Timeout waiting for PVs to update in estimate_band_phase_delay

Timeout errors seem to happen more in band_phase_delay estimation than other pysmurf functions. Here's the full stack trace:

ExceptionTraceback (most recent call last)
<ipython-input-11-b37ac59628f4> in <module>
      1 for band in tqdm(bands):
      2     S.set_att_dc(band, 30)
----> 3     S.estimate_phase_delay(band)

/usr/local/src/pysmurf/python/pysmurf/client/util/pub.py in wrapper(S, pub_action, *args, **kwargs)
     48                     S.pub._action_ts = S.get_timestamp()
     49 
---> 50                 rv = func(S, *args, **kwargs)
     51 
     52             finally:

/usr/local/src/pysmurf/python/pysmurf/client/util/smurf_util.py in estimate_phase_delay(self, band, nsamp, make_plot, show_plot, save_plot, save_data, n_scan, timestamp, uc_att, dc_att, freq_min, freq_max)
    290         freq_cable, resp_cable = self.full_band_resp(
    291             band, nsamp=nsamp, make_plot=make_plot,
--> 292             save_data=save_data, n_scan=n_scan)
    293 
    294         idx_cable = np.where( (freq_cable > freq_min) & (freq_cable < freq_max) )

/usr/local/src/pysmurf/python/pysmurf/client/util/pub.py in wrapper(S, pub_action, *args, **kwargs)
     48                     S.pub._action_ts = S.get_timestamp()
     49 
---> 50                 rv = func(S, *args, **kwargs)
     51 
     52             finally:

/usr/local/src/pysmurf/python/pysmurf/client/tune/smurf_tune.py in full_band_resp(self, band, n_scan, nsamp, make_plot, save_plot, show_plot, save_data, timestamp, save_raw_data, correct_att, swap, hw_trigger, write_log, return_plot_path, check_if_adc_is_saturated)
    643             #If ADC is saturated, throws an exception.
    644             if check_if_adc_is_saturated:
--> 645                 adc_is_saturated = self.check_adc_saturation(band)
    646                 if adc_is_saturated:
    647                     raise ValueError('Playing the noise file saturates the '+

/usr/local/src/pysmurf/python/pysmurf/client/util/pub.py in wrapper(S, pub_action, *args, **kwargs)
     48                     S.pub._action_ts = S.get_timestamp()
     49 
---> 50                 rv = func(S, *args, **kwargs)
     51 
     52             finally:

/usr/local/src/pysmurf/python/pysmurf/client/util/smurf_util.py in check_adc_saturation(self, band)
   1467         """
   1468         adc = self.read_adc_data(band, data_length=2**12, make_plot=False,
-> 1469                   save_data=False, show_plot=False, save_plot=False)
   1470         adc_max   = int(np.max((adc.real.max(), adc.imag.max())))
   1471         adc_min   = int(np.min((adc.real.min(), adc.imag.min())))

/usr/local/src/pysmurf/python/pysmurf/client/util/pub.py in wrapper(S, pub_action, *args, **kwargs)
     48                     S.pub._action_ts = S.get_timestamp()
     49 
---> 50                 rv = func(S, *args, **kwargs)
     51 
     52             finally:

/usr/local/src/pysmurf/python/pysmurf/client/util/smurf_util.py in read_adc_data(self, band, data_length, hw_trigger, make_plot, save_data, timestamp, show_plot, save_plot, plot_ylimits)
   1553 
   1554         res = self.read_stream_data_daq(data_length, bay=bay,
-> 1555             hw_trigger=hw_trigger)
   1556         dat = res[1] + 1.j * res[0]
   1557 

/usr/local/src/pysmurf/python/pysmurf/client/util/pub.py in wrapper(S, pub_action, *args, **kwargs)
     48                     S.pub._action_ts = S.get_timestamp()
     49 
---> 50                 rv = func(S, *args, **kwargs)
     51 
     52             finally:

/usr/local/src/pysmurf/python/pysmurf/client/util/smurf_util.py in read_stream_data_daq(self, data_length, bay, hw_trigger, write_log)
   1442 
   1443         time.sleep(.1)
-> 1444         sg.wait()
   1445 
   1446         vals = sg.get_values()

/usr/local/src/pysmurf/python/pysmurf/client/command/sync_group.py in wait(self, epics_poll)
     67                 time.sleep(.001)
     68             if time.time() - t0 > self.timeout:
---> 69                 raise Exception('Timeout waiting for PVs to update.')

Exception: Timeout waiting for PVs to update.

Start with estimate_phase_delay and full_band_resp in python/pysmurf/client/util/smurf_util.py, then trace check_adc_saturation, read_adc_data, and read_stream_data_daq to sync_group.py's wait method. Reproduce the reported Timeout waiting for PVs to update error and determine the cause of the timeout during phase-delay estimation; done means the operation completes reliably or fails with a clear, appropriate error.