MobileMAN Kickoff1 Prototype Development Kit & P2P Middleware Proposal Giovanni Turi IIT - CNR Pisa [email protected].

MobileMAN Kickoff 1

Prototype Development Kit &

P2P MiddlewareProposal

Giovanni Turi

IIT - CNR [email protected]

MobileMAN Kickoff 2

Agenda IntroductionThe need for a “PDK”

(Prototype Development Kit)JXTA, a middleware for p2p networkingConclusions

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IntroductionMobileMAN has objectives at all levelsDemonstrations play an important role:

For single modules For the “fully functional”, integrated system

Demonstrate through usage of new/ported “killer” applications

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The need for a PDK – (1)Few and unusable examples of ad hoc

networksThere is the need for a Prototype

Development Kit (PDK)A PDK intended as a set of devices and

tools to modify, build and test ad hoc software

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The need for a PDK – (2) Use the PDK to:

Gain experience with the new technologies Develop step-by-step prototypes Do real experiments Have more feedback to our “paper work”

Extend the PDK scope to all project members: Share everybody’s expertise Have a common testbed for coherent results

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The need for a PDK – (3)Target to set up an ad hoc network

from (possibly) dishomogeneous nodes

Fix the application layer with a reference middleware (MW)

Play inside and below the MW

MiddlewareTransportRoutingMAC…

Application

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The need for a PDK – (4) What kind of devices and tools can we use?

HW: laptops, PDA’s, MeshAP… OS: Linux for sure! But MS Windows XX? Wireless Devices: IEEE 802.11x, Bluetooth Tools: C/C++ (gcc), Java (JDK)

…but one reference MW: Currently investigating on JXTA

Applications?

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JXTA

A middleware for p2p computing

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JXTA – Intro (1)

Pronounced as “juxta” (from “juxtaposition”) P2p computing side-by-side with client/server Set of open, generalized p2p protocols

To do what?

To build distributed applications able to communicate and collaborate on the network in a p2p fashion

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JXTA – Intro (2)

JXTA protocols are designed to deliver: Interoperability, peers locate and communicate

with each other Platform independence, from the HW, from the

programming language (see “binding”), from the transport protocol, (TCP/IP, Bluetooth, HomePNA)

Ubiquity, JXTA technology designed to be accessible by any digital device

...sounds interesting for “ad hoc”...

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JXTA – Intro (3)And more for p2p nets JXTA delivers:

Uniform decentralized addressing scheme Network virtualization Fault resiliency Dynamic self-organization

...even more interesting for “ad hoc”!See later more specific slides…

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JXTA – mechanisms

What can JXTA-based peers do? Discover each other Self-organize into peer groups Advertise and discover network services Communicate with each other (even in a

secure way SSL/TCL) Monitor each other

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JXTA – architectureThree foundamental layers

Applications

Services

Core

Some community p2p application

Applications and services are not rigidly separeted…

p2p networking primitives: pipes, peer groups, monitoring, security

Basic p2p services: search and index, file sharing, DFS, PKI…

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JXTA - components Network is composed by peers Peers can group up, forming peer groups Peers can notify offered services through

advertisements (XML docs or Binaries) Peers communicate using pipes, exchanging

messages (XML docs) Pipes, with asynchronous and unidirectional

communication (1:1, 1:N)

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JXTA - protocols Peer Discovery, peers advertise and discover offered

resources Peer Information, peers obtain other peers status

information Peer Resolver, peers define and exchange

information in a query/response model Pipe Binding, peers establish virtual communication

channels Endpoint Routing, route discovery…similar to DSR,

but with peer hierarchy Rendezvous, message propagation within a group

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JXTA – key aspects (1)Data standardization, use of XML docs

to share information among peersUniform addressing scheme, use

Uniform Resource Names (URNs) to identify any resource (peers, groups, pipes…), NO central authority like DNS Example ID: urn:jxta:uuid 5987678577…..87DA4F688

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JXTA – key aspects (2) Network virtualization and fault resiliency,

network topology is abstracted, use of independent routing protocol (ERP), reroute on the fly as peers come and go, replicate services within groups

Dynamic self-organization, A peer locates other peers and groups, agrees on

groups’ services, implements them and joins A group maintains advertisements for its

members, eventually authenticate members

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JXTA - conclusions JXTA sounds appealing for our experiments At least the concepts inside are close enough

to ad hoc concepts We can open the box and provide our own ad

hoc services Routing: DSR, AODV Transport: TCP, HTTP, Bluetooth Monitoring: check other peers behavior ….and so on

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JXTA – problems Sun supports a JAVA binding, and JAVA is

perfect for fast application development, but…

Is it light enough for small devices? How can we work around “SW-elefants”?

Do our own binding, maybe using the JAVA Native Interface

Use variants like JXME on small boxes

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JXME JXTA for JAVA Micro Edition Suitable for small devices with low

capabilities Mixed architecture: JXME on edge peers +

JXTA with relay service on normal peers                                                                                 

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JXME – features supportedDiscovery of pipes, peers and groupsCreation of pipes and groupsGroup joinCommunication through pipes

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JXME – constraintsNo security (no SSL)Limited architecture and run time

support resourcesLimited networking only HTTPNo XML (parsers are really really

heavy!)

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JXME – the relaysRelay peers will offer:

Compact Advertisement XML binary translation Proxy for small Mobile Information

Device Profile (MIDP) devices

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References and questions JXTA project:

http://www.jxta.org/

JXME project:

http://jxme.jxta.org/

URNs:

IETF RFC 2141