Ad hoc social mediaAdrian Holzer

Currently cloud based social media

Cloud brings privacy concerns

Wearables will increase the amount of data

Cloud brings connectivity concerns

Increase in the number of NGOs

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Is there a way to replace this dark cloud?

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Ad hoc social media should be explored

But today there are almost no ad hoc social media apps

Why?

There is a lack of development support

We want to address this by providing server-less communication APIs and trustful UI guidelines

API UI

API

Today we’ll look at existing work on ad hoc infrastructure

Publish subscribe can be a good start

Anonymous messaging

Asynchronous messaging

Subscribers

C

Publisher

CC

A

B

C

CD

Match!

Basic publish / subscribe

Different publish / subscribe flavors exist with some context awareness

CP CS

Pubs are restricted to a defined Space

Publication Space

Match when:S in the Publication space

STEAM

CP CS

Content Match

Location Match

CP CS

Pubs and Subs are restricted to a defined Space

Publication Space Subscription Space

LPSS

Match when:P in Sub Space and S in Pub Space

CS

Content Match

Location Match

CP

CP CS

Context of Relevance

Context of Interest

Subscription Space

Publication Space

CPS

Match when:P in Sub Space and S in Pub Space

and both contexts overlap

CS

Content Match

Context Overlap

CP

Pub Space Match

Sub Space Match

CP DPSS CS

Sub ScopePub Scope

Dynamic Content Dynamic Filters

Match when:P in Sub Scope and S in Pub Scope Each time filter or message changes

CSCP

Content Match

Pub Space Match

Sub Space Match

[10] Yann Busnel, Nuno Cruz, Denis Gillet, Adrian Holzer, Hugo Miranda. “Reinventing Mobile Community Computing and Communication”. In the proceedings of IEEE IUCC'13. July 2013.[9] Adrian Holzer, François Vessaz, Benoît Garbinato. “ Middleware for Location Privacy: an Overview”. In the proceedings of ACM Research in Applied Computation Symposium (RACS’12). October 2012.

[8] Adrian Holzer, Lukasz Ziarek, K.R. Jayaram, Patrick Eugster, “Abstracting Context in Event-based Software”. In Transactions on Aspect-oriented Software Development (TAOSD). 9: 123-167. 2012.

[7] Patrick Eugster, Benoît Garbinato, Adrian Holzer. “Pervaho: a specialized Middleware for Mobile Context-aware Applications”. In Electronic Commerce Research Journal, 2009. Springer. [6] Adrian Holzer, Lukasz Ziarek, KR Jayaram, Patrick Eugster . “Putting Events in Context”. In the proceedings of the International Conference on Aspect-Oriented Software Development (AOSD’11). March 2011, pp.241-252.[5] Adrian Holzer, Saida Maaroufi, Samuel Pierre. “DYMES: a Dynamic Messaging Service for VANETs”. In the proceedings of the 6th IEEE International Conference on Wireless and Mobile Communications (WiMob’10). October 2010, pp.513-520. [4] Patrick Eugster, Benoît Garbinato, Adrian Holzer. “Middleware Support for Context-aware Applications”.  Chapter 14 of Middleware for Network Eccentric and Mobile Applications, 2009. pp. 305-322. Springer. [3] Patrick Eugster, Benoît Garbinato, Adrian Holzer. “Design and Implementation of the Pervaho Middleware for Mobile Context-aware Applications”. In proceedings of the 3rd IEEE International Montreal Conference on e-Technologies (MCETECH'08), 2008[2] Patrick Eugster, Benoît Garbinato, Adrian Holzer. “Pervaho: A Development and Test Platform for Mobile Ad hoc Applications”. In proceedings of the 3rd ACM Annual International Conference on Mobile and Ubiquitous Systems: Networks and Services (Mobiquitous'06), 2006.[1] Patrick Eugster, Benoît Garbinato, Adrian Holzer. “Location-based Publish/Subscribe”. In proceedings of the 4th IEEE International Symposium on Network Computing and Applications (NCA'05), 07-2005.

middleware references

How are publish / subscribe systems implemented?

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Unicast Multicast

Anycast Broadcast

They typically rely on some low level messaging protocols

Rule #1 All neighbors

hear a transmission

Devices must communicate directly Rule #2

Retransmissionsnecessary to reach further

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Existing algorithms

an analogy...

Broadcast

spread some gossip

To everyone

Only voice communication is allowed

Flooding

repeat a rumor once

C CC CCCC C

Message overload

Beware of broadcast storm

Can we do better?

Retransmit the message if no one did it before

Listen for retransmissions

Wait when a message is received before retransmitting

CBS

Wait a random time

C CC CCC

CC12 3

221 2

11- 1-

PAMPA

Wait time proportional to sender proximity

C CC C

CCC

32 2 1

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21 1

![9] Adrian Holzer, Patrick Eugster, Benoît Garbinato. “Evaluating Implemetation Strategies for Location-based Multicast Addressing”. In IEEE Transactions on Mobile Computing (TMC). 12(5), 2013.[8] Adrian Holzer, Patrick Eugster, Benoît Garbinato, “ALPS - Adaptive Location-based Publish/Subscribe”. In Computer Networks (COMNET) 56(12): 2949-2962. 2012.

[7] François Vessaz, Benoît Garbinato, Arielle Moro, Adrian Holzer. “Developing, Deploying and Evaluating Protocols with ManetLab”. In the proceedings of NETYS'13. May 2013.[6] Behnaz Bostanipour, Benoît Garbinato, Adrian Holzer, “Spotcast – A Communication Abstraction for Proximity-Based Mobile Applications”. In proceedings of the 11th IEEE International Symposium on Network Computing and Applications (NCA’12), 2012.

[5] Benoît Garbinato, Adrian Holzer, François Vessaz. “Context-aware Broadcasting Approaches in Mobile Ad hoc Networks”. In Computer Networks (COMNET). Volume 54, Issue 7, May 2010, pp. 1210-1228. Elsevier.[4] Adrian Holzer, Saida Maaroufi, Samuel Pierre. “BROADTRIP: Broadcast for Transit in Platoons”. In the proceedings of the 7th IEEE International Conference on Wireless and Mobile Communications (WiMob’11). October 2011. [3] Adrian Holzer, François Vessaz, Samuel Pierre, Benoît Garbinato. “ PLAN-B: Proximity-based Lightweight Adaptive Network Broadcasting”. In the proceedings of the 9th IEEE Symposium on Network Computing and Applications (NCA’11) August 2011.[2] Benoît Garbinato, Adrian Holzer, François Vessaz. “Six-Shot Multicast: A Location-Aware Strategy for Efficient Message Routing in MANETs”. In the proceedings of the 9th IEEE Symposium on Network Computing and Applications (NCA’10) July 2010 pp.1-9. [Best Student Paper Award]. [1] Benoît Garbinato, Adrian Holzer, François Vessaz. “Six-shot Broadcast: a context-aware algorithm for efficient message diffusion in MANETs”. In proceedings of the 10th LNCS International Symposium on Distributed Objects, Middleware, Applications (DOA'08). Springer, pp. pp. 625-638, 2008.

protocol references

How can trust and privacy components can be integrated in the design of context-aware middleware APIs?

What is the adequate way to express data / peer aggregation in a high level communication API ?

What implementation strategies should be followed to provide privacy by design for such middleware?

UI

Today we’ll look at existing work on ad hoc infrastructure