Some possible problems you may want to explore:

- Links not correctly established (The file, topo.txt, really
shouldn't have duplicates)
  Test: Verify correct links established

- Links added, but not above noise threshold
  Test: Verify correct links established

- Too much noise / never clear channel
  Test:
Monitor the "CpmModelC" channel. CpmModelC will output messages like:
"Checking clear channel @ %s: X <= Y"
If X >= Y then the packet will NOT be transmitted and the radio may
"hang" waiting for a free channel.

- Of course, verify TinyOS logic is correct (report errors, use dbg
judiciously, etc.)

HTH,
Paul
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