Make update rate configurable

trackDoppler

@@ -9,12 +9,13 @@ from camrasdevices import LocalOscillator
 def main():
     parser = argparse.ArgumentParser(description = "Adjust the frequency of the local oscillator to Doppler track a frequency at the pointing of the telescope")
     parser.add_argument("-f", "--frequency", help="Frequency to track, default is HI frequency at {}".format(track_doppler.freq_hi), default=track_doppler.freq_hi, type=float)
+    parser.add_argument("-u", "--updaterate", help="Update rate in seconds, default is 0.5", type=float, default=0.5)
 
     args = parser.parse_args()
 
     dt = telescope()
     lo = LocalOscillator()
-    track_doppler.track_doppler(dt, lo, tracking_frequency=args.frequency)
+    track_doppler.track_doppler(dt, lo, tracking_frequency=args.frequency, timeout=args.updaterate)
 
 if __name__ == '__main__':
     main()