22-03-25 1 • These materials are prepared only for the students enrolled in the course Distributed Software Development (DSD) at the Department of Computer Science and Engineering, University of Mälardalen, Västerås, Sweden and at the Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia (year 2003/2004). • For all other purposes, authors’ written permission is needed! • The purpose of these materials is to help students in better understanding of lectures in DSD and not their replacement! NOTICE!
Transcript
23-04-19 1
• These materials are prepared only for the students enrolled in
the course Distributed Software Development (DSD) at the
Department of Computer Science and Engineering,
University of Mälardalen, Västerås, Sweden and at the Faculty
of Electrical Engineering and Computing, University of Zagreb,
Croatia (year 2003/2004).
• For all other purposes, authors’ written permission is needed!
• The purpose of these materials is to help students in better
understanding of lectures in DSD and not their replacement!
NOTICE!
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Selected Topics in Software Engineering -
Distributed Software Development
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The Interactive Museum Team Presents:
Interactive Museum
Project Current state
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• Introduction
• Current status for :– Mote network– Main Application– PDA Application– Web Application– Database
• Project status update
What we will talk about?
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Mote network
• Main concern: control of the radio range– Dynamic motes: small (0.5 m – 4 m) range
• How to achieve such small range?
– Static & base: large ( > 30 m)
• Solution: abilitiy to control mica2 RF Transciever
• Test results: minimal ranges– 0.4 – 0.5 m– 3.3 – 3.9 m
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Mote network modeling
• UML is inadequate
• Each object in mote network is microcontroller based computer– Preemption (non-deterministic state switching,
even when in transition between states)– composite states modeling
• Single mote can be in one or more states at a time• Whole mote network also • State of all motes determines state of network
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Mote network modeling
– Overall concurrency / independent execution of every network entity
• Radio communication between motes is lossy by nature
• Solution for model representation:
Petri Nets
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Mote network as Petri net
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Mote network - status
• Current state:– Prototype of dynamic mote– Static mote prototype– Base mote (GenericBase from TinyOS library)– First functional version of mote network to
application bridge (for C#)
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• Pocket PC Emulator– Simulates the PDA through VS 2005– Works perfect with the PDA Application
PDA Application
• PDA Device– Upgraded to .NET Compact Framework 2.0– Working WiFi connection using WPA-PSK
with TKIP encryption– The PDA Application works perfect
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PDA Application
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• PDA Application Connections– Connects to a PDA Server (Windows Service)– Interacts with a Web Service– (Maybe video streaming in the future)
• PDA Application Functionalities– Bookmarks– History– Text/Image and maybe video
PDA Application
PDA Server
• Windows Service
• Functionalities– Identify visitor PDA to inform of available
exhibit information
• Communication– Connects to PDA through TCP/IP streams– Connects to database through Web Services– Messages from Mote Server by RPC
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PDA Server – Example
• Message recieved when a visitor reaches the proximity of an exhibit
• Dynamic Mote ID and Static Mote ID
• Consults the database
• Alerts the PDA of available information on the viewed exhibit
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Web Service
• Database Requests– Supply the interaction with the actual
database– The central point of data communication (will
be used by the main application, Web application and the PDA)
• Response type– From the beginning we had objects, now
