[SOLVED] MQTT: Publishing of "false/true" for switch channel doesn't work

Setup, Configuration and Use Beginners
1
  • Platform information:
    • openHAB version: 2.4.0 (release)

I set up a MQTT switch channel like this:

Thing mqtt:topic:myTopic (mqtt:broker:mybroker) {
    Channels:
        Type switch : myDebugSwitch [
            stateTopic="my/device/node/attribute",
            transformationPattern="MAP:on_true.map",
            transformationPatternOut="MAP:on_true.map",
            commandTopic="my/device/node/attribute/set",
            postCommand=true
        ]
}

with on_true.map being like this:

true=ON
false=OFF

and an item being like this:

Switch myDebugSwitch_Status "Debug Switch [%s]" <switch> { channel="mqtt:topic:myTopic:myDebugSwitch" }

So receiving a MQTT update my/device/node/attribute true successfully changes my switch, so that’s great.

Sadly it doesn’t work the other way round, when I change the switch to off, I get this log:

[WARN ] [rm.AbstractFileTransformationService] - Could not transform '0' with the file 'on_true.map' : Target value not found in map for '0'
[WARN ] [eneric.internal.generic.ChannelState] - Command '' not supported by type 'OnOffValue': No enum constant org.eclipse.smarthome.core.library.types.OnOffType.

and OpenHAB publishes my/device/node/attribute/set 0 - so a zero instead of false.

So I edit my on_true.map to be like this:

true=ON
false=OFF
1=true
0=false

which only changes the error message to

[WARN ] [eneric.internal.generic.ChannelState] - Command 'false' not supported by type 'OnOffValue': No enum constant org.eclipse.smarthome.core.library.types.OnOffType.false

but OpenHAB still publishes my/device/node/attribute/set 0 - which doesn’t cause the switch to switch, because it expects a false there

So what am I doing wrong?

2

There should be an option to set the on and off value

           Type switch : unreach       "Unreach"           [ stateTopic="tele/GF_KI_WindowsillLight/LWT", on="Offline", off="Online"    ]

I use it to signal an unreach state

3

Wouldn’t you want

true=ON
false=OFF
ON=true
OFF=false

But I think you have to be 2.5m1 at least.to get transformationPatternOut feature

4

Sorry no, that doesn’t change the published message.

5

No, that produces the first error message that 0 can’t be transformed :frowning:

6

I understand that formatBeforePublish is applied before the transform, so you might need that as %s to convert OnOffType to “ON”

7

There is your problem…

8

Ah okay, that’s what he meant with that cryptic abbrevation ^^
I just read documentation at https://www.openhab.org/addons/bindings/mqtt.generic/#channel-configuration and it’s mentioned there. I supposed that documentation fits latest released version, but obviously that’s not the case here…

9

That currently doesn’t change the output, but it makes the error message in log go away, thanks!

10

Confusingly, it’s ahead of the game. There is a version dropdown at top right but it defaults to “latest” instead of “standard release”