Player Item connected to MQTT

Setup, Configuration and Use Beginners
1

Running OH 4.1.3 on a RPi4

All configuration done using Main UI.

I’m trying to connect a Player item to and MQTT channel.

I configured the channel as a text channel with a command topic.

Here is the channel code

  • id: BrianRemote
    channelTypeUID: mqtt:string
    label: Brian Remote
    description: “”
    configuration:
    qos: 1
    commandTopic: brian/remote
    postCommand: true

The Item sends a command to the Thing but I don’t see any MQTT messages being sent

2

Did you set the mqtt bridge?

3

yes I have a working bridge handling lots of other topics

I’m trying to send to another topic called remote on this player

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4

It’s difficult to figure this out without more details.

  • Try setting postCommand to false (a long shot, I’m not too familiar with this. It should have nothing to do with sending a command from item → thing. It’s for the other way around.)
  • Show us your full thing definition
  • Show us the item that is linked to this channel
5

Thanks for the quick response!
I realize my details were sketchy but I was looking for some guidance that it should work or is not not supported.

I’m going to try creating a new Thing instead of just adding a channel to a Thing I created a long time ago.

6

I did some tests. It seems that a String mqtt channel won’t accept PlayPauseType as a command.

So as a “trick”, you can add a profile in your player item to channel link. This one would work: profile="transform:DSL", commandFromItemScript="|input"

That converts the PlayPause command to a String which the mqtt will accept.

We should probably relax the requirement for the string channel so it could receive stuff like this though.

7

added that profile to the channel

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Got an error in the events log

09:30:35.282 [ERROR] [n.module.script.profile.ScriptProfile] - Failed to process script ‘profile=“transform:DSL”, commandFromItemScript=“|input”’: Could not get script for UID ‘profile=“transform:DSL”, commandFromItemScript=“|input”’.

8

In the “itemtothingtransformation” option, you’d just type |input. I’m not sure if this works in openhab 4.1 but give it a try

9

yup, that worked!

10

Even though I’m sending commands my player does not respond.
Here is a screenshot from MQTT Explorer.

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Apparently the commands need to to formatted as lower case with quotes, such as “play”

So I need to transform them in some way. Can that be done in the channel?

11

|input.toLowerCase

12

that did it!
Thanks again!

13

So this is working for the Play command.

The player item sends a Next command but my device needs a nextitem command. Can that be done?

14

Maybe use map transform instead of dsl.

15

thanks, I’ll give that a try