[USRP-users] USRP N310 Losing Connection Occassionally

Austin Adam austinadam42 at gmail.com
Sat Nov 23 17:48:36 EST 2019


Hey Marcus,
Thank you for the quick response! This sounds like a good solution, could
you give some insight on how to go about doing it?

Thank you so much!

On Sat, Nov 23, 2019 at 2:32 PM Marcus D. Leech via USRP-users <
usrp-users at lists.ettus.com> wrote:

> On 11/23/2019 03:49 PM, Austin Adam via USRP-users wrote:
>
> 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)*
>
> i\
>
> Instead of interrupting the GR script, you could use the "Head" block to
> have it run for a finite number of samples, then exit gracefully.
>   When you interrupt it, some things are clearly not getting cleaned up
> gracefully.
>
>
>
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