[Tinyos-help] collision in TOSSIM

[salvatore galati]

Hi all.
I'm a student of University of Pisa and i'm working on WSN with TinyOs 2.x
and telosB motes.

In my application the first mote ( mote A ) sends messages back-to-back to a
second mote ( mote B ).
Mote B has a timer and when the timer expires it sends an aknowledgment to
mote A, this message can arrive to mote A when it is sending a message to
mote B
 or when mote A is waiting for intial backoff or congestion backoff --->so
in the first case , there will be a collision between messages.

I have simulated this behaviour in TOSSIM , but i find that there is NO
collisions between messages sent by mote B and messages sent by mote A,
so i think that in TOSSIM the event "receive message" ( in mote A ) is
scheduled after the task "send message" ( in mote A ) ----> so there will
never be collision...

I'm correct or TOSSIM can simulate collision between messages?
anyone has tested a situation in which there can be collision between
messages in TOSSIM ?
Is there any way to simulate collision in TOSSIM?

Please anyone can answer me a
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