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Multiple items, same channel [message #1725388]

Thu, 03 March 2016 08:46

Smart Home

Messages: 109
Registered: February 2015

Senior Member

Hi,

I want to create multiple items for a specific channel. The issue is that I need to have different configuration for each item. As far as I understand, you can have configuration in channel and not in item.

The options I see are:

1. Define in the thing type N channels from the same channel type. The problem is that I will be limited to N items.
2. Add channel dynamically each time I want to add new item. Is there an example how to create channel from channel type dynamically?
3. Use channel groups - I am not sure that this can solve my problem.

Is my understanding correct?

Thx

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Re: Multiple items, same channel [message #1725403 is a reply to message #1725388]

Thu, 03 March 2016 10:16

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

The forth option might be to have configurations on the links as suggested in https://github.com/eclipse/smarthome/issues/583 - I think this is the best, but this isn't yet implemented.

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Re: Multiple items, same channel [message #1725414 is a reply to message #1725403]

Thu, 03 March 2016 11:10

Smart Home

Messages: 109
Registered: February 2015

Senior Member

Yes, it seems that it is the better option. Hope it will be added soon.

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Re: Multiple items, same channel [message #1725415 is a reply to message #1725414]

Thu, 03 March 2016 11:19

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

Any help is appreciated - feel free to work on an according PR!

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Re: Multiple items, same channel [message #1725568 is a reply to message #1725388]

Fri, 04 March 2016 13:20

Marcel Verpaalen

Messages: 59
Registered: September 2014

Member

Smart Home wrote on Thu, 03 March 2016 09:46

Hi,
2. Add channel dynamically each time I want to add new item. Is there an

here an example incl channel config
see the newChannelfromTopic()

https://github.com/marcelrv/smarthome/blob/mqtt/extensions/binding/org.eclipse.smarthome.binding.mqtt/src/main/java/org/eclipse/smarthome/binding/mqtt/handler/MqttHandler.java#L371

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Re: Multiple items, same channel [message #1725569 is a reply to message #1725568]

Fri, 04 March 2016 13:22

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

Btw, Marcel, what is the status of your MQTT binding? Ready for a PR soon?

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Re: Multiple items, same channel [message #1725570 is a reply to message #1725569]

Fri, 04 March 2016 13:31

Marcel Verpaalen

Messages: 59
Registered: September 2014

Member

well, it more or less works, but until the UI's support custom channel enable, and channel config editing it is useless for the majority of users.

e.g. you can only enable channels via console commands, you can't change the configuration of the channel anymore once it is set etc.

For the rest it needs cleanup, removal of unused pieces etc.

So the main difference between the earlier provided code and mine is 4 fold:
1) It supports discovery of topic
2) It allows for 1 'Thing' with multiple mqtt topics mapped to channels
3) It allows you to set the output datatype per channel instead of creating 10 channels to account for each and every possible datatype
4) It weeds out all references to the legacy OH1 datatypes and compatibility layer

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