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Dynamically change the Data Change Type

nadams1
3-Visitor

Dynamically change the Data Change Type

I have a situation where I ordinarily only want to log a data change when there is a change greater than a particular value. But I have a requirement that I capture data more frequently and accurately when triggered into that mode. Is it possible to change the Data Change Type / Threshold via a service from the platform? can it be done on the edge?

2 REPLIES 2
nkhose
1-Newbie
(To:nadams1)

If you have a subcription on any property Datachange Event this can be done to log the data change on that specific property  , you can get the new

data for that property as var newValue = eventData.newValue;

Old value as var oldValue = eventData.oldValue;

you can check something like

if (newValue > someVal)

{

// log the values here you can call any service Things['logdata'].Triggerlog()

}

If you have not and subcription on property Add Subcription on that property and select event as DataChange

Hope this helps

supandey
19-Tanzanite
(To:nadams1)

Hi, just extending on what Nilesh mentioned you can also do this from the Edge device for this you will need to address the Aspect ​ for that property, e.g.

//Create the property definition with name, description, and baseType
PropertyDefinition property1 = new PropertyDefinition(
  "Property1",
  "Description for Property1",
  BaseTypes.BOOLEAN);

//Create an aspect collection to hold all of the different aspects
AspectCollection aspects = new AspectCollection();

//Add the dataChangeType aspect
aspects.put(Aspects.ASPECT_DATACHANGETYPE,
new StringPrimitive(DataChangeType.NEVER.name()));

//Add the dataChangeThreshold aspect
aspects.put(Aspects.ASPECT_DATACHANGETHRESHOLD, new NumberPrimitive(0.0));


//Set the aspects of the property definition


//Add the property definition to the VirtualThing

For more have a look at the Edge Help Center > Aspects of Properties

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