The document outlines a demonstration of Data Distribution Service (DDS) interoperability conducted by multiple vendors, showcasing various scenarios of data communication and quality of service (QoS) across different platforms. The demo emphasizes seamless discovery, data type compatibility, and effective communication techniques including filters and ownership policies, all without compromising performance. Conclusions highlight the commitment of vendors to enhance interoperability and confirm that DDS standards are now complete and usable.

1. dds/2013-03-01
DDS Interoperability Demo
March 2013
PrismTech Real-Time
Innovations
TwinOaks Object
Computing. Computing

2. Data-Centric Qos-Aware Pub-Sub Model
Virtual, decentralized global data space
Source
Speed Power Phase
(Key)
WPT1 37.4 122.0 -12.20
WPT2 10.7 74.0 -12.23
WPTN 50.2 150.07 -11.98

3. Data-Centric Communications Model
Data Domain Data Domain
New Writer Participant Reader Participant
“Alarm”
Got new “Alarm”
subscriber data
!
Offered Requested
Listener QoS Listener QoS
! Participants scope the global data space (domain)
! Topics define the data-objects (collections of subjects)
! DataWriters publish data on Topics
! DataReaders subscribe to data on Topics
! QoS Policies are used configure the system
! Listeners are used to notify the application of events

4. Who is participating?
PrismTech Real-Time
Innovations
TwinOaks Object
Computing. Computing
4

5. What you will see today
! #1 Interoperability works!
! #2 Multiple scenarios
 You will see interoperability along many dimensions:
 Discovery
 Different platforms (Linux, Windows)
 Not-trivial Data-Types with Keys
 Unicast & Multicast, both reliable and best efforts
 One to Many and Many to one communications
 Different Topics
 Different Qos: RELIABILITY, OWNERSHIP, DURABILITY
 Filters: time, content, …
! #3 Interoperability does not compromise performance
 Direct communication. No bridges!!
5

6. Interoperability between the applications
implemented by six different vendors
(March 2012)
OCI ETRI PrismTech IBM RTI TwinOaks
6

7. Interoperability demo at London IOA, October 2012
Four vendors participated:
PrismTech Real-Time
Innovations
TwinOaks Kongsberg
Computing
7

8. Multiple demo scenarios
! Discovery & Basic connectivity
! Request / Offered QoS (RELIABILITY, OWNERSHIP)
! Network Interruption
! Multiple Topics & Instances
! Exclusive Ownership
! Time and Content Filters
All this and more between multiple vendors
across different platforms!!
8

9. Demo Setup
DDS Three DDS Topics:
Global Data Space Square, Circle,
Triangle
DDS Data type:
Shape:
color : string
x : long
y : long
size : long
Color is instance Key
QoS:
Deadline, Liveliness
Reliability, Durability
History, Partition
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Ownership

10. 1. Discovery & Basic Connectivity
DDS
Global Data Space Each vendor publishes
one instance (color)
All vendors subscribe to
Square and receive
from everyone
You will see:
! Discovery
! Multi Platform
! Data Interoperability
10

11. 2. Request/Offered QoS (RELIABILITY)
Each vendor publishes one
DDS instance of each Topic
Global Data Space
Square RELIABLE
Circle BEST_EFFORT
Triangle BEST_EFFORT
Everybody Subscribes to
Square RELIABLE
Circle BEST_EFFORT
Triangle RELIABLE
You will see:
! Square MATCH
! Circle MATCH
11
! Triangle no MATCH

12. 3. Durability
All publish instance of
DDS • Square with DURABILITY
Global Data Space TRANSIENT_LOCAL,
HISTORY 100
Everybody else Subscribes
to Square
HISTORY 100
TRANSIENT_LOCAL
RELIABLE
You will see:
! Historical data for
TRANSIENT_LOCAL
12

13. 4. PARTITION QoS
Each vendor publishes one
DDS instance of Square, Circle,
Global Data Space and Triangle
Squares PARTITION “A”
Circles PARTITION “B”
Triangle PARTITION “*”
Everybody Subscribes to
Square, Circle, Triangle all
on PARTITION “A”
You will see:
! Square on ALL
! Circle on NONE
13
! Triangle on ALL

14. 5. OWNERSHIP
All vendors subscribe to
DDS Square
Global Data Space OWNERSHIP EXCLUSIVE
Each vendor successively
Publishes MAGENTA
Square EXCLUSIVE, each
with increasing size and
STRENGHT
You will see:
! Take over when
stronger writer appears
! Failover when stronger
writer goes away 14

15. 6. TIME_BASED Filter
Each vendor publishes
DDS
one instance (color) of
Global Data Space
Square and Circle
All vendors subscribe to
Square without FILTER
Circle with TIME_BASED
filter
You will see:
! All Square samples
! Sub-sampled Circle
15

16. 7. Content-Based Filter
Each vendor publishes
DDS
one instance (color) of
Global Data Space
Square
All vendors subscribe to
Square with
ContentBased Filter
You will see:
! Squares that pass
the filter
16

17. Interoperability demonstrated along many dimensions
Today we demonstrated interoperability between 5
vendors for:
! Discovery
! Different platforms (Windows, several Linux distros)
! Different Topics and Data-Types
! Different Qos (RELIABILITY, DURABILITY, OWNERSHIP)
! Unicast & Multicast, both reliable and best efforts
! One to Many and Many to one communications
! Time Based Filters
! Content Based Filter
17

18. Conclusions
! DDS Interoperability Works
 We will continue working on additional scenarios
 Vendors are committed to interoperability
 The DDS Standard and DDS-RTPS Interoperability
standards are complete and usable
! To-date 9 Vendors have demonstrated
interoperability:
! DDS is the only portable and interoperable
publish-subscribe infrastructure
Come see more at the booths! 18