Re[Discuss-gnuradio] configuring flow graph

[mehdimolu]

I want to implement MIMO using gnuradio.
I already could do differential and coherent(BPSK) communication link
between two USRPs( daughter board Flex 2400 ).
right now for channel estimation in MIMO  I need to do reconfigure flow
graph. As mentioned in 
           www.gnuradio.org/trac/wiki/Tutorials/WritePythonApplications
after fg.stop() I call fg.wait() and then reconfigure flow graph, as bellow
                        ...
                        fg.stop()
                        fg.wait()               #reconfigure flow graph
                        print "hello"
                        fg.disconnect(fg.amp, fg.u)
                        self.subdev[0].set_enable(False)
                        self.subdev[1].set_enable(True)
                        fg.connect(fg.amp, fg.u)
                        fg.start()  
                        ...
but code waits in gt.wait() and never goes ahead(never prints "hello").
what shall I do to fix it?
thanks,
Mehdi 
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