dbus-evsecharger.py

#!/usr/bin/env python

# import normal packages
import platform
import logging
import os
import sys

if sys.version_info.major == 2:
    import gobject
else:
    from gi.repository import GLib as gobject
import sys
import time
import requests  # for http GET
import configparser  # for config/ini file

# our own packages from victron
sys.path.insert(1, os.path.join(os.path.dirname(__file__), '/opt/victronenergy/dbus-systemcalc-py/ext/velib_python'))
from vedbus import VeDbusService


class DbusEvseChargerService:
    def __init__(self, servicename, paths, productname='EVSE-Charger', connection='OpenEVSE JSON RAPI'):
        config = self._getConfig()
        deviceinstance = int(config['DEFAULT']['Deviceinstance'])

        self._dbusservice = VeDbusService("{}.http_{:02d}".format(servicename, deviceinstance))
        self._paths = paths

        logging.debug("%s /DeviceInstance = %d" % (servicename, deviceinstance))

        paths_wo_unit = [
            '/Status',
            # value 'state' EVSE State - 1 Not Connected - 2 Connected - 3 Charging - 4 Error, 254 - sleep, 255 - disabled
		# old_goecharger 1: charging station ready, no vehicle 2: vehicle loads 3: Waiting for vehicle 4: Charge finished, vehicle still connected
            '/Mode'
        ]

        # get data from go-eCharger
        data = self._getEvseChargerData()

        # Create the management objects, as specified in the ccgx dbus-api document
        self._dbusservice.add_path('/Mgmt/ProcessName', __file__)
        self._dbusservice.add_path('/Mgmt/ProcessVersion',
                                   'Unkown version, and running on Python ' + platform.python_version())
        self._dbusservice.add_path('/Mgmt/Connection', connection)

        # Create the mandatory objects
        self._dbusservice.add_path('/DeviceInstance', deviceinstance)
        self._dbusservice.add_path('/ProductId', 0xFFFF)  #
        self._dbusservice.add_path('/ProductName', productname)
        self._dbusservice.add_path('/CustomName', productname)
        self._dbusservice.add_path('/FirmwareVersion', int(data['divert_update']))
        self._dbusservice.add_path('/HardwareVersion', 2)
        self._dbusservice.add_path('/Serial', data['comm_success'])
        self._dbusservice.add_path('/Connected', 1)
        self._dbusservice.add_path('/UpdateIndex', 0)

        # add paths without units
        for path in paths_wo_unit:
            self._dbusservice.add_path(path, None)

        # add path values to dbus
        for path, settings in self._paths.items():
            self._dbusservice.add_path(
                path, settings['initial'], gettextcallback=settings['textformat'], writeable=True,
                onchangecallback=self._handlechangedvalue)

        # last update
        self._lastUpdate = 0

        # charging time in float
        self._chargingTime = 0.0

        # add _update function 'timer'
        gobject.timeout_add(2000, self._update)  # pause 2sec before the next request

        # add _signOfLife 'timer' to get feedback in log every 5minutes
        gobject.timeout_add(self._getSignOfLifeInterval() * 60 * 1000, self._signOfLife)

    def _getConfig(self):
        config = configparser.ConfigParser()
        config.read("%s/config.ini" % (os.path.dirname(os.path.realpath(__file__))))
        return config

    def _getSignOfLifeInterval(self):
        config = self._getConfig()
        value = config['DEFAULT']['SignOfLifeLog']

        if not value:
            value = 0

        return int(value)

    def _getEvseChargerStatusUrl(self):
        config = self._getConfig()
        accessType = config['DEFAULT']['AccessType']

        if accessType == 'OnPremise':
            URL = "http://%s/status" % (config['ONPREMISE']['Host'])
        else:
            raise ValueError("AccessType %s is not supported" % (config['DEFAULT']['AccessType']))

        return URL

    def _getEvseChargerMqttPayloadUrl(self, parameter, value):
        config = self._getConfig()
        accessType = config['DEFAULT']['AccessType']

        if accessType == 'OnPremise':
            URL = "http://%s/r?json=1&rapi=$%s%s" % (config['ONPREMISE']['Host'], parameter, value)
        else:
            raise ValueError("AccessType %s is not supported" % (config['DEFAULT']['AccessType']))

        return URL

    def _setEvseChargerValue(self, parameter, value):
        URL = self._getEvseChargerMqttPayloadUrl(parameter, str(value))
        request_data = requests.get(url=URL)

