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Adding Dynamic channels to a thing type [message #1710480]

Wed, 07 October 2015 06:03

Jayaraj Esvar

Messages: 3
Registered: July 2015

Junior Member

Hi,
I would like to add channels to my existing thing type, Where my set of channels will vary for each thing that is created.

For example if I have a thing type.xml without any channels defined

<?xml version="1.0" encoding="UTF-8"?>
<thing:thing-descriptions bindingId="elnetty"
xmlns:xsi=...........>


<thing-type id="alljoyn">
<label>AlljoynThing</label>
<description>An Alljoyn Device</description>

</thing-type>

</thing:thing-descriptions>

and channel types defined on seperate xml like

<?xml version="1.0" encoding="UTF-8"?>
<thing:thing-descriptions bindingId="elnetty"
............>


<channel-type id="Alarm">
<item-type>Switch</item-type>
<label>Alarm</label>
<description>Alarm.</description>
<category>Alarm</category>
</channel-type>

</thing:thing-descriptions>

Is it possible to add channels dynamically to a thing type While creating it.

public Thing createThing(ThingTypeUID thingTypeUID, Configuration configuration, ThingUID thingUID,
ThingUID bridgeUID) {

List<Channel> channels = new CopyOnWriteArrayList<>();
ChannelUID channelUID = new ChannelUID("elnetty:alljoyn:" + getDeviceId()
+ ":" + id);
Channel channel = ChannelBuilder.create(channelUID, type).build();

channels.add(channel);

return ThingBuilder.create(thingUID).withChannels(channels) .withProperties(getThingTypeByUID(thingTypeUID).getProperties()).build();
}

or how do i register these channels types to channelprovider. The set channels will vary for each instance of the the thing.

here the variable "id" is not known before so i can't add them to thing type like

<channels>
<channel id="0" typeId="Alarm" />
<channels>

Right now In class ThingSetupManager , addThing()
this.thingTypeRegistry.getChannelType(channel.getUID()); is not getting populated without definitions of channels for Thing-Type in XML file

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Re: Adding Dynamic channels to a thing type [message #1711365 is a reply to message #1710480]

Thu, 15 October 2015 11:22

Kai Kreuzer

Messages: 673
Registered: December 2011

Senior Member

Quote:

I would like to add channels to my existing thing type, Where my set of channels will vary for each thing that is created.

If it varies for each thing, you should not add them to the thing type. Simply only define the channels that are available on ALL things of this type. Then when creating the thing within the ThingHandlerFactory, add the according channels to the thing that you need.
Channel types can be declared by either XML files in ESH-INF or by implementing your own ChannelTypeProvider.

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