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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 from dbus.mainloop.glib import DBusGMainLoop
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5 from gi.repository import GLib
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6 import dbus
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7 import dbus.service
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8 import inspect
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9 import pprint
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10 import os
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11 import sys
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12
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13 # our own packages
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14 sys.path.insert(1, os.path.join(os.path.dirname(__file__), '../'))
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15 from vedbus import VeDbusService
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16
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17 softwareVersion = '1.0'
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18
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19 def validate_new_value(path, newvalue):
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20 # Max RPM setpoint = 1000
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21 return newvalue <= 1000
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22
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23 def get_text_for_rpm(path, value):
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24 return('%d rotations per minute' % value)
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25
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26 def main(argv):
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27 global dbusObjects
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28
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29 print(__file__ + " starting up")
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30
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31 # Have a mainloop, so we can send/receive asynchronous calls to and from dbus
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32 DBusGMainLoop(set_as_default=True)
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33
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34 # Put ourselves on to the dbus
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35 dbusservice = VeDbusService('com.victronenergy.example')
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36
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37 # Most simple and short way to add an object with an initial value of 5.
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38 dbusservice.add_path('/Position', value=5)
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39
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40 # Most advanced wayt to add a path
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41 dbusservice.add_path('/RPM', value=100, description='RPM setpoint', writeable=True,
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42 onchangecallback=validate_new_value, gettextcallback=get_text_for_rpm)
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43
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44 # You can access the paths as if the dbusservice is a dictionary
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45 print('/Position value is %s' % dbusservice['/Position'])
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46
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47 # Same for changing it
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48 dbusservice['/Position'] = 10
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49
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50 print('/Position value is now %s' % dbusservice['/Position'])
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51
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52 # To invalidate a value (see com.victronenergy.BusItem specs for definition of invalid), set to None
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53 dbusservice['/Position'] = None
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54
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55 dbusservice.add_path('/String', 'this is a string')
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56 dbusservice.add_path('/Int', 0)
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57 dbusservice.add_path('/NegativeInt', -10)
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58 dbusservice.add_path('/Float', 1.5)
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59
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60 print('try changing our RPM by executing the following command from a terminal\n')
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61 print('dbus-send --print-reply --dest=com.victronenergy.example /RPM com.victronenergy.BusItem.SetValue int32:1200')
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62 print('Reply will be <> 0 for values > 1000: not accepted. And reply will be 0 for values < 1000: accepted.')
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63 mainloop = GLib.MainLoop()
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64 mainloop.run()
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65
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66 main("")
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