running a test case. TTTTTTTTTTTTTTTTTTTTTTT") if (len(self.rxData)<=20): # it was the length of the testsuite notification. We are finished with this message. self.rxData = [] return else: # There was more data than the 20 byte testsuite notification. Most likely the EXI comes in the same message. self.rxData = self.rxData[20:] exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "Dh") # Decode Handshake-response self.addToTrace(strConverterResult) if (strConverterResult.find("supportedAppProtocolRes")>0): # todo: check the request content, and fill response parameters self.publishStatus("Schema negotiated") self.addToTrace("Checkpoint403: Schema negotiated. And Checkpoint500: Will send SessionSetupReq") self.addToTrace("EDA_"+self.evccid) msg = addV2GTPHeader(self.exiEncode("EDA_"+self.evccid)) # EDA for Encode, Din, SessionSetupReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForSessionSetupResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForSessionSetupResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForSessionSetupResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("SessionSetupRes")>0): # todo: check the request content, and fill response parameters strResponseCode = "na" try: y = json.loads(strConverterResult) strSessionId = y["header.SessionID"] strResponseCode = y["ResponseCode"] self.addToTrace("Checkpoint506: The Evse decided for SessionId " + strSessionId) self.publishStatus("Session established") self.sessionId = strSessionId except: self.addToTrace("ERROR: Could not decode the sessionID") if (strResponseCode!="OK_NewSessionEstablished"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return self.addToTrace("Will send ServiceDiscoveryReq") msg = addV2GTPHeader(self.exiEncode("EDB_"+self.sessionId)) # EDB for Encode, Din, ServiceDiscoveryRequest self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForServiceDiscoveryResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForServiceDiscoveryResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForServiceDiscoveryResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("ServiceDiscoveryRes")>0): strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] except: self.addToTrace("ERROR: Could not decode the ServiceDiscoveryResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return self.publishStatus("ServDisc done") self.addToTrace("Will send ServicePaymentSelectionReq") msg = addV2GTPHeader(self.exiEncode("EDC_"+self.sessionId)) # EDC for Encode, Din, ServicePaymentSelection self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForServicePaymentSelectionResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForServicePaymentSelectionResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForServicePaymentSelectionResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("ServicePaymentSelectionRes")>0): # todo: check the request content, and fill response parameters strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] except: self.addToTrace("ERROR: Could not decode the ServicePaymentSelectionResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return self.publishStatus("ServPaySel done") self.addToTrace("Checkpoint530: Will send ContractAuthenticationReq") msg = addV2GTPHeader(self.exiEncode("EDL_"+self.sessionId)) # EDL for Encode, Din, ContractAuthenticationReq. self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.numberOfContractAuthenticationReq = 1 # This is the first request. self.enterState(stateWaitForContractAuthenticationResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForContractAuthenticationResponse(self): if (self.cyclesInState<30): # The first second in the state just do nothing. return if (len(self.rxData)>0): self.addToTrace("In state WaitForContractAuthentication, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("ContractAuthenticationRes")>0): # In normal case, we can have two results here: either the Authentication is needed (the user # needs to authorize by RFID card or app, or something like this. # Or, the authorization is finished. This is shown by EVSEProcessing=Finished. strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] except: self.addToTrace("ERROR: