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System channels - standardising the UI [message #1702857]

Sun, 26 July 2015 11:49

Chris Jackson

Messages: 256
Registered: December 2013

Senior Member

Following on from the discussion about the battery system channel, I had expected that the system channel would be usable in a standard way by the UI. For example, by defining the "system.battery-level" channel, I expected that in the UI I would be able to detect all battery-level channels/items from all bindings, and display them consistently rather than having to know the different naming conventions that different binding have used.......

However, that doesn't seem to be the case. The channelType is not available to the UI - only the channelId is available. This means that in reality there is no standardisation from the UI perspective, which seems a shame. I could use the category (Battery) to provide this, but that's a very broad brush...

In my way of thinking, system channels are there so that they can be treated consistently throughout the system, but without some way of passing this to the UI, it seems quite limited?

Have I missed something somewhere? How is this intended to be used?

Chris

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Re: System channels - standardising the UI [message #1703045 is a reply to message #1702857]

Tue, 28 July 2015 09:06

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

Very true what you are saying - there indeed seems to be something missing to make the system channels useful.
Two thoughts about this:
1. The channel types might become available through the /rest/things endpoint by introducing the ChannelTypeRegistry
2. On the item level, maybe the system channels would be a good start for an ESH tag library, E.g. a system channel could add the default tag "esh:battery-level" to linked items, so that you can easily query for all items, which have this meaning.

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Re: System channels - standardising the UI [message #1706441 is a reply to message #1703045]

Wed, 26 August 2015 20:18

Dennis Nobel

Messages: 166
Registered: September 2014

Senior Member

Quote:

However, that doesn't seem to be the case. The channelType is not available to the UI - only the channelId is available

Quote:

1. The channel types might become available through the /rest/things endpoint by introducing the ChannelTypeRegistry

I think we just have to extend the ChannelDefinitionDTO with either a typeUID or refactor the model to also have a ChannelTypeDTO.

Quote:

2. On the item level, maybe the system channels would be a good start for an ESH tag library, E.g. a system channel could add the default tag "esh:battery-level" to linked items, so that you can easily query for all items, which have this meaning

Yes, this would help to also have the information in the item domain.

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