Controlling Wireless Sensor Networks

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Controlling Wireless Sensor Networks
Master Thesis

• Final Presentation
• Otmar Caduff
• October 5th 2006

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Wireless Sensor Networks

• A wireless sensor network (WSN) is a computer
  network consisting of spatially distributed
  autonomous devices using sensors to cooperatively
  monitor physical or environmental conditions at
  different locations.1

1source http//en.wikipedia.org/wiki/Wireless_sen
sor_network, retrieved october 4th 2006
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Problem

• Numerous devices in a network
• Devices perform complex tasks
• Debugging by LED
• Monitor application over some period of time

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Controlling Framework
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Communication
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Variable Introspection

• Reveal program state at runtime
• Implemented as RPC commands
• Peek return memory content of a given position
• Poke set memory content of a given position with
  a given value

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Logging

• Persistently log data to flash memory
• Minimize memory access (EEPROM technology)
• Space efficiency
• Multiple loggers
• Recovery
• Remote access
• Memory management

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Logging
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Topology Control

• Nodes regularly send beacon messages
• Beacon received ?neighbour alive!
• Keep neighbour table up to date
• Client reads out neighbour table

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Topology Control

• LTOP_Comm maintains black list
• Black list can be influenced from client

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Questions?
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Thanks!