KNX: ButtonX does nothing if isn't any associated relay to it.

[ascillato2]

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Describe the bug A clear and concise description of what the bug is.

Originally posted by Sören in the Tasmota Chat:

I have a sonoff s20(target device) and a esp8266(testing device) with tasmota on it.

I want to use a Radarsensor (RCWL-0516) as a sensor that only send it state out through knx

I set up the Radarsensor to be button 2 und Said that button2 should send out on 6/1/20

That does not work

But it works when I have set up the Sensor as button1

Also, make sure these boxes are checked [x] before submitting your issue - Thank you!

• [x] Searched the problem in issues and in the wiki
• [x] Hardware used : sonoff s20
• [?] Development/Compiler/Upload tools used :
• [x] If a pre-compiled release or development binary was used, which one? : sonoff_knx
• [?] You have tried latest release or development binaries? :
• [ ] Provide the output of commandstatus 0 :

  
  STATUS 0 OUTPUT HERE - DO NOT DELETE THE MARKERS ABOVE AND BELOW THIS LINE

Not provided

**To Reproduce**
_Steps to reproduce the behavior:_

* Set button2 without a relay2
* Enable KNX
* Add any KNX address to button2
* Press button2 (nothing happens)

If relay is added or a rule is used, button2 can send KNX data

**Expected behavior**
_A clear and concise description of what you expected to happen._
ButtonX to be used in KNX without virtual relays

**Screenshots**
_If applicable, add screenshots to help explain your problem._
NA

**Additional context**
_Add any other context about the problem here._
NO

**(Please, remember to close the issue when the problem has been addressed)**

[ascillato2]

Tasmota does not support to use buttons without relays, so that is why it can't be added to the KNX Driver. Tasmota does support switches without relays.

As a workaround:

• Change in the module config (Tasmota WebUI) buttonX to switchX and set the switchmode as required.
• Set the KNX address you want to send the command in Tasmota WebUI (KNX menu) in any slot (ie KNX TX1)
• Then set the rule:

rule1 1
rule1 on switch2#state=1 do KnxTx_Cmnd1 1 endon