Added MQTT backend and more usage of hardwareInterface in EVSE mode

doc/pyPlc.ini.template

@@ -44,6 +44,10 @@ light_bulb_demo = no
 # Possible values: yes or no
 soc_simulation = yes
 
+# Precharge simulation
+# In EVSE mode simulate precharging rather than using physical value
+evse_simulate_precharge = yes
+
 # Device selection for the digital outputs, for CP state and power relays
 # Possible options:
 #  dieter: Serial controlled device, which controls the digital outputs. E.g. arduino from https://github.com/uhi22/dieter
@@ -52,6 +56,7 @@ soc_simulation = yes
 digital_output_device = dieter
 #digital_output_device = beaglebone
 #digital_output_device = celeron55device
+#digital_output_device = mqtt
 
 
 # Device to read the physically measured inlet voltage in PevMode
@@ -62,6 +67,7 @@ digital_output_device = dieter
 #analog_input_device = dieter
 analog_input_device = none
 #analog_input_device = celeron55device
+#analog_input_device = mqtt
 
 
 # Criteria for ending the PreCharge phase in PevMode
@@ -89,6 +95,9 @@ u_delta_max_for_end_of_precharge = 10
 #   auto
 serial_port = auto
 serial_baud = 19200
+# MQTT broker and base topic in case MQTT is used
+mqtt_broker = localhost
+mqtt_topic = pyPlc
 
 # The target voltage used in the CurrentDemandRequest.
 # This is a value for first try-outs. Better would
@@ -121,11 +130,13 @@ udp_syslog_enable = Yes
 # Set backend for obtaining charging parameters, we start with CHAdeMO CAN for now
 # Need to make a simulator device and maybe a celeron device?
 # Possible values:
+#  mqtt: pyPLC is used as a bridge between an MQTT broker and the car or EVSE
 #  chademo: pyPLC is used as bridge between a CCS charger and a CHAdeMO* car.
 #           Limitations/explanations here: https://openinverter.org/forum/viewtopic.php?p=57894#p57894 and
 #           https://openinverter.org/forum/viewtopic.php?t=1063 (Is it possible to make a CCS to CHAdeMO adapter?)
 #  none: all other use cases
 charge_parameter_backend = chademo
+#charge_parameter_backend = mqtt
 
 # REST callback for SoC states. Comment out to disable. Do not leave a trailing slash
 # This parameter is used in EvseMode, to configure where the data which is retrieved

fsmEvse.py

@@ -27,6 +27,7 @@ class fsmEvse():
 
     def publishStatus(self, s):
         self.callbackShowStatus(s, "evseState")
+        self.hardwareInterface.displayState(s)
 