Could not decode the ContractAuthenticationResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return if (strConverterResult.find('"EVSEProcessing": "Finished"')>0): self.publishStatus("Auth finished") self.addToTrace("Checkpoint538: Auth is Finished. Will send ChargeParameterDiscoveryReq") self.sendChargeParameterDiscoveryReq() self.numberOfChargeParameterDiscoveryReq = 1 # first message self.enterState(stateWaitForChargeParameterDiscoveryResponse) else: # Not (yet) finished. if (self.numberOfContractAuthenticationReq>=120): # approx 120 seconds, maybe the user searches two minutes for his RFID card... self.addToTrace("Authentication lasted too long. " + str(self.numberOfContractAuthenticationReq) + " Giving up.") self.enterState(stateSequenceTimeout) else: # Try again. self.numberOfContractAuthenticationReq += 1 # count the number of tries. self.publishStatus("Waiting f Auth") self.addToTrace("Not (yet) finished. Will again send ContractAuthenticationReq #" + str(self.numberOfContractAuthenticationReq)) msg = addV2GTPHeader(self.exiEncode("EDL_"+self.sessionId)) # EDL for Encode, Din, ContractAuthenticationReq. self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) # We just stay in the same state, until the timeout elapses. self.enterState(stateWaitForContractAuthenticationResponse) if (self.isTooLong()): # The timeout in case if nothing is received at all. self.enterState(stateSequenceTimeout) def stateFunctionWaitForChargeParameterDiscoveryResponse(self): if (self.cyclesInState<30): # The first second in the state just do nothing. return if (len(self.rxData)>0): self.addToTrace("In state WaitForChargeParameterDiscoveryResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("ChargeParameterDiscoveryRes")>0): strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] except: self.addToTrace("ERROR: Could not decode the ChargeParameterDiscoveryResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return # We can have two cases here: # (A) The charger needs more time to show the charge parameters. # (B) The charger finished to tell the charge parameters. if (strConverterResult.find('"EVSEProcessing": "Finished"')>0): self.publishStatus("ChargeParams discovered") self.addToTrace("Checkpoint550: ChargeParams are discovered. Will change to state C.") #Report charger paramters self.hardwareInterface.setChargerParameters(500, 50) #TODO: send real parameters # pull the CP line to state C here: self.hardwareInterface.setStateC() self.addToTrace("Checkpoint555: Locking the connector.") self.hardwareInterface.triggerConnectorLocking() self.enterState(stateWaitForConnectorLock) else: # Not (yet) finished. if (self.numberOfChargeParameterDiscoveryReq>=60): # approx 60 seconds, should be sufficient for the charger to find its parameters... The ISO allows up to 55s reaction time and 60s timeout for "ongoing". self.addToTrace("ChargeParameterDiscovery lasted too long. " + str(self.numberOfChargeParameterDiscoveryReq) + " Giving up.") self.enterState(stateSequenceTimeout) else: # Try again. self.numberOfChargeParameterDiscoveryReq += 1 # count the number of tries. self.publishStatus("disc ChargeParams") self.addToTrace("Not (yet) finished. Will again send ChargeParameterDiscoveryReq #" + str(self.numberOfChargeParameterDiscoveryReq)) self.sendChargeParameterDiscoveryReq() # we stay in the same state self.enterState(stateWaitForChargeParameterDiscoveryResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForConnectorLock(self): if (self.hardwareInterface.isConnectorLocked()): self.addToTrace("Checkpoint560: Connector Lock confirmed. Will send CableCheckReq.") self.sendCableCheckReq() self.numberOfCableCheckReq = 1 # This is the first request. self.enterState(stateWaitForCableCheckResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForCableCheckResponse(self): if (self.cyclesInState<30): # The first second in the state just do nothing. return if (len(self.rxData)>0): self.addToTrace("In state WaitForCableCheckResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("CableCheckRes")>0): strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] strEVSEProcessing = y["EVSEProcessing"] self.addToTrace("The CableCheck