dbus-shelly-em-smartmeter.py

#!/usr/bin/env python

# import normal packages
import platform
import logging
import sys
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 DbusShellyemService:
  def __init__(self, servicename, paths, productname='Shelly EM', connection='Shelly EM HTTP JSON service'):
    config = self._getConfig()
    deviceinstance = int(config['DEFAULT']['Deviceinstance'])
    customname = config['DEFAULT']['CustomName']
    self._dbusservice = VeDbusService("{}.http_{:02d}".format(servicename, deviceinstance))
    self._paths = paths

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

    # 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', 16) # value used in ac_sensor_bridge.cpp of dbus-cgwacs
    #self._dbusservice.add_path('/ProductId', 0xFFFF) # id assigned by Victron Support from SDM630v2.py
    #self._dbusservice.add_path('/ProductId', 45069) # found on https://www.sascha-curth.de/projekte/005_Color_Control_GX.html#experiment - should be an ET340 Engerie Meter
    self._dbusservice.add_path('/ProductId', 0xB023) # id needs to be assigned by Victron Support current value for testing
    self._dbusservice.add_path('/DeviceType', 345) # found on https://www.sascha-curth.de/projekte/005_Color_Control_GX.html#experiment - should be an ET340 Engerie Meter
    self._dbusservice.add_path('/ProductName', productname)
    self._dbusservice.add_path('/CustomName', customname)
    self._dbusservice.add_path('/Latency', None)
    self._dbusservice.add_path('/FirmwareVersion', 0.1)
    self._dbusservice.add_path('/HardwareVersion', 0)
    self._dbusservice.add_path('/Connected', 1)
    self._dbusservice.add_path('/Role', 'grid')
    self._dbusservice.add_path('/Position', 0) # normaly only needed for pvinverter
    self._dbusservice.add_path('/Serial', self._getShellySerial())
    self._dbusservice.add_path('/UpdateIndex', 0)

    # 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

    # add _update function 'timer'
    gobject.timeout_add(250, self._update) # pause 250ms before the next request

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

  def _getShellySerial(self):
    meter_data = self._getShellyData()

    if not meter_data['mac']:
        raise ValueError("Response does not contain 'mac' attribute")

    serial = meter_data['mac']
    return serial


  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 _getMeterNoConfig(self):
        config = self._getconfig()
        MeterNo = config['DEFAULT']['GridOrPV']
        return MeterNo

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

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

    return URL


  def _getShellyData(self):
    URL = self._getShellyStatusUrl()
    meter_r = requests.get(url = URL)

    # check for response
    if not meter_r:
        raise ConnectionError("No response from Shelly EM - %s" % (URL))

    meter_data = meter_r.json()

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


    return meter_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 Shelly em
       meter_data = self._getShellyData()

       config = self._getConfig()
       MeterNo = int(config['DEFAULT']['MeterNo'])

       #send data to DBus
       self._dbusservice['/Ac/L1/Voltage'] = meter_data['emeters'][MeterNo]['voltage']
       current = meter_data['emeters'][MeterNo]['power'] / meter_data['emeters'][MeterNo]['voltage']
       self._dbusservice['/Ac/L1/Current'] = current
       self._dbusservice['/Ac/Current'] = current
       self._dbusservice['/Ac/L1/Power'] = meter_data['emeters'][MeterNo]['power']
       if meter_data['emeters'][MeterNo]['power'] != 0:
          self._dbusservice['/Ac/Power'] = self._dbusservice['/Ac/L1/Power']
       else:
          self._dbusservice['/Ac/L1/Voltage'] = 0
          self._dbusservice['/Ac/L1/Current'] = 0
          self._dbusservice['/Ac/L1/Power'] = 0
          self._dbusservice['/Ac/L1/Energy/Forward'] = 0
       self._dbusservice['/Ac/L1/Energy/Forward'] = (meter_data['emeters'][MeterNo]['total']/1000)
       self._dbusservice['/Ac/L1/Energy/Reverse'] = (meter_data['emeters'][MeterNo]['total_returned']/1000)
       self._dbusservice['/Ac/Energy/Forward'] = self._dbusservice['/Ac/L1/Energy/Forward']
       self._dbusservice['/Ac/Energy/Reverse'] = self._dbusservice['/Ac/L1/Energy/Reverse']

       #logging
       logging.debug("House Consumption (/Ac/Power): %s" % (self._dbusservice['/Ac/Power']))
       logging.debug("House Forward (/Ac/Energy/Forward): %s" % (self._dbusservice['/Ac/Energy/Forward']))
       logging.debug("House Reverse (/Ac/Energy/Revers): %s" % (self._dbusservice['/Ac/Energy/Reverse']))
       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.debug("someone else updated %s to %s" % (path, value))
    return True # accept the change

def getServiceConfig():
    config = configparser.ConfigParser()
    config.read("%s/config.ini" % (os.path.dirname(os.path.realpath(__file__))))
    GridOrPV = config['DEFAULT']['GridOrPV']
    return GridOrPV


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')

      #start our main-service
      GridOrPV = getServiceConfig()
      pvac_output = DbusShellyemService(
        servicename='com.victronenergy.' + GridOrPV, #grid', #grid or pvinverter
        paths={
          '/Ac/Energy/Forward': {'initial': None, 'textformat': _kwh}, # energy bought from the grid
          '/Ac/Energy/Reverse': {'initial': None, 'textformat': _kwh}, # energy sold to the grid
          '/Ac/Power': {'initial': 0, 'textformat': _w},
          '/Ac/Current': {'initial': 0, 'textformat': _a},
          '/Ac/Voltage': {'initial': 0, 'textformat': _v},
          '/Ac/L1/Voltage': {'initial': 0, 'textformat': _v},
          '/Ac/L1/Current': {'initial': 0, 'textformat': _a},
          '/Ac/L1/Power': {'initial': 0, 'textformat': _w},
          '/Ac/L1/Energy/Forward': {'initial': None, 'textformat': _kwh},
          '/Ac/L1/Energy/Reverse': {'initial': None, 'textformat': _kwh},

        })

      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()