Pre-requisite

• Please read the previous post regarding how to receive notifications via SensorThings MQTT

Subscribe to the Things

It is very easy to receive a notification when a Thing has been added to a SensorThings.  Simply subscribe to the following topic, and then you can receive messages whenever a Thing joined the SensorThings service:

• v1.0/Things

See here for the example code

• http://jsfiddle.net/1cj4s0jh/2/

But in order to receive a message for new Things, you will need to add a new Thing.  Please use our SensorThings dashboard (http://ogcpilot.sensorup.com/admin/#/things) to add a new Thing. 

• Click Create

• For now, just enter any text in the Description.

• And you will see the Thing created in the dashboard

• At the same time, you should receive a message pushed to you (see below)

Note that, the only difference between this sample code to the previous one that subscribes to new Observations, is the topic.  When you subscribe v1.0/Datastreams(id)/Observations, you receive new Observations.  When you subscribe to v1.0/Things, you receive new Things.  I guess it makes sense, eh?

BTW, the above Thing subscription will not only receive notifications regarding a new Thing joining, but also an existing Thing leaving.