VictronGX_Custom_Sensors/dbus-node-red-meter-einspeisung/meter_einspeisung.py

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2022-08-09 22:38:46 +00:00
#!/usr/bin/env python
try:
import gobject # Python 2.x
except:
from gi.repository import GLib as gobject # Python 3.x
import platform
import logging
import sys
import os
import requests # for http GET
try:
import thread # for daemon = True / Python 2.x
except:
import _thread as thread # for daemon = True / Python 3.x
# our own packages
sys.path.insert(1, os.path.join(os.path.dirname(__file__), '../ext/velib_python'))
from vedbus import VeDbusService
path_UpdateIndex = '/UpdateIndex'
class DbusDummyService:
def __init__(self, servicename, deviceinstance, paths, productname='Custom Smart Meter', connection='NodeRED local'):
self._dbusservice = VeDbusService(servicename)
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/Connection', connection)
# Create the mandatory objects
self._dbusservice.add_path('/DeviceInstance', deviceinstance)
self._dbusservice.add_path('/ProductId', 16) # grid meter symbol
self._dbusservice.add_path('/ProductName', productname)
self._dbusservice.add_path('/FirmwareVersion', 1.0)
self._dbusservice.add_path('/HardwareVersion', 0)
self._dbusservice.add_path('/Connected', 1)
for path, settings in self._paths.items():
self._dbusservice.add_path(
path, settings['initial'], writeable=True, onchangecallback=self._handlechangedvalue)
gobject.timeout_add(1000, self._update) # pause 1000ms before the next request
def _update(self):
try:
nodered_url = "http://localhost:1880/meters"
nodered_r = requests.get(url=nodered_url) # request data from the Fronius PV inverter
nodered_data = nodered_r.json() # convert JSON data
self._dbusservice['/Ac/Power'] = nodered_data['einspeisung']['total_power']
self._dbusservice['/Ac/L1/Voltage'] = nodered_data['einspeisung']['l1_voltage']
self._dbusservice['/Ac/L2/Voltage'] = nodered_data['einspeisung']['l2_voltage']
self._dbusservice['/Ac/L3/Voltage'] = nodered_data['einspeisung']['l3_voltage']
self._dbusservice['/Ac/L1/Current'] = nodered_data['einspeisung']['l1_current']
self._dbusservice['/Ac/L2/Current'] = nodered_data['einspeisung']['l2_current']
self._dbusservice['/Ac/L3/Current'] = nodered_data['einspeisung']['l3_current']
self._dbusservice['/Ac/L1/Power'] = nodered_data['einspeisung']['l1_power']
self._dbusservice['/Ac/L2/Power'] = nodered_data['einspeisung']['l2_power']
self._dbusservice['/Ac/L3/Power'] = nodered_data['einspeisung']['l3_power']
self._dbusservice['/Ac/Energy/Forward'] = nodered_data['einspeisung']['total_import']
self._dbusservice['/Ac/Energy/Reverse'] = nodered_data['einspeisung']['total_export']
logging.info("Total power: {:.0f}".format(nodered_data['einspeisung']['total_power']))
except:
logging.info("WARNING: Could not read from Node Red, check if Node Red service is running")
self._dbusservice['/Ac/Power'] = 0
self._dbusservice['/Ac/L1/Voltage'] = 0
self._dbusservice['/Ac/L2/Voltage'] = 0
self._dbusservice['/Ac/L3/Voltage'] = 0
self._dbusservice['/Ac/L1/Current'] = 0
self._dbusservice['/Ac/L2/Current'] = 0
self._dbusservice['/Ac/L3/Current'] = 0
self._dbusservice['/Ac/L1/Power'] = 0
self._dbusservice['/Ac/L2/Power'] = 0
self._dbusservice['/Ac/L3/Power'] = 0
index = self._dbusservice[path_UpdateIndex] + 1 # increment index
if index > 255: # maximum value of the index
index = 0 # overflow from 255 to 0
self._dbusservice[path_UpdateIndex] = index
return True
def _handlechangedvalue(self, path, value):
logging.debug("someone else updated %s to %s" % (path, value))
return True # accept the change
def main():
logging.basicConfig(level=logging.DEBUG) # use .INFO for less logging
thread.daemon = True # allow the program to quit
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)
pvac_output = DbusDummyService(
servicename='com.victronenergy.grid',
deviceinstance=0,
paths={
'/Ac/Power': {'initial': 0},
'/Ac/L1/Voltage': {'initial': 0},
'/Ac/L2/Voltage': {'initial': 0},
'/Ac/L3/Voltage': {'initial': 0},
'/Ac/L1/Current': {'initial': 0},
'/Ac/L2/Current': {'initial': 0},
'/Ac/L3/Current': {'initial': 0},
'/Ac/L1/Power': {'initial': 0},
'/Ac/L2/Power': {'initial': 0},
'/Ac/L3/Power': {'initial': 0},
'/Ac/Energy/Forward': {'initial': 0},
'/Ac/Energy/Reverse': {'initial': 0},
path_UpdateIndex: {'initial': 0},
})
logging.info('Connected to dbus, and switching over to gobject.MainLoop() (= event based)')
mainloop = gobject.MainLoop()
mainloop.run()
if __name__ == "__main__":
main()