Problems with multiple DBus instances in single app since e venus OS 2.80

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mfriedel asked Jan 11, '22

Problems with multiple DBus instances in single app since e venus OS 2.80

Background.

I have driver that uses a shared connection for multiple devices.

It is one driver instance with the connection that registers multiple devices/services.

It has been working fine in 2.7x.

The code is in python, and when I instantiate the Service I use the private=True to force separate instances of the bus connection.

self._dbusconn = bus or (dbus.SessionBus() if 'DBUS_SESSION_BUS_ADDRESS' in os.environ else dbus.SystemBus(private=True))

If I have 1 instance this works fine, it also works for 2.. but for 3 or more it creates some interesting problems.

Updates to the bus still work, but all other paths disappear on the bus.

So for example

/Mgmt/Connection

disappears

/State

and others I update stick around.

Not sure where the problem lies yet. Could be the python bindings to the dbus library (changes for switch to python3).

Any ideas are welcome

Venus OS

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Modifications Space

Node Red Space

Answer 1 · 2022-01-12T09:31:49Z

bathnm answered · Jan 12, 2022 at 09:31 AM

You might want too take a look at your code and the latest velib_python. There has been a change to the way things work. They have moved from a model referred to as dictupdates to a new model called ItemsChanged. I do not know if this change is impacting your code.

Maybe take a look at a few of the Victron python services to check, and a close look at release notes or beta release notifications within the forums.

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Answer 2 · 2023-01-10T23:03:17Z

henne answered · Jan 10, 2023 at 11:03 PM

I also want to create multiple instances, could you share your code how to create multiple ? I have seen your previous post on the problem, but I'm not sure where to put the Private=True element? Also have you been able to fix it in 2.80? Thank you

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bathnm commented · Jan 11, 2023 at 11:53 AM

@henne you might want too check out this dBus-API wiki page. Specifically the section on VRM Device Instance.

0 ·

Answer 3 · 2023-01-11T10:57:03Z

henne answered · Jan 11, 2023 at 10:57 AM

I got this working now

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