result is " + strResponseCode + " " + strEVSEProcessing) except: self.addToTrace("ERROR: Could not decode the CableCheckRes") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return # We have two cases here: # 1) The charger says "cable check is finished and cable ok", by setting ResponseCode=OK and EVSEProcessing=Finished. # 2) Else: The charger says "need more time or cable not ok". In this case, we just run into timeout and start from the beginning. if ((strEVSEProcessing=="Finished") and (strResponseCode=="OK")): self.publishStatus("CbleChck done") self.addToTrace("The EVSE says that the CableCheck is finished and ok.") self.addToTrace("Will send PreChargeReq") soc = self.hardwareInterface.getSoc() EVTargetVoltage = self.hardwareInterface.getAccuVoltage() msg = addV2GTPHeader(self.exiEncode("EDG_"+self.sessionId+"_"+str(soc)+"_"+str(EVTargetVoltage))) # EDG for Encode, Din, PreChargeReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.connMgr.ApplOk(31) # PreChargeResponse may need longer. Inform the connection manager to be patient. self.enterState(stateWaitForPreChargeResponse) else: if (self.numberOfCableCheckReq>60): # approx 60s should be sufficient for cable check. The ISO allows up to 55s reaction time and 60s timeout for "ongoing". self.addToTrace("CableCheck lasted too long. " + str(self.numberOfCableCheckReq) + " Giving up.") self.enterState(stateSequenceTimeout) else: # cable check not yet finished or finished with bad result -> try again self.numberOfCableCheckReq += 1 self.publishStatus("CbleChck ongoing", format(self.hardwareInterface.getInletVoltage(),".0f") + "V") self.addToTrace("Will again send CableCheckReq") self.sendCableCheckReq() # stay in the same state self.enterState(stateWaitForCableCheckResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForPreChargeResponse(self): self.hardwareInterface.simulatePreCharge() if (self.DelayCycles>0): self.DelayCycles-=1 return if (len(self.rxData)>0): self.addToTrace("In state WaitForPreChargeResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("PreChargeRes")>0): u = 0 # a default voltage of 0V in case we cannot convert the actual value strResponseCode = "na" strEVSEStatusCode = "0" # default in case the decoding does not work try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] strEVSEPresentVoltageValue = y["EVSEPresentVoltage.Value"] strEVSEPresentVoltageMultiplier = y["EVSEPresentVoltage.Multiplier"] u = combineValueAndMultiplier(strEVSEPresentVoltageValue, strEVSEPresentVoltageMultiplier) self.callbackShowStatus(format(u,".1f"), "EVSEPresentVoltage") strEVSEStatusCode = y["DC_EVSEStatus.EVSEStatusCode"] except: self.addToTrace("ERROR: Could not decode the PreChargeResponse") self.addToTrace("PreChargeResponse received.") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return if (self.isErrorEvseStatusCode(strEVSEStatusCode)): self.enterState(stateUnrecoverableError) return if (getConfigValueBool("use_evsepresentvoltage_for_precharge_end")): # We want to use the EVSEPresentVoltage, which was reported by the charger, as end-criteria for the precharging. s = "EVSEPresentVoltage " + str(u) + "V, " else: # We want to use the physically measured inlet voltage as end-criteria for the precharging. u = self.hardwareInterface.getInletVoltage() s = "U_Inlet " + str(u) + "V, " s= s + "U_Accu " + str(self.hardwareInterface.getAccuVoltage()) + "V" self.addToTrace(s) if (abs(u-self.hardwareInterface.getAccuVoltage()) < float(getConfigValue("u_delta_max_for_end_of_precharge"))): self.addToTrace("Difference between accu voltage and inlet voltage is small.") self.publishStatus("PreCharge done") if (self.isLightBulbDemo): # For light-bulb-demo, nothing to do here. self.addToTrace("This is a light bulb demo. Do not turn-on the relay at end of precharge.") else: # In real-world-case, turn the power relay on. self.addToTrace("Checkpoint590: Turning the contactors on.") self.hardwareInterface.setPowerRelayOn() self.DelayCycles = 10 # 10*33ms = 330ms waiting for contactors self.enterState(stateWaitForContactorsClosed) else: self.publishStatus("PreChrge ongoing", format(u, ".0f") + "V") self.addToTrace("Difference too big. Continuing PreCharge.") soc = self.hardwareInterface.getSoc() EVTargetVoltage = self.hardwareInterface.getAccuVoltage() msg = addV2GTPHeader(self.exiEncode("EDG_"+self.sessionId+"_"+str(soc)+"_"+str(EVTargetVoltage))) # EDG for Encode, Din, PreChargeReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.DelayCycles=15 # wait with the next evaluation approx half a second if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForContactorsClosed(self): if (self.DelayCycles>0): self.DelayCycles-=1 return if (self.isLightBulbDemo): readyForNextState=1 # if it's just a bulb demo, we do not wait for contactor, because it is not switched in this moment. else: readyForNextState = self.hardwareInterface.getPowerRelayConfirmation() # check if the contactor is closed if (readyForNextState): self.addToTrace("Contactors are confirmed to be closed.") self.publishStatus("Contactors ON") if (readyForNextState): self.addToTrace("Sending PowerDeliveryReq.") soc = self.hardwareInterface.getSoc() msg = addV2GTPHeader(self.exiEncode("EDH_"+self.sessionId+"_"+ str(soc) + "_" + "1")) # EDH for Encode, Din, PowerDeliveryReq, ON self.wasPowerDeliveryRequestedOn=True self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForPowerDeliveryResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForPowerDeliveryResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForPowerDeliveryRes, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("PowerDeliveryRes")>0): strResponseCode = "na" try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] except: self.addToTrace("ERROR: Could not decode the PowerDeliveryResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return if (self.wasPowerDeliveryRequestedOn): self.publishStatus("PwrDelvy ON success") self.addToTrace("Checkpoint700: Starting the charging loop with CurrentDemandReq") self.sendCurrentDemandReq() self.enterState(stateWaitForCurrentDemandResponse) else: # We requested "OFF". So we turn-off the Relay and continue with the Welding detection. self.publishStatus("PwrDelvry OFF success") self.addToTrace("Checkpoint806: PowerDelivery Off confirmed.") self.addToTrace("Checkpoint810: Changing CP line to State B.") # set the CP line to B self.hardwareInterface.setStateB() self.addToTrace("Turning off the relay and starting the WeldingDetection") self.hardwareInterface.setPowerRelayOff() self.hardwareInterface.setRelay2Off() self.isBulbOn = False self.sendWeldingDetectionReq() self.enterState(stateWaitForWeldingDetectionResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForCurrentDemandResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForCurrentDemandRes, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("CurrentDemandRes")>0): strResponseCode = "na" u = 0 # a default voltage of 0V in case we cannot convert the actual value strEVSEStatusCode = "0" # default in case the decoding does not work try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] strEVSEPresentVoltageValue = y["EVSEPresentVoltage.Value"] strEVSEPresentVoltageMultiplier = y["EVSEPresentVoltage.Multiplier"] u = combineValueAndMultiplier(strEVSEPresentVoltageValue, strEVSEPresentVoltageMultiplier) self.callbackShowStatus(format(u,".1f"), "EVSEPresentVoltage") strEVSEStatusCode = y["DC_EVSEStatus.EVSEStatusCode"] self.hardwareInterface.setChargerVoltageAndCurrent(u, EVTargetCurrent) #TODO: report real current! except: self.addToTrace("ERROR: Could not decode the PreChargeResponse") if (strResponseCode!="OK"): self.addToTrace("Wrong response code. Aborting.") self.enterState(stateUnrecoverableError) return if (self.isErrorEvseStatusCode(strEVSEStatusCode)): self.enterState(stateUnrecoverableError) return if (getConfigValueBool("use_physical_inlet_voltage_during_chargeloop")): # Instead of using the voltage which is reported by the charger, use the physically measured. u = self.hardwareInterface.getInletVoltage() # as long as the accu is not full and no stop-demand from the user, we continue charging if (self.hardwareInterface.getIsAccuFull() or self.isUserStopRequest): if (self.hardwareInterface.getIsAccuFull()): self.publishStatus("Accu full") self.addToTrace("Accu is full. Sending PowerDeliveryReq Stop.") else: self.publishStatus("User