wireless embedded systems (0120442x) sensor network programming and motelib simulator

Network Kernel Architectures and Implementation

(01204423)

Sensor Network Programmingand MoteLib Simulator

Chaiporn Jaikaeochaiporn.j@ku.ac.th

Department of Computer EngineeringKasetsart University

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Outline Network programming with MoteLib MoteSim – MoteLib's Simulator

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Mote and Network Emulator

Virtual Mote

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Mote and Network Simulation Motes are modeled with standard C

program Exact same code as used for the actual

hardware Network is modeled with Python

programfrom motesim import Simulator, Mote

MOTEAPP = 'build/sim/count-radio.elf'sim = Simulator()sim.addNode(Mote(MOTEAPP), (100,100))sim.addNode(Mote(MOTEAPP), (200,100))sim.run()

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Creating Executable for Simulator Executable for simulator can be built

by running

Executable will be stored under build/sim directory

make PLATFORM=sim

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Modeling Network Network is modeled with Python Make sure the following directories are

part of PYTHONPATH

Try the following program sim-blink.py Can be found in examples/ directory

$MOTELIB_DIR/platforms/sim/python$MOTELIB_DIR/lib/python

from motesim import Simulator, Mote

sim = Simulator()sim.addNode(Mote('build/sim/blink.elf'), (100,100))sim.addNode(Mote('build/sim/blink.elf'), (200,100))sim.run()

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Virtual Mote Creation Virtual mote object can be

instantiated from class Mote Each virtual mote instance must be

added to the simulation using addNode methodfrom motesim import Simulator, Mote

sim = Simulator()m1 = Mote('build/sim/blink.elf')m2 = Mote('build/sim/count.elf')sim.addNode(m1, (100,100))sim.addNode(m2, (200,100))sim.run()

Create a mote running 'blink' app

Create a mote running 'count' app

Add m2 to the simulationat position (200,100)

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Enabling Python Console

IPython is recommended for better interaction

from motesim import Simulator, Mote

sim = Simulator()sim.addNode(Mote('build/sim/blink.elf'), (100,100))sim.addNode(Mote('build/sim/blink.elf'), (200,100))sim.run(script=sim.console)

$ sudo apt-get install ipython

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Accessing Node Objects Node objects are stored in the node

list inside sim object>>> n = sim.nodes[2]>>> dir(n)

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Turning Node On and Off Node can be turned off using

shutdown() method boot() method turns node back on

>>> sim.nodes[3].shutdown()>>> sim.nodes[3].boot()

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Emulating Button Button pressing can be emulated by

two methods: pressButton() releaseButton()

>>> n = sim.nodes[3]>>> n.pressButton()>>> n.releaseButton()

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Emulating UART Node's UART interface can be

emulated via TCP socket Not activated by default Use activateSocket() inside node's uart object to activate

>>> n = sim.nodes[3]>>> n.uart.activateSocket()('0.0.0.0', 32345)>>>

Listening port

$ telnet localhost 57597Trying 0.0.0.0...Connected to 0.Escape character is '^]'.^]

telnet> mode c

switch to character mode

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Exercise: Voting Machine Reimplement the wireless voting

application Allow user to cast a vote using the USER

button Voting choices are: Red (1), Yellow (2),

Green (3), or No Vote (0) When the USER button is pressed,

Set LED status accordingly Report current vote to the base station (#0)

with message type 50 Integrate base station functionality into

your app

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Exercise (cont'd) Create a virtual network with 5

nodes Activate UART at base station (node

#0) Telnet to the open port Emulate button pressing at other nodes