Nice idea, but I tried switching the motes and nothing changes.
I kept the source code for the listening mote extremely simple, I think 
the problem lies with one of the sending motes.

> Just an idea: maybe the third mote has some low-power radio 
> implementation (low-power listening, LPL) enabled and the sending 
> motes somehow do not take this into account (i.e., they do not send a 
> long-enough preamble).
>
> Cheers,
> Urs
>
>
> On 10/29/10 3:28 PM, Simon Eberz wrote:
>> According to the TinyOS wiki the CC2420 radio stack, which is used by
>> the MICAz motes, performs a CCA by default, this should not be the 
>> problem.
>> Furthermore, not a single one out of the ~300 packets was received by
>> the third mote, but all were received by the second one. I don't think
>> the problem is interference or something similiar.
>
>

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