# State machine for the car # # #------------------------------------------------------------ import pyPlcTcpSocket import time # for time.sleep() from datetime import datetime from helpers import prettyHexMessage, compactHexMessage from exiConnector import * # for EXI data handling/converting import json PARAM_U_DELTA_MAX_FOR_END_OF_PRECHARGE = 10 # volts between inlet and accu, to change from PreCharge to PowerDelivery stateNotYetInitialized = 0 stateConnecting = 1 stateConnected = 2 stateWaitForSupportedApplicationProtocolResponse = 3 stateWaitForSessionSetupResponse = 4 stateWaitForServiceDiscoveryResponse = 5 stateWaitForServicePaymentSelectionResponse = 6 stateWaitForContractAuthenticationResponse = 7 stateWaitForChargeParameterDiscoveryResponse = 8 stateWaitForCableCheckResponse = 9 stateWaitForPreChargeResponse = 10 stateWaitForPowerDeliveryResponse = 11 stateWaitForCurrentDemandResponse = 12 stateWaitForWeldingDetectionResponse = 13 stateWaitForSessionStopResponse = 14 stateChargingFinished = 15 stateSequenceTimeout = 99 dinEVSEProcessingType_Finished = "0" dinEVSEProcessingType_Ongoing = "1" class fsmPev(): def addToTrace(self, s): self.callbackAddToTrace("[PEV] " + s) def publishStatus(self, s): self.callbackShowStatus(s, "pevState") def exiDecode(self, exidata, schema): 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 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) 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): print("from " + str(self.state) + " entering " + str(n)) self.state = n self.cyclesInState = 0 def isTooLong(self): # The timeout handling function. limit = 30 # number of call cycles until timeout if (self.state==stateWaitForCableCheckResponse): limit = 30*30 # CableCheck may need some time. Wait at least 30s. if (self.state==stateWaitForPreChargeResponse): limit = 30*30 # PreCharge may need some time. Wait at least 30s. 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.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("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)) 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("Will send SessionSetupReq") msg = addV2GTPHeader(self.exiEncode("EDA")) # 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 try: y = json.loads(strConverterResult) strSessionId = y["header.SessionID"] self.addToTrace("The Evse decided for SessionId " + strSessionId) self.publishStatus("Session established") self.sessionId = strSessionId except: self.addToTrace("ERROR: Could not decode the sessionID") 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): # todo: check the request content, and fill response parameters self.publishStatus("ServiceDiscovery finished") 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 self.publishStatus("ServicePaymentSelection finished") self.addToTrace("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. if (strConverterResult.find('"EVSEProcessing": "Finished"')>0): self.publishStatus("Authorization finished") self.addToTrace("It 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 for Authorization") 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): # 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("ChargeParameters discovered") self.addToTrace("It is Finished. Will change to state C and send CableCheckReq.") # pull the CP line to state C here: self.hardwareInterface.setStateC() self.sendCableCheckReq() self.numberOfCableCheckReq = 1 # This is the first request. self.enterState(stateWaitForCableCheckResponse) else: # Not (yet) finished. if (self.numberOfChargeParameterDiscoveryReq>=20): # approx 20 seconds, should be sufficient for the charger to find its parameters... 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("discovering ChargeParameters") 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 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): try: y = json.loads(strConverterResult) strResponseCode = y["ResponseCode"] strEVSEProcessing = y["EVSEProcessing"] self.addToTrace("[PEV] The CableCheck result is " + strResponseCode + " " + strEVSEProcessing) except: self.addToTrace("ERROR: Could not decode the CableCheckRes") # todo: check the request content, and fill response parameters # 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("CableCheck 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.enterState(stateWaitForPreChargeResponse) else: if (self.numberOfCableCheckReq>30): # approx 30s should be sufficient for cable check 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("CableCheck ongoing") 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): # todo: check the request content, and fill response parameters self.addToTrace("PreCharge aknowledge received.") s = "U_Inlet " + str(self.hardwareInterface.getInletVoltage()) + "V, " s= s + "U_Accu " + str(self.hardwareInterface.getAccuVoltage()) + "V" self.addToTrace(s) if (abs(self.hardwareInterface.getInletVoltage()-self.hardwareInterface.getAccuVoltage()) < PARAM_U_DELTA_MAX_FOR_END_OF_PRECHARGE): self.addToTrace("Difference between accu voltage and inlet voltage is small. Sending PowerDeliveryReq.") 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.hardwareInterface.setPowerRelayOn() 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) else: self.publishStatus("PreCharge ongoing") 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 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): if (self.wasPowerDeliveryRequestedOn): self.publishStatus("PowerDelivery ON success") self.addToTrace("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("PowerDelivery OFF success") 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): # 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 requested 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") self.sendCurrentDemandReq() self.enterState(stateWaitForCurrentDemandResponse) if (self.isLightBulbDemo): if (self.cyclesLightBulbDelay<=33*5): self.cyclesLightBulbDelay+=1 else: if (not self.isBulbOn): self.addToTrace("This is a light bulb demo. Turning-on the bulb when 5s 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): # todo: add real welding detection here, run in welding detection loop until finished. self.publishStatus("WeldingDetection 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): # req -508 # Todo: close the TCP connection here. # Todo: Unlock the connector lock. self.publishStatus("Session stopped normally") self.hardwareInterface.setStateB() self.addToTrace("Charging is finished") self.enterState(stateChargingFinished) if (self.isTooLong()): self.enterState(stateSequenceTimeout) def stateFunctionChargingFinished(self): # charging is finished. Nothing to do. Just stay here, until we get re-initialized after a new SLAC/SDP. pass def stateFunctionSequenceTimeout(self): # Here we end, if we run into a timeout in the state machine. This is an error case, and # we should re-initalize and try again to get a communication. # Todo: Maybe we want even inform the pyPlcHomeplug to do a new SLAC. # For the moment, we just re-establish the TCP connection. self.publishStatus("ERROR Timeout") self.reInit() stateFunctions = { stateNotYetInitialized: stateFunctionNotYetInitialized, stateConnecting: stateFunctionConnecting, stateConnected: stateFunctionConnected, stateWaitForSupportedApplicationProtocolResponse: stateFunctionWaitForSupportedApplicationProtocolResponse, stateWaitForSessionSetupResponse: stateFunctionWaitForSessionSetupResponse, stateWaitForServiceDiscoveryResponse: stateFunctionWaitForServiceDiscoveryResponse, stateWaitForServicePaymentSelectionResponse: stateFunctionWaitForServicePaymentSelectionResponse, stateWaitForContractAuthenticationResponse: stateFunctionWaitForContractAuthenticationResponse, stateWaitForChargeParameterDiscoveryResponse: stateFunctionWaitForChargeParameterDiscoveryResponse, stateWaitForCableCheckResponse: stateFunctionWaitForCableCheckResponse, stateWaitForPreChargeResponse: stateFunctionWaitForPreChargeResponse, stateWaitForPowerDeliveryResponse: stateFunctionWaitForPowerDeliveryResponse, stateWaitForCurrentDemandResponse: stateFunctionWaitForCurrentDemandResponse, stateWaitForWeldingDetectionResponse: stateFunctionWaitForWeldingDetectionResponse, stateWaitForSessionStopResponse: stateFunctionWaitForSessionStopResponse, stateChargingFinished: stateFunctionChargingFinished, stateSequenceTimeout: stateFunctionSequenceTimeout } 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, 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.hardwareInterface = hardwareInterface self.state = stateNotYetInitialized self.sessionId = "DEAD55AADEAD55AA" self.cyclesInState = 0 self.DelayCycles = 0 self.rxData = [] self.isLightBulbDemo = True 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()