     def publishSoCs(self, current_soc: int, full_soc: int = -1, energy_capacity: int = -1, energy_request: int = -1, evccid: str = "", origin: str = ""):
         if self.callbackSoCStatus is not None:
@@ -223,7 +224,11 @@ class fsmEvse():
                     self.simulatedPresentVoltage += 20
                 if (self.simulatedPresentVoltage<uTarget):
                     self.simulatedPresentVoltage += 5
-                strPresentVoltage = str(self.simulatedPresentVoltage) # "345"
+                    
+                if getConfigValueBool('evse_simulate_precharge'):
+                    strPresentVoltage = str(self.simulatedPresentVoltage) # "345"
+                else:
+                    strPresentVoltage = str(self.hardwareInterface.getInletVoltage())
                 self.callbackShowStatus(strPresentVoltage, "EVSEPresentVoltage")
                 msg = addV2GTPHeader(exiEncode("EDg_"+strPresentVoltage)) # EDg for Encode, Din, PreChargeResponse
                 if (testsuite_faultinjection_is_triggered(TC_EVSE_Shutdown_during_PreCharge)):
@@ -255,7 +260,11 @@ class fsmEvse():
                     strEVTargetVoltageValue = jsondict["EVTargetVoltage.Value"]
                     strEVTargetVoltageMultiplier = jsondict["EVTargetVoltage.Multiplier"]
                     uTarget = combineValueAndMultiplier(strEVTargetVoltageValue, strEVTargetVoltageMultiplier)
-                    self.addToTrace("EV wants EVTargetVoltage " + str(uTarget))
+                    strEVTargetCurrentValue = jsondict["EVTargetCurrent.Value"]
+                    strEVTargetCurrentMultiplier = jsondict["EVTargetCurrent.Multiplier"]
+                    iTarget = combineValueAndMultiplier(strEVTargetCurrentValue, strEVTargetCurrentMultiplier)
+                    self.addToTrace("EV wants EVTargetVoltage " + str(uTarget) + " and EVTargetCurrent " + str(iTarget))
+                    self.hardwareInterface.setPevRequest(uTarget, iTarget)
                     current_soc = int(jsondict.get("DC_EVStatus.EVRESSSOC", -1))
                     full_soc = int(jsondict.get("FullSOC", -1))
                     energy_capacity = int(jsondict.get("EVEnergyCapacity.Value", -1))
@@ -268,9 +277,9 @@ class fsmEvse():
                 except:
                     self.addToTrace("ERROR: Could not decode the CurrentDemandReq")
                 self.simulatedPresentVoltage = uTarget + 3*random() # The charger provides the voltage which is demanded by the car.
-                strPresentVoltage = str(self.simulatedPresentVoltage)
+                strPresentVoltage = str(self.hardwareInterface.getInletVoltage()) #str(self.simulatedPresentVoltage)
                 self.callbackShowStatus(strPresentVoltage, "EVSEPresentVoltage")
-                strEVSEPresentCurrent = "1" # Just as a dummy current
+                strEVSEPresentCurrent = str(self.hardwareInterface.getAccuMaxCurrent()) #"1" # Just as a dummy current
                 if (self.blChargeStopTrigger == 1):
                     # User pressed the STOP button on the charger. Send EVSE_Shutdown.
                     self.addToTrace("User pressed the STOP button on the charger. Sending EVSE_Shutdown.")
@@ -378,7 +387,7 @@ class fsmEvse():
         self.callbackShowStatus = callbackShowStatus
         self.callbackSoCStatus = callbackSoCStatus
         #todo self.addressManager = addressManager
-        #todo self.hardwareInterface = hardwareInterface
+        self.hardwareInterface = hardwareInterface
         self.addToTrace("initializing fsmEvse")
         self.faultInjectionDelayUntilSocketOpen_s = 0
         if (self.faultInjectionDelayUntilSocketOpen_s>0):

hardwareInterface.py

@@ -15,6 +15,10 @@ import sys # For exit_on_session_end hack
 PinCp = "P9_41"
 PinPowerRelay = "P9_17"
 
+if (getConfigValue("digital_output_device")=="mqtt"):
+    # If we use MQTT as a hardware interface import it here
+    import paho.mqtt.client as mqtt
+
 if (getConfigValue("digital_output_device")=="beaglebone"):
     # In case we run on beaglebone, we want to use GPIO ports.
     import Adafruit_BBIO.GPIO as GPIO
@@ -85,12 +89,18 @@ class hardwareInterface():
     def addToTrace(self, s):
         self.callbackAddToTrace("[HARDWAREINTERFACE] " + s)            
 
+    def displayState(self, state):
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/fsm_state", state)
+    
     def setStateB(self):
         self.addToTrace("Setting CP line into state B.")
         if (getConfigValue("digital_output_device")=="beaglebone"):
             GPIO.output(PinCp, GPIO.LOW)
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("cp=0\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/cpstate", "B")
         self.outvalue &= ~1
         
     def setStateC(self):
@@ -99,6 +109,8 @@ class hardwareInterface():
             GPIO.output(PinCp, GPIO.HIGH)
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("cp=1\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/cpstate", "C")
         self.outvalue |= 1
         
     def setPowerRelayOn(self):
@@ -107,6 +119,8 @@ class hardwareInterface():
             GPIO.output(PinPowerRelay, GPIO.HIGH)
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("contactor=1\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/relay_request", "on")
         self.outvalue |= 2
 
     def setPowerRelayOff(self):
@@ -115,6 +129,8 @@ class hardwareInterface():
             GPIO.output(PinPowerRelay, GPIO.LOW)
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("contactor=0\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/relay_request", "off")
         self.outvalue &= ~2
 
     def setRelay2On(self):
@@ -134,12 +150,16 @@ class hardwareInterface():
         self.addToTrace("Locking the connector")
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("lock\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/lock_request", "lock")
         # todo control the lock motor into lock direction until the end (time based or current based stopping?)
 
     def triggerConnectorUnlocking(self):
-        self.addToTrace("Unocking the connector")
+        self.addToTrace("Unlocking the connector")
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.ser.write(bytes("unlock\n", "utf-8"))
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/lock_request", "unlock")
         # todo control the lock motor into unlock direction until the end (time based or current based stopping?)
 
     def isConnectorLocked(self):
@@ -148,13 +168,27 @@ class hardwareInterface():
         #    return self.lock_confirmed
         return 1 # todo: use the real connector lock feedback
         
