#!/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 # 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 NodeRedPVinverter: def __init__(self, servicename, deviceinstance, paths, productname='PV-Inverter', connection='Node RED HTTP JSON service'): 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', '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', 1.0) self._dbusservice.add_path('/HardwareVersion', 0) self._dbusservice.add_path('/Connected', 1) self._dbusservice.add_path('/Position', 0) self._dbusservice.add_path('/Serial', 12345678) self._dbusservice.add_path('/UpdateIndex', 0) self._dbusservice.add_path('/StatusCode', 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(500, self._update) # pause 500ms before the next request # add _Status 'timer' to get feedback in log every 5minutes gobject.timeout_add(self._getStatusInterval()*60*1000, self._Status) def _getStatusInterval(self): value = 1 if not value: value = 0 return int(value) def _getNodeRedData(self): URL = "http://localhost:1880/meters" meter_r = requests.get(url = URL) # check for response if not meter_r: raise ConnectionError("No response from NodeRed - %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 _Status(self): logging.debug("Last update: %s" % (self._lastUpdate)) logging.debug("Last '/Ac/Power': %s" % (self._dbusservice['/Ac/Power'])) return True def _update(self): try: #get data from NodeRed 3em meter_data = self._getNodeRedData() #send data to DBus self._dbusservice['/Ac/Voltage'] = meter_data['pv_inverter']['voltage'] self._dbusservice['/Ac/L1/Voltage'] = meter_data['pv_inverter']['voltage'] self._dbusservice['/Ac/Current'] = meter_data['pv_inverter']['current'] self._dbusservice['/Ac/L1/Current'] = meter_data['pv_inverter']['current'] self._dbusservice['/Ac/Power'] = meter_data['pv_inverter']['power'] self._dbusservice['/Ac/L1/Power'] = meter_data['pv_inverter']['power'] self._dbusservice['/Ac/Energy/Forward'] = meter_data['pv_inverter']['energy'] self._dbusservice['/Ac/L1/Energy/Forward'] = meter_data['pv_inverter']['energy'] #logging logging.debug("Inverter Power (/Ac/Power): %s" % (self._dbusservice['/Ac/Power'])) logging.debug("Inverter Energy(/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.debug("someone else updated %s to %s" % (path, value)) return True # accept the change 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 pvac_output = NodeRedPVinverter( servicename='com.victronenergy.pvinverter', deviceinstance=46, paths={ '/Ac/Energy/Forward': {'initial': None, 'textformat': _kwh}, # energy produced by pv inverter '/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/L2/Voltage': {'initial': 0, 'textformat': _v}, '/Ac/L3/Voltage': {'initial': 0, 'textformat': _v}, '/Ac/L1/Current': {'initial': 0, 'textformat': _a}, '/Ac/L2/Current': {'initial': 0, 'textformat': _a}, '/Ac/L3/Current': {'initial': 0, 'textformat': _a}, '/Ac/L1/Power': {'initial': 0, 'textformat': _w}, '/Ac/L2/Power': {'initial': 0, 'textformat': _w}, '/Ac/L3/Power': {'initial': 0, 'textformat': _w}, '/Ac/L1/Energy/Forward': {'initial': None, 'textformat': _kwh}, '/Ac/L2/Energy/Forward': {'initial': None, 'textformat': _kwh}, '/Ac/L3/Energy/Forward': {'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()