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IoT/M2MIWG/M2M meta-model

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Draft Content
This page is currently under construction. Community members are encouraged to maintain the page, and make sure the information is accurate.


Terminology

  • ACL: Access Control List. List of permissions attached to an object, specifying which entity of a system is granted access to it.
  • Software package: A binary file containing software and metadata that can be sent to an M2M device to update one of its software components

General purpose of an M2M application meta-model

Functional requirements

  • The M2M application meta-model MUST allow the description of the different parts an M2M application is made of.
    • It MUST allow the description of the data that can be exchanged between a device and a server.
    • It MUST allow the description of the device management capabilities provided by an M2M application.
    • It MUST allow the description of the different components an M2M application is made of.

Data Management

  • The M2M application meta-model SHOULD allow to structure data elements hierarchically.
  • The M2M application meta-model MUST allow to associate a type to data elements.
  • The M2M application meta-model MUST support the following primitive types: string, integer, double, date, boolean, byte array.
  • The M2M application meta-model SHOULD allow to define constraints for the data, such as: range, max length, ...
  • The M2M application meta-model SHOULD allow to indicate the protocol to use when exchanging a given data element.
  • The M2M application meta-model SHOULD allow to associate configuration parameters to protocols
  • The M2M application meta-model SHOULD allow to associate an history policy (keep all, keep last, keep on change...) to a data element.
  • The M2M application meta-model SHOULD allow to associate ACLs to data elements.
  • The M2M application meta-model SHOULD allow to specify commands that can be sent by a server to a device.
  • The M2M application meta-model SHOULD allow to specify events that can be sent by a device to a server.

Device Management

  • The M2M application meta-model MUST allow the description of the Device Management operations supported by a given system.
  • The M2M application meta-model SHOULD allow to indicate the binary files the application is made of.

Application Lifecyle Management

  • The M2M application meta-model SHOULD allow to specify which application container is managing an application
  • The M2M application meta-model SHOULD allow to specify dependencies towards capabilities of the underlying device the application is to be deployed on.
  • The M2M application meta-model SHOULD allow to validate a software package


Non-functional requirements

  • It MUST be possible to edit an M2M model instance using a standard text editor.
  • It SHOULD be possible to provide graphical visualization of an M2M model instance.
  • It SHOULD be possible to split an M2M model instance into several pieces to ease maintenance and reuse.


Work in Progress

'Things' model

The model of what Things a system is made of, what are the data hold/manipulated by these Things, and what kind of actions can be performed on these things is currently being defined.

Main model

Things diagram.png

Type system

Things types diagram.png