Linux DBus remote control of Cerbo GX

Question

question

ivan asked Aug 18, '20

Linux DBus remote control of Cerbo GX

Hi,

I'm trying to connect to Cerbo GX via the DBus (on Linux) so I could set the ESS -> Scheduled Charging. Idea is to make an automatic schedule maker, depending on the time's list I receive daily.

Is it possible? Maybe there is a guide or any examples with something that could be useful?

When I try to use velib_python example files from the tutorial(https://github.com/victronenergy/velib_python ) I'm stuck on the second step (creating a second dbus session in a new cmd window with "dbus" or "dbus -y" commands) - the reply is "command not found".

I've never worked with DBus before, so if this question is silly please don't blame.

Thank you!

Ivan

Venus OS linux

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2020-08-19T21:09:13Z

Ole Saether answered · Aug 19, 2020 at 09:09 PM

The example you referred to is meant to be executed on your local machine.
I don't think you can control Venus remotely via the Dbus. I would recomment either using Modbus or MQTT. That is what I do. I have shared a couple of examples here:
https://github.com/osaether/code-snippets/tree/master/victronenergy/modbus
https://github.com/osaether/code-snippets/tree/master/victronenergy/mqtt

4

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

ivan commented · Aug 21, 2020 at 08:23 AM

Thank you, osaether!

I'll try Modbus and MQTT.

Do I understand correctly - I can connect to my Venus via the internet if I'm not connected to the same network?

Have you figured out how to set up the schedule via MQTT (https://community.victronenergy.com/questions/44144/activateset-schduled-charging-via-modbus.html )?

Where can I find these links with ID's of my devices:

N/*/system/0/Relay/0/State
N/*/system/0/Control/ScheduledCharge,0
etc

0 ·

Ole Saether ivan commented · Aug 21, 2020 at 10:21 AM

Yes, you can connect to your Venus over the Internet. For Modbus you need to add port-forwarding to port 502 (default Modbus port) in the router that connects your Venus to the Internet. For MQTT you don't need any port-forwarding.

For MQTT the ID's of your device is the VRM portal ID. You can find it under Settings->VRM online portal in the remote console and under Settings->General on the VRM portal.

The MQTT paths after the "N/*" are the same as the d-bus paths. Check the Venus D-bus documentation for more info.

0 ·

ivan Ole Saether commented · Aug 21, 2020 at 10:24 AM

I can only get a response from N/*/system/0/Serial

Other paths don't work. Where can be a problem?

0 ·

Ole Saether ivan commented · Aug 21, 2020 at 10:45 AM

Yes, this is a common new user error. Please search for "MQTT serial" on this forum. Here is a start:
https://community.victronenergy.com/questions/6553/mqtt-only-see-system0serial.html

0 ·

question