|Re: list of channels [message #1746925 is a reply to message #1746878]
||Mon, 07 November 2016 17:58
| Bernhard Boser
Registered: November 2016
Many thanks for the quick response. It's incredible how you manage to personally respond to these questions.
Kai Kreuzer wrote on Mon, 07 November 2016 08:30
The channelLinked() method is the right place to be informed about newly linked channels - it definitely is called by the framework!
This method is never called in my OH2 binding (the IDE marks it correctly as overloaded).
The full list of channels that are defined on the Thing (independent of whether they are coming through the thing type definition or through a user configuration) is available through "getThing().getChannels()".
"getThing().getChannels().size()" is always zero, no matter when I call it (I've even added a special "switch" that let's me call it from the gui).
But the links are definitely created. In the log, just after startup, I first see the links (from my items file), e.g.
09:34:23.297 [INFO ] [home.event.ItemChannelLinkAddedEvent] - Link 'doorStairs-nx584:security:creston:zone18#status' has been added.
and a bit later the thing (from my thing file):
09:34:28.919 [INFO ] [smarthome.event.ThingAddedEvent ] - Thing 'nx584:security:creston' has been added.
The binding sends updates to these links (or channels, are they the same?) and the sitemap is updated as expected.
I did not define the channels in the thing_types.xml file, just in the items file.
Regarding channel parameters, you need to note that those are configured in the Thing definition, e.g. within the *.things files. The *.items file that you refer to above only hold a reference to a channel, but no further details. You might also want to read http://docs.openhab.org/tutorials/migration#understanding-things to better understand this change from OH1 syntax to OH2 syntax.
I've read the tutorial and though it does make sense for the weather binding, I to see how to best deal with the following case: The ISY binding (currently unresolved PR, OH1) identifies lights with 2 addresses (has to do with Insteon - I can go into details). Per the tutorial, these should be parameters and specified in the .things file. Since each address combination represents a single light (precisely, scene), there is now a 1-to-1 correspondence between things and items! While possible, this would add significant redundancy to the user configuration.
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