[MQTT] Update ReadMe

[JueBag]

Corrected Item syntax and added a note about the difference syntax when creating the things via PaperUI or files.

Signed-off-by: Juergen Baginski opus42@gmx.de

[JueBag]

Second try, same result :-(

Again, I'm out of clues what is wrong AND how to overcome!

[yozik04]

In my setup channel should be without broker. This is the only way it works.

mqtt:topic::

Switch Kitchen_Light "Kitchen Light" {channel="mqtt:topic:mything:lamp" }
Rollershutter shutter "Blind" {channel="mqtt:topic:mything:blind" }

[yozik04]

Bridge mqtt:broker:myUnsecureBroker [ host="192.168.0.42", secure=false ]
{
    Thing mqtt:topic:mything {
Channels:
        Type switch : lamp "Kitchen Lamp" [ stateTopic="lamp/enabled", commandTopic="lamp/enabled/set" ]
        Type switch : fancylamp "Fancy Lamp" [ stateTopic="fancy/lamp/state", commandTopic="fancy/lamp/command", on="i-am-on", off="i-am-off" ]
        Type string : alarmpanel "Alarm system" [ stateTopic="alarm/panel/state", commandTopic="alarm/panel/set", allowedStates="ARMED_HOME,ARMED_AWAY,UNARMED" ]
        Type color : lampcolor "Kitchen Lamp color" [ stateTopic="lamp/color", commandTopic="lamp/color/set", rgb=true ]
        Type dimmer : blind "Blind" [ stateTopic="blind/state", commandTopic="blind/set", min=0, max=5, step=1 ]
    }
}

And thing must be defined via: Thing mqtt:topic:mything

[yozik04]

But if you define Thing topic mything

Then Items will need include broker in channel: channel="mqtt:topic:myUnsecureBroker:mything:blind"

[JueBag]

@yozik04 : The question is which way to define the broker and device did you use. My findings were that you need to specify the broker in the channel definition, if both were created via file. However I only checked with things created by the Thing topic mything syntax, using Thing mqtt:topic:mything it worked as you describe!

I'm not sure anymore what to put into the readme!

[openhab-bot]

This pull request has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/channel-syntax-differences/60759/4

[JueBag]

The Readme seems to be updated otherwise. The discussion about the different ways to thing can be defined has to be discussed elsewhere. Closing this PR.