+    def setPevRequest(self, voltage, current):
+        #here we can publish the voltage and current requests received from the PEV side
+        if getConfigValue("charge_parameter_backend") == "mqtt":
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/pev_voltage", str(voltage))
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/pev_current", str(current))
+    
     def setChargerParameters(self, maxVoltage, maxCurrent):
+        self.addToTrace("Setting charger parameters maxVoltage=%d V, maxCurrent=%d A" % (maxVoltage, maxCurrent))
         self.maxChargerVoltage = int(maxVoltage)
         self.maxChargerCurrent = int(maxCurrent)
+        if getConfigValue("charge_parameter_backend") == "mqtt":
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/charger_max_voltage", str(maxVoltage))
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/charger_max_current", str(maxCurrent))
         
     def setChargerVoltageAndCurrent(self, voltageNow, currentNow):
+        self.addToTrace("Setting charger present values Voltage=%d V, Current=%d A" % (voltageNow, currentNow))
         self.chargerVoltage = int(voltageNow)
         self.chargerCurrent = int(currentNow)
+        if getConfigValue("charge_parameter_backend") == "mqtt":
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/charger_voltage", voltageNow)
+            self.mqttclient.publish(getConfigValue("mqtt_topic") + "/charger_current", currentNow)
 
     def getInletVoltage(self):
         # uncomment this line, to take the simulated inlet voltage instead of the really measured
@@ -162,9 +196,7 @@ class hardwareInterface():
         return self.inletVoltage
         
     def getAccuVoltage(self):
-        if (getConfigValue("digital_output_device")=="celeron55device"):
+        if getConfigValue("charge_parameter_backend") in ["chademo", "mqtt", "celeron55device"]:
-            return self.accuVoltage
-        elif getConfigValue("charge_parameter_backend")=="chademo":
            return self.accuVoltage 
         #todo: get real measured voltage from the accu
         self.accuVoltage = 230
@@ -178,15 +210,15 @@ class hardwareInterface():
             if self.accuMaxCurrent >= EVMaximumCurrentLimit:
                 return EVMaximumCurrentLimit
             return self.accuMaxCurrent
-        elif getConfigValue("charge_parameter_backend")=="chademo":
+        elif getConfigValue("charge_parameter_backend") in ["chademo", "mqtt"]:
-            return self.accuMaxCurrent #set by CAN        
+            return self.accuMaxCurrent #set by CAN or MQTT
         #todo: get max charging current from the BMS
         self.accuMaxCurrent = 10
         return self.accuMaxCurrent
 
     def getAccuMaxVoltage(self):
-        if getConfigValue("charge_parameter_backend")=="chademo":
+        if getConfigValue("charge_parameter_backend") in ["chademo", "mqtt"]:
-            return self.accuMaxVoltage #set by CAN
+            return self.accuMaxVoltage #set by CAN or MQTT
         elif getConfigValue("charge_target_voltage"):
             self.accuMaxVoltage = getConfigValue("charge_target_voltage")            
         else:
@@ -205,7 +237,7 @@ class hardwareInterface():
     def getSoc(self):
         if self.callbackShowStatus:
             self.callbackShowStatus(format(self.soc_percent,".1f"), "soc")
-        if (getConfigValue("digital_output_device")=="celeron55device"):
+        if (getConfigValue("digital_output_device") in ["celeron55device", "mqtt"]):
             return self.soc_percent
         #todo: get SOC from the BMS
         self.callbackShowStatus(format(self.simulatedSoc,".1f"), "soc")
@@ -224,6 +256,12 @@ class hardwareInterface():
             GPIO.setup(PinPowerRelay, GPIO.OUT) #output for port relays
             GPIO.setup(PinCp, GPIO.OUT) #output for CP
             
+        if (getConfigValue("digital_output_device") == "mqtt"):
+        	self.mqttclient = mqtt.Client()
+        	self.mqttclient.on_connect = self.mqtt_on_connect
+        	self.mqttclient.on_message = self.mqtt_on_message
+        	self.mqttclient.connect(getConfigValue("mqtt_broker"), 1883, 60)
+        
     def __init__(self, callbackAddToTrace=None, callbackShowStatus=None):
         self.callbackAddToTrace = callbackAddToTrace
         self.callbackShowStatus = callbackShowStatus
@@ -381,6 +419,9 @@ class hardwareInterface():
         if (getConfigValue("digital_output_device")=="celeron55device"):
             self.mainfunction_celeron55device()
 
