A RESTful and Decentralised Implementation of Open Objects Dice Lab, Royal Holloway University of London Paulo Ricca, Kostas Stathis paper: http://www.webofthings.org/wot/2013/papers/wot3-ricca.pdf

1. The Open Object
DICE Lab
Royal Holloway University of London
Paulo Ricca Kostas Stathis

2. Smarter
Objects…

3. …But Still
Electronically Closed

4. We envision a world of collaborative Open
Objects supported by End-User Development

5. Structure
Framework
Implementation
Scenario and Case-Study
Conclusions

6. Framework

7. FUNCTIONALITY
+

8. Event Event

9. Event Event

10. Event

13. Actuators
Sensors

14. Actuators
Sensors
C2 Cn…C1

15. Actuators
Sensors
C2 Cn…C1
E1

16. Actuators
Sensors
C2 Cn…C1
BnB1
E1

17. Behaviour Definition

18. Rule Definition

19. Implementation

20. Meta-Workflow

21. A Complete Open Object
Event Listener
Rule Execution
Rule Storage
Behaviour Managing
Behaviour Advertising
Thin Web Client
Thin Web Server
Other Behaviours
Open Object

22. An Incomplete Open Object
Event Listener
Rule Execution
Rule Storage
Behaviour Managing
Behaviour Advertising
Thin Web Client
Thin Web Server
Other Behaviours
Open Obje
Event Listen
Rule Execut
Rule Stora
Behaviour Man
Behaviour Adve
Thin Web Cl
Thin Web Se
Other Behavi
pen Object
ent Listener
e Execution
ule Storage
iour Managing
our Advertising
n Web Client
n Web Server
er Behaviours
Open Object

23. Scenario and Case-
Study

26. Door Sign

27. Door Sign
Door Sign Behaviours
Behaviour Advertising
Thin Web Client
Thin Web Server
Message Displayer
Traffic Light

28. Availability Cube

29. Availability Cube
Cube Behaviours
Behaviour Advertising
Thin Web Client
Thin Web Server
Orientation Sensing

30. Example Rules
{ rule:
{ when: check_calendar,
do:
[
{
request: calendarchecking get_state,
calendar: `https://calendar.google.com/…..',
date_time: { request: timekeeping now }
}
]
}
}

31. Example Rules{ rule: {
when: check_availability,
do: {
request: flowcontrol choose,
value: { request: orientationsensing get,
on_fail: { request: eventlistener display_availability_from_calendar }
},
options:
[
{ value: 1,
do:
[
{ request: messagedisplayer display,
message: "Out for Lunch” },
{ request: trafficlight set, colour: red },
] }, ……

32. Conclusions
A framework definition;
An implementation supporting distributed and
decentralised choreography of Open Objects;
A real-world experimental case-study, based
on web standards and embedded
implementation.

33. Thank you!
Questions? Ideas?

34. Json Behaviour Definition
{
`name': NAME,
`description': DESCRIPTION,
`capabilities':
[
{
`name': NAME,
`description': DESCRIPTION,
`parameters':
[
{
`name': NAME,
`type': TYPE,
`description': DESCRIPTION,
`optional': `True' | `False'
}
]
}
],
`events':
[
{
`name': NAME,
`description': DESCRIPTION
}
],
`characteristics':
[
{
`name': NAME,
`description': DESCRIPTION,
`unit': UNIT_OF_MEASUREMENT
}
]
}

35. Json Rule Definition
{
rule:
{
rule_id: ID,
cardinality:
{
PURPOSE:
{
behaviour: BEHAVIOUR,
minimum: MIN_NUMBER,
assignment: {}
}
},
when: PURPOSE EVENT,
do:
[
{
request: PURPOSE CAPABILITY,
external: URI,
ARGUMENT_NAME: ARGUMENT_VALUE OR REQUEST,
execution: “bottom-up” OR “top-down”,
on_error: {},
on_unauthorised: {},
on_unavailable: {}
}
],
on_error: {}
}
}