202 lines
7.8 KiB
Python
202 lines
7.8 KiB
Python
#!/usr/bin/env python
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# import normal packages
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import platform
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import logging
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import sys
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import os
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import sys
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if sys.version_info.major == 2:
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import gobject
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else:
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from gi.repository import GLib as gobject
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import sys
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import time
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import requests # for http GET
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# our own packages from victron
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sys.path.insert(1, os.path.join(os.path.dirname(__file__), '/opt/victronenergy/dbus-systemcalc-py/ext/velib_python'))
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from vedbus import VeDbusService
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class NodeRedPVinverter:
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def __init__(self, servicename, deviceinstance, paths, productname='PV-Inverter', connection='Node RED HTTP JSON service'):
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self._dbusservice = VeDbusService("{}.http_{:02d}".format(servicename, deviceinstance))
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self._paths = paths
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logging.debug("%s /DeviceInstance = %d" % (servicename, deviceinstance))
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# Create the management objects, as specified in the ccgx dbus-api document
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self._dbusservice.add_path('/Mgmt/ProcessName', __file__)
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self._dbusservice.add_path('/Mgmt/ProcessVersion', 'Python ' + platform.python_version())
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self._dbusservice.add_path('/Mgmt/Connection', connection)
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# Create the mandatory objects
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self._dbusservice.add_path('/DeviceInstance', deviceinstance)
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self._dbusservice.add_path('/ProductId', 0xFFFF)
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self._dbusservice.add_path('/ProductName', productname)
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self._dbusservice.add_path('/CustomName', productname)
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self._dbusservice.add_path('/FirmwareVersion', 1.0)
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self._dbusservice.add_path('/HardwareVersion', 0)
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self._dbusservice.add_path('/Connected', 0)
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self._dbusservice.add_path('/Position', 0)
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self._dbusservice.add_path('/Serial', 12345678)
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self._dbusservice.add_path('/UpdateIndex', 0)
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self._dbusservice.add_path('/StatusCode', 0)
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# add path values to dbus
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for path, settings in self._paths.items():
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self._dbusservice.add_path(
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path, settings['initial'], gettextcallback=settings['textformat'], writeable=True, onchangecallback=self._handlechangedvalue)
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# last update
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self._lastUpdate = 0
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# add _update function 'timer'
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gobject.timeout_add(500, self._update) # pause 500ms before the next request
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# add _Status 'timer' to get feedback in log every 5minutes
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gobject.timeout_add(self._getStatusInterval()*60*1000, self._Status)
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def _getStatusInterval(self):
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value = 1
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if not value:
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value = 0
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return int(value)
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# if there is a pv meter disconnect or some other error, set mandatory values to None to tidy up vrm view
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def _errorState(self):
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self._dbusservice['/Connected'] = 0
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self._dbusservice['/Ac/Voltage'] = None
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self._dbusservice['/Ac/L1/Voltage'] = None
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self._dbusservice['/Ac/Current'] = None
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self._dbusservice['/Ac/L1/Current'] = None
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self._dbusservice['/Ac/Power'] = None
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self._dbusservice['/Ac/L1/Power'] = None
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return True
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def _getNodeRedData(self):
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URL = "http://localhost:1880/meters"
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meter_r = requests.get(url = URL)
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# check for response
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if not meter_r:
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self._errorState()
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raise ConnectionError("No response from NodeRed - %s" % (URL))
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meter_data = meter_r.json()
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# check for Json
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if not meter_data:
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self._errorState()
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raise ValueError("Converting response to JSON failed")
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# if there is no error parsing data, set connected to true
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self._dbusservice['/Connected'] = 1
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return meter_data
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def _Status(self):
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logging.debug("Last update: %s" % (self._lastUpdate))
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logging.debug("Last '/Ac/Power': %s" % (self._dbusservice['/Ac/Power']))
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return True
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def _update(self):
