Sympathy for the WSN Debugger

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Sympathy for the WSN Debugger

• E.g. Sympathy detected
• Routing loop caused by bug in routing layer
• Congestion caused by dense neighborhoods
• Hard to track down without added visibility

• Debugging is challenging due to minimal
  resources, limited visibility, application
  behavior changes after deployment
• Sympathy is deployed at James Reserve, and has
• Identified numerous subtle failures
• Aided in determining their source

Collect Metrics
How It Works

• Nodes periodically send selected metrics to a
  sink
• Sink identifies failures in data throughput, and
• Analyzes the metrics to determine the cause for
  data interruption