+        if (getConfigValue("digital_output_device")=="mqtt"):
+            self.mainfunction_mqtt()
+
         if getConfigValueBool("exit_on_session_end"):
             # TODO: This is a hack. Do this in fsmPev instead and publish some
             # of these values into there if needed.
@@ -459,6 +500,35 @@ class hardwareInterface():
               self.addToTrace("CHAdeMO: No current limit update for over 1s, setting current to 0")
            self.accuMaxCurrent = 0
            
+    def mainfunction_mqtt(self):
+    	self.mqttclient.loop(timeout=0.1)
+        
+	# The callback for when the client receives a CONNACK response from the server.
+    def mqtt_on_connect(self, client, userdata, flags, rc):
+        self.addToTrace(f"MQTT connected with result code {rc}")
+
+        # Subscribing in on_connect() means that if we lose the connection and
+        # reconnect then subscriptions will be renewed.
+        client.subscribe(getConfigValue("mqtt_topic") + "/#")
+
+    def mqtt_on_message(self, client, userdata, msg):
+        if msg.topic == getConfigValue("mqtt_topic") + "/battery_voltage":
+            self.accuVoltage = float(msg.payload)
+            self.addToTrace("MQTT: Set battery voltage to %f V" % self.accuVoltage)
+        elif msg.topic == getConfigValue("mqtt_topic") + "/target_voltage":
+            self.accuMaxVoltage = float(msg.payload)
+            self.addToTrace("MQTT: Set target voltage to %f V" % self.accuMaxVoltage)
+        elif msg.topic == getConfigValue("mqtt_topic") + "/target_current":
+            self.accuMaxCurrent = float(msg.payload)
+            self.addToTrace("MQTT: Set current request to %f A" % self.accuMaxCurrent)
+        elif msg.topic == getConfigValue("mqtt_topic") + "/soc":
+            self.simulatedSoc = float(msg.payload)
+            self.soc_percent = self.simulatedSoc
+            self.addToTrace("MQTT: Set SoC to %f %%" % self.simulatedSoc)
+        elif msg.topic == getConfigValue("mqtt_topic") + "/inlet_voltage":
+            self.inletVoltage = float(msg.payload)
+            self.addToTrace("MQTT: Set inlet voltage to %f V" % self.inletVoltage)
+
 def myPrintfunction(s):
     print("myprint " + s)
 
@@ -469,6 +539,8 @@ if __name__ == "__main__":
         hw.mainfunction()
         if (i==20):
             hw.showOnDisplay("Hello", "A DEMO", "321.0V")
+            hw.setChargerParameters(500, 125)
+            hw.setChargerVoltageAndCurrent(360, 100)
         if (i==50):
             hw.setStateC()
         if (i==100):
@@ -486,6 +558,6 @@ if __name__ == "__main__":
             hw.setRelay2Off()
         if (i==320):
             hw.showOnDisplay("This", "...is...", "DONE :-)")
-        sleep(0.03)
+        sleep(0.01)
     hw.close()    
     print("finished.")

simulateMqttBackend.py

@@ -0,0 +1,26 @@
+import paho.mqtt.client as mqtt
+from configmodule import getConfigValue, getConfigValueBool
+
+def mqtt_on_connect(client, userdata, flags, rc):
+    client.subscribe(getConfigValue("mqtt_topic") + "/#")
+
+def mqtt_on_message(client, userdata, msg):
+    global simulatedInletVoltage
+    if msg.topic == getConfigValue("mqtt_topic") + "/fsm_state":
+        if "CableCheck" in msg.payload.decode("utf-8"):
+            simulatedInletVoltage = 0
+        if "PreCharging" in msg.payload.decode("utf-8"):
+            client.publish(getConfigValue("mqtt_topic") + "/inlet_voltage", simulatedInletVoltage)
+            simulatedInletVoltage = simulatedInletVoltage + 15
+    elif msg.topic == getConfigValue("mqtt_topic") + "/pev_voltage":
+        client.publish(getConfigValue("mqtt_topic") + "/inlet_voltage", msg.payload)
+    elif msg.topic == getConfigValue("mqtt_topic") + "/pev_current":
+        client.publish(getConfigValue("mqtt_topic") + "/target_current", msg.payload)
+
+simulatedInletVoltage = 0
+mqttclient = mqtt.Client()
+mqttclient.on_connect = mqtt_on_connect
+mqttclient.on_message = mqtt_on_message
+mqttclient.connect(getConfigValue("mqtt_broker"), 1883, 60)
+
+mqttclient.loop_forever()