# Homey / KNX issue

**URL:** <https://community.homey.app/t/homey-knx-issue/52540>\
**Category:** Questions & Help\
**Created:** [October 2, 2021, 10:15am UTC](https://community.homey.app/t/homey-knx-issue/52540 "2021-10-02T10:15:44Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Lenn](https://avatars.discourse-cdn.com/v4/letter/l/a88e4f/32.png) [@Lenn](https://community.homey.app/u/Lenn)\
**Post date:** [November 19, 2021, 1:16pm UTC](https://community.homey.app/t/homey-knx-issue/52540/9 "2021-11-19T13:16:25Z")

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Hi Lars,

I don’t know if it can help you (or somebody else reading the post), but here is how it started to work for me  
(Still some work to have it really working, but I could already switch a light from a flow)

I got the groupadresses by “watching” the bus, and at first, I hadn’t understood that both groupadresses of the lights themselves and of the switches were mixed together.

For example, when switching one of the light with the wall switch, I had 1/0/4, 1/1/4, 1/2/4 and 1/3/4.  
So I have to figure each time which one is

- the light switch address
- the light status address
- the switch switch address (very clear 🙂 )
- the switch status address

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_[View the full topic](https://community.homey.app/t/homey-knx-issue/52540)._