Dear all,
I'm a thesis student in my final year of university.
My thesis mainly is about WSN and energy harvesting.
I've implemented a test-application on the testbed of the university.
The application is quite simple:
About 40 motes send requests to a central controller-mote.
This happens at random times in each one-second-interval.
The controller sends replies back 200ms after receiving the requests.
There are some buffers to be able to handle big request-bursts.
Since I want to test energy harvesting on this application, it is quite
crucial that I can turn the radio on and off to save energy.
To turn the radio off I currently defined a task:
task void disableRadio()
{
if(call AMRadioControl.stop() != SUCCESS){
post disableRadio();
}
}
AMRadioControl wires splitcontrol to ActiveMessageC.
A similar task is used to enable the radio.
The same approach is used in the LPL-implementation from TinyOS.
I tested this in a dummy application where I just put the radio on and off
every 100 ms.
This dummy-application works just fine, I can measure the energy-use of
the motes and the results show a square-signal with the 100 ms period,
so the radio is correctly turned on and off.
However when I use this in my star-topology application above, the application
stops running.
The tasks are posted for example: after a message is send and senddone
is signalled (radio off), after a 200ms timer expires (radio back on), when the
reply is received (radio off).
In my application there is a counter. Normally the application would
have to run for 100 cycles, but already after the first cycle the
program stops working (it works correctly when the state of the radio
is not changed).
What could be the cause of this behaviour and how can I find out? My mentor also
has not found the answer to this and I've been looking for this for a
while.
This is the only place I can ask my question, so any help would be greatly
appreciated.
Kind regards and thanks in advance!
Ruben
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