KNX with multiple interfaces

[ReneBa79 (Rene)]

Hi,
i have an buildung with 3 knx busses, i search for configure multiple knx-Interfaces (tunneling) in the configuration yaml.

Thanks and Greetings
Rene

[farmio (Matthias Alphart)]

Hi! This is not possible.
Are these 3 busses not connected via line couplers or routers? Knx Routing would be supported.

[ReneBa79 (Rene)]

hi,
the busses have no connection,
no line couplers and routers, in the different busses are the same group adresses

[farmio (Matthias Alphart)]

Im afraid this is not going to work out of the box.
You can connect to 2 buses using the standard Knx integration and the xknx custom component (see xknx.io and GitHub). You could maybe take it and build your own eg “yknx” component from this to have a 3rd instance.
Changing the interfaces with routers and moving some GAs might be a nice alternative - depends on the installation and if it’s viable to have all 3 buses in 1 ETS project.

[Plesiohedron]

Hi Matthias,

You can connect to 2 buses using the standard Knx integration and the xknx custom component

Do you mean 2 concurrent KNX interfaces are supported in Home Assistant out of the box? I did not find how to set up such a configuration.

I plan to install a second dedicated knx bus for outdoor use. For security reasons. Although unlikely, I don’t want anyone to be able to open my doors by connecting to an outdoor EIB cable.

A more expensive alternative is using a line coupler and filter tables (needs additionally a dedicated power supply, so 2 pieces of HW).

thanks.
Marc

[Plesiohedron]

You have answered this already

How to use two or more IP-Interfaces?

Hello! I’m new to Home Assistant an I have a KNX-Installation at home. I have one KNX Interface in the Main-Building and another one for the garden. These Interfaces are both IP-Interfaces, which are in the same subnet. Unfortunately I can add only one of these to the configuration.yaml. Is it possible to add another one? I couldn’t find any help in the documentation. Thank you. -Andreas

[farmio (Matthias Alphart)]

Hi!
You need 2 power supplies anyway (or you could use one and an additional choke). A used line coupler costs about 40€. I’d go for this as you can control your outdoor things from indoor natively in knx instead of going over eg. HA and have everything in one ETS project.
Im not sure if the intrusion vector is any better/different with a line coupler or HA as line coupler.
2 knx installations in HA is not recommended, it’s just a hack that could theoretically work - or break in future updates.

[compies]

Openhab supports multiple knx Bridges. You can setup the Bridges in Openhab and use the Openhab integration to communicate with the second bridge. I use that to get the states of 2 Binary knx input counters which are at a different location.