Creating a Thing definition

A  thing definition models the attributes, alarms, properties, methods, tunnels, presentation information, and other characteristics of a particular type of item that is a portion of your IoT solution.  To define a thing definition, do the following:

1. From the  Developer main screen in the  THINGS group, click  Thing definitions.
   The  Thing definitions screen appears.
   
2. Click the  New thing definition button
   
   The  Adding thing definition page appears.
   
3. Enter the following fields to create a new Thing definition:
   

   S.No.	Field	Description
   1	Key	The key for the thing definition. For more information on key formats and limitations, see Field Formats and Limitations
   2	Name	The name of the thing definition
   3	Auto def attributes	Allows the thing to auto define its attributes
   4	Auto def properties	Allows the thing to auto define its properties
   5	Allow ad-hoc tunnels	Allows the thing to connect to ad-hoc tunnels

4. Define the characteristics of the thing definition using the following characteristic tabs

   Parameters	Description
   Attributes	Attributes are simple key value string pairs for storing meta-data for a thing. For example, The VIN on a car, a serial number of a piece of equipment, a customer name, and so on.
   Alarms	Alarms are implemented as a state machine, where the events are defined as alarm states. For example: For a thing that represents a tank, defining an alarm for low level. For a thing that represents an engine, defining an alarm for whether the engine is on or off. Things can have multiple alarms. Each alarm can have multiple states. Alarms are graphed since they have a state and timestamp component.
   Properties	Properties are used to store historical data for a thing, at a specific timestamp. The data could be anything, it is stored as a floating point value with the "real" value, as well as aggregations at 1 hour and 1 day for averages, minimum, and maximum values. Properties are graphed since they have a value and timestamp component.
   Methods	Methods define the interface to functions that are implemented in a gateway trigger (using  TR50 Method trigger event type) or are implemented in an application. The "calling" of a thing's method can be from a gateway trigger, from an application, from the thing's page in the Management Portal, or from a cloud trigger within the IoT Portal.
   Tunnels	Tunnels support a client application to connect to a server application on a gateway, using the IoT Portal as the communication mechanism.
   Locations	Locations are used to define how things that have this thing definition respond to location information.
   Firmware	Firmware tab is used to define the Firmware.

5. Click Add.

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