        # check for response
        if not request_data:
            raise ConnectionError("No response from Evse-Charger - %s" % (URL))

        json_data = request_data.json()

        # check for Json
        if not json_data:
            raise ValueError("Converting response to JSON failed")

        if json_data[parameter] == str(value):
            return True
        else:
            logging.warning("Evse-Charger parameter %s not set to %s" % (parameter, str(value)))
            return False

    def _getEvseChargerData(self):
        URL = self._getEvseChargerStatusUrl()
        request_data = requests.get(url=URL)

        # check for response
        if not request_data:
            raise ConnectionError("No response from Evse-Charger - %s" % (URL))

        json_data = request_data.json()

        # check for Json
        if not json_data:
            raise ValueError("Converting response to JSON failed")

        return json_data

    def _signOfLife(self):
        logging.info("--- Start: sign of life ---")
        logging.info("Last _update() call: %s" % (self._lastUpdate))
        logging.info("Last '/Ac/Power': %s" % (self._dbusservice['/Ac/Power']))
        logging.info("--- End: sign of life ---")
        return True

    def _update(self):
        try:
            # get data from go-eCharger
            data = self._getEvseChargerData()

            # send data to DBus
	    voltage = int(data['voltage'])
            self._dbusservice['/Ac/L1/Power'] = int(data['amp'] * voltage / 1000)
            self._dbusservice['/Ac/L2/Power'] = 0
            self._dbusservice['/Ac/L3/Power'] = 0
            self._dbusservice['/Ac/Power'] = int(data['amp'] * voltage / 1000)
            self._dbusservice['/Ac/Voltage'] = voltage
            self._dbusservice['/Current'] = float(data['amp'] / 1000)
            self._dbusservice['/Ac/Energy/Forward'] = float(data['wattsec'] / 3600000)  # int(float(data['eto']) / 10.0)
            if int(data['state']) == 1 or int(data['state']) == 3:
                self._dbusservice['/StartStop'] = 1
            else:
                self._dbusservice['/StartStop'] = 0

#            self._dbusservice['/StartStop'] = int(data['divertmode'])
            self._dbusservice['/SetCurrent'] = int(data['pilot'])
            self._dbusservice['/MaxCurrent'] = 32  # int(data['ama'])

            # update chargingTime, increment charge time only on active charging (2), reset when no car connected (1)
            timeDelta = time.time() - self._lastUpdate
            if int(data['state']) == 3 and self._lastUpdate > 0:  # vehicle loads
                self._chargingTime += timeDelta
            elif int(data['state']) == 1:  # charging station ready, no vehicle
                self._chargingTime = 0
            self._dbusservice['/ChargingTime'] = int(self._chargingTime)

            self._dbusservice['/Mode'] = 0  # Manual, no control
            self._dbusservice['/MCU/Temperature'] = int(data['temp1'])

	# 'state' EVSE State - 1 Not Connected - 2 Connected - 3 Charging - 4 Error, 254 - sleep, 255 - disabled
            # value 'car' 1: charging station ready, no vehicle 2: vehicle loads 3: Waiting for vehicle 4: Charge finished, vehicle still connected
	# 0:EVdisconnected; 1:Connected; 2:Charging; 3:Charged; 4:Wait sun; 5:Wait RFID; 6:Wait enable; 7:Low SOC; 8:Ground error; 9:Welded contacts error; defaut:Unknown;
            status = 0
            if int(data['state']) == 1:
                status = 0
            elif int(data['state']) == 2:
                status = 1
            elif int(data['state']) == 3:
                status = 2
            elif int(data['state']) ==4:
                status = 8
            elif int(data['state']) ==255:
                status = 6
            elif int(data['state']) ==254:
                status = 4
            self._dbusservice['/Status'] = status

