I would like to simulate mobility in some nodes and I have seen some
references indicate that this is not feasible without modifying TOSSIM. I
cannot find any source code for these modifications, so I just attempted to
change gain values in the middle of my simulation at set times in order to
simulate mobility. Is there any reason why this would not work? When I
tried this, it seems to work.

Just for reference, here is the code snippet:
*************************************************
while (t.time() / t.ticksPerSecond() < 45):
  t.runNextEvent()

#this should break contact between nodes 2 and 3
r.add(2,3,-130)
r.add(3,2,-130)

while (t.time() / t.ticksPerSecond() < 90):
  t.runNextEvent()

#this should re-establish contact between nodes 2 and 3
r.add(2,3,-70)
r.add(3,2,-70)

while (t.time() / t.ticksPerSecond() < 130):
  t.runNextEvent()
**************************************************************

Best,
-AR
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