req stop") self.addToTrace("User requested stop. Sending PowerDeliveryReq Stop.") soc = self.hardwareInterface.getSoc() msg = addV2GTPHeader(self.exiEncode("EDH_"+self.sessionId+"_"+ str(soc) + "_" + "0")) # EDH for Encode, Din, PowerDeliveryReq, OFF self.wasPowerDeliveryRequestedOn=False self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForPowerDeliveryResponse) else: # continue charging loop self.publishStatus("Charging", format(u, ".0f") + "V", format(self.hardwareInterface.getSoc(), ".1f") + "%") self.sendCurrentDemandReq() self.enterState(stateWaitForCurrentDemandResponse) if (self.isLightBulbDemo): if (self.cyclesLightBulbDelay<=33*2): self.cyclesLightBulbDelay+=1 else: if (not self.isBulbOn): self.addToTrace("This is a light bulb demo. Turning-on the bulb when 2s in the main charging loop.") self.hardwareInterface.setPowerRelayOn() self.hardwareInterface.setRelay2On() self.isBulbOn = True if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForWeldingDetectionResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForWeldingDetectionResponse, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("WeldingDetectionRes")>0): strResponseCode = "na" # todo: add real welding detection here, run in welding detection loop until finished. self.publishStatus("WldingDet done") self.addToTrace("Sending SessionStopReq") msg = addV2GTPHeader(self.exiEncode("EDK_"+self.sessionId)) # EDI for Encode, Din, SessionStopReq self.addToTrace("responding " + prettyHexMessage(msg)) self.Tcp.transmit(msg) self.enterState(stateWaitForSessionStopResponse) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionWaitForSessionStopResponse(self): if (len(self.rxData)>0): self.addToTrace("In state WaitForSessionStopRes, received " + prettyHexMessage(self.rxData)) exidata = removeV2GTPHeader(self.rxData) self.rxData = [] strConverterResult = self.exiDecode(exidata, "DD") # Decode DIN self.addToTrace(strConverterResult) if (strConverterResult.find("SessionStopRes")>0): strResponseCode = "na" # req -508 # Unlocking of the connector in the next state. self.publishStatus("Stopped normally") self.addToTrace("Charging is finished") self.enterState(stateChargingFinished) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionChargingFinished(self): # charging is finished. # Finally unlock the connector self.addToTrace("Charging successfully finished. Unlocking the connector") self.hardwareInterface.triggerConnectorUnlocking() testsuite_reportstatus("TSRS_ChargingFinished") self.enterState(stateEnd) def stateFunctionSequenceTimeout(self): # Here we end, if we run into a timeout in the state machine. self.publishStatus("ERROR Timeout") # Initiate the safe-shutdown-sequence. self.addToTrace("Safe-shutdown-sequence: setting state B") self.hardwareInterface.setStateB() # setting CP line to B disables in the charger the current flow. self.DelayCycles = 66 # 66*30ms=2s for charger shutdown self.enterState(stateSafeShutDownWaitForChargerShutdown) def stateFunctionUnrecoverableError(self): # Here we end, if the EVSE reported an error code, which terminates the charging session. self.publishStatus("ERROR reported") # Initiate the safe-shutdown-sequence. self.addToTrace("Safe-shutdown-sequence: setting state B") self.hardwareInterface.setStateB() # setting CP line to B disables in the charger the current flow. self.DelayCycles = 66 # 66*30ms=2s for charger shutdown self.enterState(stateSafeShutDownWaitForChargerShutdown) def stateFunctionSafeShutDownWaitForChargerShutdown(self): # wait state, to give the charger the time to stop the current. self.connMgr.ApplOk() # Trigger the communication manager, so that it does not disturb our safe-shutdown. if (self.DelayCycles>0): self.DelayCycles-=1 return # Now the current flow is stopped by the charger. We can safely open the contactors: self.addToTrace("Safe-shutdown-sequence: opening contactors") self.hardwareInterface.setPowerRelayOff() self.hardwareInterface.setRelay2Off() self.DelayCycles = 33 # 33*30ms=1s for opening the contactors self.enterState(stateSafeShutDownWaitForContactorsOpen) def stateFunctionSafeShutDownWaitForContactorsOpen(self): # wait state, to give the contactors the time to