KNX Switch/light custom payload data

Third party integrations
1

Hi
I have an old KNX system with a tebis ts. I found out that i can switch off lights by adding a switch or a light but not turn on. In order to turn on i need to send payload [2, 12, 22, 32].


It works if i use the knx.send service then i can send it as an array, Is it possible to configure a switch or a light to send custom data for on/off. It only sends 0 or 1 now,
1 Like
2

This is really odd. How is this turned on by your knx wall switches?

You could create an HA automation that listens to the switch and triggers knx.send

3

yes by wall switches.
Automation How? Can you intercept the outgoing event and change the payload?
I tried to make a template switch to call knx.send. But the template switch resets to onto off by auto because it needs value_template. How can i make a switch that just calls knx.send and pass adress and payload. Input boolean? Or can i just change the default payload for the knx switch in som file?

switch:
  - platform: template
    switches:
      skylight:
        value_template: "{{ is_state('lights_living', 'on') }}"
        turn_on:
          service: knx.send
          data:
            address: "1/0/11"
            payload: [2, 12, 22, 32]
        turn_off:

          service: knx.send
          data:
            address: "1/0/11"
            payload: [0, 10, 20, 30]
4

I’d look into making 2 scripts, one to turn off and another to turn on.

5

Ive managed to create an automation, but it is possible to load the adress dynamicly from the light. Otherwise i have to create one automation per light

id: ‘1566215459582’
alias: knx
trigger:

  • entity_id: light.knx_light
    from: ‘off’
    platform: state
    to: ‘on’
    condition: []
    action:
  • data:
    address: 1/0/11 //can this be dynamic?
    payload:
    • 2
    • 12
    • 22
    • 32
      service: knx.send
  • id: ‘1566215459582’
    alias: knx
    trigger:
    • entity_id: light.knx_light
      from: ‘on’
      platform: state
      to: ‘off’
      condition: []
      action:
    • data:
      address: 1/0/11 //can this be dynamic?
      payload:
      • 0
      • 10
      • 20
      • 30
        service: knx.send
        –
6

If you want to edit the knx implementation (eg. of light) for your needs:
Clone xknx and use it as a custom component
Replace the switch class in the light device with RemoteValueSensor with value_type ‘DPT-12’


and edit set_on() and set_off() to await self.switch.set(YourValueAsIntegerHere) and edit state().

7

Thanks, i think this is the way forward. Sorry but I dont quite follow, im new to this.
Should these be like this

async def set_on(self):
      """Switch light on."""
    await self.switch.set([2, 12, 22, 32])

  async def set_off(self):
      """Switch light off."""
      await self.switch.set([0, 10, 20, 30])

Can they be Arrays, you wrote integer?

Replace

self.switch = RemoteValueSwitch(
          xknx,
          group_address_switch,
          group_address_switch_state,
          device_name=self.name,
          after_update_cb=self.after_update)

with this?

 RemoteValueSensor="DPT-12"

What about state()?

8

Yes Int. DPT-12 will convert the raw bytes to int and vice versa - see xknx.knx.DPT4ByteUnsigned
[2, 12, 22, 32] -> 34742834
[0, 10, 20, 30] -> 1056816

The state will always be true because Python will evaluate eighter value as True -> bool(1056816) == True
so replace this with something like

if self.switch.value == 34742834: 
    return True
return False
9

thank you, i am probably slow but.
Should i remove this

self.switch = RemoteValueSwitch(
          xknx,
          group_address_switch,
          group_address_switch_state,
          device_name=self.name,
          after_update_cb=self.after_update)

and use this

 RemoteValueSensor="DPT-12"

async def set_on(self):
      """Switch light on."""
    await self.switch.set(34742834)

  async def set_off(self):
      """Switch light off."""
      await self.switch.set(1056816) 

  if self.switch.value == 34742834: 
    return True
return False
10

no this won’t work.

self.switch = RemoteValueSensor(
          xknx,
          group_address_switch,
          group_address_switch_state,
          sync_state=True,
          value_type="DPT-12",
          device_name=self.name,
          after_update_cb=self.after_update)

The if statement goes in the state function instead of return bool(self.switch.value)

1 Like
11

Thanks, now it works :slight_smile:
It is not updating the state of the light if i press the wall switch, i can se the knx event but i guess i have to live with that

12

I get an error when i use the wall switch. It seems like its trying to parse the message but fail i guess because the message is not standard knx. Do you know how to change so it can parse?

"2019-08-20 09:58:37 ERROR (MainThread) [xknx.log] Error while processing telegram <CouldNotParseTelegram description="payload invalid" device_name="Kontor höger taklampa" group_address="1/0/12" payload="<DPTArray value="[0x10]" />"/>"
13

Ive managed to create an automation, but it is possible to load the adress dynamicly from the light. Otherwise i have to create one automation per light

If you use scripts instead of automations you are able to pass on the address of a light as as variable :slight_smile:

14

How can I send data more than 6 bits (so, list) through template?
this doesn’t work, says it expected int

      data_template:
        address: "2/0/{{ trigger.to_state.name[-2:] }}"
        payload: "{{ [trigger.to_state.state | int] }}"
1 Like