            # logging
            logging.debug("Wallbox Consumption (/Ac/Power): %s" % (self._dbusservice['/Ac/Power']))
            logging.debug("Wallbox Forward (/Ac/Energy/Forward): %s" % (self._dbusservice['/Ac/Energy/Forward']))
            logging.debug("---")

            # increment UpdateIndex - to show that new data is available
            index = self._dbusservice['/UpdateIndex'] + 1  # increment index
            if index > 255:  # maximum value of the index
                index = 0  # overflow from 255 to 0
            self._dbusservice['/UpdateIndex'] = index

            # update lastupdate vars
            self._lastUpdate = time.time()
        except Exception as e:
            logging.critical('Error at %s', '_update', exc_info=e)

        # return true, otherwise add_timeout will be removed from GObject - see docs http://library.isr.ist.utl.pt/docs/pygtk2reference/gobject-functions.html#function-gobject--timeout-add
        return True

    def _handlechangedvalue(self, path, value):
        logging.info("someone else updated %s to %s" % (path, value))

        if path == '/SetCurrent':
            return self._setEvseChargerValue('SC+', value)
        elif path == '/StartStop':
            return self._setEvseChargerValue('F', '1') #F1
        elif path == '/MaxCurrent':
            return self._setEvseChargerValue('ama', value)
        else:
            logging.info("mapping for evcharger path %s does not exist" % (path))
            return False


def main():
    # configure logging
    logging.basicConfig(format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S',
                        level=logging.INFO,
                        handlers=[
                            logging.FileHandler("%s/current.log" % (os.path.dirname(os.path.realpath(__file__)))),
                            logging.StreamHandler()
                        ])

    try:
        logging.info("Start")

        from dbus.mainloop.glib import DBusGMainLoop
        # Have a mainloop, so we can send/receive asynchronous calls to and from dbus
        DBusGMainLoop(set_as_default=True)

        # formatting
        _kwh = lambda p, v: (str(round(v, 2)) + 'kWh')
        _a = lambda p, v: (str(round(v, 1)) + 'A')
        _w = lambda p, v: (str(round(v, 1)) + 'W')
        _v = lambda p, v: (str(round(v, 1)) + 'V')
        _degC = lambda p, v: (str(v) + '°C')
        _s = lambda p, v: (str(v) + 's')

        # start our main-service
        pvac_output = DbusEvseChargerService(
            servicename='com.victronenergy.evcharger',
            paths={
                '/Ac/Power': {'initial': 0, 'textformat': _w},
                '/Ac/L1/Power': {'initial': 0, 'textformat': _w},
                '/Ac/L2/Power': {'initial': 0, 'textformat': _w},
                '/Ac/L3/Power': {'initial': 0, 'textformat': _w},
                '/Ac/Energy/Forward': {'initial': 0, 'textformat': _kwh},
                '/ChargingTime': {'initial': 0, 'textformat': _s},

                '/Ac/Voltage': {'initial': 0, 'textformat': _v},
                '/Current': {'initial': 0, 'textformat': _a},
                '/SetCurrent': {'initial': 0, 'textformat': _a},
                '/MaxCurrent': {'initial': 0, 'textformat': _a},
                '/MCU/Temperature': {'initial': 0, 'textformat': _degC},
                '/StartStop': {'initial': 0, 'textformat': lambda p, v: (str(v))}
            }
        )

        logging.info('Connected to dbus, and switching over to gobject.MainLoop() (= event based)')
        mainloop = gobject.MainLoop()
        mainloop.run()
    except Exception as e:
        logging.critical('Error at %s', 'main', exc_info=e)


if __name__ == "__main__":
    main()