open. self.connMgr.ApplOk() # Trigger the communication manager, so that it does not disturb our safe-shutdown. if (self.DelayCycles>0): self.DelayCycles-=1 return # Finally, when we have no current and no voltage, unlock the connector self.addToTrace("Safe-shutdown-sequence: unlocking the connector") self.hardwareInterface.triggerConnectorUnlocking() testsuite_reportstatus("TSRS_SafeShutdownFinished") # This is the end of the safe-shutdown-sequence. self.enterState(stateEnd) def stateFunctionEnd(self): # Just stay here, until we get re-initialized after a new SLAC/SDP. pass stateFunctions = { stateNotYetInitialized: stateFunctionNotYetInitialized, stateConnecting: stateFunctionConnecting, stateConnected: stateFunctionConnected, stateWaitForSupportedApplicationProtocolResponse: stateFunctionWaitForSupportedApplicationProtocolResponse, stateWaitForSessionSetupResponse: stateFunctionWaitForSessionSetupResponse, stateWaitForServiceDiscoveryResponse: stateFunctionWaitForServiceDiscoveryResponse, stateWaitForServicePaymentSelectionResponse: stateFunctionWaitForServicePaymentSelectionResponse, stateWaitForContractAuthenticationResponse: stateFunctionWaitForContractAuthenticationResponse, stateWaitForChargeParameterDiscoveryResponse: stateFunctionWaitForChargeParameterDiscoveryResponse, stateWaitForConnectorLock: stateFunctionWaitForConnectorLock, stateWaitForCableCheckResponse: stateFunctionWaitForCableCheckResponse, stateWaitForPreChargeResponse: stateFunctionWaitForPreChargeResponse, stateWaitForContactorsClosed: stateFunctionWaitForContactorsClosed, stateWaitForPowerDeliveryResponse: stateFunctionWaitForPowerDeliveryResponse, stateWaitForCurrentDemandResponse: stateFunctionWaitForCurrentDemandResponse, stateWaitForWeldingDetectionResponse: stateFunctionWaitForWeldingDetectionResponse, stateWaitForSessionStopResponse: stateFunctionWaitForSessionStopResponse, stateChargingFinished: stateFunctionChargingFinished, stateUnrecoverableError: stateFunctionUnrecoverableError, stateSequenceTimeout: stateFunctionSequenceTimeout, stateSafeShutDownWaitForChargerShutdown: stateFunctionSafeShutDownWaitForChargerShutdown, stateSafeShutDownWaitForContactorsOpen: stateFunctionSafeShutDownWaitForContactorsOpen, stateEnd: stateFunctionEnd } def stopCharging(self): # API function to stop the charging. self.isUserStopRequest = True def reInit(self): self.addToTrace("re-initializing fsmPev") self.Tcp.disconnect() self.hardwareInterface.setStateB() self.hardwareInterface.setPowerRelayOff() self.hardwareInterface.setRelay2Off() self.isBulbOn = False self.cyclesLightBulbDelay = 0 self.state = stateConnecting self.cyclesInState = 0 self.rxData = [] def __init__(self, addressManager, connMgr, callbackAddToTrace, hardwareInterface, callbackShowStatus): self.callbackAddToTrace = callbackAddToTrace self.callbackShowStatus = callbackShowStatus self.addToTrace("initializing fsmPev") self.exiLogFile = open('PevExiLog.txt', 'a') self.exiLogFile.write("init\n") self.Tcp = pyPlcTcpSocket.pyPlcTcpClientSocket(self.callbackAddToTrace) self.addressManager = addressManager self.connMgr = connMgr self.hardwareInterface = hardwareInterface self.state = stateNotYetInitialized self.sessionId = "DEAD55AADEAD55AA" self.evccid = addressManager.getLocalMacAsTwelfCharString() self.cyclesInState = 0 self.DelayCycles = 0 self.rxData = [] self.isLightBulbDemo = getConfigValueBool("light_bulb_demo") self.isBulbOn = False self.cyclesLightBulbDelay = 0 self.isUserStopRequest = False # we do NOT call the reInit, because we want to wait with the connection until external trigger comes def __del__(self): self.exiLogFile.write("closing\n") self.exiLogFile.close() def mainfunction(self): #self.Tcp.mainfunction() # call the lower-level worker if (self.Tcp.isRxDataAvailable()): self.rxData = self.Tcp.getRxData() #self.addToTrace("received " + prettyHexMessage(self.rxData)) # run the state machine: self.cyclesInState += 1 # for timeout handling, count how long we are in a state self.stateFunctions[self.state](self) if __name__ == "__main__": print("Testing the pev state machine") pev = fsmPev() print("Press Ctrl-Break for aborting") while (True): time.sleep(0.1) pev.mainfunction()