[ns] Bug in 802.15.4?

[Cesare M. Carretti]

Hello all,
I am implementing a distributed algorithm for sensor network, and I wrote
an application and a transport protocol simil-UDP to send data.
I have a strange problem in my simulation:
at some point, one node stop to send packet, it is blocked and if I try to
force the queue to send packet, I have a task overflow error from mac
layer.
I still do not know why this thing happen at some point, I am trying to do
some debugging, maybe for some collision. Anyway I think this is not
normal, because it should never happen that a node stop sending data (it
continues to receive) at all forever, it should maybe reset itself if
there is some problem. Maybe it is waiting for something?
My application works very well over 802.11, so I think it should be the
same with 802.15.4 (of course with a different output, number of packet
etc).
However it shouldn't stop!

What do you think?

best regards

Cesare Carretti

[ns] Classifier::no-slot{} execution and simulation terminates with exit code 1

[Ramzi Tka]

Hi all,
I'm running wired-cum-wireless simulation .
When I decrease the mean interval time between connections so i increase
connection number, I got an execution of the default classifier no-slot{}
routine which terminates the simulation with exit code 1.

--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
...
...
with a time-spaced and relatively small number of connections , evry
thing woks properly.

Also, The use of any debugger isn't of a great help since it's a tcl
code execution and the program terminates.

do you have any idea about the origin of such problem.
thanks in advance
regards,
ramzi