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Changing of channels state and options on build, how? [message #1752569]

Wed, 25 January 2017 08:44

Markus Eckhardt

Messages: 2
Registered: January 2017

Junior Member

hi,

I have a question about the creating/modifying of channels in OH2.
I get from the device a kind of channels. This channels have capabilities like min/max for float or only usable string options.
In ESH this states min/max and options are set in the channels xml file but I cannot use it. This limitations are dynamic and known only after the initialisation of the bridge. How can I modify a channel and add state limits (min/max and options) after the thing is created or in thing/channel creation time?

https://www.eclipse.org/smarthome/documentation/development/bindings/thing-definition.html#state-description

Markus

[Updated on: Wed, 25 January 2017 18:56]

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Re: Changing of channels state and options on build, how? [message #1753348 is a reply to message #1752569]

Sat, 04 February 2017 10:01

Markus Rathgeb

Messages: 101
Registered: August 2014

Senior Member

Good question.
The min and max option are currently declared on the channel type and so can't be changed by the channel instance.
You could create a custom channel type (programmatically) all the time you needs other min and max, but I don't think this is the best option.
@kaikreuzer If the min / max is not defined by the type but by a special channel instance, should this channel use a configuration option so a custom UI could react on or should we provide a solution by the framework?

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Re: Changing of channels state and options on build, how? [message #1754122 is a reply to message #1753348]

Tue, 14 February 2017 15:56

Kai Kreuzer

Messages: 657
Registered: December 2011

Senior Member

This information is indeed on the channel type only. It is retrieved by the ChannelStateDescriptionProvider in getStateDescription(). We could think about introducing a new interface, which bindings could implement, that would then be asked for specific channel information; a bit similar to the ConfigOptionProvider that we put in place for individual config options.

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