Hi Marcus,

>The "master_clock_rate" specification is *per session*.   It does NOT set it 
>in any persistent way.  
> In the next session, if you don't specify it, UHD will pick an appropriate
> clock value.  If this is NOT happening, then that is a bug or an 
> under-documented feature.

Sorry for the basic question, but what is a "session"? How do I end one and 
start a new one within a single execution of a program?

If I just try to re-make the device, I get an exception. Eg:

                m_dev = uhd::usrp::multi_usrp::make(device_args);
                m_dev->set_master_clock_rate(61.44e6);
               // How to restart a session here?
                m_dev = uhd::usrp::multi_usrp::make(device_args);

...
[INFO] [B200] Asking for clock rate 61.440000 MHz...
[INFO] [B200] Actually got clock rate 61.440000 MHz.
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[ERROR] [UHD] Exception caught in safe-call.
  in b200_radio_ctrl_core_impl::~b200_radio_ctrl_core_impl
  at 
C:\Users\buildbot\worker0\Builder_uhdPackage_Windows_x64_vs2019\work\uhd\host\lib\usrp\b200\b200_radio_ctrl_core.cpp:68
this->peek32(0); _async_task.reset(); -> AssertionError: accum_timeout < 
_timeout
  in b200_radio_ctrl_core_impl::wait_for_ack
  at 
C:\Users\buildbot\worker0\Builder_uhdPackage_Windows_x64_vs2019\work\uhd\host\lib\usrp\b200\b200_radio_ctrl_core.cpp:227

Probably something trivial, but I can't see it in the docs. No close/release 
method I can see.

Thanks,
Jon

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