[USRP-users] USRP N310 Losing Connection Occassionally

Austin Adam austinadam42 at gmail.com
Sat Nov 23 15:49:16 EST 2019


I am trying to run a Gnu Radio python file via the terminal and only want
to run in for a few seconds and then kill it. Then, wait a little bit, and
rerun the script again. My problem is that sometimes, when I rerun it, I
get an issue with my USRP N310 in that it decides to just disconnect with
either a "No devices found for" or "Someone tried to claim this device
again" message. I have posted the error messages below from two different
instances.

When this happens, running uhd_find_devices does not find the N310, neither
does uhd_find_devices --args=addr=192.168.10.2.

Upon restarting the N310 by manually pressing the power button, it is able
to be found by uhd_find_devices, and I can continue running the script
until the error happens, and I have to go manually restart the USRP.

I am trying to make an entire automated system and this is the one thing
that requires manual effort, which is to get up and restart the USRP.

I am looking for a way to either, reboot the USRP via commands for when the
error occurs, or a solution/workaround to the problem if it exists.

Is there any way to keep the USRP claimed and just tell the GNU part of the
script to run each time I want to rerun it? Because each time I have to run
the script, the USRP has to again be claimed and initiated. How can I keep
it on at all times, or just skip the claiming step each time?

Thank you in advance for any help you can provide!

Here are the error messages:
*[INFO] [UHD] linux; GNU C++ version 8.3.0; Boost_106700;
UHD_3.14.0.HEAD-0-g6875d061*















*Traceback (most recent call last):  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 296, in
<module>    main()  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 284, in main
tb = top_block_cls()  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 79, in __init__
  channels=range(4),  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line
122, in constructor_interceptor    return old_constructor(*args)  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line
2782, in make    return _uhd_swig.usrp_source_make(*args)RuntimeError:
LookupError: KeyError: No devices found for ----->Device Address:    addr:
192.168.10.2    rx_lo_source: external    init_cals:
BASIC|TX_ATTENUATION_DELAY|RX_GAIN_DELAY|PATH_DELAY|TX_LO_LEAKAGE_INTERNAL|LOOPBACK_RX_LO_DELAY*

*Here is the second time it happened:*














*[INFO] [UHD] linux; GNU C++ version 8.3.0; Boost_106700;
UHD_3.14.0.HEAD-0-g6875d061[INFO] [MPMD] Initializing 1 device(s) in
parallel with args:
mgmt_addr=192.168.10.2,type=n3xx,product=n310,serial=3177E63,claimed=True,addr=192.168.10.2,rx_lo_source=external,init_cals=BASIC|TX_ATTENUATION_DELAY|RX_GAIN_DELAY|PATH_DELAY|TX_LO_LEAKAGE_INTERNAL|LOOPBACK_RX_LO_DELAY[ERROR]
[RPC] Someone tried to claim this device again (From:
192.168.10.1)Traceback (most recent call last):  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 296, in
<module>    main()  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 284, in main
tb = top_block_cls()  File
"/home/ugikie/Desktop/PositionControl/ArrayTest2.py", line 79, in __init__
  channels=range(4),  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line
122, in constructor_interceptor    return old_constructor(*args)  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line
2782, in make    return _uhd_swig.usrp_source_make(*args)RuntimeError:
RuntimeError: Error during RPC call to `claim'. Error message: Someone
tried to claim this device again (From: 192.168.10.1)*
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