[Discuss-gnuradio] Help required for tunnel.py with two USRPs

[Henning Bredenberg]

Hi all,

I'm trying to simulate a communication system with GNU-Radio. First of  
all, i have to check if "tunnel.py" is still up to date in my version  
of GNU-Radio. The Aim is to use a TAP-device for the simulation of  
sending and receiving data.
After connecting two USRP B200 via USB to the pc, the command
"sudo python tunnel.py -f 560e6 -r 0.1e6 --rx-gain=20 --tx-gain=20 -m  
gmsk -p 2 --omega-relative-limit=0.00 5 --gain-mu=0.175 --mu=0.5"
is given for some exemplarily parameters. The response
"linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.005.005-0-unknown"
makes me asking, why the UHD is "unknown" (uhd_find_device shows the  
two USRP connected). Adding the Address (-a serial=F5EA56) leads to
"RuntimeError: LookupError: KeyError: No devices found for ----->
Device Address:
    serial: F5EA5"
How can i fix that? Maybe there is another option to check if  
"tunnel.py" is still up to date (or maybe u got some generally advices)?

The second step should be to give the TAP-device an address (sudo  
ifconfig gr0 ...), what shouldn't be a problem then.
I'm a bloody beginner, so please be lenient. Thanks!

best regards,
Henning