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try:
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#get data from NodeRed
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meter_data = self._getNodeRedData()
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#send data to DBus
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self._dbusservice['/Ac/Voltage'] = meter_data['pv_inverter']['voltage']
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self._dbusservice['/Ac/L1/Voltage'] = meter_data['pv_inverter']['voltage']
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self._dbusservice['/Ac/Current'] = meter_data['pv_inverter']['current']
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self._dbusservice['/Ac/L1/Current'] = meter_data['pv_inverter']['current']
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self._dbusservice['/Ac/Power'] = meter_data['pv_inverter']['power']
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self._dbusservice['/Ac/L1/Power'] = meter_data['pv_inverter']['power']
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self._dbusservice['/Ac/Energy/Forward'] = meter_data['pv_inverter']['energy']
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self._dbusservice['/Ac/L1/Energy/Forward'] = meter_data['pv_inverter']['energy']
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#logging
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logging.debug("Inverter Power (/Ac/Power): %s" % (self._dbusservice['/Ac/Power']))
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logging.debug("Inverter Energy(/Ac/Energy/Forward): %s" % (self._dbusservice['/Ac/Energy/Forward']))
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logging.debug("---");
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# increment UpdateIndex - to show that new data is available
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index = self._dbusservice['/UpdateIndex'] + 1 # increment index
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if index > 255: # maximum value of the index
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index = 0 # overflow from 255 to 0
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self._dbusservice['/UpdateIndex'] = index
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#update lastupdate vars
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self._lastUpdate = time.time()
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except Exception as e:
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self._errorState()
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logging.critical('Error at %s', '_update', exc_info=e)
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# 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
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return True
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def _handlechangedvalue(self, path, value):
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logging.debug("someone else updated %s to %s" % (path, value))
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return True # accept the change
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def main():
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#configure logging
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logging.basicConfig( format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
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datefmt='%Y-%m-%d %H:%M:%S',
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level=logging.INFO,
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#handlers=[
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# logging.FileHandler("%s/current.log" % (os.path.dirname(os.path.realpath(__file__)))),
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# logging.StreamHandler()
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#])
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)
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try:
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logging.info("Start");
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from dbus.mainloop.glib import DBusGMainLoop
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# Have a mainloop, so we can send/receive asynchronous calls to and from dbus
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DBusGMainLoop(set_as_default=True)
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#formatting
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_kwh = lambda p, v: (str(round(v, 2)) + ' KWh')
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_a = lambda p, v: (str(round(v, 1)) + ' A')
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_w = lambda p, v: (str(round(v, 1)) + ' W')
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_v = lambda p, v: (str(round(v, 1)) + ' V')
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#start our main-service
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pvac_output = NodeRedPVinverter(
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servicename='com.victronenergy.pvinverter',
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deviceinstance=46,
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paths={
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'/Ac/Energy/Forward': {'initial': None, 'textformat': _kwh}, # energy produced by pv inverter
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'/Ac/Power': {'initial': None, 'textformat': _w},
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'/Ac/Current': {'initial': None, 'textformat': _a},
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'/Ac/Voltage': {'initial': None, 'textformat': _v},
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'/Ac/L1/Voltage': {'initial': None, 'textformat': _v},
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'/Ac/L2/Voltage': {'initial': None, 'textformat': _v},
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'/Ac/L3/Voltage': {'initial': None, 'textformat': _v},
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'/Ac/L1/Current': {'initial': None, 'textformat': _a},
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'/Ac/L2/Current': {'initial': None, 'textformat': _a},
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'/Ac/L3/Current': {'initial': None, 'textformat': _a},
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'/Ac/L1/Power': {'initial': None, 'textformat': _w},
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'/Ac/L2/Power': {'initial': None, 'textformat': _w},
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'/Ac/L3/Power': {'initial': None, 'textformat': _w},
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'/Ac/L1/Energy/Forward': {'initial': None, 'textformat': _kwh},
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'/Ac/L2/Energy/Forward': {'initial': None, 'textformat': _kwh},
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'/Ac/L3/Energy/Forward': {'initial': None, 'textformat': _kwh},
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})
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logging.info('Connected to dbus, and switching over to gobject.MainLoop() (= event based)')
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mainloop = gobject.MainLoop()
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mainloop.run()
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except Exception as e:
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logging.critical('Error at %s', 'main', exc_info=e)
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if __name__ == "__main__":
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main() |