Hi:
 
Lately, I have tried to modify tunnel.py to switch freq in the middle of packet 
transmitting. But I have two problems.

1. When I tried to switch freq in the same daughterboard, should I have to stop 
the original transmission thread(tb.start) and start a new thread with new 
freq? Or are there any way to change the setting without stop the original 
thread?
2. Also, I wanna switch freq between different daughterboards, e.g., switching 
between 400MHz and 2.4GHz. How should I do? I first tried to assign a string 
"B" to "options.tx_subdev_spec", but it turns out not a string format. If we 
don't assign the value to this options, how could we do to switch different 
daughterboard?

Thanks in advance!
KC
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